Heatcraft Refrigeration Products Humidifier H IM CU User Manual

Installation and  
Operations Manual  
H-IM-CU  
August 2008  
Part No. 25008101  
Replaces None. Information formerly included in H-IM-64L.  
Condensing  
Units  
Table of Contents  
General Safety Information...............................................................................2  
Inspection ...............................................................................................................2  
Warranty Statement ............................................................................................2  
Space and Location Requirements ...............................................................3  
Remote and Water Cooled Condensing Units Requirements..............4  
City & Tower Water Connections.....................................................................4  
Condensing Unit Rigging and Mounting ....................................................5  
Head Pressure Control........................................................................................6  
Refrigerant Oils......................................................................................................7  
Phase Loss Monitor..............................................................................................8  
Recommended Refrigerant Piping Practices .............................................8  
Refrigeration Pipe Supports ............................................................................8  
Suction Lines..........................................................................................................8  
Liquid Lines ............................................................................................................9  
Hot Gas Defrost Systems ...................................................................................9  
Unit Cooler Piping............................................................................................. 10  
Line Sizing Tables ........................................................................................10-13  
Evacuation and Leak Detection ................................................................... 14  
Refrigerant Charging Instructions............................................................... 14  
Field Wiring.......................................................................................................... 14  
Check Out and Start Up .................................................................................. 15  
Operational Check Out.................................................................................... 16  
System Balancing - Compressor Superheat............................................. 16  
General Sequence of Operation .................................................................. 17  
Electric Defrost Troubleshooting................................................................. 17  
System Troubleshooting Guide.................................................................... 18  
Preventive Maintenance Guidelines........................................................... 19  
Typical Wiring Diagrams ...........................................................................20-23  
InterLink™ Replacement Parts ...................................................................... 24  
H-IM-CU-0808 | Version 000  
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Space and Location Requirements for  
Air Cooled Condensing Units and Remote Condensers  
The most important consideration which must be taken into account when  
deciding upon the location of air-cooled equipment is the provision for a  
supply of ambient air to the condenser, and removal of heated air from the  
Another consideration which must be taken is that the unit should be  
mounted away from noise sensitive spaces and must have adequate support  
to avoid vibration and noise transmission into the building. Units should be  
condensing unit or remote condenser area. Where this essential requirement mounted over corridors, utility areas, rest rooms and other auxiliary areas  
is not adhered to, it will result in higher head pressures, which cause poor  
operation and potential failure of equipment. Units must not be located  
in the vicinity of steam, hot air or fume exhausts. Corrosive atmospheres  
require custom designed condensers.  
where high levels of sound are not an important factor. Sound and structural  
consultants should be retained for recommendations.  
Figure 1. Space and Location Requirements for Condensing Units  
Walls or Obstructions  
Multiple Units  
For units placed side by side, the minimum distance between  
units is the width of the largest unit. If units are placed end to  
end, the minimum distance between units is 4 feet.  
The unit should be located so that air may circulate freely and not be  
recirculated. For proper air flow and access all sides of the unit should be  
a minimum of “Waway from any wall or obstruction. It is preferred that  
this distance be increased whenever possible. Care should be taken to  
see that ample room is left for maintenance work through access doors  
and panels. Overhead obstructions are not permitted. When the unit is  
in an area where it is enclosed by three walls the unit must be installed  
as indicated for units in a pit.  
Multiple Units with Horizontal Air Flow  
Clearance for multiple units placed side by side  
AIR FLOW  
AIR FLOW  
Walls or Obstructions for Horizontal Air Flow  
W
Clearance from walls or obstructions  
W
W
MIN.  
AIR FLOW  
AIR FLOW  
AIR FLOW  
W
MIN.  
W
W
W
W
MIN.  
AIR FLOW  
W
W
Units in Pits  
The top of the unit should be level with the top of the pit, and side  
distance increased to “2W.  
If the top of the unit is not level with the top of pit, discharge cones or  
stacks must be used to raise discharge air to the top of the pit. This is a  
minimum requirement.  
Decorative Fences  
Fences must have 50% free area, with 1 foot undercut, a “W”  
minimum clearance, and must not exceed the top of unit. If these  
requirements are not met, unit must be installed as indicated for  
“Units in pits.  
Clearance for units in pits  
Clearance for fence enclosures  
STACK  
(SUPPLIED BY OTHERS)  
AIR FLOW  
AIR FLOW  
10 FT. MAX.  
W
MIN.  
W
MIN.  
W
2W  
MIN.  
2W  
MIN.  
W
1 FT. MIN.  
AIR FLOW  
NOT RECOMMENDED  
W
W
W
W
W
AIR FLOW  
AIR FLOW  
AIR FLOW  
AIR FLOW  
AIR FLOW  
* “W= Total width of the condensing unit  
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Requirements for Remote and Water Cooled  
Condensing Units  
General Installation  
2. A double riser discharge line may be used as shown in  
Diagram 2. Line “Ashould be sized to carry the oil at minimum  
load conditions and the line “Bshould be sized so that at the  
full load conditions both lines would have sufficient flow velocity  
to carry the oil to the condenser.  
The indoor compressor units are designed to be used with a remote  
condenser. The water cooled units are similar, except that they have an  
integral water cooled condenser. Inlet and outlet water connections are to  
be made in the field. On units having a compressor water jacket, incoming  
water shall be routed through the jacket prior to entering the condenser. For  
cleaning purposes, condenser end plates can be removed to give access to  
the water tubes. Cleaning is accomplished by a simple spiral tool powered  
by an ordinary electric drill. During installation, allow space for cleaning the  
condenser. Commercial equipment of this type is intended for installation  
by qualified refrigeration mechanics.  
Water Regulating Valve  
Using this control on the water cooled condensing units, the head pressure  
can be maintained by adjusting the flow of water through the condenser  
section. This type control is most often located on the water entering side of  
the condenser and is regulated by the refrigerant condensing pressure.  
Typical Arrangements  
Diagram 1 illustrates a typical piping arrangement involving a remote  
condenser located at a higher elevation, as commonly encountered when  
the condenser is on a roof and the compressor and receiver are on grade  
level or in a basement equipment room.  
Subcooler  
Diagrams 1 and 2 below show typical subcooler piping. Diagram 1 is the  
preferred connection with receiver as it provides maximum subcooling.  
Diagram 2 may be used if the receiver is located far from the condenser.  
Notes:  
In this case, the design of the discharge line is very critical. If properly sized  
for full load condition, the gas velocity might be too low at reduced loads  
to carry oil up through the discharge line and condenser coil. Reducing the  
discharge line size would increase the gas velocity sufficiently at reduced  
load conditions; however, when operating at full load, the line would be  
greatly undersized, and thereby creating an excessive refrigerant pressure  
drop. This condition can be overcome in one of two of the following ways:  
1. All oil traps are to be as short in radius as possible. Common practice is  
to fabricate the trap using three 90 degree ells.  
2. Pressure relief valves are recommended at the condenser for protection  
of the coil.  
3. A pressure valve at the high point in the discharge line is recommended  
to aid in removing non-condensables.  
4. The placement of a subcooler should be that it does not interfere with  
normal airflow of the condenser. Increased static of the unit could cause  
a decrease in system capacity and fan motor damage.  
1. The discharge line may be properly sized for the desired pressure  
drop at full load conditions and an oil separator installed at the  
bottom of the trap in the discharge line from the compressor.  
Diagram 1  
Diagram 2  
City & Tower Water Connections  
In the refrigeration industry “Cityand “Towerare designations of  
temperature and flow conditions, not applications. The term “Cityrefers  
to operating conditions where incoming water is 75˚F, and condensing  
temperature is 105˚F. Towerrefers to a higher temperature relationship  
which is normally 85˚F, incoming water and 105˚F condensing temperature.  
Figure 2. Water Connections  
Water circuits in some condenser models provide a center, or Tower, outlet  
connection to allow divided inlet water flow. This extra water port reduces  
water velocity, water pressure drop, and condenser wear in applications such  
as cooling towers where higher inlet temperatures and water flows occur.  
Water Connections for City  
For City water (open system) high pressure applications, the Tower  
connections is plugged.  
Water Connections for Tower  
For Tower usage and low pressure applications, both normal water  
connections will be used as inlets and the tower connection as an outlet.  
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Condensing Unit Rigging and Mounting  
Figure ꢀ. Spring Mount  
Rigging holes are provided on all units. Caution should be exercised when  
moving these units. To prevent damage to the unit housing during rigging,  
cables or chains used must be held apart by spacer bars. The mounting  
platform or base should be level and located so as to permit free access of  
supply air.  
Ground Mounting  
Concrete slab raised six inches above ground level provides a suitable base.  
Raising the base above ground level provides some protection from ground  
water and wind blown matter. Before tightening mounting bolts, recheck  
level of unit. The unit should in all cases be located with a clear space in all  
directions that is at a minimum, equal to the height of the unit above the  
mounting surface. A condensing unit mounted in a corner formed by two  
walls, may result in discharge air recirculation with resulting loss of capacity.  
Roof Mounting  
Due to the weight of the units, a structural analysis by a qualified engineer  
may be required before mounting. Roof mounted units should be installed  
level on steel channels or an I-beam frame capable of supporting the weight  
of the unit. Vibration absorbing pads or springs should be installed between  
the condensing unit legs or frame and the roof mounting assembly.  
Access  
Provide adequate space at the compressor end of the unit for servicing.  
Provide adequate space on the connection side to permit service of components.  
Spring Mounted Compressor  
Compressors are secured rigidly to make sure there is no transit damage.  
Before operating the unit, it is necessary to follow these steps:  
a) Remove the upper nuts and washers.  
b) Discard the shipping spacers.  
c)  
Install the neoprene spacers. (Spacers located in the electrical  
panel or tied to compressor.)  
Figure ꢁ. Solid Mount for Mobile or Deep Sump Application  
d) Replace the upper mounting nuts and washers.  
e) Allow 1/16 inch space between the mounting nut/washer and  
rubber spacer. Mounting spring must not be fully compressed  
when mounting nut is properly installed. See Figures 3 and 5.  
Rigid Mounted Compressor  
Some products use rigid mounted compressors. Check the compressor  
mounting bolts to insure they have not vibrated loose during shipment. See  
Figure 4.  
Figure 5. Spring Mount  
5
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Head Pressure Control  
Several types of head pressure control systems are available on  
condensing units:  
C. Ambient Fan Cycle Control  
This is an automatic winter control method which will maintain a condensing  
pressure within reasonable limits by cycling fan motors in response to  
outside air temperature. The thermostat(s) should be field adjusted to shut  
off the fan when the condensing temperature is reduced to approximately  
90˚F. Table 1 lists approximate settings for several system T.D.’s. These settings  
are approximate as they do not take into account variations in load.  
A. Dual Valve System. (See section on operation and adjustment.)  
B.  
Single Valve system. No adjustments are necessary.  
(See section on operation.)  
C. Ambient Fan Cycle Control. (See section on operation  
and adjustment.)  
A. Dual Valve System  
Table 1. Ambient Fan Cycle Thermostat Settings  
The system employs an ORI (open on rise of inlet pressure) valve and an ORD  
( open on rise of differential pressure) valve. The high pressure discharge gas  
is introduced above the liquid in the receiver tank. The receiver discharge is  
regulated by the ORI valve.  
The discharge pressure of the ORI valve must be adjusted to regulate the unit  
for proper operating conditions. Adjust the ORI valve shown on the following  
diagram to maintain a discharge pressure of 160 to 180 PSIG.  
Design  
T.D.  
30  
Thermostat Settings  
Models  
T1  
60  
65  
70  
75  
60  
65  
70  
75  
60  
65  
70  
75  
T2  
Tꢀ  
2-fan units:  
4-fan units:  
3-fan units:  
6-fan units:  
8-fan units:  
25  
20  
15  
30  
25  
20  
15  
30  
40  
55  
60  
65  
50  
55  
65  
70  
Figure ꢂ. Dual Valve Piping Arrangement  
30  
40  
50  
60  
25  
20  
15  
NOTE: Cycle pairs of fans on double wide units.  
Operation and Adjustment  
Condensing units with dual valves require sufficient charge to partially flood  
the condenser during low ambient conditions.  
Valve adjustment should be made with gauges connected to the discharge  
port of the compressor. Adjustments should be made during mild or  
low ambient conditions. Turning the valve stem “clockwiseon the ORI  
valve will increase the discharge pressure, while turning the valve stem  
“counterclockwisewill decrease the discharge pressure.  
If adjustments are made during warm ambient conditions, it may not be  
possible to adjust the regulator valve as low as desired. Readjustment may  
be necessary once cooler conditions prevail.  
B. Single Valve System  
The standard valve used on high pressure refrigerant systems controls  
the head pressure at approximately 180 PSIG. There is no adjustment for  
this valve. On low pressure refrigerant systems the valve controls pressure  
at approximately 100 PSIG. For energy efficiency, the 100 PSIG valve is  
sometimes used on high pressure refrigerant systems.  
At condensing pressures above the valve setting, flow enters Port C and  
leaves Port R. When the condensing pressure falls below the valve setting,  
the valve modulates to permit discharge gas to enter Port D. Metering  
discharge gas into the refrigerant flow leaving the condenser produces a  
higher pressure at the condenser outlet, reduces the flow, and causes the  
level of liquid refrigerant to rise in the condenser. This “floodingof the  
condenser with liquid refrigerant reduces the available condensing surface,  
holding the condensing pressure at the valve setting.  
Figure 7. Single Valve Flooding Valve Piping Arrangement  
CAUTION:  
Fans closest to the headers should not be cycled on standard temperature or pressure controls. Dramatic temperature and pressure changes at the  
headers as a result of fan action can result in possible tube failure. Fan motors are designed for continuous duty operation.  
Fan cycling controls should be adjusted to maintain a minimum of (5) minutes on and (5) minutes off. Short cycling of fans may result in a  
premature failure of motor and/or fan blade.  
Compressors operating below +10°F SST must have air flowing over the compressor at all times when the compressor is running.  
CAUTION:  
Under no circumstance should all condenser motors be allowed to cycle off on one control. At least one motor shall be wired to operate at all times.  
Under most circumstances, the condenser motor nearest the inlet header should remain on whenever the compressor is operating.  
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Refrigeration Oils*  
Oil Types  
With the changes that have taken place in our industry due to the CFC  
issue, we have reevaluated our lubricants to ensure compatibility with the  
new HFC refrigerants and HCFC interim blends offered by several chemical  
producers. As a secondary criteria, it is also desirable that any new lubricant  
be compatible with the traditional refrigerants such as HCFC-22 or R502. This  
“backward compatibilityhas been achieved with the introduction of the  
Polyol ester lubricants.  
Table 2 below summarizes which oils/lubricants are approved for use in  
Copeland compressors.  
Mineral Oils  
The BR and Scroll compressors use Sontex 200, a “white oil. This oil is  
not suitable for low temperature applications nor is it available through  
the normal refrigeration wholesalers. For field “top-offthe use of 3GS or  
equivalent, or Zerol 200TD is permissible, as long as at least 50% of the total  
oil charge remains Sontex 200.  
Suniso 3GS, Texaco WF32 and Calumet R015 (yellow oils) are available  
through normal refrigeration wholesalers. These oils are compatible if mixed  
and can be used on both high and low temperature systems.  
Polyol Ester Lubricants  
Hygroscopicity  
Ester lubricants (POE) have the characteristic of quickly absorbing moisture  
from the ambient surroundings. This is shown graphically in Figure 8 where  
it can be seen that such lubricants absorb moisture faster and in greater  
quantity than conventional mineral oils. Since moisture levels greater  
than 100 ppm will results in system corrosion and ultimate failure, it is  
imperative that compressors, components, containers and the entire system  
be kept sealed as much as possible. Lubricants will be packaged in specially  
designed, sealed containers. After opening, all the lubricant in a container  
should be used at once since it will readily absorb moisture if left exposed to  
the ambient. Any unused lubricant should be properly disposed of. Similarly,  
work on systems and compressors must be carried out with the open time as  
short as possible. Leaving the system or compressor open during breaks or  
overnight MUST BE AVOIDED!  
Polyol Ester Lubricants  
The Mobil EAL ARCTIC 22 CC is the preferred Polyol ester due to unique  
additives included in this lubricant. ICI Emkarate RL 32S is an acceptable  
Polyol ester lubricant approved for use when Mobil is not available. These  
POE’s must be used if HFC refrigerants are used in the system. They are  
also acceptable for use with any of the traditional refrigerants or interim  
blends and are compatible with mineral oils. They can therefore be mixed  
with mineral oils when used in systems with CFC or HCFC refrigerants when  
Copeland compressors are used. These lubricants are compatible with one  
another and can be mixed.  
Figure 8.  
Alkyl Benzenes  
Zerol 200TD is an alkyl benzene (AB) lubricant. Copeland recommends this  
lubricant for use as a mixture with mineral oil (MO) when using the interim  
blends such as R-401A, R-401B and R-402A (MP39, MP66 and HP80). A  
minimum of 50% AB is required in these mixtures to assure proper oil return.  
Shell MS 2212 is a 70/30 mixture of AB/MO. If this lubricant is used in a  
retrofit situation virtually all of the existing MO must be drained prior to  
refilling with the MS 2212 to assure a minimum 50% AB content.  
Color  
As received, the POE lubricant will be clear or straw colored. After use, it may  
acquire a darker color. This does not indicate a problem as the darker color  
merely reflects the activity of the lubricant's protective additive.  
Oil Level  
During Copeland's testing of Polyol ester oil, it was found that this lubricant  
exhibits a greater tendency to introduce oil into the cylinder during flooded  
start conditions. If allowed to continue, this condition will cause mechanical  
failure of the compressor.  
A crankcase heater is required with condensing units and it must be turned  
on several hours before start-up.  
Oil level must not exceed 1/4 sight glass.  
Table 2. Refrigeration Oils  
Refrigeration Oils  
Interims  
Rꢁ01A, Rꢁ01B, Rꢁ02A  
(MP-ꢀ9, MP-ꢂꢂ, HP-80)  
Traditional Refrigerants  
HCFC-22  
HFC's  
HFC-1ꢀꢁa, Rꢁ0ꢁA, R507  
POE's  
Mobil EAL ARCTIC 22 CC  
ICI (Virginia KMP) EMKARATE RL 32CF  
Suniso 3GS  
A
A
P
A
A
P
Mineral Oils  
P
PM  
PM  
PM  
NOT ACCEPTABLE  
Texaco WF32  
P
Calumet RO15 (Witco)  
Sontex 200-LT (White Oil)  
Witco LP-200  
P
(BR & Scroll Only)  
P
A/B  
Zerol 200TD  
AM  
PM  
PM  
NOT ACCEPTABLE  
Soltex Type AB-200  
P = Preferred Lubricant Choice  
A = Acceptable Alternative M = Mixture of Mineral Oil and Alkyl Benzene (AB) with minimum 50% AB.  
*(Reprinted by permission from Copeland Corporation)  
7
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d) Suitable P-type oil traps should be located at the base of each  
suction riser to enhance oil return to the compressor.  
Phase Loss Monitor  
The combination phase sequence and loss monitor relay protects the system  
against phase loss (single phasing), phase reversal (improper sequence) and  
low voltage (brownout). When phase sequence is correct and full line voltage  
is present on all three phases, the relay is energized as the normal condition  
indicator light glows.  
Note: If compressor fails to operate and the normal condition indicator light  
on the phase monitor does not glow, then the supplied electrical current  
is not in phase with the monitor. This problem is easily corrected by the  
following steps:  
e) For desired method of superheat measurement, a pressure tap  
should be installed in each evaporator suction line in  
the proximity of the expansion valve bulb.  
f)  
When brazing refrigerant lines, an inert gas should be passed  
through the line at low pressure to prevent scaling and  
oxidation inside the tubing. Dry nitrogen is preferred.  
g) Use only a suitable silver solder alloy on suction and liquid lines.  
h) Limit the soldering paste or flux to the minimum required to  
prevent contamination of the solder joint internally. Flux only the  
male portion of the connection, never the female. After brazing,  
remove excess flux.  
1. Turn power off at disconnect switch.  
2. Swap any two of the three power input wires.  
3. Turn power on. Indicator light should glow and compressor  
should start.  
4. Observe motors for correct rotation.  
i)  
See Table 6 for discharge and liquid drain line sizes for remote  
condenser connections.  
j)  
If isolation valves are installed at the evaporator, full port ball  
valves should be used.  
Recommended Refrigerant Piping Practices  
The system as supplied by Heatcraft Refrigeration Products, was  
thoroughly cleaned and dehydrated at the factory. Foreign matter may enter  
the system by way of the evaporator to condensing unit piping. Therefore,  
care must be used during installation of the piping to prevent entrance of  
foreign matter.  
Install all refrigeration system components in accordance with applicable  
local and national codes and in conformance with good practice required for  
the proper operation of the system.  
Refrigerant Pipe Support  
1. Normally, any straight run of tubing must be supported in at least two  
locations near each end of the run. Long runs require additional  
supports. The refrigerant lines should be supported and fastened  
properly. As a guide, 3/8 to 7/8 should be supported every 5 feet; 1-1/8  
and 1-3/8 every 7 feet; and 1-5/8 and 2-1/8 every 9 to 10 feet.  
2. When changing directions in a run of tubing, no corner should be left  
unsupported. Supports should be placed a maximum of 2 feet in each  
direction from the corner.  
3. Piping attached to a vibrating object (such as a compressor or  
compressor base) must be supported in such a manner that will not  
restrict the movement of the vibrating object. Rigid mounting will  
fatigue the copper tubing.  
4. Do not use short radius ells. Short radius elbows have points of excessive  
stress concentration and are subject to breakage at these points.  
The refrigerant pipe size should be selected from the Line Sizing Tables. The  
interconnecting pipe size is not necessarily the same size as the stub-out on  
the condensing unit or the evaporator.  
The following procedures should be followed:  
a) Do not leave dehydrated compressors or filter-driers on  
condensing units open to the atmosphere any longer than is  
absolutely necessary.  
b) Use only refrigeration grade copper tubing, properly sealed  
against contamination.  
5. Thoroughly inspect all piping after the equipment is in operation and  
add supports wherever line vibration is significantly greater than most  
of the other piping. Extra supports are relatively inexpensive as  
compared to refrigerant loss.  
c)  
Suction lines should slope 1/4" per 10 feet towards  
the compressor.  
Figure 9. Example of Pipe Support  
Figure 10. Condensing Unit / Compressor to Wall Support  
Suction Lines  
Suction Line Risers  
Horizontal suction lines should slope away from the evaporator toward  
the compressor at the rate of 1/4 inch per 10 feet for good oil return. When  
multiple evaporators are connected in series using a common suction line,  
the branch suction lines must enter the top of the common suction line.  
For dual or multiple evaporator systems, the branch lines to each evaporator  
should be sized for the evaporator capacity. The main common line should  
be sized for the total system capacity.  
Prefabricated wrought copper traps are available, or a trap can be made  
by using two street ells and one regular ell. The suction trap must be the  
same size as the suction line. For long vertical risers, additional traps may  
be necessary. Generally, one trap is recommended for each length of pipe  
(approximately 20 feet) to insure proper oil movement. See Figure 11 for  
methods of constructing proper suction line P-traps.  
Suction lines that are outside of refrigerated space must be insulated. See  
the Line Insulation section on page 14 for more information.  
Figure 12. Double Suction Riser Construction  
Sized for  
Minimum  
Load  
Sized for  
Minimum  
Load  
Figure 11. Suction P-Traps  
Sized  
for Full  
Load  
Sized  
for Full  
Load  
NOTE:  
A suction line trap must be installed at the point where piping changes the direction of refrigerant flow from any horizontal run to an upward vertical run.  
8
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Three Pipe System  
Liquid Lines  
The three pipe system (sometimes called re-evap.) uses three pipes: one for  
liquid line, one for suction line, and one for hot gas line. In addition, a re-  
evaporator accumulator is used at the suction outlet of the evaporator. The  
hot gas is taken from the discharge line between the compressor and the  
condenser, through a hot gas solenoid valve, then to the evaporator drain  
pan circuit, distributor tee, through the coil. See the Three-Pipe Defrost  
Piping Diagram for typical piping at the evaporator coil.  
Liquid lines should be sized for a minimum pressure drop to prevent  
“flashing. Flashing in the liquid lines would create additional pressure drop  
and poor expansion valve operation. If a system requires long liquid lines  
from the receiver to the evaporator or if the liquid has to rise vertically  
upward any distance, the losses should be calculated to determine whether  
or not a heat exchanger is required. The use of a suction to liquid heat  
exchanger may be used to subcool the liquid to prevent flashing. This  
method of subcooling will normally provide no more than 20˚F subcooling  
on high pressure systems. The amount of subcooling will depend on the  
design and size of the heat exchanger and on the operating suction and  
discharge pressures. An additional benefit from the use of the suction to  
liquid type heat exchanger is that it can help raise the superheat in the  
suction line to prevent liquid return to the compressor via the suction line.  
Generally, heat exchangers are not recommended on R-22 low temperature  
systems. However, they have proved necessary on short, well insulated  
suction line runs to provide superheat at the compressor.  
Alternating Evaporator System  
In the alternating evaporator hot gas defrost system, a third line is taken  
off the compressor discharge line as the re-evap system. It is piped with  
solenoids at each evaporator, so that hot gas defrost is accomplished on one  
or more evaporators while the remaining evaporators continue to function  
in a normal manner. The liquid from defrosting evaporators is reintroduced  
to the main liquid line and it is necessary that 75% or greater capacity be  
retained in the normal refrigeration cycle to offset the capacity that is being  
removed by the units on the hot gas defrost.  
Hot Gas Defrost Systems  
Hot Gas Defrost systems can be described as reverse cycle, re-evap., or  
alternating evaporator. Please see manual H-IM-HGD for Mohave™ systems.  
IMPORTANT:  
It is imperative that with the alternating evaporator hot  
gas defrost system, no more that 25% of the operating  
refrigeration load be in defrost at any time.  
Refrigerant Piping  
Install all refrigerant components in accordance with applicable local and  
national codes and in accordance with good practice for proper system  
operation. The thermostatic expansion valve must be the externally  
equalized type. It can be mounted inside the unit end compartment. Mount  
the expansion valve bulb on a horizontal run of suction line as close as  
possible to the suction header. Use the clamps provided with the valve to  
fasten the bulb securely so there is a tight line-to-line contact between the  
bulb and the suction line. Suction and hot gas connections are made on the  
outside of the unit.  
Hot gas line sizes for R-22, Rꢁ0ꢁA and R507  
Equivalent Discharge Length (Ft.)  
System Capacity  
BTU/Hr  
4,000  
25  
1/2  
50  
1/2  
75  
1/2  
100  
1/2  
1/2  
5/8  
5/8  
150  
1/2  
1/2  
5/8  
5/8  
5,000  
1/2  
1/2  
1/2  
6,000  
1/2  
1/2  
1/2  
7,000  
1/2  
1/2  
5/8  
Suction lines should be sloped towards the compressor at the rate of one  
(1) inch per ten (10) feet for good oil return. Vertical risers of more than four  
(4) feet should be trapped at the bottom with a P-trap. If a P-trap is used, the  
expansion valve bulb should be installed between the unit and the trap.  
8,000  
9,000  
1/2  
1/2  
1/2  
5/8  
5/8  
5/8  
5/8  
5/8  
7/8  
7/8  
7/8  
7/8  
7/8  
7/8  
5/8  
5/8  
5/8  
5/8  
5/8  
5/8  
7/8  
7/8  
5/8  
5/8  
5/8  
5/8  
7/8  
7/8  
7/8  
7/8  
5/8  
5/8  
5/8  
7/8  
7/8  
7/8  
7/8  
7/8  
5/8  
5/8  
5/8  
7/8  
7/8  
7/8  
7/8  
7/8  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-3/8  
1-3/8  
1-5/8  
1-5/8  
1-5/8  
10,000  
12,000  
14,000  
16,000  
18,000  
20,000  
25,000  
30,000  
35,000  
40,000  
45,000  
50,000  
60,000  
70,000  
80,000  
90,000  
100,000  
Reverse Cycle System  
The hot gas unit coolers can be used in reverse cycle hot gas defrost systems  
using multiple evaporators connected to one condensing unit. Generally, not  
more than one-third of the system defrosts at one time. During the reverse  
cycle defrost, the reversing valve, located in the compressor discharge line,  
diverts hot gas through the suction line to the evaporator.  
See the piping view in the Reverse Cycle Defrost Piping diagram. The suction  
line check valve directs the hot gas through the drain pan loop which  
prevents condensate in the pan from freezing. The hot gas exits the loop at  
the pan loop outlet header and enters the evaporator through the check  
valve assembly. As the hot gas defrosts the coil, heat is removed from the  
hot gas and eventually it condenses into a liquid and exits the coil at the  
distributor side port. The liquid then flows through the check valve of the  
thermostatic expansion valve bypass assembly, around the thermostatic  
expansion valve, and into the system liquid line. The liquid refrigerant then  
feeds other evaporators on the cooling cycle, evaporates, and returns to the  
compressor through their suction lines.  
7/8  
7/8  
7/8  
7/8  
7/8  
7/8  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-3/8  
1-3/8  
1-3/8  
1-5/8  
1-5/8  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-3/8  
1-3/8  
1-3/8  
1-3/8  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-3/8  
1-3/8  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
Note: Use next larger hot gas line size for -200F. and lower suction temperatures.  
THREE-PIPE DEFROST PIPING  
EVAP. COIL  
REVERSE CYCLE DEFROST PIPING  
EVAP. COIL  
CHECK  
VALVE  
TXV  
CHECK  
TXV  
VALVE  
CHECK VALVE  
PAN LOOP  
PAN LOOP  
LIQUID  
LINE  
HOT GAS LINE  
HEAT – X  
LIQUID LINE  
HEAT – X  
SUCTION LINE  
SUCTION  
LINE  
CHECK VALVE  
9
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Determine line size 1 (main line from condensing unit):  
1. Main line from the condensing unit to be sized for the total capacity  
(balance) of the whole system of 24,000 BTUH’s (Table 8).  
2. Refer to 24,000 @100 feet at -20°F SST R404A on the chart.  
You will find the suction line to be 1-3/8" and 1/2" liquid line.  
3. Refer to Table 5. For every 1-3/8" 90° elbow you must add 4 equivalent  
feet of pipe and 2.5 equivalent feet of pipe for each 1-3/8" tee.  
Therefore, total equivalent line run =  
Unit Cooler Piping  
Pipe size example:  
Given: -10°F Freezer with one system having (2) evaporators  
• One condensing unit rated at 24,000 BTUH’s @ -20°F SST R404A  
refrigerant.  
• Two evaporators each rated at 12,000 BTUH’s @ 10°F TD.  
• 100 feet of actual line run between condensing unit to first evaporator  
and 20 feet of actual line run between the first evaporator and the  
second evaporator (see figure below).  
Actual line run  
100 feet  
24 feet  
+ (6) 1-3/8" elbows @ 4'  
+ (1) 1-3/8" tee @ 2.5'  
Total equivalent line run  
2.5 feet  
12ꢂ.5 feet  
How to figure line sizes:  
1. Determine equivalent line run = actual run + valves and fitting allowances.  
2. Use Line Sizing Tables to size lines.  
4. Refer to Table 8. For 126.5 total equivalent feet, the suction  
line size should be 1-3/8" and the liquid line stays at 1/2" line.  
Note: The gray shaded areas on Table 8. For 24,000 BTUH’s, the maximum  
suction riser is 1-1/8" to insure proper oil return and pressure drop from the  
bottom p-trap to the top p-trap.  
3. Note any special considerations.  
Determine line size 2 (evaporators):  
1. Line sizing to each evaporator is based on 12,000 BTUH’s and  
equivalent run from condensing unit. First evaporator has an 105 ft.  
run and the second evaporator has a 120 ft. run.  
2. Table 8 indicates 1-1/8" suction for the first evaporator and indicates  
1-1/8" suction for the second evaporator.  
3. Refer to Table 5. Each 1-1/8" 90° elbow adds 3 equivalent feet of pipe.  
Each 90° turn through a 1-1/8" tee adds 6 equivalent feet.  
4.  
Actual line run (evap 1)  
+ (5) 1-1/8" elbows @ 3'  
105 feet  
15 feet  
Evap. 1  
+ (1) 90° turn through tee @ 6' 6 feet  
Evap. 2  
Total equivalent line run  
12ꢂ feet  
Fittings in this system:  
• (6) 90° elbows in main line plus a 90° turn through a tee.  
• (5) addtional 90° elbows to first evaporator.  
• (4) additional 90° elbows to second evaporator.  
Actual line run (evap 2)  
+ (4) 1-1/8" elbows @ 3'  
Total equivalent line run  
120 feet  
12 feet  
1ꢀ2 feet  
5. Table 8 indicates 1-1/8" suction line and 3/8" liquid line from  
main line to both evaporators.  
Line Sizing  
When determining the refrigerant line length, be sure to add an allowance  
for fittings. See Table 5. Total equivalent length of refrigerant lines is the sum  
of the actual linear footage and the allowance for fittings.  
The following Tables 7 and 8 indicate liquid lines and suction lines for all  
condensing units for R22, R404A, and R507.  
Table ꢀ. Weight of Refrigerants in Copper Lines During Operation (Pounds per 100 lineal feet of type "L" tubing)  
Suction Line at Suction Temperature  
Line Size O.D.  
(Inches)  
Refrigerant  
Liquid Line  
Hot Gas Line  
-ꢁ0˚F  
0.02  
0.03  
0.03  
0.04  
0.05  
0.07  
0.10  
0.15  
0.17  
0.26  
0.27  
0.40  
0.37  
0.56  
0.65  
0.98  
1.01  
1.51  
1.44  
2.16  
1.94  
2.92  
2.53  
3.80  
-20˚F  
0.03  
0.04  
0.05  
0.07  
0.08  
0.11  
0.16  
0.23  
0.28  
0.39  
0.42  
0.58  
0.59  
0.82  
1.03  
1.43  
1.59  
2.21  
2.28  
3.15  
3.08  
4.25  
4.01  
5.55  
0˚F  
+20˚F  
0.06  
0.09  
0.11  
0.16  
0.17  
0.25  
0.36  
0.51  
0.61  
0.86  
0.93  
1.32  
1.33  
1.86  
2.30  
3.23  
3.54  
5.00  
5.05  
7.14  
6.83  
19.65  
8.90  
12.58  
+ꢁ0˚F  
0.08  
0.13  
0.15  
0.24  
0.25  
0.35  
0.51  
0.72  
0.87  
1.24  
1.33  
1.87  
1.88  
2.64  
3.26  
4.58  
5.03  
7.07  
7.18  
9.95  
9.74  
13.67  
12.70  
17.80  
22  
R507, 404A  
22  
R507, 404A  
22  
R507, 404A  
22  
R507, 404A  
22  
R507, 404A  
22  
R507, 404A  
22  
R507, 404A  
22  
R507, 404A  
22  
R507, 404A  
22  
R507, 404A  
22  
R507, 404A  
22  
R507, 404A  
3.9  
3.4  
7.4  
0.22  
0.31  
0.41  
0.58  
0.65  
0.93  
1.35  
1.92  
2.30  
3.27  
3.50  
4.98  
4.96  
7.07  
8.61  
12.25  
13.70  
18.92  
18.95  
27.05  
25.60  
36.50  
33.40  
47.57  
0.04  
0.06  
0.07  
0.13  
0.12  
0.17  
0.24  
0.37  
0.42  
0.63  
0.64  
0.95  
0.90  
1.35  
1.57  
2.35  
2.42  
3.62  
3.45  
5.17  
4.67  
6.97  
6.08  
9.09  
3/8  
1/2  
6.4  
11.8  
10.3  
24.4  
21.2  
41.6  
36.1  
63.5  
55.0  
90.0  
78.0  
156  
134  
241  
209  
344  
298  
465  
403  
605  
526  
5/8  
7/8  
1-1/8  
1-3/8  
1-5/8  
2-1/8  
2-5/8  
3-1/8  
3-5/8  
4-1/8  
10  
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Table ꢁ. Pressure Loss of Liquid Refrigerants in Liquid Line Risers (Expressed in Pressure Drop, PSIG, and Subcooling Loss, ˚F)  
Liquid Line Rise in Feet  
Refrigerant  
10'  
PSIG  
4.8  
15'  
20'  
PSIG  
9.7  
25'  
ꢀ0'  
ꢁ0'  
50'  
75'  
100'  
PSIG  
˚F  
1.6  
1.1  
PSIG  
7.3  
6.1  
˚F  
2.3  
1.6  
˚F  
3.1  
2.1  
PSIG  
12.1  
10.2  
˚F  
3.8  
2.7  
PSIG  
14.5  
12.2  
˚F  
4.7  
3.3  
PSIG  
19.4  
16.3  
˚F  
6.2  
4.1  
PSIG  
24.2  
20.4  
˚F  
8.0  
5.6  
PSIG  
36.3  
30.6  
˚F  
12.1  
8.3  
˚F  
R22  
R507, R404A  
48.4  
40.8  
16.5  
11.8  
4.1  
8.2  
Based on 110˚F liquid temperature at bottom of riser.  
Table 5. Equivalent Feet of Pipe Due to Valve and Fitting Friction  
Copper Tube, O.D., Type “L”  
Globe Valve (Open)  
1/2  
14  
7
5/8  
16  
9
7/8  
22  
12  
5
1-1/8 1-3/8 1-5/8 2-1/8 2-5/8 3-1/8 3-5/8 4-1/8 5-1/8 6-1/8  
28  
15  
6
36  
18  
8
42  
21  
9
57  
28  
12  
3.5  
5
69  
34  
14  
4
83  
42  
17  
5
99  
49  
20  
6
118  
57  
22  
7
138  
70  
28  
9
168  
83  
Angle Valve (Open)  
90˚ Turn Through Tee  
3
4
34  
Tee (Straight Through) or Sweep Below  
90˚ Elbow or Reducing Tee (Straight Through)  
.75  
1
1
1.5  
2
2
2.5  
4
3
11  
2
3
4
7
8
10  
12  
14  
16  
Table ꢂ. Recommended Remote Condenser Line Sizes  
R-22  
R507 & R-ꢁ0ꢁA  
Net Evaporator  
Capacity  
Total Equiv.  
Length  
Liquid Line Cond. to  
Receiver (O.D.)  
Liquid Line Cond. to  
Discharge Line (O.D.)  
Discharge Line (O.D.)  
Receiver (O.D.)  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
100  
50  
3/8  
3/8  
3/8  
1/2  
1/2  
1/2  
1/2  
5/8  
5/8  
5/8  
5/8  
7/8  
7/8  
7/8  
7/8  
7/8  
7/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
1/2  
1/2  
5/8  
5/8  
7/8  
5/8  
3/8  
3/8  
1/2  
1/2  
1/2  
1/2  
1/2  
5/8  
5/8  
7/8  
5/8  
7/8  
7/8  
7/8  
7/8  
1-1/8  
7/8  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-3/8  
1-3/8  
1-5/8  
1-5/8  
2-1/8  
1-5/8  
2-1/8  
2-1/8  
2-1/8  
2-1/8  
2-1/8  
2-1/8  
2-5/8  
2-1/8  
2-5/8  
2-5/8  
2-5/8  
2-5/8  
3-1/8  
2-5/8  
3-1/8  
2-5/8  
3-5/8  
3-1/8  
3-5/8  
3-1/8  
3-5/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
1/2  
1/2  
1/2  
1/2  
5/8  
5/8  
7/8  
5/8  
7/8  
7/8  
3,000  
6,000  
9,000  
12,000  
18,000  
24,000  
36,000  
48,000  
60,000  
1-1/8  
7/8  
7/8  
7/8  
7/8  
7/8  
7/8  
7/8  
7/8  
7/8  
1-1/8  
7/8  
72,000  
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-3/8  
1-3/8  
1-5/8  
1-3/8  
1-5/8  
1-5/8  
2-1/8  
1-5/8  
2-1/8  
2-1/8  
2-1/8  
2-1/8  
2-5/8  
2-1/8  
2-5/8  
2-1/8  
2-5/8  
2-5/8  
2-5/8  
2-5/8  
3-1/8  
2-5/8  
3-1/8  
2-5/8  
3-1/8  
3-1/8  
3-5/8  
90,000  
1-1/8  
1-1/8  
1-3/8  
1-3/8  
1-5/8  
1-3/8  
1-5/8  
1-5/8  
2-1/8  
1-5/8  
2-1/8  
2-1/8  
2-5/8  
2-1/8  
2-5/8  
2-5/8  
3-1/8  
2-5/8  
3-1/8  
2-5/8  
3-5/8  
3-1/8  
3-5/8  
3-1/8  
4-1/8  
3-5/8  
4-1/8  
3-5/8  
4-1/8  
120,000  
180,000  
240,000  
300,000  
360,000  
480,000  
600,000  
720,000  
840,000  
960,000  
1,080,000  
1,200,000  
1,440,000  
1,680,000  
1-1/8  
1-1/8  
1-3/8  
1-3/8  
1-3/8  
1-3/8  
1-5/8  
1-5/8  
2-1/8  
1-5/8  
2-1/8  
2-1/8  
2-5/8  
2-1/8  
2-5/8  
2-1/8  
2-5/8  
2-5/8  
3-1/8  
2-5/8  
3-1/8  
2-5/8  
3-1/8  
3-1/8  
3-5/8  
3-1/8  
3-5/8  
100  
11  
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Table 7. Recommended Line Sizes for R-22 *  
Suction Line Size  
Liquid Line Size  
Suction Temperature  
Receiver to  
Expansion Valve  
Equivalent  
Capacity  
BTUH  
+ꢁ0˚F  
+20˚F  
+10˚F  
0˚F  
-10˚F  
-20˚F  
Equivalent Lengths Equivalent Lengths Equivalent Lengths Equivalent Lengths Equivalent Lengths Equivalent Lengths  
Lengths  
25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150'  
1,000  
3,000  
4,000  
6,000  
3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 1/2 3/8 3/8 3/8 1/2 3/8 3/8 1/2 1/2 3/8 3/8 3/8 3/8  
3/8 3/8 1/2 1/2 3/8 1/2 1/2 5/8 3/8 1/2 1/2 5/8 1/2 1/2 5/8 5/8 1/2 1/2 5/8 5/8 1/2 1/2 5/8 5/8 3/8 3/8 3/8 3/8  
3/8 3/8 1/2 1/2 3/8 1/2 1/2 5/8 1/2 1/2 5/8 5/8 1/2 1/2 5/8 5/8 1/2 1/2 5/8 5/8 1/2 5/8 5/8 7/8 3/8 3/8 3/8 3/8  
1/2 1/2 5/8 5/8 1/2 1/2 5/8 5/8 1/2 5/8 5/8 7/8 5/8 5/8 5/8 7/8 1/2 5/8 7/8 7/8 5/8 5/8 7/8 7/8 3/8 3/8 3/8 3/8  
1-  
9,000  
1/2 5/8 5/8 7/8 1/2 5/8 5/8 7/8 5/8 5/8 7/8 7/8 5/8 7/8 7/8 7/8 5/8 7/8 7/8 7/8 5/8 7/8 7/8  
3/8 3/8 3/8 3/8  
3/8 3/8 3/8 3/8  
3/8 3/8 3/8 3/8  
3/8 3/8 3/8 1/2  
3/8 3/8 1/2 1/2  
3/8 3/8 1/2 1/2  
3/8 1/2 1/2 1/2  
3/8 1/2 1/2 1/2  
1/2 1/2 1/2 1/2  
1/2 1/2 1/2 5/8  
1/2 1/2 5/8 5/8  
1/2 1/2 5/8 5/8  
1/2 1/2 5/8 5/8  
1/2 1/2 5/8 5/8  
1/2 5/8 5/8 5/8  
1/2 5/8 5/8 7/8  
5/8 5/8 7/8 7/8  
5/8 7/8 7/8 7/8  
5/8 7/8 7/8 7/8  
7/8 7/8 7/8 7/8  
1/8  
1-  
1- 1-  
12,000 5/8 5/8 7/8 7/8 5/8 5/8 7/8 7/8 5/8 7/8 7/8 7/8 5/8 7/8 7/8 7/8 7/8 7/8 7/8  
7/8 7/8  
7/8 7/8  
1/8  
1/8 1/8  
1-  
1-  
1- 1-  
1/8 1/8  
1- 1-  
1/8 1/8  
15,000 5/8 5/8 7/8 7/8 5/8 7/8 7/8 7/8 7/8 7/8 7/8  
18,000 5/8 7/8 7/8 7/8 5/8 7/8 7/8 7/8 7/8 7/8 7/8  
7/8 7/8 7/8  
7/8 7/8  
7/8 7/8  
1/8  
1/8  
1-  
1/8  
1- 1-  
1/8 1/8  
1- 1-  
1/8 1/8  
1- 1- 1-  
1/8 1/8 1/8  
7/8 7/8  
7/8  
7/8  
1-  
1-  
1- 1-  
1- 1- 1-  
1- 1- 1-  
1/8 1/8 3/8  
1- 1- 1-  
1/8 3/8 3/8  
24,000 5/8 7/8 7/8  
7/8 7/8 7/8  
7/8 7/8  
7/8  
7/8  
7/8  
7/8  
1/8  
1/8  
1/8 1/8  
1/8 1/8 1/8  
1- 1-  
1/8 1/8  
1- 1-  
1/8 1/8  
1- 1- 1-  
1/8 1/8 1/8  
1- 1- 1-  
1/8 1/8 3/8  
1- 1- 1- 1- 1- 1- 1-  
1/8 3/8 3/8 1/8 1/8 3/8 3/8  
30,000 7/8 7/8  
7/8 7/8  
7/8  
7/8  
1- 1- 1-  
1/8 1/8 1/8  
1- 1- 1-  
1/8 1/8 1/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1-  
1/8 1/8 3/8 1/8 1/8 3/8 3/8 1/8 1/8 3/8 3/8 1/8 3/8 3/8 5/8  
36,000 7/8  
42,000 7/8  
48,000 7/8  
54,000 7/8  
60,000 7/8  
66,000 7/8  
7/8  
7/8  
7/8  
1- 1- 1-  
1/8 1/8 1/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1-  
1/8 1/8 3/8 1/8 1/8 3/8 3/8 1/8 1/8 3/8 3/8 1/8 1/8 3/8 5/8 1/8 3/8 5/8 5/8  
1- 1- 1-  
1/8 1/8 1/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1-  
1/8 1/8 3/8 1/8 1/8 3/8 3/8 1/8 3/8 3/8 5/8 1/8 3/8 3/8 5/8 1/8 3/8 5/8 5/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 2-  
1/8 1/8 3/8 1/8 1/8 3/8 3/8 1/8 3/8 3/8 5/8 1/8 3/8 3/8 5/8 1/8 3/8 5/8 5/8 3/8 3/8 5/8 1/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 2-  
1/8 1/8 3/8 1/8 1/8 3/8 3/8 1/8 3/8 3/8 5/8 1/8 3/8 5/8 5/8 1/8 3/8 5/8 5/8 3/8 3/8 5/8 1/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 2-  
1/8 3/8 3/8 1/8 1/8 3/8 3/8 1/8 3/8 3/8 5/8 1/8 3/8 5/8 5/8 3/8 3/8 5/8 5/8 3/8 5/8 5/8 1/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 2- 1- 1- 1- 2- 1- 1- 2- 2-  
1/8 1/8 3/8 3/8 1/8 3/8 3/8 5/8 1/8 3/8 5/8 5/8 3/8 3/8 5/8 1/8 3/8 3/8 5/8 1/8 3/8 5/8 1/8 1/8  
72,000  
78,000  
84,000  
90,000  
120,000  
150,000  
180,000  
210,000  
240,000  
300,000  
360,000  
480,000  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 2- 1- 1- 1- 2- 1- 1- 2- 2-  
1/8 1/8 3/8 3/8 1/8 3/8 3/8 5/8 1/8 3/8 5/8 5/8 3/8 3/8 5/8 1/8 3/8 5/8 5/8 1/8 3/8 5/8 1/8 1/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 2- 1- 1- 2- 2- 1- 1- 2- 2-  
1/8 1/8 3/8 3/8 1/8 3/8 3/8 5/8 3/8 3/8 5/8 5/8 3/8 5/8 5/8 1/8 3/8 5/8 1/8 1/8 3/8 5/8 1/8 1/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 2- 1- 1- 2- 2- 1- 1- 2- 2- 1- 1- 2- 2-  
1/8 3/8 3/8 5/8 1/8 3/8 5/8 5/8 3/8 3/8 5/8 1/8 3/8 5/8 1/8 1/8 3/8 5/8 1/8 1/8 3/8 5/8 1/8 1/8  
1- 1- 1- 1- 1- 1- 1- 2- 1- 1- 2- 2- 1- 1- 2- 2- 1- 1- 2- 2- 1- 2- 2- 2-  
1/8 3/8 5/8 5/8 3/8 3/8 5/8 1/8 3/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 1/8 1/8 5/8  
1- 1- 1- 2- 1- 1- 2- 2- 1- 1- 2- 2- 1- 2- 2- 2- 1- 2- 2- 2- 2- 2- 2- 2-  
3/8 3/8 5/8 1/8 3/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 1/8 1/8 5/8 5/8  
1- 1- 2- 2- 1- 1- 2- 2- 1- 2- 2- 2- 1- 2- 2- 2- 1- 2- 2- 2- 2- 2- 2- 2-  
3/8 5/8 1/8 1/8 3/8 5/8 1/8 1/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8  
1- 1- 2- 2- 1- 2- 2- 2- 1- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 3-  
3/8 5/8 1/8 1/8 5/8 1/8 1/8 1/8 5/8 1/8 1/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 5/8 5/8 1/8  
1- 1- 2- 2- 1- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 3-  
5/8 5/8 1/8 1/8 5/8 1/8 1/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 5/8 5/8 1/8  
1-  
7/8 7/8 7/8  
1/8  
1- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 3- 2- 2- 2- 3- 2- 2- 3- 3-  
5/8 1/8 1/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 1/8 1/8  
1- 1-  
1/8 1/8  
7/8 7/8  
2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 3- 2- 2- 3- 3- 2- 2- 3- 3- 2- 3- 3- 3-  
1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 5/8 5/8 1/8 1/8 5/8 1/8 1/8 1/8 5/8 1/8 1/8 5/8 1/8 1/8 5/8  
1- 1-  
1/8 1/8  
7/8 7/8  
2- 2- 2- 2- 2- 2- 2- 3- 2- 2- 3- 3- 2- 2- 3- 3- 2- 3- 3- 3- 2- 3- 3- 3- 1- 1- 1- 1-  
1/8 1/8 5/8 5/8 1/8 5/8 5/8 1/8 1/8 5/8 1/8 1/8 5/8 5/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 5/8 5/8 1/8 1/8 1/8 3/8  
2- 2- 2- 3- 2- 2- 3- 3- 2- 2- 3- 3- 2- 3- 3- 3- 2- 3- 3- 3- 3- 3- 3- 4- 1- 1- 1- 1-  
1/8 5/8 5/8 1/8 1/8 5/8 1/8 1/8 5/8 5/8 1/8 5/8 5/8 1/8 5/8 5/8 5/8 1/8 5/8 5/8 1/8 1/8 5/8 1/8 1/8 1/8 3/8 3/8  
600,000  
* NOTES:  
1. Sizes that are highlighted indicate maximum suction line sizes that should be used for risers. Riser size should not exceed horizontal size.  
Properly placed suction traps must also be used for adequate oil return.  
All sizes shown are for O.D. Type L copper tubing.  
2. Suction line sizes selected at pressure drop equivalent to 2˚F. Reduce estimate of system capacity accordingly.  
3. Recommended liquid line size may increase with reverse cycle hot gas systems.  
4. If system load drops below 40% of design, consideration to installing double suction risers should be made.  
12  
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Table 8. Recommended Line Sizes for R-ꢁ0ꢁA and R507*  
Suction Line Size  
Suction Temperature  
Liquid Line Size  
Receiver to  
Expansion Valve  
Equivalent  
Capacity  
BTUH  
+20˚F  
+10˚F  
-10˚F -20˚F  
-ꢀ0˚F  
-ꢁ0˚F  
Equivalent Lengths Equivalent Lengths Equivalent Lengths Equivalent Lengths Equivalent Lengths Equivalent Lengths  
Lengths  
25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150'  
1,000  
3,000  
4,000  
6,000  
3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 1/2 1/2 3/8 3/8 1/2 1/2 3/8 3/8 1/2 1/2 3/8 1/2 1/2 5/8 3/8 3/8 3/8 3/8  
3/8 3/8 1/2 1/2 3/8 1/2 1/2 5/8 1/2 1/2 5/8 5/8 1/2 1/2 5/8 7/8 1/2 1/2 5/8 7/8 1/2 1/2 5/8 7/8 3/8 3/8 3/8 3/8  
3/8 1/2 1/2 5/8 1/2 1/2 5/8 5/8 1/2 5/8 5/8 7/8 1/2 5/8 7/8 7/8 5/8 5/8 7/8 7/8 1/2 5/8 7/8 7/8 3/8 3/8 3/8 3/8  
1/2 1/2 5/8 7/8 1/2 1/2 5/8 7/8 1/2 5/8 7/8 7/8 5/8 5/8 7/8 7/8 5/8 5/8 7/8 7/8 5/8 5/8 7/8 7/8 3/8 3/8 3/8 3/8  
1-  
1-  
1-  
9,000  
5/8 5/8 7/8 7/8 5/8 5/8 7/8 7/8 5/8 7/8 7/8 7/8 5/8 7/8 7/8  
5/8 7/8 7/8  
5/8 7/8 7/8  
3/8 3/8 3/8 3/8  
3/8 3/8 3/8 3/8  
3/8 3/8 3/8 1/2  
3/8 3/8 1/2 1/2  
3/8 3/8 1/2 1/2  
3/8 1/2 1/2 1/2  
1/2 1/2 1/2 1/2  
1/2 1/2 1/2 5/8  
1/2 1/2 5/8 5/8  
1/2 1/2 5/8 5/8  
1/2 1/2 5/8 5/8  
1/2 1/2 5/8 5/8  
1/2 5/8 5/8 5/8  
5/8 5/8 5/8 5/8  
5/8 5/8 5/8 7/8  
5/8 5/8 7/8 7/8  
5/8 5/8 7/8 7/8  
5/8 7/8 7/8 7/8  
1/8  
1/8  
1/8  
1-  
1- 1-  
1/8 1/8  
1- 1-  
1/8 1/8  
1- 1-  
1/8 1/8  
12,000 5/8 7/8 7/8 7/8 5/8 7/8 7/8 7/8 7/8 7/8 7/8  
7/8 7/8  
7/8 7/8  
7/8 7/8  
7/8 7/8  
7/8 7/8  
7/8 7/8  
1/8  
1-  
1- 1-  
1/8 1/8  
1- 1-  
1/8 1/8  
1- 1-  
1/8 1/8  
1- 1-  
1/8 1/8  
15,000 5/8 7/8 7/8 7/8 7/8 7/8 7/8  
7/8 7/8  
7/8 7/8  
1/8  
1-  
1/8  
1- 1-  
1/8 1/8  
1- 1-  
1/8 1/8  
1- 1- 1-  
1/8 1/8 3/8  
1- 1- 1-  
1/8 1/8 3/8  
1- 1- 1-  
1/8 1/8 3/8  
18,000 7/8 7/8 7/8  
7/8 7/8  
7/8  
7/8  
7/8  
1- 1-  
1- 1- 1-  
1/8 1/8 1/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1-  
1/8 1/8 3/8 1/8 1/8 3/8 3/8 1/8 1/8 3/8 3/8 1/8 1/8 3/8 3/8  
24,000 7/8 7/8  
30,000 7/8 7/8  
7/8  
7/8  
7/8  
1/8 1/8  
1- 1-  
1/8 1/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1-  
1/8 1/8 3/8 1/8 1/8 3/8 3/8 1/8 1/8 3/8 3/8 1/8 1/8 3/8 3/8 1/8 1/8 3/8 3/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1-  
1/8 1/8 3/8 1/8 1/8 3/8 3/8 1/8 1/8 3/8 3/8 1/8 1/8 3/8 3/8 1/8 3/8 3/8 3/8 1/8 3/8 3/8 5/8  
36,000 7/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1-  
1/8 1/8 3/8 3/8 1/8 1/8 3/8 3/8 1/8 3/8 3/8 5/8 1/8 3/8 5/8 5/8 1/8 3/8 3/8 5/8 1/8 3/8 3/8 5/8  
42,000  
48,000  
54,000  
60,000  
66,000  
72,000  
78,000  
84,000  
90,000  
120,000  
150,000  
180,000  
210,000  
240,000  
300,000  
360,000  
480,000  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1-  
1/8 1/8 3/8 3/8 1/8 1/8 3/8 5/8 1/8 3/8 3/8 5/8 1/8 3/8 5/8 5/8 1/8 3/8 3/8 5/8 1/8 3/8 3/8 5/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1-  
1/8 1/8 3/8 3/8 1/8 3/8 3/8 5/8 3/8 3/8 5/8 5/8 3/8 3/8 5/8 5/8 3/8 3/8 5/8 5/8 3/8 3/8 5/8 5/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1-  
1/8 1/8 3/8 5/8 1/8 3/8 5/8 5/8 3/8 3/8 5/8 5/8 3/8 3/8 5/8 5/8 3/8 3/8 5/8 5/8 3/8 3/8 5/8 5/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1-  
1/8 3/8 3/8 5/8 1/8 3/8 5/8 5/8 3/8 5/8 5/8 5/8 3/8 5/8 5/8 5/8 3/8 5/8 5/8 5/8 3/8 5/8 5/8 5/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1-  
1/8 3/8 5/8 5/8 1/8 3/8 5/8 5/8 3/8 5/8 5/8 5/8 3/8 5/8 5/8 5/8 3/8 5/8 5/8 5/8 3/8 5/8 5/8 5/8  
1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 1- 2- 1- 1- 1- 2- 1- 1- 1- 2-  
1/8 3/8 5/8 5/8 3/8 3/8 5/8 5/8 3/8 5/8 5/8 5/8 5/8 5/8 5/8 1/8 5/8 5/8 5/8 1/8 5/8 5/8 5/8 1/8  
1- 1- 1- 1- 1- 1- 1- 2- 1- 1- 1- 2- 1- 1- 2- 2- 1- 1- 2- 2- 1- 1- 2- 2-  
1/8 3/8 5/8 5/8 3/8 3/8 5/8 1/8 3/8 5/8 5/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8  
1- 1- 1- 2- 1- 1- 1- 2- 1- 1- 2- 2- 1- 1- 2- 2- 1- 2- 2- 2- 1- 1- 2- 2-  
3/8 3/8 5/8 1/8 3/8 5/8 5/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 1/8 1/8 1/8 5/8 5/8 1/8 1/8  
1- 1- 2- 2- 1- 1- 2- 2- 1- 2- 2- 2- 1- 2- 2- 2- 1- 2- 2- 2- 1- 2- 2- 2-  
3/8 5/8 1/8 1/8 3/8 5/8 1/8 1/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8  
1- 1- 2- 2- 1- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2-  
5/8 5/8 1/8 1/8 5/8 1/8 1/8 1/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8  
1- 2- 2- 2- 1- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2-  
5/8 1/8 1/8 1/8 5/8 1/8 1/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8  
1-  
7/8 7/8 7/8  
1/8  
1- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 3- 2- 2- 2- 3- 2- 2- 2- 3- 2- 2- 2- 3-  
5/8 1/8 1/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8  
1- 1-  
1/8 1/8  
7/8 7/8  
1- 2- 2- 2- 2- 2- 2- 2- 2- 2- 2- 3- 2- 2- 2- 3- 2- 2- 3- 3- 2- 2- 3- 3-  
5/8 1/8 1/8 5/8 1/8 1/8 5/8 5/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 1/8  
1- 1-  
1/8 1/8  
7/8 7/8  
2- 2- 2- 2- 2- 2- 2- 3- 2- 2- 3- 3- 2- 2- 3- 3- 2- 2- 3- 3- 2- 2- 3- 3-  
1/8 1/8 5/8 5/8 1/8 5/8 5/8 1/8 5/8 5/8 1/8 1/8 5/8 5/8 1/8 5/8 5/8 5/8 1/8 5/8 5/8 5/8 5/8 5/8  
1- 1- 1-  
1/8 1/8 3/8  
7/8  
2- 2- 2- 3- 2- 2- 2- 3- 2- 2- 3- 3- 2- 2- 3- 3- 2- 3- 3- 3- 2- 3- 3- 4- 1- 1- 1- 1-  
1/8 1/8 5/8 1/8 1/8 5/8 5/8 1/8 5/8 5/8 1/8 5/8 5/8 5/8 5/8 5/8 5/8 1/8 5/8 5/8 5/8 1/8 5/8 1/8 1/8 1/8 3/8 3/8  
2- 2- 3- 3- 2- 2- 2- 3- 2- 3- 3- 3- 2- 3- 3- 3- 3- 3- 4- 4- 3- 3- 4- 4- 1- 1- 1- 1-  
1/8 5/8 1/8 1/8 5/8 5/8 5/8 5/8 5/8 1/8 5/8 5/8 5/8 1/8 5/8 5/8 1/8 5/8 1/8 1/8 1/8 5/8 1/8 1/8 1/8 1/8 3/8 5/8  
2- 2- 3- 3- 2- 2- 3- 3- 3- 3- 3- 4- 3- 3- 3- 3- 3- 3- 4- 4- 3- 3- 4- 4- 1- 1- 1- 1-  
5/8 5/8 1/8 5/8 5/8 5/8 1/8 5/8 1/8 1/8 5/8 1/8 1/8 1/8 5/8 5/8 1/8 5/8 1/8 1/8 1/8 5/8 1/8 1/8 1/8 3/8 5/8 5/8  
600,000  
* NOTES:  
1. Sizes that are highlighted indicate maximum suction line sizes that should be used for risers. Riser size should not exceed horizontal size.  
Properly placed suction traps must also be used for adequate oil return.  
All sizes shown are for O.D. Type L copper tubing.  
2. Suction line sizes selected at pressure drop equivalent to 2˚F. Reduce estimate of system capacity accordingly.  
3. Recommended liquid line size may increase with reverse cycle hot gas systems.  
4. If system load drops below 40% of design, consideration to installing double suction risers should be made.  
1ꢀ  
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Evacuation and Leak Detection  
Due to the smaller molecule size of HFC’s, they will tend to leak more readily  
than CFC’s. Consequently, it is of the utmost importance that proper system  
evacuation and leak detection procedures be employed.  
Copeland recommends a minimum evacuation to 500 microns. In addition,  
a vacuum decay test is strongly recommended to assure there is not a  
large pressure differential between the system and vacuum pump. Good  
evacuation processes include frequent vacuum pump oil changes and large  
diameter, short hose connections to both high and low sides of the system  
preferably using bronze braided hose.  
Leak detection can be carried out in the conventional manner.  
If HCFC or CFC tracer gas is used, care must be taken to completely remove  
all traces of the gas prior to introducing HFC’s.  
Electronic leak detectors are now available that will sense HFC’s. This is  
considered preferable since it removes the possibility of chlorine remaining  
in the system after leak testing with HCFC’s and/or CFC’s. There is a view that  
even small quantities of chlorine may act as a catalyst encouraging copper  
plating and/or corrosion and should therefore be avoided.  
Repeat this operation a second time.  
Open the compressor service valves and evacuate the entire system to 500  
microns absolute pressure. Raise the pressure to 2 psig with the refrigerant  
and remove the vacuum pump.  
Refrigerant Charging Instructions  
1. Install a liquid line drier in the refrigerant supply line between the  
service gauge and the liquid service port of the receiver. This  
extra drier will insure that all refrigerant supplied to the  
system is clean and dry.  
2. When initially charging a system that is in a vacuum, liquid  
refrigerant can be added directly into the receiver tank.  
3. Check equipment catalog for refrigerant capacity. System  
refrigerant capacity is 90% of receiver capacity. Do not add more  
refrigerant than the data tag indicates, unless the line run exceeds  
25ft. Then, add additional refrigerant as per the chart on page 30.  
Weigh the refrigerant drum before charging so an accurate record  
can be kept of the weight of refrigerant put in the system.  
4. Start the system and finish charging until the sight glass indicates  
a full charge and the proper amount has been weighed in. If the  
refrigerant must be added to the system through the  
WARNING:  
HFC-134a has been shown to be combustible at pressure as low as 5.5  
psig (at 350˚F) when mixed with air at concentrations more than 60%  
air by volume.  
At lower temperature, higher pressures are required to support  
combustion. Therefore, air should never be mixed with HFC-134a for  
leak detection.  
suction side of the compressor, charge in vapor form only. Liquid  
charging must be done in the high side only or with  
liquid metering devices to protect the compressor.  
Within the last several years, manufacturers have developed fluorescent dye  
leak detection systems for use with refrigerants. These dyes mix with the  
lubricant and, when exposed to an ultraviolet light “fluoresce,indicates the  
location of leaks. Copeland has tested and approved the Rigid “System Safe”  
dye and found it to be compatible with the compressor materials in systems.  
Low Head Pressure Systems  
If you are charging the system by using a clear sight glass as an indication of  
proper charge the following must be considered.  
Check the condensing temperature. It must be above 105˚F. If not, it will be  
necessary to reduce the amount of air going through the condenser from  
fans still running. Simply reduce the effective condenser face area to raise the  
discharge pressure above the equivalent 105˚F condensing temperature and  
then proceed to charge to clear the sightglass. Adjust evaporator superheat  
at this time. Return to full condenser face area and allow the system to  
balance.  
Leak Testing  
After all lines are connected, the entire system must be leak tested. The  
complete system should be pressurized to not more than 150 psig with  
refrigerant and dry nitrogen (or dry CO2). The use of an electronic type leak  
detector is highly recommended because of its greater sensitivity to small  
leaks. As a further check it is recommended that this pressure be held for a  
minimum of 12 hours and then rechecked. For a satisfactory installation, the  
system must be leak tight.  
Field Wiring  
WARNING:  
Line Insulation  
After the final leak test, refrigerant lines exposed to high ambient conditions  
should be insulated to reduce heat pickup and prevent the formation of  
flash gas in the liquid lines. Suction lines must always be insulated with 3/4"  
wall Armstrong “Armaflexor equal. When required, Liquid lines should be  
insulated with 1/2 inch wall insulation or better. The insulation located in  
outdoor environments should be protected from UV exposure to prevent  
deterioration of insulating value.  
All wiring must be done in accordance with applicable codes and local  
ordinances.  
The field wiring should enter the areas as provided on the unit. The wiring  
diagram for each unit is located on the inside of the electrical panel door.  
All field wiring should be done in a professional manner and in accordance  
with all governing codes. Before operating unit, double check all wiring  
connections, including the factory terminals. Factory connections can vibrate  
loose during shipment.  
Evacuation  
CAUTION:  
1. The serial data tag on the unit is marked with the electrical characteristic  
for wiring the unit.  
2. Consult the wiring diagram in the unit cooler and in the condensing unit  
for proper connections.  
Do not use the refrigeration compressor to evacuate the system. Do  
not start the compressor while it is in a vacuum.  
A good, deep vacuum pump should be connected to both the low and high  
side evacuation valves with copper tube or high vacuum hoses (1/4" ID  
minimum). If the compressor has service valves, they should remain closed.  
A deep vacuum gauge capable of registering pressure in microns should be  
attached to the system for pressure readings.  
A shut off valve between the gauge connection and vacuum pump should  
be provided to allow the system pressure to be checked after evacuation. Do  
not turn off vacuum pump when connected to an evacuated system before  
closing shut off valve.  
The vacuum pump should be operated until a pressure of 1,500 microns  
absolute pressure is reached — at which time the vacuum should be broken  
with the refrigerant to be used in the system through a drier until the system  
pressure rises above “0psig.  
3. Wire type should be of copper conductor only and of the proper  
size to handle the connected load.  
4. The unit must be grounded.  
5. For multiple evaporator systems, the defrost termination controls  
should be wired in series. Follow the wiring diagrams for multiple  
evaporator systems carefully. This will assure complete defrost of  
all evaporators in the system.  
6. Multiple evaporator systems should operate off of one thermostat.  
7. If a remote defrost timer is to be used, the timer should be located  
outside the refrigerated space.  
8. For air cooled condensers, due to multiple low amp motors, we  
recommend using time delay fuse protection instead  
of circuit breakers.  
NOTE:  
Refrigerant used during evacuation cannot be vented. Reclaim all used  
refrigerant. EPA regulations are constantly being updated. Ensure your  
procedure follows correct regulations.  
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Check Out and Start Up  
After the installation has been completed, the following points should be  
covered before the system is placed in operation:  
a) Check all electrical and refrigerant connections.  
Be sure they are all tight.  
b) Observe compressor oil level before start-up. The  
oil level should be at or slightly above the 1/4 level  
of the sight glass. Refer to Table 3 for proper compressor oil.  
c)  
Remove upper mounting nuts on the compressor feet.  
Remove the shipping spacers. Install the neoprene washers onto  
the compressor feet. Replace the upper mounting nuts  
and washers, allowing 1/16" space between the mounting nut  
and the neoprene spacer.  
d) Check high and low pressure controls, pressure regulating valves,  
oil pressure safety controls, and all other safety controls, and  
adjust if necessary.  
e) Check the room thermostat for normal operation  
and adjust.  
f)  
Wiring diagrams, instruction bulletins, etc. attached to the  
condensing units should be read and filed for future reference.  
g) All fan motors should be checked for proper rotation. Fan  
motor mounts should be carefully checked for tightness and  
proper alignment.  
h) Electric and hot gas evaporator fan motors should  
be temporarily wired for continuous operation until  
the room temperature has stabilized.  
i)  
Observe system pressures during charging and initial operation.  
Do not add oil while the system is short of refrigerant  
unless oil level is dangerously low.  
j)  
Continue charging until system has sufficient refrigerant for  
proper operation. Do not overcharge.  
Remember that bubbles in a sight glass may be caused by  
a restriction as well as a shortage of refrigerant.  
k) Do not leave unit unattended until the system has  
reached normal operating conditions and the oil  
charge has been properly adjusted to maintain the oil  
level between 1/4 and bottom of the sight glass.  
l)  
Make sure all Schrader valve caps are in place and tight.  
m) Make sure ALL service valves are properly back-seated and tighten  
valve packing if necessary.  
CAUTION:  
Extreme care must be taken in starting compressors for the first time  
after system charging. At this time, all of the oil and most of the  
refrigerant might be in the compressor creating a condition which could  
cause compressor damage due to slugging. Activating the crankcase  
heater for 24 hours prior to start-up is required. If no crankcase heater is  
present, then directing a 500 watt heat lamp or other safe heat source on  
the lower shell of the compressor for approximately thirty minutes will be  
beneficial in eliminating this condition which might never reoccur.  
WARNING:  
Scroll compressor is directional dependent. If noisy, change phase of  
input wiring.  
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Operational Check Out  
System Balancing - Compressor Superheat  
IMPORTANT:  
After the system has been charged and has operated for at least two hours at  
normal operating conditions without any indication of malfunction, it should  
be allowed to operate overnight on automatic controls. Then a thorough  
recheck of the entire system operation should be made as follows:  
In order to obtain the maximum capacity from a system, and to ensure  
trouble-free operation, it is necessary to balance each and every system.  
a) Check compressor discharge and suction pressures.  
If not within system design limits, determine why and  
take corrective action.  
This is extremely important with any refrigeration system.  
The critical value which must be checked is suction superheat.  
Suction superheat should be checked at the compressor as follows:  
b) Check liquid line sight glass and expansion valve operation. If  
there are indications that more refrigerant is required, leak test  
all connections and system components and repair any  
leaks before adding refrigerant.  
1. Measure the suction pressure at the suction service valve of the  
compressor and determine the saturation temperature corresponding  
to this pressure from a “Temperature-Pressurechart.  
2. Measure the suction temperature of the suction line about one  
foot back from the compressor using an accurate thermometer.  
c)  
Observe oil level in compressor crankcase sight glass. Add oil as  
necessary to bring level to bottom 1/4 of the sight glass.  
d) Thermostatic expansion valves must be checked  
for proper superheat settings. Feeler bulbs must be  
in positive contact with the suction line and should  
be insulated. Valves set at high superheat will lower  
refrigeration capacity. Low superheat promotes  
liquid slugging and compressor bearing washout.  
3. Subtract the saturated temperature from the actual  
suction line temperature. The difference is superheat.  
Too low a suction superheat can result in liquid being returned to the  
compressor. This will cause dilution of the oil and eventual failure of the  
bearings and rings or in the extreme case, valve failure.  
Too high a suction superheat will result in excessive discharge temperatures  
which cause a break down of the oil and results in piston ring wear, piston  
and cylinder wall damage.  
It should also be remembered that the system capacity decreases as the  
suction superheat increases. For maximum system capacity, suction  
superheat should be kept as low as is practical. Copeland mandates a  
minimum superheat of 20˚F at the compressor. We recommend that the  
superheat at the compressor be between 20˚F and 30˚F.  
If adjustments to the suction superheat need to be made, the expansion  
valve at the evaporator should be adjusted.  
e) Using suitable instruments, carefully check line voltage and  
amperage at the compressor terminals. Voltage must be within  
10% of that indicated on the condensing unit nameplate. If high  
or low voltage is indicated, notify the power company.  
If amperage draw is excessive, immediately determine the cause  
and take corrective action. On three phase motor compressors,  
check to see that a balanced load is drawn  
by each phase.  
f)  
The maximum approved settings for high pressure controls on  
our air cooled condensing equipment is 425 psig. On air cooled  
systems, check as follows:  
Disconnect the fan motors or block the condenser inlet air. Watch  
high pressure gauge for cutout point. Recheck all safety and  
operating controls for proper operation and adjust if necessary.  
NOTE:  
g) Check defrost controls for initiation and termination settings, and  
length of defrost period. Set fail safe at length of defrost + 25%.  
All adjustable controls and valves must be field adjusted to meet desired  
operation. There are no factory preset controls or valve adjustments. This  
includes low pressure, high pressure, adjustable head pressure systems  
and expansion valves.  
Example:  
20 minute defrost + 5 minutes  
25 minute fail safe  
=
h) Check drain pan for proper drainage.  
i)  
j)  
Check winter head pressure controls for pressure setting.  
Check crankcase heater operation if used.  
k) Install instruction card and control system diagram for  
use of building manager or owner.  
Table 9. Recommended Low Pressure Control Settings for Outdoor Air Cooled Condensing Units  
*Minimum  
Temp. ˚F  
R-22  
R-ꢁ0ꢁA/R-507  
Cut-In PSI  
Cut-Out PSI  
Cut-In PSI  
Cut-Out PSI  
50  
40  
30  
10  
0
-10  
-20  
-30  
70  
55  
40  
30  
15  
15  
10  
6
20  
20  
20  
10  
0
0
0
0
90  
70  
55  
45  
25  
20  
12  
8
35  
35  
35  
25  
7
1
1
1"Hg.  
* Minimum ambient or box temperature anticipated, high pressure control setting: R-22, 360 PSI; R-404A, R-507, 400 PSI  
* The standard preset low pressure switch used for pumpdown is set for 15 PSI cut in / 4 PSI cut out and is a good setting for most pumpdown systems  
* ZB Scroll compressors should be set for 25 PSI cut in / 17 PSI cut out (R-404A / R-507)  
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General Sequence of Operation  
Electric Defrost Troubleshooting  
The electric defrost units are relatively simple and trouble-free in operation:  
Refrigeration Cycle  
Timer  
1. Power is supplied to the timer at terminals “1and “N.  
If the system does not go through its proper sequence , check timer  
operation through a defrost cycle. Check for loose wires or terminals. Before  
replacing timer, check other components.  
2. The fan delay and the defrost termination thermostat is closed in the fan  
delay position and open in the defrost termination position.  
The unit cooler fans run continuously.  
3. The defrost heaters are off.  
4. The room thermostat closes when the temperature rises above the  
desired setting.  
5. The liquid line solenoid is energized and opens, which allows  
liquid refrigerant to flow through the unit cooler.  
6. The low pressure control closes when the suction pressure rises  
above the cutin setting of the control.  
Operation of Paragon Timer  
To set time of day grasp knob which is in the center of the inner (fail-safe) dial  
and rotate it in a counter-clockwise direction. This will cause the outer (24  
hour) dial to revolve. Line up the correct time of day on the outer dial with  
the time pointer. Do not try to set the time control by grasping the other (24  
hour) dial. Place pins in the outer dial at the time of day that defrost  
is required.  
7. On systems with oil pumps, the oil safety control is closed. If the  
net oil pressure is less than 9 PSIG for more than 120  
seconds, the oil safety opens, thus breaking the circuit  
to the compressor contactor holding coil. The compressor will  
not operate. This control is reset manually and must be  
reset before the compressor can be restarted.  
8. The compressor contactor closes. The compressor and condenser  
fan start simultaneously.  
9. The room temperature gradually decreases to the desired temperature.  
10. Once the desired temperature is reached, the thermostat opens and the  
liquid line solenoid closes, stopping refrigerant flow through  
the evaporator.  
11. Suction pressure decreases and the compressor contactor opens  
when the pressure drops below the cutout setting on the low  
pressure control. The compressor and condenser fan stop running.  
Operation of Grasslin Timer  
To set the time, turn the minute hand clockwise until the time of day (and  
AM or PM) on the outer dial is aligned with the triangle marker on the inner  
dial. Do not rotate minute hand counter-clockwise. Move the white tab  
(tripper) on the outer dial outward at each desired initiation time. Each white  
tab (tripper) is a 15 minute interval and provides 15 minutes of defrost. For  
longer defrost duration, move additional tabs (following in time) from the  
initiation tab. For example, if a 45 minute defrost is to start at 7:00 AM, move  
the tabs outward that lie between 7:00 - 7:15, 7:15 - 7:30 and 7:30 - 7:45 on  
the AM side of the dial. The defrost will initiate at 7:00 AM and time terminate  
at 7:45 AM (if temperature termination does not occur first). For models with  
plastic cover on timer assembly; re-install cover after adjustment.  
12. This cycle is repeated as many times as necessary to satisfy the  
room thermostat.  
13. Frost starts to form on the evaporator coil and continues to form  
until the defrost cycle is initiated.  
Defrost Cycle  
1. The defrost cycle starts automatically by the timer at predetermined  
times. Typical settings are two to four defrost cycles per day for freezers.  
For heavier frost loads additional settings may be required.  
2. Switch “2to “4opens in the timer which breaks the circuit to the room  
thermostat, liquid line solenoid, and evaporator fan motors, allowing  
the compressor to pump down and shut off. Simultaneously  
switch “1to “3closes in the timer allowing current to flow to one side  
of the defrost heater contactor. When the compressor  
NOTE:  
After correcting faulty condition it is essential that the coil and unit be  
free of ice before placing unit back on automatic operation.  
shuts off, an auxiliary contact will send power to the contactor holding  
coil; thus, energizing the defrost heaters.  
3. The heaters raise the temperature of the coil to 32˚F causing the frost to  
melt off the coil.  
4. When the coil warms to 45˚F to 55˚F, the defrost termination thermostat  
closes, which allows current to the switching solenoid in the timer  
allowing the refrigeration cycle to begin again.  
5. The evaporator heaters are off. If the termination thermostat fails to  
close, the fail-safe set on the timer will terminate defrost.  
6. The low pressure control closes and the compressor will start.  
NOTES:  
1. Lockout relays or normally closed switch of auxiliary contact on the  
compressor contactor may be wired to defrost contactor. Its purpose  
is to prevent energizing of the defrost heaters until the compressor has  
pumped down and stopped, thus keeping power demand to a minimum.  
2. If the control voltage is to remain energized for any period of time with  
the compressor disabled, remove the defrost clock pins to prevent the  
defrost heaters from energizing.  
3. A Preventative Maintenance schedule should be set up as soon as  
possible after start-up to maintain equipment integrity.  
7. When the coil temperature reaches 23˚F to 30˚F, the fan  
delay closes. This allows the current to flow to the fan  
motors. The fan motors start running.  
8. The system will now operate in the refrigeration cycle until another  
defrost period is initiated by the timer.  
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Table 10. System Troubleshooting Chart  
PROBLEM  
POSSIBLE CAUSES  
POSSIBLE CORRECTIVE STEPS  
Compressor will not 1. Main switch open.  
1. Close switch.  
run  
2. Fuse blown.  
2. Check electrical circuits and motor winding for shorts or grounds.  
Investigate for possible overloading. Replace fuse after fault is corrected.  
3. Overloads are automatically reset. Check unit closely when unit  
comes back on line.  
3. Thermal overloads tripped.  
4. Repair or replace.  
5. Determine type and cause of shutdown and correct it before  
resetting safety switch.  
6. None. Wait until calls for cooling.  
7. Repair or replace coil.  
8. Check motor for open windings, short circuit or burn out.  
9. Check all wire junctions. Tighten all terminal screws.  
10. Refer to page 17.  
4. Defective contactor or coil.  
5. System shut down by safety devices.  
6. No cooling required.  
7. Liquid line solenoid will not open.  
8. Motor electrical trouble.  
9. Loose wiring.  
10. Phase loss monitor inoperative.  
Compressor noisy or 1. Flooding of refrigerant into crankcase.  
1. Check setting of expansion valves.  
2. Relocate, add or remove hangers.  
3. Replace.  
vibrating  
2. Improper piping support on suction or liquid line.  
3. Worn compressor.  
4. Scroll compressor rotation reversed.  
4. Rewire for phase change.  
High discharge  
pressure  
1. Non-condensables in system.  
2. System overcharges with refrigerant.  
3. Discharge shutoff valve partially closed.  
4. Fan not running.  
5. Head pressure control setting.  
6. Dirty condenser coil.  
1. Remove the non-condensables.  
2. Remove excess.  
3. Open valve.  
4. Check electrical circuit.  
5. Adjust.  
6. Clean.  
Low discharge  
pressure  
1. Faulty condenser temperature regulation.  
2. Suction shutoff valve partially closed.  
3. Insufficient refrigerant in system.  
4. Low suction pressure.  
1. Check condenser control operation.  
2. Open valve.  
3. Check for leaks. Repair and add charge.  
4. See corrective steps for low suction pressure.  
5. Check valve setting.  
5. Variable head pressure valve.  
High suction  
pressure  
1. Excessive load.  
2. Expansion valve overfeeding.  
1. Reduce load or add additional equipment.  
2. Check remote bulb. Regulate superheat.  
Low suction pressure 1. Lack of refrigerant.  
2. Evaporator dirty or iced.  
1. Check for leaks. Repair and add charge.  
2. Clean.  
3. Clogged liquid line filter drier.  
3. Replace cartridge(s).  
4. Clogged suction line or compressor suction gas strainers. 4. Clean strainers.  
5. Expansion valve malfunctioning.  
6. Condensing temperature too low.  
7. Improper TXV.  
5. Check and reset for proper superheat.  
6. Check means for regulating condensing temperature.  
7. Check for proper sizing.  
Little or no oil  
pressure  
1. Clogged suction oil strainer.  
2. Excessive liquid in crankcase.  
1. Clean.  
2. Check crankcase heater. Reset expansion valve for higher superheat.  
Check liquid line solenoid valve operation.  
3. Replace.  
3. Low oil pressure safety switch defective.  
4. Worn oil pump.  
5. Oil pump reversing gear stuck in wrong position.  
6. Worn bearings.  
7. Low oil level.  
8. Loose fitting on oil lines.  
9. Pump housing gasket leaks.  
4. Replace.  
5. Reverse direction of compressor rotation.  
6. Replace compressor.  
7. Add oil and/or through defrost.  
8. Check and tighten system.  
9. Replace gasket.  
Compressor loses oil 1. Lack of refrigerant.  
2. Excessive compression ring blow by.  
1. Check for leaks and repair. Add refrigerant.  
2. Replace compressor.  
3. Maintain proper superheat at compressor.  
4. Correct piping.  
3. Refrigerant flood back.  
4. Improper piping or traps.  
Compressor thermal 1. Operating beyond design conditions.  
protector switch  
1. Add components to bring conditions within acceptable limits (i.e.,  
CPR/EPR valves, additional condenser surface, liquid injection, etc.).  
open  
2. Open valve.  
3. Replace gasket.  
4. Clean coil.  
2. Discharge valve partially shut.  
3. Blown valve plate gasket.  
4. Dirty condenser coil.  
5. Overcharged system.  
5. Reduce charge.  
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Preventive Maintenance  
Unit Coolers  
At every six month interval, or sooner if local conditions cause clogging  
or fouling of air passages through the finned surface, the following items  
should be checked.  
• Check moisture indicator/sightglass for flash gas. If found check  
entire system for refrigerant leaks and add refrigerant as needed after  
repairing any leaks.  
• Check compressor sightglass (if equipped) for proper oil level.  
• Check condition of condenser. Look for accumulation of dirt and debris  
(clean as required).  
• Check for unusual noise or vibration. Take corrective action as required.  
• Inspect wiring for signs of wear or discoloration and repair if needed.  
• Check and tighten all flare connections.  
1) Visually inspect unit  
• Look for signs of corrosion on fins, cabinet, copper tubing and  
solder joints.  
• Look for excessive or unusual vibration for fan blades or sheet metal  
panels when in operation. Identify fan cell(s) causing vibration and  
check motor and blade carefully.  
Semi-Annually  
2) Repeat all quarterly inspection items.  
• Look for oil stains on headers, return bends, and coil fins. Check any  
suspect areas with an electronic leak detector.  
• Check drain pan to insure that drain is clear of debris,  
obstructions or ice buildup and is free draining.  
3) Clean condenser coil and blades  
• Periodic cleaning can be accomplished by using a brush, pressurized  
water and a commercially available foam coil cleaner. If foam cleaner is  
used, it should not be an acid based cleaner. Follow label directions for  
appropriate use.  
2) Clean evaporator coil and blades  
• Periodic cleaning can be accomplished by using a brush, pressurized  
water or a commercially available evaporator coil cleaner or mild  
detergent. Never use an acid based cleaner. Follow label directions for  
appropriate use. Be sure the product you use is approved for use in  
your particular application.  
• Flush and rinse coil until no residue remains.  
• Pay close attention to drain pan, drain line and trap.  
• Rinse until no residue remains.  
4) Check operation of condenser fans  
• Check that each fan rotates freely and quietly. Replace any fan motor  
that does not rotate smoothly or makes excessive noise.  
• Check all fan blade set screws and tighten as required.  
• Check all fan blades for signs of cracks, wear or stress. Pay close  
attention to the hub and spider. Replace blades as required.  
• Verify that all motors are mounted securely.  
• Lubricate motors if applicable. Do not lubricate permanently sealed,  
ball bearing motors.  
3) Check the operation of all fans and ensure airflow is  
unobstructed  
• Check that each fan rotates freely and quietly. Replace any fan motor  
that does not rotate smoothly or makes an unusual noise.  
• Check all fan set screws and tighten if needed.  
• Check all fan blades for signs of stress or wear.  
Replace any blades that are worn, cracked or bent.  
• Verify that all fan motors are securely fastened to the motor rail.  
• Lubricate motors if applicable.  
5) Inspect electrical wiring and components  
• Verify that all electrical and ground connections are secure, tighten as  
required.  
• Check condition of compressor and heater contactors. Look for  
discoloration and pitting. Replace as required.  
• Check operation and calibration of all timers, relays pressure controls  
and safety controls.  
• Clean electrical cabinet. Look for signs of moisture, dirt, debris, insects  
and wildlife. Take corrective action as required.  
• Verify operation of crankcase heater by measuring amp draw.  
4) Inspect electrical wiring and components  
• Visually inspect all wiring for wear, kinks, bare areas and discoloration.  
Replace any wiring found to be damaged.  
• Verify that all electrical and ground connections are secure, tighten  
if necessary.  
• Check operation/calibration of all fan cycle and defrost controls  
when used.  
• Look for abnormal accumulation of ice patterns and adjust defrost  
cycles accordingly  
• Compare actual defrost heater amp draw against unit data plate.  
• Visually inspect heaters to ensure even surface contact with the coil. If  
heaters have crept, decrease defrost termination temperature and be  
sure you have even coil frost patterns. Re-align heaters as needed.  
• Check drain line heat tape for proper operation (supplied and installed  
by others).  
6) Check refrigeration cycle  
• Check suction, discharge and net oil pressure readings. If abnormal take  
appropriate action.  
• Check operation of demand cooling, liquid injection or unloaders if so  
equipped.  
• Check pressure drop across all filters and driers. Replace as required.  
• Verify that superheat at the compressor conforms to specification. (30°F  
to 45°F)  
• Check pressure and safety control settings and verify proper operation.  
5) Refrigeration Cycle  
• Check unit cooler superheat and compare reading for your specific  
application  
Annually  
• Visually inspect coil for even distribution  
7) In addition to quarterly and semiannual maintenance checks, submit an  
oil sample for analysis  
Air-Cooled Condensing Units  
• Look for high concentrations of acid or moisture. Change oil and driers  
until test results read normal.  
• Investigate source of high metal concentrations, which normally  
are due to abnormal bearing wear. Look for liquid refrigerant in the  
crankcase, low oil pressure or low superheat as a possible source.  
Quarterly  
1) Visually inspect unit  
• Look for signs of oil stains on interconnection piping and condenser  
coil. Pay close attention to areas around solder joints, building  
penetrations and pipe clamps. Check any suspect areas with an  
electronic leak detector. Repair any leaks found and add refrigerant as  
needed.  
• Check condition of moisture indicator/sightglass in the sight glass if  
so equipped. Replace liquid line drier if there is indication of slight  
presence of moisture. Replace refrigerant, oil and drier if moisture  
concentration is indicated to be high.  
8) Inspect suction accumulator (if equipped)  
• If the accumulator is insulated remove insulation and inspect for leaks  
and corrosion.  
• Pay close attention to all copper to steel brazed connections  
• Wire brush all corroded areas and peeling paint.  
• Apply an anticorrosion primer and paint as required. Re-insulate if  
applicable.  
19  
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Diagram ꢀ. Typical Wiring Diagram for Single Evaporator with and without Defrost Timer  
Diagram ꢁ. Typical Wiring Diagram for Single Evaporator with Defrost Timer Only  
20  
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Diagram 5. Typical Wiring Diagram for Multiple Evaporators with Defrost Timer Only  
Diagram ꢂ. Typical Wiring Diagram for Single Evaporator / Single Phase Defrost and Evaporator Fan Contactors  
21  
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Diagram 7. Typical Wiring Diagram for Single Evaporator Defrost and Evaporator Fan Contactors  
Diagram 8. Typical Wiring Diagram for Multiple Evaporators with Evaporator Fan Contactors/without Heater Limit Defrost  
22  
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Diagram 9. Typical Wiring Diagram for Multiple Evaporators with Heater Limit Defrost and Evaporator Fan Contactors  
Diagram 10. Typical Wiring Diagram for Multiple Evaporators Defrost and Evaporator Fan Contactors  
with Unit Cooler Holdout Relay  
2ꢀ  
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Replacement Parts by  
Commercial Refrigeration Parts  
InterLink™ Comercial Refrigeration Parts is your link to a complete line of dependable and certified commercial refrigeration parts, accessories  
and innovative electronic controls for all Heatcraft Refrigeration Products (HRP) brands - including Bohn, Larkin, Climate Control and Chandler.  
At InterLink, we provide our wholesalers with a comprehensive selection of product solutions and innovative technologies for the installed  
customer base. And every product is built to ensure the same high performance standards with which all HRP brands are built — backed by  
a dedicated team to serve every customer need, delivering at the best lead times in the industry.  
Replacement parts should be obtained from your local InterLink wholesaler. Replacement parts, which are covered under the terms of  
the warranty statement on page 2 of this manual, will be reimbursed for total part cost only. The original invoice from the parts supplier  
must accompany all warranty claims for replacement part reimbursement. Heatcraft Refrigeration Products reserves the right to adjust the  
compensation amount paid on any parts submitted for warranty reimbursement when a parts supplier's original invoice is not provided with  
For our complete Refrigeration Systems Installation and Operations Manual (H-IM-ꢂꢁL),  
Since product improvement is a continuing effort, we reserve the right to make changes in  
specifications without notice.  
The name behind the brands you trust.™  
CLIMATE  
Commercial Refrigeration Parts  
CONTROL  
Download from Www.Somanuals.com. All Manuals Search And Download.  
H-IM-CU-0808  

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