Carrier Heat Pump 50PSW036 360 User Manual

AQUAZONE™  
50PSW036-360  
Water-to-Water Water Source Heat Pump  
with PURON® Refrigerant (R-410A)  
50 Hz  
Installation, Start-Up, and  
Service Instructions  
Page  
CONTENTS  
Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
Retry Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
Aquazone Deluxe D Control LED Indicators . . . . . 17  
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18,19  
Water Coil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Refrigerant System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Condenser Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Checking System Charge . . . . . . . . . . . . . . . . . . . . . . . 19  
Refrigerant Charging. . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
Page  
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . .1,2  
GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12  
Step 1 — Check Jobsite . . . . . . . . . . . . . . . . . . . . . . . . 2  
Step 2 — Check Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
• STORAGE  
• PROTECTION  
• INSPECT UNIT  
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 19-21  
50PSW START-UP CHECKLIST . . . . . . . . . . . CL-1,CL-2  
Step 3 — Locate Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Step 4 — Mount Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Step 5 — Connect Piping. . . . . . . . . . . . . . . . . . . . . . . . . 5  
WATER SUPPLY AND QUALITY  
WATER LOOP APPLICATIONS  
IMPORTANT: Read the entire instruction manual before  
starting installation.  
• GROUND-WATER APPLICATIONS  
• GROUND-LOOP APPLICATIONS  
• UNIT LOAD PIPING  
Step 6 — Wire Electrical Connections. . . . . . . . . . . . 7  
• POWER CONNECTION  
SAFETY CONSIDERATIONS  
Installation and servicing of air-conditioning equipment can  
be hazardous due to system pressure and electrical compo-  
nents. Only trained and qualified service personnel should  
install, repair, or service air-conditioning equipment.  
• SUPPLY VOLTAGE  
• EXTERNAL LOOP POWER CONNECTION  
• 220-V OPERATION  
• 380-V OPERATION  
Step 7 — Wire Low Voltage Connections . . . . . . . . 12  
• THERMOSTAT CONNECTIONS  
WATER FREEZE PROTECTION  
• ACCESSORY CONNECTIONS  
Untrained personnel can perform basic maintenance func-  
tion of cleaning coils. All other operations should be performed  
by trained service personnel. When working on air-condition-  
ing equipment, observe precautions in the literature, tags and  
labels attached to the unit, and other safety precautions that  
may apply.  
Improper installation, adjustment, alteration, service, main-  
tenance, or use can cause explosion, fire, electrical shock or  
other conditions which may cause personal injury or property  
damage. Consult a qualified installer, service agency, or your  
distributor or branch for information or assistance. The  
qualified installer or agency must use factory-authorized kits or  
accessories when modifying this product. Refer to the individ-  
ual instructions packaged with the kits or accessories when  
installing.  
Follow all safety codes. Wear safety glasses and work  
gloves. Use quenching cloth for brazing operations. Have fire  
extinguisher available. Read these instructions thoroughly and  
follow all warnings or cautions attached to the unit. Consult  
local building codes and the National Electrical Code (NEC,  
U.S.A.) for special installation requirements.  
Understand the signal words — DANGER, WARNING,  
and CAUTION. DANGER identifies the most serious hazards  
which will result in severe personal injury or death. WARN-  
ING signifies hazards that could result in personal injury or  
death. CAUTION is used to identify unsafe practices, which  
would result in minor personal injury or product and property  
damage.  
WATER SOLENOID VALVES  
PRE-START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
System Checkout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
FIELD SELECTABLE INPUTS . . . . . . . . . . . . . . . .13,14  
Complete C Control Jumper Settings. . . . . . . . . . . 13  
Complete C Control DIP Switches. . . . . . . . . . . . . . 13  
Deluxe D Control Jumper Settings . . . . . . . . . . . . . 13  
Deluxe D Control DIP Switches . . . . . . . . . . . . . . . . 13  
Deluxe D Control Accessory Relay  
Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-16  
Operating Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
Unit Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
Scroll Compressor Rotation. . . . . . . . . . . . . . . . . . . . . 14  
Flow Regulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
Cleaning and Flushing . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
Antifreeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
Cooling Tower/Boiler Systems . . . . . . . . . . . . . . . . . . 16  
Ground Coupled, Closed Loop and Plateframe  
Heat Exchanger Well Systems . . . . . . . . . . . . . . . . 16  
OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
Power Up Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
Units with Aquazone Complete C Control . . . . . . . 16  
Units with Aquazone Deluxe D Control . . . . . . . . . . 16  
SYSTEM TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16,17  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Catalog No. 04-53500073-01 Printed in U.S.A. Form 50PSW-C1SI Pg 1 10-10 Replaces: New  
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B
4.6 cm  
A
5
6
2.5 cm  
4
2.5 cm  
C
3
J
H
G
M
F
E
2
1
L
K
D
Required  
Service Access  
Optional  
Service Access  
18.5 cm  
SIZES 036,060  
4.3 cm  
A
B
5
6
4
6.9 cm  
3
1
2
3.3 cm  
C
Required  
Service Access  
Optional  
Service Access  
SIZE 120  
WATER CONNECTIONS (mm)  
OVERALL CABINET  
(mm)  
ELECTRIC ACCESS PLUGS  
(mm)  
1
2
3
4
5
6
50PSW  
UNIT  
Source (Outdoor)  
Load (Indoor)  
HWG  
SIZE  
K
L
M
A
B
C
D
E
F
G
H
J
Low  
External Power  
Depth Width Height Water In Water Out Water In Water Out Return In Water Out  
Voltage Pump  
531  
759  
Supply  
785  
874  
036,060  
120  
778  
778  
645  
1344  
838  
940  
69  
640  
239  
640  
493  
765  
622  
765  
709  
886  
772  
886  
582  
810  
LEGEND  
HWG — Hot Water Generator  
HACR —  
Heating, Air Conditioning, and Refrigeration  
NOTES:  
1. Dimensions shown in centimeters unless noted otherwise.  
2. HACR circuit breaker in U.S.A. only.  
Fig. 1 — 50PSW036-120 Unit  
3
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Fault/Run Lights  
31.3  
38.1  
11.4  
10.8  
163.8  
Power Supply Wiring  
34.9 x 50.8 mm Double Knockout  
Top  
View  
53.3  
Control Wiring  
28.6 x 34.9 mm Double Knockout  
10.8  
11.4  
2FPTWater Connections  
38.1  
13.8  
Left  
Side  
View  
Front  
View  
114.6  
66.9  
Source  
Load  
Top  
Header  
Access  
Panel  
LEGEND  
FPT — Female Pipe Thread  
Electrical  
Access  
Panel  
NOTES:  
1. Dimensions shown in centimeters unless noted other-  
wise.  
2. For multiple units placed side by side, allow 1.2 m mini-  
mum front access for service and maintenance.  
Refrig.  
Circuit  
Access  
Panel  
Compressor  
Access  
Panel  
Side  
Front  
Minimum 91cm  
Required Service  
Access  
Optional (Single Unit)  
91cm Additional  
Service Access  
Fig. 2 — 50PSW180,360 Unit  
PROTECTION — Once the units are properly positioned on  
the jobsite, they must be covered with either a shipping carton,  
vinyl film, or an equivalent protective covering. Open ends of  
pipes stored on the jobsite must be capped. This precaution is  
especially important in areas where painting, plastering, or  
spraying of fireproof material, etc., is not yet complete. Foreign  
material that is allowed to accumulate within the units can pre-  
vent proper start-up and necessitate costly clean-up operations.  
INSPECT UNIT — To prepare the unit for installation, com-  
plete the procedures listed below:  
1. Compare the electrical data on the unit nameplate with  
ordering and shipping information to verify that the  
correct unit has been shipped.  
2. Verify that the unit is the correct model for the entering  
water temperature of the job.  
3. Wait to remove the packaging until the unit is ready for  
installation.  
Before installing any of the system components, be sure to  
examine each pipe, fitting, and valve, and remove any dirt or  
foreign material found in or on these components.  
4. Verify that the refrigerant tubing is free of kinks or dents,  
and that it does not touch other unit components.  
CAUTION  
5. Inspect all electrical connections. Be sure connections are  
clean and tight at the terminals.  
DO NOT store or install units in corrosive environments or  
in locations subject to temperature or humidity extremes  
(e.g., attics, garages, rooftops, etc.). Corrosive conditions  
and high temperature or humidity can significantly reduce  
performance, reliability, and service life. Always move  
units in an upright position. Tilting units on their sides may  
cause equipment damage.  
6. Loosen bolts and remove shipping clamps on compres-  
sors equipped with external spring vibration isolators.  
Compressors are internally spring-mounted.  
7. Locate and verify any accessory kit located in compressor  
section.  
4
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8. Remove any access panel screws that may be difficult to  
remove once unit is installed.  
In all applications, the quality of the water circulated  
through the heat exchanger must fall within the ranges listed in  
the Water Quality Guidelines table. Consult a local water treat-  
ment firm, independent testing facility, or local water authority  
for specific recommendations to maintain water quality within  
the published limits.  
Step 3 — Locate Unit — The following guidelines  
should be considered when choosing a location for the WSHP:  
• Units are for indoor use only.  
• Provide sufficient space for water and electrical  
connections.  
• Locate unit in an area that allows for easy access and  
removal of access panels.  
• Allow enough space for service personnel to perform  
maintenance.  
WATER LOOP APPLICATIONS — Water loop applica-  
tions usually include a number of units plumbed to a common  
piping system. Maintenance to any of these units can introduce  
air into the piping system. Therefore, air elimination  
equipment comprises a major portion of the mechanical room  
plumbing.  
The flow rate is usually set between 2.9 L/m and 3.9 L/m  
per kW of cooling capacity. For proper maintenance and ser-  
vicing, pressure-temperature (P/T) ports are necessary for tem-  
perature and flow verification.  
Step 4 — Mount Unit — Mount unit as shown in Fig. 3.  
Rod attachments must be able to support the weight of the unit.  
See Table 1 for unit operating weight.  
In addition to complying with any applicable codes, consid-  
er the following for system piping:  
Load Connections (Hot  
Water/Chilled Water)  
Automatic Flow  
Regulator  
Ball Valve  
with Pressure  
Temperature Port  
• Piping systems utilizing water temperatures below  
10.0 C require 13 mm closed cell insulation on all piping  
surfaces to eliminate condensation.  
Source Connections  
(Boiler/Tower/Ground)  
• All plastic to metal threaded fittings should be avoided  
due to the potential to leak. Use a flange fitted substitute.  
• Teflon* tape thread sealant is recommended to minimize  
internal fouling of the heat exchanger.  
• Use backup wrench. Do not overtighten connections.  
• Route piping to avoid service access areas to unit.  
• The piping system should be flushed prior to operation to  
remove dirt and foreign materials from the system.  
Ball Valve  
with Pressure  
Temperature Port  
Y Strainer with  
Blow Down Valve  
Power  
Disconnect  
Control  
Wiring  
a50-8138  
Cooling tower/boiler systems typially use a common loop  
maintained between 16 and 32 C. The use of a closed circuit  
evaporative cooling tower with a secondary heat exchanger be-  
tween the tower and the water loop is recommended. If an open  
type cooling tower is used continuously, chemical treatment  
and filtering will be necessary.  
Fig. 3 — Typical Water Loop System —  
GROUND-WATER APPLICATIONS — In addition to  
complying with any applicable codes, consider the following  
for system piping:  
• Install shut-off valves for servicing.  
• Install pressure-temperature plugs to measure flow and  
temperature.  
• Boiler drains and other valves should be connected using  
a “T” connector to allow acid flushing for the heat  
exchanger.  
• Do not overtighten connections.  
• Route piping to avoid service access areas to unit.  
• Use PVC SCH80 or copper piping material.  
NOTE: PVC SCH40 should not be used due to system high  
pressure and temperature extremes.  
GROUND-LOOP APPLICATIONS — Temperatures be-  
tween –3.9 and 43.3 C and a cooling capacity of 2.9 L/m and  
3.9 L/m per kW are recommended. In addition to complying  
with any applicable codes, consider the following for system  
piping:  
• Piping materials should be limited to only polyethylene  
fusion in the buried sections of the loop.  
• Galvanized or steel fittings should not be used at any  
time due to corrosion.  
Boiler, Tower, or Ground (Sizes 180,360 Shown)  
Step 5 — Connect Piping — Depending on the appli-  
cation, there are 3 types of WSHP piping systems to choose  
from: water loop, ground-water and ground loop. Refer to the  
Carrier System Design Manual for additional information.  
All WSHP units utilize low temperature soldered female  
pipe thread fittings for water connections to prevent annealing  
and out-of-round leak problems which are typically associated  
with high temperature brazed connections. When making pip-  
ing connections, consider the following:  
• A backup wrench must be used when making screw con-  
nections to unit to prevent internal damage to piping.  
• Insulation may be required on piping to avoid condensa-  
tion in the case where fluid in loop piping operates at  
temperatures below dew point of adjacent air.  
• Piping systems that contain steel pipes or fittings may  
be subject to galvanic corrosion. Dielectric fittings may  
be used to isolate the steel parts of the system to avoid  
galvanic corrosion.  
• Units may be manifolded together via top water connects  
to get increased temperatures, when piped in series, or  
greater capacity, when piped in parallel.  
• All plastic to metal threaded fittings should be avoided  
due to the potential to leak. Use a flange fitted substitute.  
• Do not overtighten connections.  
• Route piping to avoid service access areas to unit.  
• Pressure-temperature (P/T) plugs should be used to mea-  
sure flow of pressure drop.  
WATER SUPPLY AND QUALITY — Check water supply.  
Water supply should be plentiful and of good quality. See  
Table 2 for water quality guidelines.  
IMPORTANT: Failure to comply with the above required  
water quality and quantity limitations and the closed-  
system application design requirements may cause damage  
to the tube-in-tube heat exchanger that is not the responsi-  
bility of the manufacturer.  
*Teflon is a trademark of E. I. du Pont de Nemours and Company.  
5
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Table 2 — Water Quality Guidelines  
HX  
MATERIAL*  
CLOSED  
RECIRCULATING†  
CONDITION  
OPEN LOOP AND RECIRCULATING WELL**  
Scaling Potential — Primary Measurement  
Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below.  
pH/Calcium  
All  
N/A  
pH < 7.5 and Ca Hardness, <100 ppm  
Hardness Method  
Index Limits for Probable Scaling Situations (Operation outside these limits is not recommended.)  
Scaling indexes should be calculated at 150 F for direct use and HWG applications, and at 90 F for indirect HX use. A monitoring plan should be  
implemented.  
Ryznar Stability Index  
6.0 - 7.5  
If >7.5 minimize steel pipe use.  
All  
N/A  
Langelier Saturation Index  
–0.5 to +0.5  
All  
N/A  
If <–0.5 minimize steel pipe use.  
Based upon 150 F HWG and direct well, 85 F indirect well HX.  
Iron Fouling  
Iron Fe2+ (Ferrous)  
<0.2 ppm (Ferrous)  
If Fe2+ (ferrous) >0.2 ppm with pH 6 - 8, O2<5 ppm check for  
iron bacteria.  
(Bacterial Iron Potential)  
All  
All  
N/A  
N/A  
Iron Fouling  
<0.5 ppm of Oxygen  
Above this level deposition will occur.  
Corrosion Prevention††  
pH  
6 - 8.5  
6 - 8.5  
All  
All  
Monitor/treat as needed.  
Minimize steel pipe below 7 and no open tanks with pH <8.  
Hydrogen Sulfide (H2S)  
<0.5 ppm  
At H2S>0.2 ppm, avoid use of copper and cupronickel piping of HXs.  
Rotten egg smell appears at 0.5 ppm level.  
N/A  
N/A  
Copper alloy (bronze or brass) cast components are okay to <0.5 ppm.  
Ammonia Ion as Hydrox-  
ide, Chloride, Nitrate and  
Sulfate Compounds  
<0.5 ppm  
All  
Maximum Chloride Levels  
Maximum allowable at maximum water temperature.  
50 F (10 C)  
75 F (24 C)  
100 F (38 C)  
Copper  
Cupronickel  
304 SS  
N/A  
N/A  
N/A  
N/A  
N/A  
<20 ppm  
<150 ppm  
<400 ppm  
<1000 ppm  
>1000 ppm  
NR  
NR  
<250 ppm  
<550 ppm  
>550 ppm  
NR  
NR  
<150 ppm  
<375 ppm  
>375 ppm  
316 SS  
Titanium  
Erosion and Clogging  
Particulate Size and  
Erosion  
<10 ppm of particles and  
a maximum velocity of <10 ppm (<1 ppm “sandfreefor reinjection) of particles and a maxi-  
All  
6 fps.  
Filtered for maximum  
800 micron size.  
mum velocity of 6 fps. Filtered for maximum 800 micron size. Any par-  
ticulate that is not removed can potentially clog components.  
LEGEND  
HWG— Hot Water Generator  
HX — Heat Exchanger  
N/A — Design Limits Not Applicable Consid-  
ering Recirculating Potable Water  
NR — Application Not Recommended  
SS — Stainless Steel  
††If the concentration of these corrosives exceeds the maximum  
allowable level, then the potential for serious corrosion problems  
exists.  
Sulfides in the water quickly oxidize when exposed to air, requir-  
ing that no agitation occur as the sample is taken. Unless tested  
immediately at the site, the sample will require stabilization with a  
few drops of one Molar zinc acetate solution, allowing accurate  
sulfide determination up to 24 hours after sampling. A low pH and  
high alkalinity cause system problems, even when both values are  
within ranges shown. The term pH refers to the acidity, basicity, or  
neutrality of the water supply. Below 7.0, the water is considered  
to be acidic. Above 7.0, water is considered to be basic. Neutral  
water contains a pH of 7.0.  
*Heat exchanger materials considered are copper, cupronickel,  
304 SS (stainless steel), 316 SS, titanium.  
†Closed recirculating system is identified by a closed pressurized  
piping system.  
**Recirculating open wells should observe the open recirculating  
design considerations.  
To convert ppm to grains per gallon, divide by 17. Hardness in  
mg/l is equivalent to ppm.  
UNIT LOAD PIPING — For applications with wide temper-  
ature variation such as heating/cooling coils:  
• Use piping materials that are rated for the maximum tem-  
perature and pressure combination. This excludes PVC  
for most heating applications.  
Swimming Pool Hot Tub Applications — Load heat ex-  
changer should be isolated with secondary heat exchanger  
constructed of anti-corrosion material in all chlorine/bromine  
fluid applications.  
Potable Water Applications  
• Ensure load water flow in high temperature heating  
applications is at least 3.2 L/m per kW to improve perfor-  
mance and reduce nuisance high pressure faults.  
• DO NOT employ plastic to metal threaded joints.  
• Utilize a pressure tank and air separator vent system to  
equalize pressure and remove air.  
• Load coax material should always be vented double  
walled for use in potable water systems.  
• Ensure load water flow in high temperature heating  
applications is at least 3.2 L/m per kW to improve perfor-  
mance and reduce nuisance high pressure faults.  
• Employ an 800-micron particulate strainer in both load  
and source plumbing to protect the plate heat exchanger.  
6
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Voltages between phases must be balanced within 2%.  
Use the following formula to determine the percentage voltage  
imbalance:  
Step 6 — Wire Electrical Connections  
WARNING  
% Voltage Imbalance  
To avoid possible injury or death due to electrical shock,  
open the power supply disconnect switch and secure it in  
an open position during installation. Install lockout tag.  
max voltage deviation from average voltage  
= 100 x  
average voltage  
Example: Supply voltage is 380-3-50.  
AB = 372 volts  
BC = 376 volts  
AC = 384 volts  
CAUTION  
Use only copper conductors for field-installed electrical  
wiring. Unit terminals are not designed to accept other  
types of conductors. Failure to heed this warning could  
result in equipment damage.  
372 + 376 + 384  
Average Voltage =  
3
1132  
=
3
All field-installed wiring, including the electrical ground,  
MUST comply with the National Electrical Code (NEC) as  
well as applicable local codes. In addition, all field wiring must  
conform to the Class II temperature limitations described in the  
NEC.  
Operating voltage must be the same voltage and phase as  
shown in Table 3.  
Refer to unit wiring diagrams Fig. 4-8 for a schematic of the  
field connections which must be made by the installing (or  
electrical) contractor.  
Consult the unit wiring diagram located on the inside of the  
compressor access panel to ensure proper electrical hookup.  
The installing (or electrical) contractor must make the field  
connections when using field-supplied disconnect.  
Make all final electrical connections with a length of flexi-  
ble conduit to minimize vibration and sound transmission to  
the building.  
POWER CONNECTION — Line voltage connection is  
made by connecting incoming line voltage wires to L1, L2, and  
L3 on the power distribution block.  
= 377  
Determine maximum deviation from average voltage:  
(AB) 372 – 377 = 5 v  
(BC) 376 – 377 = 1 v  
(AC) 384 – 377 = 7 v  
Maximum deviation is 7 v.  
Determine percent voltage imbalance.  
7
% Voltage Imbalance = 100 x  
377  
= 1.86%  
This amount of phase imbalance is satisfactory as it is  
below the maximum allowable 2%.  
Operation on improper line voltage or excessive phase  
imbalance constitutes abuse and may cause damage to electri-  
cal components.  
NOTE: If more than 2% voltage imbalance is present, contact  
local electric utility.  
SUPPLY VOLTAGE — Operating voltage to unit must be  
within voltage range indicated on unit nameplate.  
Table 3 — 50PSW Electrical Data  
COMPRESSOR  
50PSW UNIT  
SIZE  
VOLTAGE  
(V-Ph-Hz)  
VOLTAGE RANGE  
MIN/MAX  
TOTAL  
FLA  
MCA  
MOCP*  
RLA  
13.5  
5.4  
LRA  
67  
38  
QTY  
1
1
1
1
2
2
1
1
220/240-1-50  
380/420-3-50  
220/240-1-50  
380/420-3-50  
220/240-1-50  
380/420-3-50  
220/240-1-50  
380/420-3-50  
220/240-1-50  
380/420-3-50  
198/264  
342/462  
198/264  
342/462  
198/264  
342/462  
198/264  
342/462  
198/264  
342/462  
13.5  
5.4  
24.5  
9.6  
49.0  
19.2  
44.9  
18.6  
89.8  
37.2  
16.9  
6.8  
30  
15  
50  
20  
80  
30  
100  
40  
125  
60  
036  
060  
120  
180  
360  
24.5  
9.6  
24.5  
9.6  
44.9  
18.6  
44.9  
18.6  
153  
74  
153  
74  
273  
118  
273  
118  
30.6  
12.0  
55.1  
21.6  
56.1  
23.3  
101.0  
46.6  
2
2
LEGEND  
FLA  
Full Load Amps  
HACR — Heating, Air Conditioning, and Refrigeration  
LRA — Locked Rotor Amps  
MCA — Minimum Circuit Amps  
MOCP — Minimum Overcurrent Protection  
RLA — Rated Load Amps  
*Time-delay fuse or HACR circuit breaker.  
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a50-8621  
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ACCESSORY CONNECTIONS — The terminal labeled A  
on the control is provided to control accessory devices such as  
water valves, electronic air cleaners, humidifiers, etc. This sig-  
nal operates with the compressor terminal. See Fig. 10. Refer  
to the specific unit wiring schematic for details.  
L1 L2 L3  
Grnd  
Power Distribution  
Block  
Terminal Strip  
Transformer  
C
Typical  
Water  
Valve  
C Control #1  
24 VAC  
Contactor -CC2  
Contactor -CC1  
A
C Control #2  
Fig. 10 — Typical Aquazone Accessory Wiring  
(Deluxe D Control Shown)  
Fig. 8 — Typical Field Wiring  
NOTE: The A terminal should only be used with 24-v signals,  
not line voltage signals.  
EXTERNAL LOOP POWER CONNECTION — If the unit  
is to be connected to an external loop pump or flow controller,  
connect the pump to the loop pump terminal block PB1. The  
maximum power handling is 4 amps at 240-v. The pumps will  
automatically cycle as required by the unit.  
IMPORTANT: Two-compressor units with Complete C or  
Deluxe D controls wired to terminal A will be turned off if  
the controls are in lockout mode, even if the other board is  
in normal operating mode.  
WATER SOLENOID VALVES — Water solenoid valves  
may be used on variable flow systems and ground water instal-  
lations. A typical well water control valve wiring which can  
limit waste water in a lockout condition is shown in Fig. 10. A  
slow closing valve may be required to prevent water hammer.  
When using a slow closing valve, special wiring conditions  
need to be considered. The valve takes approximately 60 sec-  
onds to open (very little water will flow before 45 seconds) and  
it activates the compressor only after the valve is completely  
opened by closing its end switch. When wired as shown, the  
valve will have the following operating characteristics:  
220-V OPERATION — All 220/240-v units are factory  
wired for 220-v. The transformers may be switched to 240-v  
operation (as illustrated on the wiring diagram) by switching  
the red (220-v) wire with the orange (240-v) wire at the L2  
terminal.  
380-VOLT OPERATION — All 380/415 volt units are factory  
wired for 420 volts. The transformers may be switched to  
380-volt operation by switching the brown (380 volt) wire  
with the violet (420 volt) wire at the L1 terminal.  
Step 7 — Wire Low Voltage Connections  
THERMOSTAT CONNECTIONS  
1. Remain open during a lockout.  
2. Draw approximately 25 to 35-va through the “Y” signal  
of the thermostat.  
The thermostat should be wired directly to the Aquazone™  
control board. See Fig. 4-7.  
WATER FREEZE PROTECTION — The Aquazone control  
allows the field selection of source fluid freeze protection  
points through jumpers. The factory setting of jumper JW3  
(FP1) is set for water at –1.1 C. In earth loop applications,  
jumper JW3 should be clipped to change the setting to –12.2 C  
when using antifreeze in colder earth loop applications. See  
Fig. 9.  
IMPORTANT: This can overheat the anticipators of  
electromechanical thermostats. Only use relay based  
electronic thermostats.  
PRE-START-UP  
System Checkout — When the installation is complete,  
follow the system checkout procedure outlined below before  
starting up the system. Be sure:  
1. Voltage is within the utilization range specifications of the  
unit compressor and fan motor, and voltage is balanced  
for 3-phase units.  
2. Fuses, breakers and wire are correct size.  
3. Low voltage wiring is complete.  
4. Piping and system flushing is complete.  
5. Air is purged from closed loop system.  
6. System is balanced as required. Monitor if necessary.  
7. Isolation valves are open.  
8. Water control valves or loop pumps are wired.  
9. Transformer switched to lower voltage tap if necessary.  
10. Service/access panels are in place.  
11. Control field-selected settings are correct.  
Fig. 9 — Typical Aquazone Control Board  
Jumper Locations (Complete C Control Shown)  
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(units with 2 compressors and 2 Deluxe D controls) or in mas-  
ter/slave applications. In master/slave applications, each com-  
pressor and fan will stage according to its switch 2 setting. If  
switch is set to Stage 2, the compressor will have a 3-second  
delay before energizing during Stage 2 demand.  
FIELD SELECTABLE INPUTS  
Jumpers and DIP (dual in-line package) switches on the  
control board are used to customize unit operation and can be  
configured in the field.  
NOTE: If DIP switch is set for Stage 2, the alarm relay will not  
cycle during Test mode.  
IMPORTANT: Jumpers and DIP switches should only  
be clipped when power to control board has been turned  
off.  
Heating/Cooling Thermostat Type — Switch 3 provides selec-  
tion of thermostat type. Heat pump or heat/cool thermostats  
can be selected. Select OFF for heat/cool thermostats. When in  
heat/cool mode, Y1 is used for cooling Stage 1, Y2 is used for  
cooling Stage 2, W1 is used for heating Stage 1 and O/W2 is  
used for heating Stage 2. Select ON for heat pump applications.  
In heat pump mode, Y1 used is for compressor Stage 1, Y2 is  
used for compressor Stage 2, W1 is used for heating Stage 3 or  
emergency heat, and O/W2 is used for RV (heating or cooling)  
depending upon switch 4 setting.  
Complete C Control Jumper Settings (See  
Fig. 4-6)  
WATER COIL FREEZE PROTECTION (FP1) LIMIT  
SETTING — Select jumper 3, (JW3-FP1 Low Temp) to  
choose FP1 limit of –12.2 C or –1.1 C. To select –1.1 C as the  
limit, DO NOT clip the jumper. To select –12.2 C as the limit,  
clip the jumper.  
ALARM RELAY SETTING — Select jumper 1 (JW1-AL2  
Dry) for connecting alarm relay terminal (AL2) to 24 vac (R)  
or to remain as a dry contact (no connection). To connect AL2  
to R, do not clip the jumper. To set as dry contact, clip the  
jumper.  
O/B Thermostat Type — Switch 4 provides selection for heat  
pump O/B thermostats. O is cooling output. B is heating out-  
put. Select ON for heat pumps with O output. Select OFF for  
heat pumps with B output.  
Switches 5, 6, 7, 8 — Not used.  
Complete C Control DIP Switches The  
Complete C control has one DIP switch block with five  
switches. See Fig. 4-6.  
PERFORMANCE MONITOR (PM) — DIP switch 1 will  
enable or disable this feature. To enable the PM, set the switch  
to ON. To disable the PM, set the switch to OFF.  
STAGE 2 — DIP switch 2 will enable or disable compressor  
delay. Set DIP switch to OFF for Stage 2 in which the compres-  
sor will have a 3-second delay before energizing. DIP switch 3  
is not used. DIP switch 4 is not used. DIP switch 5 is used to  
initiate one or 3 tries for the FP1 fault. If water freeze protec-  
tion for the water coil is needed, then DIP switch 5 can be set to  
lock out on the FP1 fault after one try.  
DIP SWITCH BLOCK 2 (S2) — Used for accessory relay  
configurations.  
Deluxe D Control Accessory Relay Configura-  
tions (See Tables 4 and 5) — The following acces-  
sory relay settings are applicable for Deluxe D control only:  
CYCLE WITH COMPRESSOR — In this configuration, the  
relay will be ON any time the compressor relay is on.  
DIGITAL NIGHT SETBACK (NSB) — In this configura-  
tion, the relay will be ON if the NSB input is connected to  
ground C.  
NOTE: If there are no relays configured for digital NSB, then  
the NSB and OVR inputs are automatically configured for  
mechanical operation.  
MECHANICAL NIGHT SETBACK — When NSB input is  
connected to ground C, all thermostat inputs are ignored. A  
thermostat setback heating call will then be connected to the  
OVR input. If OVR input becomes active, then the Deluxe D  
control will enter night low limit (NLL) staged heating mode.  
The NLL staged heating mode will then provide heating during  
the NSB period.  
Deluxe D Control Jumper Settings (See  
Fig. 7)  
WATER COIL FREEZE PROTECTION (FP1) LIMIT  
SETTING — Select jumper 3, (JW3-FP1 Low Temp) to  
choose FP1 limit of –12.2 C or –1.1 C. To select –1.1 C as the  
limit, DO NOT clip the jumper. To select –12.2 C as the limit,  
clip the jumper.  
ALARM RELAY SETTING — Select jumper 4 (JW4-AL2  
Dry) for connecting alarm relay terminal (AL2) to 24 vac (R)  
or to remain as a dry contact (no connection). To connect AL2  
to R, do not clip the jumper. To set as dry contact, clip the  
jumper.  
LOW PRESSURE SETTING — The Deluxe D control can  
be configured for Low Pressure Setting (LP). Select jumper 1  
(JW1-LP Norm Open) for choosing between low pressure in-  
put normally opened or closed. To configure for normally  
closed operation, do not clip the jumper. To configure for nor-  
mally open operation, clip the jumper.  
WATER VALVE (SLOW OPENING) — If relay is config-  
ured for water valve (slow opening), the relay will start 60 sec-  
onds prior to starting compressor relay.  
CAUTION  
To avoid equipment damage, DO NOT leave system filled  
in a building without heat during the winter unless anti-  
freeze is added to system water. Condenser coils never  
fully drain by themselves and will freeze unless winterized  
with antifreeze.  
Deluxe D Control DIP Switches — The Deluxe D  
control has 2 DIP switch blocks. Each DIP switch block has 8  
switches and is labeled either S1 or S2 on the circuit board. See  
Fig. 7.  
Table 4 — DIP Switch Block S2 —  
Accessory 1 Relay Options  
DIP SWITCH BLOCK 1 (S1) — This set of switches offers  
the following options for Deluxe D control configuration:  
DIP SWITCH POSITION  
ACCESSORY 1  
RELAY OPTIONS  
1
2
3
Performance Monitor (PM) — Set switch 1 to enable or dis-  
able performance monitor. To enable the PM, set the switch to  
ON. To disable the PM, set the switch to OFF.  
Compressor Relay Staging Operation — Switch 2 will en-  
able or disable compressor relay staging operation. The com-  
pressor relay can be set to turn on with Stage 1 or Stage 2 call  
from the thermostat. This setting is used with dual stage units  
Digital NSB  
Water Valve — Slow Opening  
Off  
On  
On  
Off  
On  
On  
LEGEND  
NSB — Night Setback  
NOTE: All other DIP switch combinations are invalid.  
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Table 5 — DIP Switch Block S2 —  
Accessory 2 Relay Options  
6. If unit fails to operate, perform the following system  
checks:  
a. Check the voltage and current. Be sure they com-  
ply with electrical data on unit nameplate.  
b. Check for loose terminal screws where wire con-  
nections have been made on both the line and low-  
voltage terminal boards.  
DIP SWITCH POSITION  
ACCESSORY 2  
RELAY OPTIONS  
4
5
6
On  
On  
Digital NSB  
Water Valve — Slow Opening  
Off  
On  
On  
Off  
LEGEND  
NSB — Night Setback  
c. Check the supply and return piping. Be sure they  
are properly connected to the inlet and outlet con-  
nections on the unit.  
NOTE: All other DIP switch combinations are invalid.  
d. If the checks described above fail to reveal the  
problem and the unit still will not operate, contact  
a trained service technician to ensure proper  
diagnosis.  
START-UP  
Use the procedure outlined below to initiate proper unit  
start-up.  
NOTE: This equipment is designed for indoor installation  
only.  
Scroll Compressor Rotation — It is important to be  
certain compressor is rotating in the proper direction. To  
determine whether or not compressor is rotating in the proper  
direction:  
1. Connect service gages to suction and discharge pressure  
fittings.  
2. Energize the compressor.  
3. The suction pressure should drop and the discharge  
pressure should rise, as is normal on any start-up.  
If the suction pressure does not drop and the discharge  
pressure does not rise to normal levels:  
1. Turn off power to the unit. Install disconnect tag.  
2. Reverse any two of the unit power leads.  
3. Reapply power to the unit and verify pressures are cor-  
rect. The suction and discharge pressure levels should  
now move to their normal start-up levels.  
Operating Limits (See Table 6)  
ENVIRONMENT — This equipment is designed for indoor  
installation ONLY. Extreme variations in temperature, humidi-  
ty and corrosive water or air will adversely affect the unit per-  
formance, reliability and service life.  
POWER SUPPLY — A voltage variation of ± 10% of name-  
plate utilization voltage is acceptable.  
NOTE: These operating conditions are not normal or continu-  
ous operating conditions. It is assumed that start-up is for the  
purpose of bringing the building space up to occupancy  
temperature.  
WARNING  
When the disconnect switch is closed, high voltage is pres-  
ent in some areas of the electrical panel. Exercise caution  
when working with the energized equipment.  
CAUTION  
When the compressor is rotating in the wrong direction, the  
unit makes an elevated level of noise and does not provide  
cooling. Damage to compressor will occur if allowed to  
operate in this manner.  
Table 6 — 50PSW Unit Operating Limits (C)  
BUILDING COMMISSIONING  
After a few minutes of reverse operation, the scroll com-  
pressor internal overload protection will open, thus activating  
the unit lockout. This requires a manual reset. To reset, turn the  
thermostat on and then off.  
NOTE: There is a 5-minute time delay before the compressor  
will start.  
COOLING  
Load  
HEATING  
Load Ambient  
50PSW  
Source  
Ambient Source  
UNIT SIZE  
Min/Max Min/Max Min/Max Min/Max Min/Max Min/Max  
036  
060,120  
180,360  
10/43  
10/49  
10/32  
16/27  
16/32  
16/32  
7/43  
7/43  
7/43  
–1/27  
–1/27  
10/21  
16/49  
16/49  
27/49  
4/29  
4/29  
4/29  
BUILDING OPERATING  
COOLING  
Flow Regulation — Flow regulation can be accom-  
plished by two methods. Most water control valves have a flow  
adjustment built into the valve. By measuring the pressure drop  
through the unit heat exchanger, the flow rate can be deter-  
mined. Adjust the water control valve until the flow of 0.09 to  
0.13 L/s is achieved. Since the pressure constantly varies, two  
pressure gages may be needed in some applications. See  
Table 7 for heat exchanger pressure drops.  
HEATING  
Load  
50PSW  
Source  
Load  
Ambient Source  
Ambient  
UNIT SIZE  
Min/Max Min/Max Min/Max Min/Max Min/Max Min/Max  
036  
060,120  
180,360  
10/49  
10/49  
10/43  
10/32  
10/32  
10/32  
7/43  
7/43  
7/43  
–7/27  
–7/27  
–7/21  
16/54  
16/54  
16/49  
4/29  
4/29  
4/29  
Unit Start-Up  
1. Turn off all power to unit.  
2. Adjust all valves to full open position.  
3. Restore power to unit.  
4. Operate each unit in the cooling cycle. See Table 6 for  
unit entering water temperatures.  
An alternative method is to install a flow control device.  
These devices are typically an orifice of plastic material de-  
signed to allow a specified flow rate that are mounted on the  
outlet of the water control valve. Occasionally these valves  
produce a velocity noise that can be reduced by applying some  
back pressure. To accomplish this, slightly close the leaving  
isolation valve of the water regulating device.  
5. Operate each heat pump in the heating cycle immediately  
after checking cooling cycle operation.  
NOTE: A time delay will prevent the compressor from  
re-starting for approximately 5 minutes. The time delay  
function can be overridden on the Complete C control  
board.  
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Table 7 — Heat Exchanger Pressure Drop  
6. Raise the loop temperature to approximately 29.4 C.  
Open the drain at the lowest point in the system. Adjust  
the make-up water replacement rate to equal the rate of  
bleed.  
7. Refill the system and add trisodium phosphate in a pro-  
portion of approximately 0.5 kg per 750 L of water (or  
other equivalent approved cleaning agent).  
UNIT SIZES 036-120  
PRESSURE DROP (kPa)  
50PSW  
UNIT SIZE  
L/s  
–1 C  
10 C  
21 C  
32 C  
Source/Outdoor Coax  
0.28  
0.43  
0.57  
0.47  
0.71  
0.95  
0.95  
1.42  
1.89  
11.7  
28.3  
49.0  
10.3  
27.6  
47.6  
11.7  
30.3  
52.4  
9.0  
23.4  
41.4  
9.0  
23.4  
42.8  
9.7  
26.2  
46.9  
6.9  
19.3  
35.2  
17.2  
47.6  
88.3  
8.3  
22.8  
42.1  
5.5  
16.5  
31.0  
14.5  
42.1  
80.0  
6.2  
18.6  
34.5  
036  
060  
120  
CAUTION  
To avoid possible damage to a plastic (PVC) piping sys-  
tem, do not allow temperatures to exceed 43.3 C.  
Raise the loop temperature to 37.8 C. Circulate the solu-  
tion for a minimum of 8 to 24 hours. At the end of this  
period, shut off the circulating pump and drain the solu-  
tion. Repeat system cleaning if desired.  
Load/Outdoor Coax  
0.28  
0.43  
0.57  
0.47  
0.71  
0.95  
0.95  
1.42  
1.89  
4.1  
9.7  
3.4  
9.0  
2.1  
7.6  
036  
060  
120  
18.0  
16.5  
15.2  
8. When the cleaning process is complete, remove the short-  
circuited hose. Reconnect the hoses to the proper supply,  
and return the connections to each of the units. Refill the  
system and bleed off all air.  
9. Test the system pH with litmus paper. The system water  
should be slightly alkaline (pH of 7.5 to 8.5). Add chemi-  
cals, as appropriate, to maintain acidity levels.  
10. When the system is successfully cleaned, flushed, refilled  
and bled, restore power.  
11. Check the main system panels, safety cutouts and alarms.  
Set the controls to properly maintain loop temperatures.  
9.7  
24.1  
42.8  
11.0  
26.2  
46.9  
9.0  
22.1  
40.0  
9.7  
24.1  
44.1  
8.3  
20.7  
37.9  
2.1  
22.8  
41.1  
UNIT SIZES 180,360  
PRESSURE DROP (kPa)  
50PSW  
UNIT SIZE  
L/s  
0 C  
10 C  
20 C  
30 C  
Source/Outdoor Coax  
1.10  
1.67  
2.21  
2.21  
3.34  
4.42  
4.82  
17.92  
32.40  
11.03  
26.88  
48.95  
2.76  
11.72  
22.75  
8.27  
24.82  
44.82  
1.72  
11.38  
21.37  
7.22  
23.10  
41.36  
0.88  
9.47  
180  
360  
19.30  
CAUTION  
6.29  
21.29  
38.47  
DO NOT use “Stop Leak” or any similar chemical agent in  
this system. Addition of these chemicals to the loop water  
will foul the system and inhibit unit operation.  
NOTE: Bold values indicate use of antifreeze is required.  
Antifreeze — In areas where entering loop temperatures  
drop below 4.4 C or where piping will be routed through areas  
subject to freezing, antifreeze is needed.  
Alcohols and glycols are commonly used as antifreeze  
agents. Freeze protection should be maintained to 8.3° C below  
the lowest expected entering loop temperature. For example, if  
the lowest expected entering loop temperature is –1.1 C, the  
leaving loop temperature would be –5.6 to –3.9 C. Therefore,  
the freeze protection should be at –9.4 C (–1.1 C – 8.3 C =  
–9.4 C).  
Cleaning and Flushing — Cleaning and flushing of  
the piping system is the single most important step to ensure  
proper start-up and continued efficient operation of the system.  
WARNING  
To avoid possible injury or death due to electrical shock,  
open the power supply disconnect switch and secure it in  
an open position before flushing system. Install lockout  
tag.  
IMPORTANT: All alcohols should be pre-mixed and  
pumped from a reservoir outside of the building or  
introduced under water level to prevent alcohols from  
fuming.  
Follow the instructions below to properly clean and flush  
the system:  
1. Verify electrical power to the unit is disconnected and  
lockout tag installed.  
2. Install the system with the supply hose connected directly  
to the return riser valve. Use a single length of flexible  
hose.  
3. Open all air vents. Fill the system with the water. DO  
NOT allow system to overflow. Bleed all air from the  
system. Pressurize and check the system for leaks and re-  
pair appropriately.  
4. Verify all strainers are in place. Start the pumps, and sys-  
tematically check each vent to ensure all air is bled from  
the system.  
Calculate the total volume of fluid in the piping system. See  
Table 8. Use the percentage by volume in Table 9 to determine  
the amount of antifreeze to use. Antifreeze concentration  
should be checked from a well mixed sample using a hydrome-  
ter to measure specific gravity.  
FREEZE PROTECTION SELECTION — The –1.1 C FP1  
factory setting (water) should be used to avoid freeze damage  
to the unit.  
Once antifreeze is selected, the JW3 jumper (FP1) should  
be clipped on the control to select the low temperature (anti-  
freeze –12.2 C) set point to avoid nuisance faults.  
5. Verify make-up water is available. Adjust make-up water  
appropriately to replace the air which was bled from the  
system. Check and adjust the water/air level in the expan-  
sion tank.  
15  
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Table 8 — Approximate Fluid Volume (L)  
per 30 M of Pipe  
NOTE: On all subsequent compressor calls the random start  
delay is omitted.  
HEATING STAGE 2 — To enter Stage 2 mode, terminal W is  
active (Y is already active). Also, the G terminal must be active  
or the W terminal is disregarded.  
PIPE  
Copper  
DIAMETER (in.) [mm] VOLUME (gal.) [L]  
1 [25.4]  
1.25 [31.8]  
1.5 [38.1]  
4.1 [15.5]  
6.4 [24.2]  
9.2 [34.8]  
Units with Aquazone Deluxe D Control  
STANDBY — The compressor will be off. The reversing  
valve (RV) relays will be on if inputs are present.  
Rubber Hose  
Polyethylene  
1 [25.4]  
3.9 [14.8]  
3/4 IPS SDR11  
1 IPS SDR11  
11/4 IPS SDR11  
1/2 IPS SDR11  
2 IPS SDR11  
11/4 IPS SCH40  
11/2 IPS SCH40  
2 IPS SCH40  
2.8 [10.6]  
4.5 [17.0]  
8.0 [30.8]  
10.9 [41.3]  
18.0 [68.1]  
8.3 [31.4]  
10.9 [41.3]  
17.0 [64.4]  
HEATING STAGE 1 — In Heating Stage 1 mode, the fan en-  
able and compressor relays are turned on immediately. Once  
the demand is removed, the relays are turned off and the con-  
trol reverts to standby mode. If there is a master/slave or dual  
compressor application, all compressor relays and related func-  
tions will operate per their associated DIP switch 2 setting on  
S1.  
HEATING STAGE 2 — In Heating Stage 2 mode, the com-  
pressor relays remain on. The control reverts to Heating Stage  
1 mode once demand is removed. If there is a master/slave or  
dual compressor application, all compressor relays and related  
functions will operate per their associated DIP switch 2 setting  
on S1.  
LEGEND  
IPS — Internal Pipe Size  
SCH — Schedule  
SDR — Standard Dimensional Ratio  
NOTE: Volume of heat exchanger is approximately 1.0 gallon  
(3.78 liters).  
Table 9 — Antifreeze Percentages by Volume  
COOLING STAGE 1 — In Cooling Stage 1 mode, the com-  
pressor and RV relays are turned on immediately. If configured  
as stage 2 (DIP switch set to OFF) then the compressor and fan  
will not turn on until there is a stage 2 demand. The compressor  
relays are turned off immediately when the Cooling Stage 1 de-  
mand is removed. The control reverts to standby mode. The  
RV relay remains on until there is a heating demand. If there is  
a master/slave or dual compressor application, all compressor  
relays and related functions will track with their associated DIP  
switch 2 on S1.  
COOLING STAGE 2 — In Cooling Stage 2 mode, the com-  
pressor and RV relays remain on. The control reverts to Cool-  
ing Stage 1 mode once the demand is removed. If there is a  
master/slave or dual compressor application, all compressor re-  
lays and related functions will track with their associated DIP  
switch 2 on S1.  
NIGHT LOW LIMIT (NLL) STAGED HEATING — In NLL  
staged heating mode, the override (OVR) input becomes  
active and is recognized as a call for heating and the control  
will immediately go into a Heating Stage 1 mode. With an  
additional 30 minutes of NLL demand, the control will go into  
Heating Stage 2 mode. With another additional 30 minutes of  
NLL demand, the control will go into Heating Stage 3 mode.  
MINIMUM TEMPERATURE FOR FREEZE  
PROTECTION (C)  
ANTIFREEZE  
Methanol (%)  
100% USP Food Grade  
Propylene Glycol (%)  
–12.2  
–9.4  
–6.7  
–3.9  
25  
21  
16  
10  
38  
29  
30  
25  
22  
20  
15  
14  
Ethanol (%)  
Cooling Tower/Boiler Systems These systems  
typically use a common loop maintained at 15.6 to 32.2 C. The  
use of a closed circuit evaporative cooling tower with a second-  
ary heat exchanger between the tower and the water loop is rec-  
ommended. If an open type cooling tower is used continuously,  
chemical treatment and filtering will be necessary.  
Ground Coupled, Closed Loop and Plateframe  
Heat Exchanger Well Systems These systems al-  
low water temperatures from –1.1 to 43.3 C. The external loop  
field is divided up into 51 mm polyethylene supply and return  
lines. Each line has valves connected in such a way that upon  
system start-up, each line can be isolated for flushing using only  
the system pumps. Air separation should be located in the pip-  
ing system prior to the fluid re-entering the loop field.  
OPERATION  
Power Up Mode — The unit will not operate until all the  
inputs, terminals and safety controls are checked for normal  
operation.  
NOTE: The compressor will have a 5-minute anti-short cycle  
upon power up.  
SYSTEM TEST  
System testing provides the ability to check the control  
operation. The control enters a 20-minute Test mode by mo-  
mentarily shorting the test pins. All time delays are increased  
15 times. See Fig. 11.  
Units with Aquazone™ Complete C Control  
STANDBY — The Y and W terminals are not active in Stand-  
by mode, however the O and G terminals may be active, de-  
pending on the application. The compressor will be off.  
COOLING — The Y and O terminals are active in Cooling  
mode. After power up, the first call to the compressor will initi-  
ate a 5 to 80 second random start delay and a 5-minute anti-  
short cycle protection time delay. After both delays are com-  
plete, the compressor is energized.  
TEST  
BR BRG CCG CC  
MODE  
PINS  
C
R
C
Off On  
Test  
R
JW3  
FP1  
NOTE: On all subsequent compressor calls the random start  
delay is omitted.  
Fig. 11 — Test Mode Pins Location  
HEATING STAGE 1 — Terminal Y is active in heating  
Stage 1. After power up, the first call to the compressor will  
initiate a 5 to 80 second random start delay and a 5-minute anti-  
short cycle protection time delay. After both delays are  
complete, the compressor is energized.  
Test Mode — Enter the Test mode on Complete C or  
Deluxe D controls by momentarily shorting the test terminals.  
The Complete C or Deluxe D control will enter a 20-minute  
test mode period in which all time delays are sped up 15 times.  
16  
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Upon entering Test mode, the status LED (light-emitting di-  
ode) will flash a code representing the last fault. For diagnostic  
ease at the thermostat, the alarm will also cycle during Test  
mode. The alarm relay will cycle on and off similar to the sta-  
tus LED to indicate a code representing the last fault, at the  
thermostat. Test mode can be exited by shorting the test termi-  
nals for 3 seconds. See Tables 10-12.  
NOTE: Deluxe D control has a flashing code and alarm relay  
cycling code that will both have the same numerical label.  
For example, flashing code 1 will have an alarm relay cycling  
code 1. Code 1 indicates the control has not faulted since the  
last power off to power on sequence.  
Aquazone™ Deluxe D Control LED Indica-  
tors — There are 3 LED indicators on the Deluxe D control:  
STATUS LED — Status LED indicates the current status or  
mode of the Deluxe D control. The Status LED light is green.  
TEST LED — Test LED will be activated any time the De-  
luxe D control is in Test mode. The Test LED light is yellow.  
FAULT LED — Fault LED light is red. The fault LED will  
always flash a code representing the last fault in memory. If  
there is no fault in memory, the fault LED will flash code 1 on  
the display and appear as 1 fast flash alternating with a  
10-second pause. See Table 12.  
Retry Mode — In Retry mode, the status LED will start to  
flash slowly to signal that the control is trying to recover from  
an input fault. The control will stage off the outputs and try to  
again satisfy the thermostat used at terminal Y. Once the ther-  
mostat input calls are satisfied, the control will continue normal  
operation.  
NOTE: If 3 consecutive faults occur without satisfying the  
thermostat input call to terminal Y, the control will go into  
lockout mode. The last fault causing the lockout is stored in  
memory and can be viewed by entering Test mode.  
Table 11 — Complete C Control LED Code and  
Fault Descriptions  
LED  
CODE  
1
FAULT  
DESCRIPTION  
No fault in memory  
There has been no fault since  
the last power-down to power-up  
sequence  
2
3
High-Pressure Switch  
Low-Pressure Switch  
HP Open Instantly  
LP open for 30 continuous  
seconds before or during a  
call (bypassed for first  
60 seconds)  
Table 10 — Complete C Control Current LED  
Status and Alarm Relay Operations  
4
5
7
Freeze Protection  
FP1 below Temp limit for  
30 continuous seconds  
(bypassed for first 60 seconds of  
operation)  
(Source) Coax — FP1  
DESCRIPTION OF  
OPERATION  
LED STATUS  
ALARM RELAY  
Freeze Protection (Load) FP2 below Temp limit for  
Coil — FP2  
30 continuous seconds  
(bypassed for first 60 seconds of  
operation)  
Normal Mode  
Open  
Cycle  
(Closed 5 sec.,  
Open 25 sec.)  
On  
Normal Mode with PM Warning  
Over/Under Voltage  
(Autoreset) Shutdown  
"R" power supply is <19 vac  
or >30 vac  
Off  
Control is non-functional  
Fault Retry  
Open  
Open  
8
PM Warning  
Performance Monitor  
Warning has occurred.  
Open  
Slow Flash  
Fast Flash  
9
FPI and FP2  
Thermistors are  
swapped  
FP1 temperature is higher than  
FP2 in heating/test mode, or FP2  
temperature is higher than FP1  
in cooling/test mode.  
Over/Under Voltage Shutdown  
Lockout  
(Closed after  
15 minutes)  
Closed  
Flashing Code 1 Test Mode — No fault in memory  
Flashing Code 2 Test Mode — HP Fault in memory  
Flashing Code 3 Test Mode — LP Fault in memory  
Flashing Code 4 Test Mode — FP1 Fault in memory  
Flashing Code 5 Test Mode — FP2 Fault in memory  
Cycling Code 1  
Cycling Code 2  
Cycling Code 3  
Cycling Code 4  
Cycling Code 5  
LEGEND  
FP  
HP  
LP  
Freeze Protection  
High Pressure  
Low Pressure  
Test Mode — Over/Under shut-  
Flashing Code 7  
Cycling Code 7  
Cycling Code 8  
Cycling Code 9  
down in memory  
Flashing Code 8  
Flashing Code 9  
Test Mode — PM in memory  
Test Mode — FP1/FP2 swapped  
fault in memory  
LEGEND  
FP  
Freeze Protection  
HP  
LED  
LP  
High Pressure  
Light-Emitting Diode  
Low Pressure  
Performance Monitor  
PM  
NOTES:  
1. Slow flash is 1 flash every 2 seconds.  
2. Fast flash is 2 flashes every 1 second.  
3. EXAMPLE: “Flashing Code 2is represented by 2 fast flashes followed  
by a 10-second pause. This sequence will repeat continually until the  
fault is cleared.  
17  
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Table 12 — Aquazone™ Deluxe D Control Current LED Status and Alarm Relay Operations  
STATUS LED  
(Green)  
TEST LED  
(Yellow)  
DESCRIPTION  
Normal Mode  
FAULT LED (Red)  
Flash Last Fault Code in Memory  
Flashing Code 8  
ALARM RELAY  
On  
Off  
Open  
Cycle (closed 5 sec,  
open 25 sec, …)  
Normal Mode with PM  
On  
Off  
Control is Non-Functional  
Test Mode  
Off  
Off  
On  
Off  
Open  
Flash Last Fault Code in Memory  
Flash Last Fault Code in Memory  
Flash Last Fault Code in Memory  
Flash Last Fault Code in Memory  
Flashing Code 1  
Cycling Appropriate Code  
Night Setback  
ESD  
Invalid T-stat Inputs  
No Fault in Memory  
HP Fault  
Flashing Code 2  
Flashing Code 3  
Flashing Code 4  
On  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Open  
Slow Flash  
Slow Flash  
Slow Flash  
Slow Flash  
Slow Flash  
Slow Flash  
Fast Flash  
Fast Flash  
Fast Flash  
Fast Flash  
Fast Flash  
Flashing Code 2  
Open  
LP Fault  
FP1 Fault  
FP2 Fault  
CO Fault  
Flashing Code 3  
Open  
Flashing Code 4  
Open  
Flashing Code 5  
Open  
Flashing Code 6  
Open  
Over/Under Voltage  
HP Lockout  
LP Lockout  
Flashing Code 7  
Open (closed after 15 minutes)  
Flashing Code 2  
Closed  
Closed  
Closed  
Closed  
Closed  
Flashing Code 3  
FP1 Lockout  
FP2 Lockout  
CO Lockout  
Flashing Code 4  
Flashing Code 5  
Flashing Code 6  
LEGEND  
NOTES:  
1. If there is no fault in memory, the Fault LED will flash code 1.  
2. Codes will be displayed with a 10-second Fault LED pause.  
3. Slow flash is 1 flash every 2 seconds.  
CO  
ESD  
FP  
Condensate Overflow  
Emergency Shutdown  
Freeze Protection  
High Pressure  
Low Pressure  
Performance Monitor  
4. Fast flash is 2 flashes every 1 second.  
HP  
LP  
5. EXAMPLE: “Flashing Code 2is represented by 2 fast flashes followed  
by a 10-second pause. This sequence will repeat continually until the  
fault is cleared.  
PM  
Check P trap frequently for proper operation.  
SERVICE  
Perform the procedures outlined below periodically, as  
indicated.  
CAUTION  
To avoid fouled machinery and extensive unit clean-up,  
DO NOT operate units without filters in place. DO NOT  
use equipment as a temporary heat source during  
construction.  
IMPORTANT: When a compressor is removed from this  
unit, system refrigerant circuit oil will remain in the com-  
pressor. To avoid leakage of compressor oil, the refrigerant  
lines of the compressor must be sealed after it is removed.  
IMPORTANT: To avoid the release of refrigerant into the  
atmosphere, the refrigerant circuit of this unit must only be  
serviced by technicians which meet local, state and federal  
proficiency requirements.  
Refrigerant System — Verify air and water flow rates  
are at proper levels before servicing. To maintain sealed circuit-  
ry integrity, do not install service gages unless unit operation  
appears abnormal.  
Condenser Cleaning — Water-cooled condensers may  
require cleaning of scale (water deposits) due to improperly  
maintained closed-loop water systems. Sludge build-up may  
need to be cleaned in an open water tower system due to  
induced contaminants.  
IMPORTANT: All refrigerant discharged from this unit  
must be recovered without exception. Technicians must fol-  
low industry accepted guidelines and all local, state and fed-  
eral statutes for the recovery and disposal of refrigerants.  
Local water conditions may cause excessive fouling or  
pitting of tubes. Condenser tubes should therefore be cleaned at  
least once a year, or more often if the water is contaminated.  
Proper water treatment can minimize tube fouling and  
pitting. If such conditions are anticipated, water treatment  
analysis is recommended. Refer to the Carrier System Design  
Manual, Part 5, for general water conditioning information.  
WARNING  
To prevent injury or death due to electrical shock or contact  
with moving parts, open unit disconnect switch before ser-  
vicing unit.  
Water Coil — Keep all air out of the water coil. Check  
open loop systems to be sure the well head is not allowing air  
to infiltrate the water line. Always keep lines airtight.  
CAUTION  
Inspect heat exchangers regularly, and clean more frequent-  
ly if the unit is located in a “dirty” environment. The heat  
exchanger should be kept full of water at all times. Open loop  
systems should have an inverted P trap placed in the discharge  
line to keep water in the heat exchanger during off cycles.  
Closed loop systems must have a minimum of 103 kPa during  
the summer and 276 kPa during the winter.  
Follow all safety codes. Wear safety glasses and rubber  
gloves when using inhibited hydrochloric acid solution.  
Observe and follow acid manufacturer’s instructions.  
Clean condensers with an inhibited hydrochloric acid solu-  
tion. The acid can stain hands and clothing, damage concrete,  
and, without inhibitor, damage steel. Cover surroundings to  
guard against splashing. Vapors from vent pipe are not harmful,  
18  
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but take care to prevent liquid from being carried over by the  
gases.  
3. After unit conditions have stabilized, read head pressure  
on discharge line gage.  
Warm solution acts faster, but cold solution is just as effec-  
tive if applied for a longer period.  
NOTE: Operate unit a minimum of 15 minutes before  
checking charge. From standard field-supplied Pressure-  
Temperature chart for R-410A, find equivalent saturated  
condensing temperature.  
GRAVITY FLOW METHOD — Do not add solution faster  
than vent can exhaust the generated gases.  
When condenser is full, allow solution to remain overnight,  
then drain condenser and flush with clean water. Follow acid  
manufacturer’s instructions. See Fig. 12.  
4. Read liquid line temperature on thermometer; then  
subtract from saturated condensing temperature. The dif-  
ference equals subcooling temperature.  
Refrigerant Charging  
WARNING  
FILL CONDENSER WITH  
CLEANING SOLUTION. DO  
PAIL  
NOT ADD SOLUTION  
MORE RAPIDLY THAN  
VENT CAN EXHAUST  
GASES CAUSED BY  
To prevent personal injury, wear safety glasses and gloves  
when handling refrigerant. Do not overcharge system —  
this can cause compressor flooding.  
FUNNEL  
CHEMICAL ACTION.  
1-IN.  
(25 mm)  
PIPE  
NOTE: Do not vent or depressurize unit refrigerant to atmo-  
sphere. Remove and recover refrigerant following accepted  
practices.  
VENT  
PIPE  
1.5 m APPROX  
1.0 TO 1.2 m  
CONDENSER  
TROUBLESHOOTING  
When troubleshooting problems with a WSHP, refer to  
Table 13.  
Thermistor — A thermistor may be required for single-  
phase units where starting the unit is a problem due to low  
voltage. See Fig. 14 for thermistor nominal resistance.  
PAIL  
Control Sensors — The control system employs 2 nom-  
inal 10,000 ohm thermistors (FP1 and FP2) that are used for  
freeze protection. Be sure FP1 is located in the discharge fluid  
and FP2 is located in the air discharge. See Fig. 15.  
Fig. 12 — Gravity Flow Method  
FORCED CIRCULATION METHOD — Fully open vent  
pipe when filling condenser. The vent may be closed when  
condenser is full and pump is operating. See Fig. 13.  
90.0  
80.0  
70.0  
60.0  
50.0  
40.0  
30.0  
20.0  
10.0  
0.0  
GAS VENT  
PUMP  
PRIMING  
CONN.  
GLOBE  
VALVES  
SUCTION  
SUPPLY  
PUMP  
SUPPORT  
1-IN.  
(25 mm)  
PIPE  
CONDENSER  
TANK  
REMOVE WATER  
REGULATING VALVE  
-17.7  
-6.6  
4.4  
15.6  
26.7  
37.8  
48.9  
60.0  
Temperature (C)  
RETURN  
FINE MESH  
SCREEN  
Fig. 14 — Thermistor Nominal Resistance  
Fig. 13 — Forced Circulation Method  
Regulate flow to condenser with a supply line valve. If  
pump is a nonoverloading type, the valve may be fully closed  
while pump is running.  
For average scale deposit, allow solution to remain in con-  
denser overnight. For heavy scale deposit, allow 24 hours.  
Drain condenser and flush with clean water. Follow acid manu-  
facturer’s instructions.  
Checking System Charge — Units are shipped with  
full operating charge. If recharging is necessary:  
1. Insert thermometer bulb in insulating rubber sleeve on  
liquid line near filter drier. Use a digital thermometer for  
all temperature measurements. DO NOT use a mercury  
or dial-type thermometer.  
2. Connect pressure gage to discharge line near compressor.  
19  
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AIR  
COIL  
SUCTION  
AIRFLOW  
(°C)  
AIRFLOW  
(°C)  
COMPRESSOR  
THERMISTOR  
EXPANSION  
VALVE  
COAX  
DISCHARGE  
FP2  
FP1  
a50-8163  
CONDENSATE  
OVERFLOW  
(CO)  
LIQUID  
LINE  
WATER IN  
WATER OUT  
AIR COIL  
WATER  
COIL  
PROTECTION  
FREEZE  
a50-8592  
PROTECTION  
LEGEND  
COAX — Coaxial Heat Exchanger  
Airflow  
Refrigerant Liquid Line Flow  
Fig. 15 — FP1 and FP2 Thermistor Location  
20  
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Table 13 — Troubleshooting  
FAULT  
HEATING COOLING  
POSSIBLE CAUSE  
SOLUTION  
Main Power Problems  
X
X
Green Status LED Off  
Check line voltage circuit breaker and disconnect.  
Check for line voltage between L1 and L2 on the contactor.  
Check for 24-vac between R and C on controller.  
Check primary/secondary voltage on transformer.  
Check pump operation or valve operation/setting.  
Check water flow adjust to proper flow rate.  
HP Fault — Code 2  
High Pressure  
X
X
Reduced or no water flow in  
cooling  
Water temperature out of range Bring water temperature within design parameters.  
in cooling  
X
X
X
X
X
X
X
Overcharged with refrigerant  
Bad HP switch  
Check superheat/subcooling vs. typical operating condition.  
Check switch continuity and operation. Replace.  
Check for refrigerant leaks.  
LP/LOC Fault — Code 3  
Low Pressure/Loss of  
Charge  
Insufficient charge  
Compressor pump down at  
start-up  
Check charge and start-up water flow.  
FP1 Fault — Code 4  
Source Water Freeze  
Protection  
X
Reduced or no water flow in  
heating  
Check pump operation or water valve operation/setting.  
Plugged strainer or filter. Clean or replace.  
Check water flow adjust to proper flow rate.  
Check antifreeze density with hydrometer.  
X
X
Inadequate antifreeze level  
Improper freeze protect setting Clip JW3 jumper for antifreeze (–12.2 C) use.  
(–1.1 C vs –12.2 C)  
X
X
Water temperature out of range Bring water temperature within design parameters.  
X
X
Bad thermistor  
Check temperature and impedance correlation.  
Check pump operation or water valve operation/setting.  
Plugged strainer or filter. Clean or replace.  
FP2 Fault — Code 5  
Load Coil Freeze  
Protection  
Reduced or no water flow in  
heating  
Check water flow adjust to proper flow rate.  
X
Improper freeze protect setting Clip JW3 jumper for antifreeze (–12.2 C) use.  
(–1.1 C vs –12.2 C)  
X
X
X
Water temperature out of range Bring water temperature within design parameters.  
X
X
Bad thermistor  
Under voltage  
Check temperature and impedance correlation.  
Check power supply and 24-vac voltage before and during operation.  
Check power supply wire size.  
Over/Under Voltage —  
Code 7  
(Auto Resetting)  
Check compressor starting.  
Check 24-vac and unit transformer tap for correct power supply voltage.  
Check power supply voltage and 24-vac before and during operation.  
Check 24-vac and unit transformer tap for correct power supply voltage.  
Check for overcharged unit.  
X
X
X
X
Over voltage  
Performance Monitor —  
Code 8  
Heating mode FP2>51.7 C  
Cooling mode FP1>51.7 C OR Check for poor water flow or airflow.  
FP2< 4.4 C  
No Fault Code Shown  
Unit Short Cycles  
X
X
X
X
X
X
X
X
X
X
X
X
X
No compressor operation  
Compressor overload  
Control board  
See scroll compressor rotation section.  
Check and replace if necessary.  
Reset power and check operation.  
Unit in Test mode  
Unit selection  
Reset power or wait 20 minutes for auto exit.  
Unit may be oversized for space. Check sizing for actual load of space.  
Check and replace if necessary.  
Compressor overload  
Reversing valve  
Unit Does Not Operate in  
Cooling  
Set for cooling demand and check 24-vac on RV coil and at control.  
If RV is stuck, run high pressure up by reducing water flow and while operat-  
ing engage and disengage RV coil voltage to push valve.  
X
X
X
X
X
X
X
Thermostat setup  
Check for ‘O’ RV setup not ‘B’.  
Thermostat wiring  
Check O wiring at heat pump. Jumper O and R for RV coil.  
Check superheat and subcooling.  
Insufficient Capacity/  
Not Cooling or Heating  
Properly  
X
X
Low refrigerant charge  
Restricted metering device  
Defective reversing valve  
Check superheat and subcooling. Replace.  
Perform RV touch test.  
X
X
Thermostat improperly located Check location and for air drafts behind thermostat.  
Unit undersized Recheck loads and sizing. Check sensible cooling load and heat pump  
capacity.  
Scaling in water heat exchanger Perform scaling check and clean if necessary.  
Inlet water too hot or cold Check load, loop sizing, loop backfill, ground moisture.  
Scaling in water heat exchanger Perform scaling check and clean if necessary.  
X
X
X
X
X
X
X
X
High Head Pressure  
X
X
X
X
Unit overcharged  
Check superheat and subcooling. Reweigh in charge.  
Vacuum system and reweigh in charge.  
Non-condensables in system  
Restricted metering device  
Reduced water flow in heating  
Check superheat and subcooling. Replace.  
Check pump operation or water valve operation/setting.  
Plugged strainer or filter. Clean or replace.  
Check water flow adjust to proper flow rate.  
Low Suction Pressure  
X
Water temperature out of range Bring water temperature within design parameters.  
LEGEND  
FP  
HP  
Freeze Protection  
High Pressure  
LED — Light-Emitting Diode  
LOC — Loss of Charge  
LP  
RV  
Low Pressure  
Reversing Valve  
21  
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Copyright 2010 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Catalog No. 04-53500073-01  
Printed in U.S.A.  
Form 50PSW-C1SI  
Pg 22  
10-10  
Replaces: New  
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50PSW  
START-UP CHECKLIST  
CUSTOMER:___________________________  
MODEL NO.:___________________________  
LOOP TYPE:___________________________  
JOB NAME: _______________________________________  
SERIAL NO.:____________________  
DATE:_________  
ANTIFREEZE TYPE AND %:_________________________  
I. PRE-START-UP  
DOES THE UNIT VOLTAGE CORRESPOND WITH THE SUPPLY VOLTAGE AVAILABLE? (Y/N)  
HAVE THE POWER AND CONTROL WIRING CONNECTIONS BEEN MADE AND TERMINALS  
TIGHT? (Y/N)  
HAVE WATER CONNECTIONS BEEN MADE AND IS FLUID AVAILABLE AT HEAT EXCHANGER?  
(Y/N)  
HAS PUMP BEEN TURNED ON AND ARE ISOLATION VALVES OPEN? (Y/N)  
HAS CONDENSATE CONNECTION BEEN MADE AND IS A TRAP INSTALLED? (Y/N)  
IS AN AIR FILTER INSTALLED? (Y/N)  
II. START-UP  
IS FAN OPERATING WHEN COMPRESSOR OPERATES? (Y/N)  
IF 3-PHASE SCROLL COMPRESSOR IS PRESENT, VERIFY PROPER ROTATION PER INSTRUCTIONS.  
(Y/N)  
UNIT VOLTAGE — COOLING OPERATION  
PHASE AB VOLTS  
PHASE BC VOLTS  
(if 3 phase)  
PHASE CA VOLTS  
(if 3 phase)  
PHASE AB AMPS  
PHASE BC AMPS  
(if 3 phase)  
PHASE CA AMPS  
(if 3 phase)  
CONTROL VOLTAGE  
IS CONTROL VOLTAGE ABOVE 21.6 VOLTS? (Y/N)  
.
IF NOT, CHECK FOR PROPER TRANSFORMER CONNECTION.  
TEMPERATURES  
FILL IN THE ANALYSIS CHART ATTACHED.  
COAXIAL HEAT COOLING CYCLE:  
EXCHANGER  
FLUID IN  
C
C
C
C
FLUID OUT  
FLUID OUT  
AIR OUT  
C
KPA  
KPA  
FLOW  
FLOW  
HEATING CYCLE:  
FLUID IN  
C
C
C
AIR COIL  
COOLING CYCLE:  
AIR IN  
HEATING CYCLE:  
AIR IN  
AIR OUT  
CL-1  
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HEATING AND COOLING CYCLE ANALYSIS  
HEATING POSITION  
COOLING POSITION  
WATER-TO-WATER UNITS  
REFRIG FLOW - HEATING  
REFRIG FLOW - COOLING  
REVERSING  
VALVE  
11 13  
2
1
SUCTION  
CONDENSER (COOLING)  
Load  
EVAPORATOR (HEATING)  
COMPRESSOR  
DISCHARGE  
10 12  
3
4
EXPANSION  
VALVE  
COAX  
FILTER  
DRIER  
CONDENSER (HTG)  
EVAPORATOR (CLG)  
HWG*  
Source  
FP2:  
5
FP1:  
5
HEATING  
LIQUID  
LINE  
COOLING  
LIQUID  
LINE  
6
8
7
9
LEGEND  
CLG  
HTG  
Cooling  
Heating  
a50-8465  
*Turn off HWG (hot water generator)  
before troubleshooting.  
DESCRIPTION  
Voltage  
HEATING  
COOLING  
NOTES  
Compressor Amp  
1
2
Suction Temperature  
Suction Pressure  
2a Saturation Temperature  
2b Superheat  
3
4
Discharge Temperature  
Discharge Pressure  
4a Saturation Temperature  
4b Subcooling  
5
6
7
8
9
Liquid Line Temperature  
Source Water In Temperature  
Source Water Out Temperature  
Source Water In Pressure  
Source Water Out Pressure  
Temperature Difference —  
Temperature Difference —  
9a Pressure Drop  
9b Flow Rate (L/s)  
10 Load Water In Temperature  
11 Load Water Out Temperature  
12 Load Water In Pressure  
13 Load Water Out Pressure  
13a Pressure Drop  
13b Flow Rate (gpm)  
HEAT OF EXTRACTION (ABSORPTION) OR HEAT OF REJECTION =  
FLOW RATE (L/s) x TEMP. DIFF. (DEG. C) x  
FLUID FACTOR* =  
(kW)  
SUPERHEAT = SUCTION TEMPERATURE – SUCTION SATURATION TEMPERATURE  
(DEG C)  
=
SUBCOOLING = DISCHARGE SATURATION TEMPERATURE – LIQUID LINE TEMPERATURE  
(DEG C)  
=
*Use 500 for water, 485 for antifreeze.  
Copyright 2010 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Catalog No. 04-53500073-01  
Printed in U.S.A.  
Form 50PSW-C1SI  
Pg CL-2  
10-10  
Replaces: New  
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