Nordyne Heat Pump T3BN User Manual

Outdoor Heat Pump  
User’s Information and Installation Instructions  
T3BN Series High Efficiency Commercial Split System  
These units have been designed and tested for capacity and efficiency in accor-  
dancewithA.R.I.Standards.SplitSystemHeatPumpunits,whencombinedwith  
our air handlers, offer a high quality, matched heating and cooling system.  
These instructions are primarily intended to assist qualified individuals expe-  
rienced in the proper installation of heating and/or air conditioning appliances.  
Some local codes require licensed installation/service personnel for this type of  
equipment. Read all instructions carefully before starting the installation.  
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normal, and the unit will periodically defrost  
itself. During the defrost cycle, the outdoor  
fanwillstop,andthecompressorwillcontinue  
to run and heat the outdoor coil, causing the  
snow and ice to melt. After the snow and ice  
have melted, some steam may rise from the  
outdoor unit as the warm coil causes some  
melted frost to evaporate.  
TO MAINTAINYOUR HEAT PUMP—  
CAUTION:  
Be certain the electrical power to  
the outdoor unit and the furnace/air  
handler is disconnected before  
doing the following recommended  
maintenance.  
TO OPERATEYOUR HEAT PUMP  
FOR AUTOMATIC COOLING AND  
HEATING—  
1. Regularly:  
a. Clean or replace the indoor air filter at the  
start of each heating and cooling season,  
and when an accumulation of dust and  
dirt is visible on the air filter. Inspect the  
filter monthly.  
1. Set the thermostat system switch to AUTO  
and the thermostat fan switch to AUTO.(See  
Figure 1)  
Note: Thermostats will vary. Some models  
will not include the AUTO mode, and others  
will have the AUTO in place of the HEAT and  
COOL, and some will include all three.  
b. Remove any leaves and grass clippings  
from the coil in the outdoor unit, being  
careful not to damage the aluminum  
fi n s .  
2. Set the thermostat temperature to the  
desired heating and cooling temperature  
level(s). The outdoor unit and the indoor  
blower will then cycle on and off in either  
the heating or cooling mode of operation as  
requiredtoautomaticallymaintaintheindoor  
temperature within the desired limits.  
c. Check for any obstruction such as twigs,  
sticks, etc.  
d. Certain models have external panels  
fabricated from a premium grade  
of steel designed to inhibit cor-  
rosion. For such units, if the unit is  
located in a coastal region or other area  
subjected to high concentrations of salt,  
then the unit should be hosed off after  
stormsandmonthlyotherwisetomaintain  
its new appearance.  
TO SHUT OFFYOUR HEAT  
PUMP—  
SetthethermostatsystemswitchtoOFFandthe  
thermostat fan switch to AUTO. (See Figure 1)  
The system will not operate, regardless of the  
thermostat temperature selector(s) setting.  
CAUTION:  
TO OPERATE THE INDOOR  
BLOWER CONTINUOUSLY—  
Do not over-oil, or oil motors not  
factory-equipped with oil tubes. The  
compressor is hermetically “sealed”  
and does not require lubrication.  
Set the thermostat fan switch to ON (See Figure  
1).The indoor blower will start immediately, and  
will run continually until the fan switch is reset  
to AUTO.  
2. Before Calling a Service Technician, Be  
Certain:  
The continuous indoor blower operation can be  
obtained with the thermostat system switch set  
in any position, including OFF.  
a. The unit thermostat is properly set—see  
To OperateYour Heat Pump for Cooling”  
and “To Operate Your Heat Pump for  
Heating.”  
The continuous indoor blower operation is  
typically used to circulate the indoor air to  
equalize a temperature unbalance due to a sun  
load, cooking, or fireplace operation.  
b. The unit disconnect fuses are in good  
condition, and the electrical power to the  
unit is turned on.  
3
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ReadYour Warranty  
theinstructionsprovidedwiththeequipmentprior  
to performing the installation and operational  
checkout of the equipment.  
Please read the separate warranty document  
completely. It contains valuable information  
about your system.  
BrazingOperationsInstallationofequipment  
may require brazing operations. Safety codes  
must be complied with. Safety equipment (e.g.;  
safety glasses, work gloves, fire extinguisher,  
etc.) must be used when performing brazing  
operations.  
GENERAL INFORMATION  
Readthefollowinginstructionscompletelybefore  
performing the installation.  
Outdoor Unit Section — Each outdoor unit is  
shipped with a refrigerant holding charge.  
WARNING:  
NOTE: DO NOT USE ANY PORTION OF  
THE CHARGE FOR PURGING OR LEAK  
TESTING.  
Ensure all electrical power to the unit  
is off prior to installing or servicing the  
equipment.Failure to do so may cause  
personal injury or death.  
Matching indoor coils and air handlers may be  
shippedwithasmallholdingchargetopressurize  
them to keep out contaminants. To release the  
pressure, read the indoor section installation  
instructions carefully.  
SITE PREPARATION  
Unpacking Equipment — Remove the  
cardboard carton and User’s Manual from the  
equipment. Take care to not damage tubing  
connections when removing from the carton.  
Liquid and Suction Lines — Fully annealed,  
refrigerant grade copper tubing should be used  
when installing the system. Refrigerant suction  
line tubing should be fully insulated.  
Inspect for Damage — Inspect the equipment  
for damage prior to installing the equipment at  
the job site. Ensure coil fins are straight and, if  
necessary, comb fins to remove flattened and  
bent fins.  
Field Connections for Electrical Power  
Supply — All wiring must comply with current  
provisions of the “National Electrical Code”  
(ANSI/NFPA 70) and with applicable local  
codes having jurisdiction. The minimum size of  
electrical conductors and circuit protection must  
be in compliance with information listed on the  
outdoor unit data label.  
Preferred Location of the Outdoor Unit at the  
Job Site — Conduct a survey of the job site to  
determine the optimum location for mounting  
the outdoor unit. Overhead obstructions,  
poorly ventilated areas, and areas subject to  
accumulation of debris should be avoided. The  
outdoor unit should be installed no closer than  
18 inches from the outside walls of the facility  
and in an area free from overhead obstructions  
to ensure unrestricted airflow through the  
outdoor unit.  
SAFETY CONSIDERATIONS  
Pressures within the System — Split  
system heat pump equipment contains liquid  
and gaseous refrigerant under pressure.  
Installation and servicing of this equipment  
should be accomplished by qualified, trained  
personnel thoroughly familiar with this type of  
equipment. Under no circumstances should the  
Homeowner attempt to install and/or service  
the equipment.  
Facility Prerequisites — Electrical power  
supplied must be adequate for proper operation  
oftheequipment.Thesystemmustbewiredand  
provided with circuit protection in accordance  
with local building codes and the National  
Electrical Code.  
Labels, Tags, Precautions — When working  
with this equipment, follow all precautions in the  
literature, on tags, and on labels provided with  
theequipment.Readandthoroughlyunderstand  
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The maximum recommended interconnecting  
refrigerant line length is 75 feet, and the  
vertical elevation difference between the indoor  
and outdoor sections should not exceed 20  
feet. Consult long line application guide for  
installations in excess of these limits.  
INSTALLING THE OUTDOOR UNIT  
SlabMountThesiteselectedforaslabmount  
installation requires a stable foundation and one  
not subject to erosion. The slab should be level  
and anchored (if necessary) prior to placing the  
equipment on the slab.  
Filter Dryer Installation — A filter dryer is  
provided with the unit and installed inside the  
outdoor unit.  
Cantilever Mount — The cantilever mount  
should be designed with adequate safety factor  
to support the weight of the equipment, and for  
loads subjected to the mount during operation.  
Installed equipment should be adequately  
secured to the cantilever mount and levelled  
prior to operation of the equipment.  
Optional Equipment — Optional equipment  
(e.g.: liquid line solenoid valves, etc.) should  
be installed in strict accordance with the  
manufacturer’s installation instructions.  
Roof Mount The method of mounting should  
bedesignedsoasnottooverloadroofstructures  
nor transmit noise to the interior of the structure.  
Refrigerant and electrical line should be routed  
through suitably waterproofed openings to  
prevent water leaking into the structure.  
ELECTRICAL CONNECTIONS  
WARNING:  
Turnoffallelectricalpoweratthemain  
circuit box before wiring electrical  
power to the outdoor unit. Failure to  
comply may cause severe personnel  
injury or death.  
INSTALLING THE INDOOR UNIT  
The indoor section should be installed before  
proceeding with routing of refrigerant piping.  
ConsulttheInstallationInstructionsoftheindoor  
unit (i.e.: air handler, furnace, etc.) for details  
regarding installation.  
Wiring Diagram/Schematic — A wiring  
diagram/schematicislocatedontheinsidecover  
of the electrical box of the outdoor unit. The  
installer should become familiar with the wiring  
diagram/schematicbeforemakinganyelectrical  
connections to the outdoor unit.  
CONNECTING REFRIGERANT  
TUBING BETWEEN THE INDOOR  
AND OUTDOOR UNIT  
General — Once outdoor and indoor unit  
placementhasbeendetermined,routerefrigerant  
tubingbetweentheequipmentinaccordancewith  
sound installation practices. Refrigerant tubing  
should be routed in a manner that minimizes the  
length of tubing and the number of bends in the  
tubing. Refrigerant tubing should be supported  
in a manner that the tubing will not vibrate or  
abrade during system operation.Tubing should  
bekeptcleanofforeigndebrisduringinstallation  
and installation of a liquid line filter drier is  
recommended if cleanliness or adequacy of  
systemevacuationisunknownorcompromised.  
Every effort should be made by the installer  
to ensure that the field installed, refrigerant  
containingcomponentsofthesystemhavebeen  
installed in accordance with these instructions  
and sound installation practices so as to insure  
reliable system operation and longevity.  
Outdoor Unit Connections — The outdoor  
unit requires both power and control circuit  
electrical connections. Refer to the unit wiring  
diagram/schematicforidentificationandlocation  
of outdoor unit field wiring interfaces.  
Control Circuit Wiring — The outdoor unit is  
designedtooperatefroma24VACClassIIcontrol  
circuit. Control circuit wiring must comply with  
the current provisions of the “National Electrical  
Code(ANSI/NFPA70)andwithapplicablelocal  
codes having jurisdiction.  
Thermostat connections should be made in  
accordance with the instructions supplied with  
thethermostat,andwiththeinstructionssupplied  
with the indoor equipment.A typical commercial  
installation with a heat pump thermostat and air  
handler are shown on the next page.  
5
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Electrical Power Wiring — Electrical power  
wiring must comply with the current provisions  
of the “National Electrical Code” (ANSI/NFPA  
70) and with applicable local codes having  
jurisdiction. Use of rain tight conduit is  
recommended. Electrical conductors shall have  
minimumcircuitampacityincompliancewiththe  
outdoorunitratinglabel.Thefacilityshallemploy  
electrical circuit protection at a current rating no  
greater than that indicated on the outdoor unit  
rating label. Refer to the unit wiring diagram for  
connection details.  
Optional Equipment (e.g.: liquid line solenoid  
valves,refrigerantcompressorcrankcaseheater,  
etc.)shouldbeinstalledinstrictaccordancewith  
the manufacturer’s installation instructions.  
STARTUP AND CHECKOUT  
WARNING:  
Ensure electrical power to the unit is  
off prior to performing the following  
steps. Failure to do so may cause  
personal injury or death.  
Minimum Circuit Ampacity — Electrical wiring  
to the equipment must be compatible and in  
compliance with the minimum circuit ampacity  
listed on the outdoor unit data label.  
Air Filters — Ensure air filters are clean and in  
MaximumFuse/CircuitBreakerSizeCircuit  
protectionfortheoutdoorunitmustbecompatible  
withthemaximumfuse/circuitbreakersizelisted  
on the outdoor unit data label.  
place prior to operating the equipment.  
ThermostatSettheroomthermostatfunction  
switchtoOFF,fanswitchtoAUTO,andadjustthe  
temperature setpoint to its highest setting.  
DisconnectSwitchAnelectricallycompatible  
disconnect switch must be within line of sight of  
the outdoor unit.This switch shall be capable of  
electrically de-energizing the outdoor unit.  
Prior to applying electrical power to the outdoor  
unit, ensure that the unit has been properly and  
securely grounded, and that power supply  
connections have been made at both the facility  
power interface and outdoor unit.  
Optional Equipment — Optional equipment  
requiring connection to the power or control  
circuits must be wired in strict accordance with  
current provisions of the “National Electrical  
Code” (ANSI/NFPA 70), with applicable local  
codes having jurisdiction, and the installation  
instructions provided with the equipment.  
Outdoor Unit — Ensure the outdoor coil and  
top of the unit are free from obstructions and  
debris, and all equipment access/control panels  
are in place.  
Using extreme caution, apply power to the unit  
and inspect the wiring for evidence of open,  
shorted, and/or improperly wired circuits.  
COPPER WIRE SIZE — AWG  
(1% Voltage Drop)  
Functional Checkout:  
Supply Wire Length-Feet Supply Circuit  
200  
6
150  
8
100  
10  
8
50  
14  
12  
10  
10  
8
Ampacity  
15  
CAUTION:  
4
6
20  
If equipped with a compressor  
crankcase heater, wait 24 hours prior  
to performing a function checkout to  
allow for heating of the compressor  
crankcase. Failure to comply may  
result in damage and could cause  
premature failure of the system.  
4
6
8
25  
4
4
6
30  
3
4
6
35  
3
4
6
8
40  
2
3
4
6
45  
2
3
4
6
50  
Wire Size based on N.E.C. for 60° type copper  
conductors.  
6
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Thermostat  
G
R W C E O Y  
2
NOTE: Jumper  
betweenW2 and E is  
required when no OD  
T-Stat is used.  
C & W2 to be connected  
to Electric Heat.  
R
Y
R
Y
O
O
W
1
W
C
2
W
2
C
G
Air Handler  
Heat Pump OD  
Section  
Typical Heat Pump with Standard Air Handler  
7
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Indoor Blower — Set the thermostat function  
switch to COOLING and the fan switch to ON.  
Verify that the indoor blower is operating and  
that airflow is not restricted. Set the fan switch  
back to AUTO.  
indoor blower have energized.Feel the air being  
circulated by the indoor blower and verify that  
it is warmer than ambient temperature. Listen  
for any unusual noises. If present, locate and  
determine the source of the noise and correct  
as necessary.  
Low-PressureSwitchAlow-pressureswitch  
is factory-installed (see attached). This switch  
is located in the suction line internal to the out-  
door unit. The switch is designed to protect the  
compressor from a loss of charge.Under normal  
conditions, the switch is closed. If the suction  
pressure falls below 5 psig, then the switch will  
open and de-energize the outdoor unit. The  
switchwillcloseagainoncethesuctionpressure  
increases above 20 psig. Please note that the  
switchinterruptsthethermostatinputstotheunit.  
Thus, when the switch opens and then closes,  
therewillbea5minuteshortcyclingdelaybefore  
the outdoor unit will energize.  
NOTE: Other sources for heating (i.e.: electric  
furnace, fossil fuel furnace, air handler with  
electric heat options, etc.) that interface with  
the unit should be functionally checked to verify  
system operation and compatibility. Refer to the  
installation instructions for this equipment and  
perform a functional checkout in accordance  
with the manufacturer’s instructions.  
Defrost CycleTimer — The defrost cycle timer  
controls the accumulated run time interval of  
the hot gas defrost after the defrost sensor  
closes. It is located in the upper right corner of  
the defrost control board.Three interval settings  
are available: 30 minutes, 60 minutes, and 90  
minutes.Time setting selection is dependent on  
the climate where the unit is being installed.The  
defaultdefrostcycletimerissetto30minutes.To  
adjust the cycle time, move the jumper to cover  
the two pins directly adjacent to the desired  
cycle time.  
Cooling — Gradually lower the thermostat  
temperature setpoint below the actual room  
temperature and observe that the outdoor unit  
and indoor blower energize. Feel the air being  
circulated by the indoor blower and verify that  
it is cooler than ambient temperature. Listen  
for any unusual noises. If present, locate and  
determine the source of the noise and correct  
as necessary.  
Example 1. Dry climate of Southern  
Arizona. A 90 minute setting is  
recommended.  
Short Cycle Protection — With the system  
operating in COOLING mode, note the setpoint  
temperature setting of the thermostat, and  
gradually raise the setpoint temperature until  
the outdoor unit and indoor blower de-energize.  
Immediately lower the setpoint temperature of  
the thermostat to its original setting and verify  
that the indoor blower is energized and that the  
outdoor unit remains de-energized. Verify that,  
after approximately 5 minutes, the outdoor unit  
energizes and that the temperature of the air  
supplied to the facility is cooler than ambient  
temperature.  
Example 2. Moist climate of Seattle,  
Washington. A 30 minute setting is  
recommended.  
High-Pressure Switch — A high-pressure  
switchisfactory-installedandlocatedintheliquid  
line internal to the outdoor unit. The switch is  
designed to protect the system when very high  
pressures occur during abnormal conditions.  
Under normal conditions, the switch is closed.  
If the liquid pressure rises above 425 psig, then  
theswitchwillopenandde-energizetheoutdoor  
unit. The switch will close again once the liquid  
pressure decreases to 350 psig.Thus, when the  
switch opens and then closes, there will be a 5  
minute short cycling delay before the outdoor  
unit will energize.  
Heating — Lower the thermostat setpoint  
temperature to the lowest obtainable setting and  
set the thermostat function switch to HEATING.  
The indoor blower and outdoor unit should stop  
running.Afteraminimumofveminutes,increase  
the setpoint temperature of the thermostat to the  
maximumsetting.Verifythattheoutdoorunitand  
DEFROST CONTROL BOARD OPERATION  
AND TESTING  
1. Terminals “R”-”C” must have 24 V present  
between them in order for the time delay and  
defrost sequences to be operational.  
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2. Jumper the “T2”-”DFT” test pins. This will  
indicate to the board that the defrost T-stat  
is closed(if the compressor is running).  
Defrost T-stat is closed at 32° or below and  
is open at 68° or above. But it’s state is  
unknown if the temperature is between 32°F  
and 68°F. The defrost thermostat tells the  
board whether a defrost cycle needs to be  
started or terminated. With the DFT closed  
the unit will run for 30/60/90 minutes in heat  
mode and then defrost the outdoor coil. The  
defrostwillturnofftheoutdoorfan,turnonthe  
compressorandraisethecoiltemperatureto  
68°F. This will open the DFT and terminate  
the defrost. If the DFT does not open the  
defrost will end after 10 minutes.  
Speed up changes:  
Manually initiating a defrost will cause the  
compressortoruncontinuallywhenentering  
defrost.  
Normal defrost operation:  
To test normal defrost operation when the  
temperature is above 35°F, jumper “R” to  
“DFTonthe624656boardandallowtheunit  
to run for 30 minutes. Defrost will continue  
until the “R” to “DFT” jumper is removed or  
for 10 minutes. Remove the jumper.  
The5minutetimedelayfeaturecanbeshortened  
1 time to 1 second by jumping the “Test” to “C”  
terminal. Remove the jumper and repeat as  
desired.  
3. Defrost board speed-up. With compressor  
running in heat mode, next jump the “Test”  
pin to “C” on terminal strip. This will initiate  
a defrost test in 5, 10 or 15 seconds (This  
is determined by the 30, 60 or 90 minute  
defrost pin settings. The factory setting will  
be30minutes). Notethatthiswillbypassthe  
compressoroffdelaywhentheunitgoesinto  
defrosttestandifleftindefrosttest,thedelay  
will be bypassed when the test is terminated  
by the processor. If the jumper is removed  
before the test is over the processor will  
perform the remainder of a normal defrost.  
See step 2 above.  
Note: If jumper is left on the “Test” to “common”  
pins permanently, the defrost cycle will become  
inoperable.  
Defrost Test Procedure for 624656  
1. Jumper “T2” to “DFT” at the test terminals.  
2. With unit running in heat mode, short the  
“TESTterminaltothecommonterminalnear  
it. This will speed up the board and cause  
it to enter defrost mode in 5/10/15 seconds  
depending on the defrost time selection.  
Compressor delay will not function during  
speed-up.  
3. This test will end in 5 seconds if the “TEST”-  
common short is not removed.  
4. Remove both the short and theT2toDFT”  
jumper to terminate the defrost cycle. The  
30secondcompressordelayshouldoperate  
normally.  
4. Remove the jumpers.  
Note: The delay/no-delay pin concerns  
compressoroperationduringdefrosts.Thedefault  
setting is delay. Reciprocating compressors  
should only use this setting in conjunction with  
an approved hard start kit. Scroll compressors  
thathavenoiseissueswhilegoingintoorcoming  
out of defrost should use this 30 second delay to  
reducethedefrostnoise.Toswitchfromno-delay  
to delay remove the pin from the “no-delay” pin  
location and shift it to the “delay” pin location.  
5. Test is complete, reset thermostat to home  
owner preference.  
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Refrigerant Charging Charts  
( e p s i g ) e r s s u r  
L
10  
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Refrigerant Charging Charts  
( e p s i g ) e r s s u r  
L
11  
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REFRIGERANT CHARGING CHART  
Heating Mode of Operation  
12  
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C K B L A  
W H I T E  
C K B L A  
O R A N G E  
C C H  
C K B L A  
13  
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PHYSICAL AND ELECTRICAL SPECIFICATIONS / OUTDOOR UNITS  
10.1 EER —High Efficiency — Three Phase  
Model No.T3BN-  
090C  
090W  
120C  
120W  
280/230-3-60 460-3-60 280/230-3-60 460-3-60  
Volts-Phase-Hz  
380/420-3-50  
414-506  
380/420-3-50  
414-506  
Voltage Range (Min-Max)  
Total Amps  
187-253  
32.1  
187-253  
33.4  
16.4  
21.7  
17.2  
22.7  
Electrical Data  
Min Circuit Ampacity  
41.4  
43  
Delay Fuse Max. (1)  
60  
35  
70  
35  
Wire Size/Max Length (AWG 60°C Cu)  
Wire Size/Max Length (AWG 75°C Cu)  
Area (ft^2)  
4/100  
6/100  
31.94  
2-16  
8/100  
8/100  
31.94  
2-16  
4/100  
4/100  
31.94  
2-18  
8/100  
8/100  
31.94  
2-18  
Coil  
Rows-FPI  
Tube Dia.  
3/8” OD  
3/8” OD  
3/8” OD  
3/8” OD  
280/230-3-60 460-3-60 280/230-3-60 460-3-60  
Volts-Phase-Hz  
380/420-3-50  
1
380/420-3-50  
1
Qty  
Horsepower  
1
3/4  
1
3/4  
Fan Motor  
Fan Blade  
3/4  
1.7  
3/4  
1.7  
Full Load Amps  
Dia./Pitch/#Blades  
RPM/CFM (Max-Total)  
Volts-Phase-Hz  
Qty./Type  
3.3  
3.3  
Component Data  
30/19/3  
825/7500  
30/19/3  
825/7500  
30/26/3  
825/8500  
30/26/3  
825/8500  
280/230-3-60 460-3-60 280/230-3-60 460-3-60  
1 / Scroll  
28.8  
1 / Scroll  
14.7  
1 / Scroll  
30.1  
1 / Scroll  
15.5  
RLA  
Compressor  
Data  
LRA  
195  
95  
225  
114  
Stages/Percent  
Crankcase Heater Qty./Type  
0 - 15 ft.  
1 / 100  
1 / Band  
1 1/8”  
1 3/8” (3)  
1 3/8” (3)  
56  
1 / 100  
1 / Band  
1 1/8”  
1 3/8” (3)  
1 3/8” (3)  
56  
1 / 100  
1 / Band  
1 1/8”  
1 3/8” (3)  
1 3/8” (3)  
90  
1 / 100  
1 / Band  
1 1/8”  
1 3/8” (3)  
1 3/8” (3)  
90  
Refrigerant Suction Line-Length/O.D.  
16 - 25 ft  
(Liq. Line All Lengths - 5/8” O.D.)  
Circuits (Qty) - 1  
26 - 75 ft.  
Holding Charge  
Refrigerant Charge  
R-22 Ounces  
Weight  
Total System with 15’ Line Set (2)  
374  
374  
486  
486  
Net  
413  
413  
423  
423  
Approximate (lbs.)  
Ship  
425  
425  
435  
435  
(1) HACR Type Circuit Breakers may be used.  
(2) Add 9.0 oz. of refrigerant per 5 feet of additional line set.  
(3) Requires a 1-3/8” to 1-1/8” reducer line to unit.  
COPPER WIRE SIZE — AWG  
(1% Voltage Drop)  
ACCESSORIES —  
Condensing Unit  
Supply Wire Length-Feet  
Supply Circuit  
Ampacity  
200  
6
4
4
4
3
3
2
2
150  
8
6
6
4
4
4
3
3
100  
10  
8
8
6
6
6
4
4
50  
14  
12  
10  
10  
8
8
6
6
6
15  
20  
25  
30  
35  
40  
45  
50  
55  
60  
Low Ambient Kit 913549A- Maintains system  
pressures during low ambient conditions.  
2
1
3
2
4
3
4
14  
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15  
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INSTALLER:  
PLEASE LEAVE THESE  
INSTALLATION INSTRUCTIONS  
WITH THE HOMEOWNER  
708538A (replaces 7085380)  
¢708538G¤  
Specifications and illustrations subject  
to change without notice and without  
incurring obligations.  
708538A  
Printed in U.S.A. (08/08)  
Download from Www.Somanuals.com. All Manuals Search And Download.  

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