Carrier AQUAZONE 50RHE006 060 User Manual
Aquazone™  
50RHE006-060  
Water Source Heat Pumps  
Horizontal Unit  
50 Hz, CE Mark  
R-407C  
Installation, Start-Up, and  
Service Instructions  
Page  
CONTENTS  
Ground Coupled, Closed Loop and Plateframe  
Page  
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . .1,2  
GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16  
Step 1 — Check Jobsite . . . . . . . . . . . . . . . . . . . . . . . . 2  
Step 2 — Check Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
• STORAGE  
Heat Exchanger Well Systems . . . . . . . . . . . . . . . . 21  
OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21,22  
Power Up Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
Units with Aquazone Complete C Control . . . . . . . 21  
Units with Aquazone Deluxe D Control . . . . . . . . . . 21  
SYSTEM TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22,23  
Test Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22  
Retry Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
Aquazone Deluxe D Control LED Indicators . . . . . 23  
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23-25  
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
Water Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
Condensate Drain Pans . . . . . . . . . . . . . . . . . . . . . . . . . 24  
Refrigerant System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24  
Condensate Drain Cleaning . . . . . . . . . . . . . . . . . . . . . 24  
Air Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24  
Condenser Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24  
Checking System Charge . . . . . . . . . . . . . . . . . . . . . . . 24  
Refrigerant Charging. . . . . . . . . . . . . . . . . . . . . . . . . . . . 25  
Air Coil Fan Motor Removal . . . . . . . . . . . . . . . . . . . . . 25  
• PROTECTION  
• INSPECT UNIT  
Step 3 — Unit Location. . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
• FIELD CONVERSION OF DISCHARGE AIR  
Step 4 — Mounting the Unit . . . . . . . . . . . . . . . . . . . . . . 7  
Step 5 — Duct System . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
• SOUND ATTENUATION  
• EXISTING DUCT SYSTEM  
Step 6 — Condensate Drain . . . . . . . . . . . . . . . . . . . . . . 7  
• VENTING  
Step 7 — Piping Connections . . . . . . . . . . . . . . . . . . . . 8  
• WATER LOOP APPLICATIONS  
• GROUND-WATER APPLICATIONS  
• GROUND-LOOP APPLICATIONS  
Step 8 — Electrical Wiring. . . . . . . . . . . . . . . . . . . . . . . . 9  
• POWER CONNECTION  
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 25-27  
Thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25  
Control Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25  
• SUPPLY VOLTAGE  
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . CL-1, CL-2  
• 220-VOLT OPERATION  
• PSC BLOWER SPEED SELECTION  
Step 9 — Low Voltage Wiring. . . . . . . . . . . . . . . . . . . . 16  
• THERMOSTAT CONNECTIONS  
IMPORTANT: Read the entire instruction manual before  
starting installation.  
• WATER FREEZE PROTECTION  
• AIR COIL FREEZE PROTECTION  
• ACCESSORY CONNECTIONS  
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.  
• WATER SOLENOID VALVES  
PRE-START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16,17  
System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
FIELD SELECTABLE INPUTS . . . . . . . . . . . . . . . .17,18  
C Control Jumper Settings . . . . . . . . . . . . . . . . . . . . 17  
C Control DIP Switches . . . . . . . . . . . . . . . . . . . . . . . 17  
D Control Jumper Settings . . . . . . . . . . . . . . . . . . . . 17  
D Control DIP Switches . . . . . . . . . . . . . . . . . . . . . . . 17  
D Control Accessory Relay Configurations . . . . . 18  
Water Valve (Slow Opening) . . . . . . . . . . . . . . . . . . . 18  
Outdoor Air Damper (OAD) . . . . . . . . . . . . . . . . . . . . 18  
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-21  
Operating Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Scroll Compressor Rotation. . . . . . . . . . . . . . . . . . . . . 19  
Unit Start-Up Cooling Mode . . . . . . . . . . . . . . . . . . . . . 19  
Unit Start-Up Heating Mode . . . . . . . . . . . . . . . . . . . . . 19  
Flow Regulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
Flushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20  
Antifreeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
Cooling Tower/Boiler Systems . . . . . . . . . . . . . . . . . . 21  
Untrained personnel can perform basic maintenance func-  
tions of cleaning coils and filters and replacing filters. All other  
operations should be performed by trained service personnel.  
When working on air-conditioning equipment, observe precau-  
tions 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.  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Catalog No. 005-00042 Printed in U.S.A. Form 50RHE-C1SI Pg 1 2-04 Replaces: New  
Book 1  
4
Tab 5a 5a  
3. Do not remove the packaging until the unit is ready for  
installation.  
4. Verify that the refrigerant tubing is free of kinks or dents,  
and that it does not touch other unit components.  
5. Inspect all electrical connections. Be sure connections are  
clean and tight at the terminals.  
6. Compressors are internally isolated. Compressors  
equipped with external spring vibration isolators must  
have bolts loosened and shipping clamps removed.  
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.  
7. Remove any blower support cardboard from inlet of the  
blower.  
8. Locate and verify any accessory kit located in compressor  
section.  
9. Remove any access panel screws that may be difficult to  
remove once unit is installed.  
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.  
Table 1 — Physical Data — Aquazone™ 50RHE006-060 Units  
UNIT 50RHE  
COMPRESSOR (1 each)  
FACTORY CHARGE R-407C (kg)  
006  
009  
012  
015  
019  
024  
030  
036  
042  
048  
060  
Scroll  
2.41  
Rotary  
Reciprocating  
0.34  
0.37  
0.37  
0.68  
0.88  
0.91  
1.19  
1.36  
1.19  
1.59  
PSC FAN MOTOR AND BLOWER  
Fan Motor Type/Speeds  
PSC/3  
PSC/3  
PSC/3  
PSC/3  
PSC/3  
PSC/3  
PSC/3  
PSC/3  
PSC/3  
PSC/3  
PSC/3  
1 [746]  
279 x 254  
1
1
1
1
1
1
1
3
3
3
Fan Motor (Hp) [w]  
/25 [30]  
/
10 [75]  
/
10 [75]  
/
6 [124]  
/
5 [150]  
/
3 [250]  
/
2 [373]  
/
4 [560]  
/
4 [560]  
/4 [560]  
Blower Wheel Size (D x W) (mm)  
127 x 127 127 x 127 152 x 127 152 x 127 152 x 127 152 x 127 152 x 127 254 x 254 254 x 254 254 x 254  
1
1
1
3
3
3
3
3
/
2
/
2
/
2
/
4
/
4
/
4
/
4
/
4
1
1
1
WATER CONNECTION SIZE (in.) (FPT)  
HORIZONTAL  
Air Coil  
Dimensions (H x W) (mm)  
Total Face Area (m2)  
Tube Size (mm)  
254 x 406  
0.103  
9.5  
406 x 406  
0.165  
457 x 559  
0.255  
457 x 787  
508 x 889  
0.452  
0.360  
9.5  
2.2  
3
9.5  
2.2  
3
9.5  
2.2  
3
9.5  
Distance Between Fins (mm)  
Number of Rows  
Filter Standard Throwaway  
(Qty — Size, mm)  
Weight 25.4-mm (kg)  
Operating  
2.2  
2.7  
2
3
4
1 — 305 x 508  
1 — 635 x 508  
1 — 254 x 508  
1 — 406 x 508  
1 — 457 x 610  
2 — 457 x 457  
50.0  
54.5  
50.9  
55.5  
55.0  
59.5  
66.8  
71.4  
76.8  
81.4  
87.7  
92.3  
99.5  
105.0  
104.1  
109.5  
116.8  
122.3  
121.4  
126.8  
146.8  
153.6  
Packaged  
LEGEND  
PSC — Permanent Split Capacitor  
NOTES:  
1. All units have spring compressor mountings, TXV (thermostatic expan-  
sion valve) expansion devices, and 1/2- and 3/4-in. electrical knockouts.  
2. Size 048 available as high-static unit.  
3
WATER  
CONNECTIONS  
ELECTRICAL KNOCKOUTS (in.)  
OVERALL  
CABINET  
DISCHARGE CONNECTION  
RETURN CONNECTION  
Duct Flange Installed ( 0.10 in.)  
Using Return Air Opening  
J
K
L
50RHE  
UNITS  
1
2
3
1
1
3
/
Loop  
Water  
FPT  
/
conduit  
/
conduit  
conduit  
2
2
4
F
L
M
P
Q
A
B
C
D
E
Low  
Voltage  
Ext  
Pump  
Power  
Supply  
Cond-  
ensate  
J
K
Supply Supply  
Height Depth  
N
O
Return Return  
Depth Height  
R
S
(in.)  
Width Depth Height In Out  
in.  
22.4  
56.8  
43.1  
11.3  
28.7  
2.4  
5.4  
0.6  
1.5  
3.5  
8.9  
5.5  
8.2  
5.8  
4.0  
5.8  
8.0  
5.8  
1.5  
3.8  
17.1  
43.4  
9.3  
2.2 1.0  
5.6 2.5  
1
006-012  
015-024  
030  
/
/
/
/
2
4
4
4
cm  
109.5  
6.1 13.7  
14.0  
20.8  
14.7 10.2  
14.7  
20.3  
14.7  
23.6  
in.  
cm  
22.4  
56.8  
43.1  
109.5  
17.3  
43.9  
2.4 4.9  
6.1 12.4  
2.4 5.4  
6.1 13.7  
2.4 5.4  
6.1 13.7  
2.4 5.4  
6.1 13.7  
2.4 5.4  
6.1 13.7  
0.6  
1.5  
3.5  
8.9  
7.5  
19.1  
10.2  
25.9  
5.0  
12.7 14.2  
5.6  
10.4  
26.4  
9.3  
23.6  
5.0  
12.7  
1.5  
3.8  
17.1  
43.4  
15.3  
38.9  
2.2 1.0  
5.6 2.5  
3
3
3
in.  
cm  
22.4  
56.8  
53.2  
135.1  
19.3  
49.0  
0.6  
1.5  
5.7  
14.5  
9.7  
24.6  
12.2  
31.0  
5.0 6.8  
12.7 17.3  
10.4  
26.4  
9.3  
23.6  
5.0  
12.7  
2.1  
5.3  
23.1  
58.7  
17.3  
43.9  
2.2 1.0  
5.6 2.5  
in.  
cm  
22.4  
56.8  
53.2  
135.1  
19.3  
49.0  
0.6  
1.5  
5.7  
14.5  
9.7  
24.6  
12.2  
31.0  
2.9  
7.4  
3.8  
9.7  
13.5  
34.3  
13.1  
33.3  
2.9  
7.4  
1.9  
4.8  
23.1  
58.7  
17.3  
43.9  
2.2 1.0  
5.6 2.5  
036  
in.  
cm  
22.4  
56.8  
62.2  
158.0  
19.3  
49.0  
0.6  
1.5  
5.7  
14.5  
9.7  
24.6  
12.2  
31.0  
2.9  
7.4  
3.8  
9.7  
13.5  
34.3  
13.1  
33.3  
2.9  
7.4  
1.9  
4.8  
32.1  
81.5  
17.3  
43.9  
2.2 1.0  
5.6 2.5  
042-048  
060  
1
1
in.  
cm  
25.4  
64.5  
71.2  
180.8  
21.3  
54.1  
0.6  
1.5  
8.1  
20.6  
11.7  
29.7  
14.2  
36.1  
5.8  
14.7 12.7  
5.0  
13.6  
34.5  
13.3  
33.8  
5.8  
14.7  
2.9  
7.4  
36.1  
91.7  
19.3  
49.0  
2.2 1.0  
5.6 2.5  
NOTES:  
3
1. Condensate is / -in. FPT copper.  
4
2. Horizontal unit shipped with filter bracket only. This bracket should be removed for return duct connection (front).  
3. Hanger kit is factory installed. Isolation grommets are provided.  
4. Right and left orientation is determined by looking at water connection side.  
LEFT RETURN  
RIGHT RETURN  
Legend  
CAP=Control Access Panel  
2’ [61cm] Service  
Access *  
Front  
2’ [61cm]  
Service  
Access *  
CSP  
Optional 2’ [61cm]  
Service Access *  
CSP=Compressor Service Panel  
BSP=Blower Service Panel  
ASP=Alternate Service Panel  
Front  
ASP  
Optional 2’ [61cm]  
Service Access *  
Left Return  
Power Supply  
3 / 4” Knockout  
1 / 2”  
Knockout  
Right Return  
3.25  
CSP  
3.25  
[82.6mm]  
[82.6mm]  
Low Voltage  
1 / 2” Knockout  
L
CAP  
K
F
F
Left  
Discharge  
Right  
Discharge  
5
J
2
1
3
E
D
Condensate  
3 / 4” FPT  
Back  
Discharge  
Back  
Discharge  
Condensate  
3 / 4” FPT  
A
Front-View  
Unit Hanger Detail  
R
P
Q
P
BSP  
Blower  
Outlet  
X
Y
Z
BSP  
O
Q
MODEL  
C
C
IN  
CM  
IN  
CM  
IN  
CM  
Blower  
Outlet  
O
R
006-024  
030-036  
042-048  
060  
43.1 109.5  
53.1 134.9  
62.1 157.7  
71.1 180.6  
24.4  
24.4  
24.4  
27.4  
61.9  
61.9  
61.9  
69.5  
20.4  
20.4  
20.4  
23.4  
51.8  
51.8  
51.8  
59.4  
Y
Z
A
A
X
Right Return Back Discharge  
Left Return Back Discharge  
P
M
N
P
Blower  
Outlet  
BSP  
ASP  
BSP  
O
N
CSP  
Blower  
Outlet  
O
Front  
Front  
M
Right Return Left Discharge  
Left Return Right Discharge  
Air Coil  
1
V
C
V
U
S
[27.9mm]  
S
Air Coil  
U
CSP  
ASP  
T
T
C
Front  
Front  
B
B
Left Return Left View -  
Air Coil Opening  
Right Return Right View -  
Air Coil Opening  
* Note: Shaded areas are recommended service areas, not required.  
Fig. 1 — 50RHE Dimensional Data  
4
ReturnLoop  
3/8” threaded rods  
(by others)  
Supply Loop  
Water In  
Filter Access  
Water Out  
Return Air  
(Ductwork  
not shown)  
Thermostat  
Wiring  
Field-supplied transition to  
minimize pressure loss  
Balancing Valve (Field  
Power Wiring  
installed and calibrated  
accessory)  
Field-supplied  
stainless steel  
braid hose  
with integral  
“J” swivel  
Supply Air  
Low Pressure Drop Water  
Control Valve (optional)  
(field-installed accessory)  
Unit Power  
Flexible  
Connection  
Insulated supply duct with  
at least one 90 degree elbow  
to reduce air noise  
Water Out  
Water In  
Unit Power  
Disconnect  
Field-Supplied  
Electric Heat  
(if applicable)  
(field supplied)  
Ball Valve with optional  
integral P/T plug (typical for supply  
and return piping)  
Unit Hanger  
3/8” Threaded  
Rod (by others)  
Vibration Isolator  
(white-compressor end  
and red-blower end)  
size 042-070  
Washer  
(by others)  
Double Hex Nuts  
(by others)  
50RHR, RHS: Install screw as shown  
Sizes 042-060  
Optional on smaller sizes  
50RHC: Screw must only be  
1/2” long to  
Integral hanger support-  
pre-attached in factory  
prevent damage  
UNIT HANGER ISOLATION DETAIL  
Fig. 2 — Typical Installation — 50RHE Units  
5
Remove Screws  
Water  
Step 3 — Unit Location — The following guidelines  
should be considered when choosing a location for a WSHP  
unit:  
Connection End  
Return Air  
• Units are for indoor use only  
• Locate in areas where ambient temperatures are between  
4.4 C and 37.8 C and relative humidity is no greater than  
75%  
• Provide sufficient space for water, electrical and duct  
connections  
• Locate unit in an area that allows easy access and  
removal of filter and access panels  
Side Discharge  
Water  
Connection End  
• Allow enough space for service personnel to perform  
maintenance  
Rotate  
Return Air  
• Return air must be able to freely enter the space if unit  
needs to be installed in a confined area such as a closet  
NOTE: Correct placement of the horizontal unit can play an  
important part in minimizing sound problems. Since duct-  
work is normally applied to these units, the unit can be  
placed so that the principal sound emission is outside the oc-  
cupied space in sound-critical applications. A fire damper  
may be required by the local code if a fire wall is penetrated.  
Move to Side  
FIELD CONVERSION OF DISCHARGE AIR — The dis-  
charge air of the 50RHE horizontal units can be converted  
between side and back discharge in the field. The conversion  
process is the same for right and left return configurations. See  
Fig. 3 and 4.  
Replace Screws  
Water  
Connection End  
Return Air  
NOTE: It is not possible to convert return air between left or  
right return models in the field due to refrigerant piping  
changes.  
Preparation — The unit should be on the ground in a well lit  
area for conversion. Hung units should be taken down to  
ground level before converting.  
Drain  
Discharge Air  
Back Discharge  
Side to Back Discharge Conversion  
1. Remove screws to free the top and discharge panels. See  
Fig. 3.  
2. Remove the access panel and set aside.  
3. Lift the discharge panel from side of unit and rotate it to  
back using care not to damage blower wiring.  
Fig. 3 — Conversion Left Return,  
Side Discharge to Back Discharge  
Water  
Connection End  
Return Air  
4. Check blower wire routing and connections for excessive  
tension or contact with sheet metal edges. Re-route if  
necessary.  
Supply  
Duct  
5. Check refrigerant tubing for contact with other compo-  
nents. Adjust if necessary.  
Side Discharge  
Water  
Connection End  
6. Reinstall top panel using screws set aside in Step 1.  
NOTE: Location for some screws at bottom of discharge panel  
may have to be changed.  
7. Manually spin fan wheel to check for obstructions.  
Adjust for any obstruction found.  
Return Air  
Drain  
8. Replace access panel.  
Back to Side Discharge Conversion — Follow instructions  
above for Side to Back Discharge Conversion, noting the  
panels would be reversed.  
Back Discharge  
Discharge Air  
Fig. 4 — Conversion Right Return,  
Side Discharge to Back Discharge  
6
Step 4 — Mounting the Unit — Horizontal units  
should be mounted using the factory-installed hangers. Proper  
attachment of hanging rods to building structure is critical for  
safety. See Fig. 2 and 5. Rod attachments must be able to sup-  
port the weight of the unit. See Table 1 for unit operating  
weights.  
Step 6 — Condensate Drain — Slope the unit to-  
ward the drain at a 6.5 mm per 30 cm pitch. See Fig. 6. If it is  
not possible to meet the required pitch, install a condensate  
pump at the unit to pump condensate to building drain.  
Horizontal units are not internally trapped; therefore an ex-  
ternal trap is necessary. Install each unit with its own individual  
trap and means to flush or blowout the condensate drain line.  
Do not install units with a common trap or vent. For typical  
condensate connections see Fig. 7.  
Step 5 — Duct System — Size the duct system to han-  
dle the design airflow quietly.  
NOTE: Depending on the unit, the fan wheel may have a ship-  
ping support installed at the factory. This must be removed  
before operating unit.  
NOTE: Never use a pipe size smaller than the connection.  
VENTING — Install a vent in the condensate line of any  
application that may allow dirt or air to collect in the line. Con-  
sider the following:  
SOUND ATTENUATION — To eliminate the transfer of  
vibration to the duct system, a flexible connector is recom-  
mended for both discharge and return air duct connections on  
metal duct systems. The supply and return plenums should  
include internal duct liner of fiberglass or be made of duct  
board construction to maximize sound attenuation of the  
blower. Installing the WSHP unit to uninsulated ductwork in an  
unconditioned space is not recommended since it will sweat  
and adversely affect the unit’s performance.  
• Always install a vent where an application requires a  
long horizontal run.  
• Always install a vent where large units are working  
against higher external static pressure and to allow  
proper drainage for multiple units connected to the same  
condensate main.  
• Be sure to support the line where anticipated sagging from  
the condensate or when “double trapping” may occur.  
• If condensate pump is present on unit, be sure drain con-  
nections have a check valve to prevent back flow of con-  
densate into other units.  
To reduce air noise, at least one 90 degree elbow could be  
included in the supply and return air ducts, provided system  
performance is not adversely impacted. The blower speed can  
also be changed in the field to reduce air noise or excessive air-  
flow, provided system performance is not adversely impacted.  
EXISTING DUCT SYSTEM — If the unit is connected to  
existing ductwork, consider the following:  
• Verify that the existing ducts have the proper capacity to  
handle the unit airflow. If the ductwork is too small,  
install larger ductwork.  
• Check existing ductwork for leaks and repair as  
necessary.  
65 mm Pitch for  
Drainage  
NOTE: Local codes may require ventilation air to enter the  
space for proper indoor air quality. Hard-duct ventilation may  
be required for the ventilating air supply. If hard ducted venti-  
lation is not required, be sure that a proper air path is provided  
for ventilation air to unit to meet ventilation requirement of the  
space.  
Pitch Toward  
Drain  
Drain Connection  
Fig. 6 — Horizontal Unit Pitch  
D
Compressor  
Section  
Air Handler  
Section  
A
E
C
B
DIMENSIONS (mm)  
50RHE UNITS  
A
B
C
D
E
NOTE: Trap should be deep enough to offset maximum unit static  
difference. A 102 mm trap is recommended.  
006-024  
030,036  
042,048  
060  
568  
568  
568  
645  
1095  
1349  
1577  
1806  
619  
619  
619  
695  
1095  
1349  
1577  
1806  
518  
518  
518  
594  
Fig. 7 — Trap Condensate Drain  
Fig. 5 — Horizontal Hanger Bracket  
(Factory Installed)  
7
In addition to complying with any applicable codes, consid-  
er the following for system piping:  
• Piping systems using water temperatures below 10 C  
require 12.7 mm closed cell insulation on all piping  
surfaces to eliminate condensation.  
• Avoid all plastic to metal threaded fittings 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.  
• Flush the piping system prior to operation to remove dirt  
and foreign materials from the system.  
Step 7 — Piping Connections — Depending on the  
application, there are 3 types of WSHP piping systems to  
choose from: water loop, ground-water and ground loop. Refer  
to Piping Section of Carrier System Design Manual for addi-  
tional information.  
All WSHP units use 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. Refer to Table 1 for  
connection sizes. When making piping connections, consider  
the following:  
• Use a backup wrench when making screw connections 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  
should be used to isolate the steel parts of the system to  
avoid galvanic corrosion.  
GROUND-WATER APPLICATIONS — Typical ground-  
water piping is shown in Fig. 8. In addition to complying  
with any applicable codes, consider the following for sys-  
tem piping:  
• Install shut-off valves for servicing.  
• Install pressure-temperature plugs to measure flow and  
temperature.  
WATER LOOP APPLICATIONS — Water loop applications  
usually include a number of units plumbed to a common pip-  
ing 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.  
• Connect boiler drains and other valves using a “T” con-  
nector 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.  
The flow rate is usually set between 0.040 and 0.054 l/s per  
kW of cooling capacity. For proper maintenance and servicing,  
pressure-temperature (P/T) ports are necessary for temperature  
and flow verification.  
NOTE: PVC SCH40 should not be used due to system high  
pressure and temperature extremes.  
Water  
Control  
Valve  
Flow  
Regulator  
Pressure  
Tank  
Water Out  
Water In  
From Pump  
Shut-Off  
Valve  
Strainer – Field-Installed Accessory  
(16 to 20 mesh recommended for  
filter sediment)  
Boiler  
Drains  
Pressure-  
Temperature  
Plugs  
Fig. 8 — Typical Ground-Water Piping Installation  
8
Water Supply and Quantity — Check water supply. Water  
supply should be plentiful and of good quality. See Table 2 for  
water quality guidelines.  
Step 8 — Electrical Wiring  
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.  
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.  
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.  
Use only copper conductors for field-installed electrical  
wiring. Unit terminals are not designed to accept other  
types of conductors.  
All field installed wiring, including the electrical ground,  
MUST comply with applicable local, national and regional  
codes.  
Refer to unit wiring diagrams Fig. 9-12 for a schematic of  
the field connections, which must be made by the installing (or  
electrical) contractor. Refer to Electrical Data for fuse sizes.  
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.  
Operating voltage must be the same voltage and phase as  
shown in Electrical Data shown in Table 3.  
GROUND-LOOP APPLICATIONS — Temperatures between  
–4 to 43 C and a liquid flow rate of 0.040 to 0.054 l/s per kW of  
cooling capacity is recommended. In addition to complying  
with any applicable codes, consider the following for system  
piping:  
• Limit piping materials to only polyethylene fusion in the  
buried sections of the loop.  
• Do not use galvanized or steel fittings at any time due to  
corrosion.  
• Avoid all plastic to metal threaded fittings due to the  
potential to leak. Use a flange fitted substitute.  
• Do not overtighten connections.  
• Route piping to avoid service access areas to unit.  
• Use pressure-temperature (P/T) plugs to measure flow of  
pressure drop.  
Make all final electrical connections with a length of flexi-  
ble conduit to minimize vibration and sound transmission to  
the building.  
Table 2 — Water Quality Guidelines  
CONDITION  
pH  
Total  
Hardness  
ACCEPTABLE LEVEL  
7 to 9 range for copper. Cupronickel may be used in the 5 to 9 range.  
Calcium and magnesium carbonate should not exceed 350 ppm.  
Iron Oxides  
Less than 1 ppm.  
Iron Bacteria No level allowable.  
Corrosion*  
Max Allowable Level  
0.5 ppm  
Coaxial Metal  
Ammonia, Ammonium Hydroxide  
Cu  
Cu  
Ammonium Chloride, Ammonium Nitrate  
Ammonium Sulfate  
0.5 ppm  
0.5 ppm  
Cu  
CuNi  
—
Chlorine/Chlorides  
Hydrogen Sulfide†  
0.5 ppm  
None Allowable  
Brackish  
Use Cupronickel heat exchanger when concentrations of calcium or sodium chloride are  
greater than 125 ppm are present. (Seawater is approximately 25,000 ppm.)  
*If the concentration of these corrosives exceeds the maximum allowable level, then the potential for serious cor-  
rosion problems exists.  
†Sulfides in the water quickly oxidize when exposed to air, requiring 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.  
NOTE: Hardness in mg/l is equivalent to ppm.  
9
G/Y  
G/Y  
PB  
6
START ASSIST  
(WHEN NEEDED)  
EARTH (GRD)  
5
4
3
2
POWER SUPPLY  
REFER TO  
DATA PLATE  
USE COPPER  
CONDUCTORS  
ONLY  
RED*  
RED  
BLU*  
BLU  
R
CAP  
YEL  
RED  
BLK  
S
C
6
8
N (NEUTRAL)  
L
RED  
CR  
2
4
1
COMPRESSOR  
BLK  
BLK  
2
4
BR  
CAPACITOR  
BRN  
YEL  
6
8
PSC  
(
)
)
)
L 3  
YEL OR WHT  
BLU  
FAN  
(
M 2  
MTR  
(
H 1  
SEE NOTE 3  
TRANS  
3 AIR FLOW SETTINGS  
(FCTRY SETTING - MED)  
CB*  
YEL  
BLK  
RED  
SEE NOTE 8  
G/Y  
24V  
COMPONENT LOCATION  
CR  
220V  
BLU  
ORG  
240V  
SEE  
NOTE 7  
CAP  
BR  
1
0
CR  
BR  
BRN  
GRY  
YEL  
CC  
BRN  
SEE  
NOTE 7  
BR BRG CCG  
TEST PINS  
C
PB  
COMPRESS.  
RELAY  
SEE  
1
R
Y
RED  
RED  
HP  
HP  
NOTE 5  
2
3
TYPICAL  
T-STAT  
Y
SEE  
BLU  
BRN  
GRY  
TRANS  
LOC  
LOC  
COMPR.  
NOTE 4  
4
5
SIZES: 015-036  
Y
SEE NOTE 4  
FP1  
JW3  
DIP SWITCH  
FP1  
PM  
1
FP1  
W
LOW TEMP  
STAGE 2  
2
GRY  
6
7
COOLING  
FAN  
NOT USED  
3
(
)
TXV UNITS  
FP2  
O
G
R
C
L
JW2  
VIO  
O
G
NOT USED  
1 OR 3  
TRIES  
4
5
VIO  
VIO  
FP2  
(
CAP -TUBE  
FP2  
LOW TEMP  
)
UNITS OR  
8
9
24 VAC  
OFF ON  
R
BRN  
RV  
COMMON  
ALARM  
RVS  
CO  
10  
ORG  
NOT USED  
YEL  
C
STATUS  
LED  
G
JWI  
AL1  
AL2  
CO 12  
P2  
SEE NOTE 6 FOR  
DRY ALARM CONTACT  
CXM  
MICRO-  
PROCESSOR  
CONTROL LOGIC  
SEE  
ALARM  
A
PI  
NOTE  
6
RELAY  
24V  
DC  
CR  
PB  
EH1  
EH2  
P3  
CAP  
CO  
BR  
TRANS  
SIZES: 006, 009, 012  
LEGEND  
AL  
BR  
— Alarm Relay Contacts  
— Blower Relay  
PM  
— Performance Monitor  
Condensate Pan  
Circuit Breaker  
PSC  
RVS  
— Permanent Split Capacitor  
— Reversing Valve Solenoid  
CAP — Compressor Capacitor  
CB  
CC  
CO  
FP1  
FP2  
— Circuit Breaker  
— Compressor Contactor  
— Sensor, Condensate Overflow  
— Sensor, Water Coil Freeze Protection  
— Sensor, Air Coil Freeze Protection  
TRANS — Transformer Optional Wiring  
Field Line Voltage Wiring  
Field Low Voltage Wiring  
Printed Circuit Trace  
Relay Contacts — N.C.  
Solenoid Coil  
Relay Contacts — N.O.  
Switch Temperature  
Switch Low Pressure  
Ground  
GND — Ground  
Optional Wiring  
HP  
JW  
— High-Pressure Switch  
— Clippable Field Selection Jumper  
Relay/Contactor Coil  
LOC — Loss of Charge Pressure Switch  
P1  
PB  
— Field Wiring Terminal Block  
— Power Block  
Thermistor  
Wire Nut  
*Optional wiring.  
NOTES:  
1. Compressor and blower motor thermally protected internally.  
2. All wiring to the unit must comply with NEC and local codes.  
3. Transformer is wired to 240 v (ORG) lead for 240/50/1 units,  
switch RED and ORG leads to PB(1) and insulate ORG lead.  
4. FP1 thermistor provides freeze protection for water. When using  
antifreeze solutions, cut JW3 jumper.  
6. 24-v alarm signal shown. For dry alarm contact, cut JW1 jumper,  
and dry contact will be available between AL1 and AL2.  
7. Transformer secondary ground via microprocessor board stand-  
offs and screws to control box. (Ground available from top two  
standoffs as shown.)  
8. Fan motors factory wired for medium speed. For high or low  
speed remove BLU wire from fan motor speed tap “M” and con-  
nect to “H” for high or “L” for low.  
5. Typical heat pump thermostat wiring shown. Refer to thermostat  
installation instructions for wiring to the unit.  
Fig. 9 — Typical Aquazone™ Complete C Control Wiring (Single-Phase Unit)  
10  
PB  
6
G/Y  
G/Y  
G/Y  
EARTH (GND)  
N (NEUTRAL)  
5
4
3
2
1
GROUND  
LUG  
POWER SUPPLY  
REFER TO  
L3  
T3  
BLK  
BLK  
BLK  
BLK  
DATA PLATE  
USE COPPER  
CONDUCTORS  
ONLY  
L3  
L2  
L1  
T3  
T2  
CC  
L2  
COMPR.  
T1  
COMPONENT LOCATION  
LUG  
T2  
T1  
CC  
BLK L1  
BLK  
BLK  
T3  
T2  
T1  
BLK  
BLK  
CC  
YEL  
BR2  
8
BLK  
H
6
SEE NOTE 3  
BLU  
RED  
YEL OR  
M
BM  
CB* TRANS  
BLK  
7
WHT  
L
BR1  
BR2  
RED  
BRN  
(220V)  
ORG  
(240V)  
SEE NOTE 8  
PB  
SEE  
NOTE 7  
1
0
CC  
BR  
BRN YEL  
GRY  
BR  
BRN  
SEE  
NOTE 7  
TRANS  
CC  
BRG  
CCG  
C
TEST PINS  
COMPRESSOR  
RELAY  
1
2
RED  
RED  
BLU  
BRN  
GRY  
R
Y
HP  
HP  
SEE NOTE 5  
TYPICAL  
T-STAT  
3
SEE  
NOTE 4  
JW3  
FP1  
LOW TEMP  
JW2  
FP2  
LOW TEMP  
LOC  
LOC  
COMPR.  
4
Y
Y
SEE NOTE 4  
FP1  
DIP SWITCH  
5
6
PM  
1
2
3
4
5
FP1  
FP2  
RV  
W
STAGE 2  
NOT USED  
NOT USED  
1 OR 3  
GRY  
VIO  
(CAP-TUBE  
UNITS) OR  
COOLING  
(TXV UNITS)  
FP2  
O
G
R
O
G
R
7
8
VIO  
VIO  
FAN  
TRIES  
OFF ON  
24VAC  
9
BRN  
ORG  
COMMON  
ALARM  
STATUS  
LED  
RVS  
CO  
G
C
L
10  
C
JW1  
NOT USED  
YEL  
AL1  
AL2  
CO12  
P2  
CXM  
SEE NOTE 6 FOR  
DRY ALARM CONTACT  
MICROPROCESSOR  
CONTROL LOGIC  
SEE  
NOTE 6  
ALARM  
RELAY  
A
24V  
DC  
P1  
EH1  
EH2  
P3  
CO  
LEGEND  
AL  
BR  
— Alarm Relay Contacts  
— Blower Relay  
PM  
— Performance Monitor  
PSC  
RVS  
— Permanent Split Capacitor  
— Reversing Valve Solenoid  
Circuit Breaker  
Relay Contacts — N.C.  
Solenoid Coil  
CAP — Compressor Capacitor  
CB  
CC  
CO  
— Circuit Breaker  
— Compressor Contactor  
— Sensor, Condensate Overflow  
TRANS — Transformer Optional Wiring  
Field Line Voltage Wiring  
Field Low Voltage Wiring  
Printed Circuit Trace  
COMP — Compressor  
Relay Contacts — N.O.  
Switch Temperature  
Switch Low Pressure  
Ground  
FP1  
FP2  
— Sensor, Water Coil Freeze Protection  
— Sensor, Air Coil Freeze Protection  
Optional Wiring  
GND — Ground  
HP  
JW  
— High-Pressure Switch  
— Clippable Field Selection Jumper  
Relay/Contactor Coil  
LOC — Loss of Charge Pressure Switch  
Thermistor  
P1  
PB  
— Field Wiring Terminal Block  
— Power Block  
Wire Nut  
Condensate Pan  
Splice Cap  
*Optional wiring.  
NOTES:  
1. Compressor and blower motor thermally protected internally.  
2. All wiring to the unit must comply with NEC and local codes.  
3. Transformer is wired to 240 v (ORG) lead for 240/50/1 units,  
switch RED and ORG leads to PB(3) and insulate ORG lead.  
4. FP1 thermistor provides freeze protection for water. When using  
antifreeze solutions, cut JW3 jumper.  
6. 24-v alarm signal shown. For dry alarm contact, cut JW1 jumper,  
and dry contact will be available between AL1 and AL2.  
7. Transformer secondary ground via microprocessor board stand-  
offs and screws to control box. (Ground available from top two  
standoffs as shown.)  
8. Fan motors factory wired for medium speed. For high or low  
speed remove BLU wire from fan motor speed tap “M” and con-  
nect to “H” for high or “L” for low.  
5. Typical heat pump thermostat wiring shown. Refer to thermostat  
installation instructions for wiring to the unit.  
Fig. 10 — Typical Aquazone™ Complete C Control Wiring (3-Phase Unit)  
11  
SEE NOTE 8  
POWER  
DISTRIBUTION  
BLOCK  
G/Y  
G/Y  
PB  
6
START ASSIST  
WHEN NEEDED  
(
)
EARTH (GRD)  
5
4
3
2
RED*  
RED  
BLU*  
BLU  
POWER SUPPLY  
REFER TO  
DATA PLATE  
USE COPPER  
CONDUCTORS  
ONLY  
CAP  
YEL  
RED  
BLK  
BLK  
S
C
6
8
R
N (NEUTRAL)  
L
RED  
CR  
2
4
1
COMPRESSOR  
BLK  
BLK  
YEL  
2
4
8
CR  
BR1  
YEL  
SEE NOTE 3  
CB  
BR2  
BLK  
BLU  
RED  
6
TRANS  
YEL OR WHT  
BMC  
NO COM  
NC  
BLK  
RED  
BR1  
24V  
BLU  
(
(
)
)
220V  
BRN  
BR2  
YEL  
ORG  
240V  
BRN  
BRN  
SIZES: 006, 009, 012  
RED  
RED  
SEE  
NOTE 7  
SEE  
NOTE 7  
0
BR1  
1
C
R
FAN ENABLE  
TYPICAL HEAT  
PUMP T-STAT  
SEE NOTE 5  
RC S  
COM2 COM1  
S
C
RELAY  
COM  
NO  
P1  
Y1  
Y2  
W1  
O/W2 4  
G
R
GRY  
1
2
3
COMPR.  
FAN  
SPEED  
RELAY  
COM  
NO  
COOLING  
BR2  
O
G
FAN  
24VAC  
COMMON  
ALARM  
DXM  
5
6
7
8
NC  
1
HWTS  
BLK*  
MICROPROCESSOR  
CONTROL LOGIC  
BLK*  
GRY  
R
C
XI  
HP  
C
AL1  
RED  
HP  
SEE  
NOTE 6  
2
RED  
BLU  
LOC  
SEE NOTE 4  
FP1 (TXV UNITS)  
3
ALARM  
RELAY  
P2  
AL2  
R
NSB  
C
ESD  
OVR  
H
LOC  
FP1  
FP2  
4
JW4  
DRY  
SEE NOTE 6 FOR  
DRY CONTACT  
FOR ALARM  
STATUS  
G
R
GRY  
GRY  
VIO  
5
6
7
8
AL2  
Y
TEST  
FAULT  
VIO  
VIO  
(CAP TUBE  
UNITS) OR  
FP2  
RV RELAY  
9
10  
BRN  
ORG  
RV  
COMPONENT LOCATION  
TEST  
PINS  
CO  
YEL  
CO 12  
P7  
A
P3  
JW3  
SEE  
LOW  
24V  
DC  
CR  
BR2  
BR1  
FP1  
JW2  
FP2  
JW1  
LP  
NOTE 4  
R
LOW  
N.O.  
EH1  
NO1  
NC1  
COM  
NO2  
NC2  
COM  
ACC1  
RELAY  
EH2  
P6  
BRN*  
OFFON  
OFFON  
PM: DISABLE/ENABLE  
CCG  
1
2
1
2
3
1
2
3
4
5
6
7
8
ACC1  
FUNCTIONS  
UNIT STAGE: 2/1  
CR  
BRN  
YEL  
ACC2  
RELAY  
T’STAT: HEAT COOL/HEAT PUMP  
COMPR  
RELAY  
MV*  
4 RV ON B/RV ON 0  
ACC2  
FUNCTIONS  
5
6
7
8
DEHUMID/NORMAL  
NOT USED  
CC  
R
H: HI FAN/DEHUMID  
NOT USED  
RED*  
BOILERLESS: ENABLE/DISABLE  
BOILERLESS: 40°F/50°F  
S1  
DIP SWITCH PACKAGE  
S2  
DIP SWITCH PACKAGE  
SIZES: 015-060  
LEGEND  
AL  
— Alarm Relay Contacts  
— Blower Motor  
P1  
— Field Wiring Terminal Block  
— Power Block  
Thermistor  
BM  
PB  
BMC — Blower Motor Capacitor  
PM  
PSC  
RVS  
— Performance Monitor  
— Permanent Split Capacitor  
— Reversing Valve Solenoid  
Condensate Pan  
LED  
BR  
— Blower Relay  
G
CAP — Compressor Capacitor  
CB  
— Circuit Breaker  
TRANS — Transformer Optional Wiring  
Field Line Voltage Wiring  
Field Low Voltage Wiring  
Printed Circuit Trace  
Solenoid Coil  
CO  
— Sensor, Condensate Overflow  
FP1  
FP2  
— Sensor, Water Coil Freeze Protection  
— Sensor, Air Coil Freeze Protection  
Relay Contacts — N.O.  
Temperature Switch  
Switch — Loss of Charge  
Ground  
GND — Ground  
HP  
— High-Pressure Switch  
Optional Wiring  
HWTS — High (Leaving) Water Temp Switch  
JW  
— Clippable Field Selection Jumper  
Relay/Contactor Coil  
LOC — Loss of Charge Pressure Switch  
MV — Motorized Valve  
Wire Nut  
*Optional wiring.  
NOTES:  
1. Compressor thermally protected internally.  
2. All wiring to the unit must comply with NEC and local codes.  
3. Transformer is wired to 240 v (ORG) lead for 240/50/1 units,  
switch RED and ORG leads to PB(1) and insulate ORG lead for  
220/50/1.  
6. 24-v alarm signal shown. For dry alarm contact, cut JW4 jumper,  
and dry contact will be available between AL1 and AL2.  
7. Transformer secondary ground via microprocessor board stand-  
offs and screws to control box. (Ground available from top two  
standoffs as shown.)  
8. Blower motor is factory wired for medium and high speeds. For  
any other combination of speeds, at the motor attach black wire  
to the higher of the two desired speed taps, and the blue wire to  
the lower of the two desired speed taps.  
4. FP1 thermistor provides freeze protection for water. When using  
antifreeze solutions, cut JW3 jumper.  
5. Check installation wiring information for specific thermostat  
hookup. Refer to thermostat installation instructions for wiring to  
the unit. Thermostat wiring must be “Class 1” and voltage rating  
equal to or greater than unit supply voltage.  
Fig. 11 — Typical Aquazone™ Deluxe D Control Wiring (Single-Phase Unit)  
12  
PB  
6
G/Y  
COMPONENT LOCATION  
LUG  
G/Y  
G/Y  
5
4
3
2
1
EARTH (GND)  
N (NEUTRAL)  
GROUND  
LUG  
T3  
T2  
T1  
POWER SUPPLY  
REFER TO  
DATA PLATE  
USE COPPER  
CONDUCTORS  
ONLY  
CC  
L3  
T3  
BLK  
BLK  
BLK  
BLK  
BLK  
BLK  
BLK  
BLK  
L3  
L2  
L1  
T3  
T2  
CC  
L2  
COMPR.  
T2  
T1  
T1  
CC  
L1  
BR1  
BLK  
BLK  
BR2  
PB  
BR1  
BR2  
YEL  
YEL  
BLK  
H
8
6
8
6
7
BLU  
RED  
YEL OR  
WHT  
M
BM  
CB  
YEL  
YEL  
24V  
BMC  
L
BRN  
RED  
(220V)  
TRANS  
BLU  
SEE NOTE 8  
ORG  
(240V)  
BRN  
BRN  
RED  
RED  
SEE  
NOTE 7  
SEE  
NOTE 7  
0
BR1  
1
C
FAN ENABLE  
RELAY  
COM  
TYPICAL HEAT  
PUMP T-STAT  
SEE NOTE 5  
R C S  
COM2 COM1  
S
C
P1  
Y1  
R
GRY  
COMPR.  
NO  
Y
1
2
3
Y2  
FAN  
SPEED  
COM  
W1  
COOLING  
FAN  
RELAY  
BR2  
O
G
O/W2 4  
DXM  
G
R
5
6
7
8
NO  
NC  
24VAC  
MICROPROCESSOR  
CONTROL LOGIC  
HWTS  
BLK*  
GRY  
R
C
XI  
BLK*  
HP  
COMMON  
ALARM  
C
RED  
RED  
BLU  
BRN  
GRY  
GRY  
1
HP  
SEE  
NOTE 6  
2
3
4
5
AL1  
ALARM  
RELAY  
LOC  
LOC  
P2  
SEE NOTE 6 FOR  
DRY CONTACT  
FOR ALARM  
JW4  
DRY  
SEE NOTE 4  
FP1  
AL2  
R
G
TEST  
STATUS  
AL2  
FP1  
FP2  
RV  
TXV  
UNITS  
Y
6
7
8
9
VIO  
VIO  
VIO  
VIO  
CAP TUBE  
UNIT  
NSB  
C
FAULT  
RV  
R
FP2  
BRN  
ORG  
RELAY  
ESD  
OVR  
H
10  
TEST  
PINS  
CO  
YEL  
CO12  
P7  
A
P3  
JW3  
FP1  
SEE  
NOTE 4  
LOW  
LOW  
N.O.  
24V  
DC  
R
JW2  
FP2  
JW1  
LP  
EH1  
NO1  
NC1  
COM  
NO2  
NC2  
COM  
R
ACC1  
EH2  
P6  
RELAY  
OFFON  
OFFON  
CCG  
PM: DISABLE/ENABLE  
CC  
1
2
3
1
2
3
4
5
6
7
8
BRN  
YEL  
ACC1  
UNIT STAGE: 2/1  
A2  
A1  
COMPR  
RELAY  
CC  
ACC2  
FUNCTIONS  
T’STAT: HEAT COOL/HEAT PUMP  
RELAY  
4 RV ON B/RV ON 0  
ACC2  
FUNCTIONS  
5
6
7
8
DEHUMID/NORMAL  
NOT USED  
H: HI FAN/DEHUMID  
NOT USED  
BOILERLESS: ENABLE/DISABLE  
BOILERLESS: 40°F/50°F  
S1  
DIP SWITCH PACKAGE  
S2  
DIP SWITCH PACKAGE  
LEGEND  
AL  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Alarm Relay Contacts  
Blower Motor  
PM  
—
—
—
—
Performance Monitor  
Circuit Breaker  
LED  
BM  
PSC  
RVS  
Permanent Split Capacitor  
Reversing Valve Solenoid  
Transformer Optional Wiring  
BMC  
BR  
Blower Motor Capacitor  
Blower Relay  
G
TRANS  
CAP  
CB  
Compressor Capacitor  
Circuit Breaker  
Sensor, Condensate Overflow  
Field Line Voltage Wiring  
Field Low Voltage Wiring  
Printed Circuit Trace  
Optional Wiring  
Capacitor  
CO  
Solenoid Coil  
Relay Contacts — N.O.  
Temperature Switch  
Switch — Loss of Charge  
Ground  
FP1  
FP2  
GND  
HP  
Sensor, Water Coil Freeze Protection  
Sensor, Air Coil Freeze Protection  
Ground  
High-Pressure Switch  
Relay/Contactor Coil  
HWTS  
JW  
High (Leaving) Water Temp Switch  
Clippable Field Selection Jumper  
Loss of Charge Pressure Switch  
Motorized Valve  
LOC  
MV  
Thermistor  
P1  
Field Wiring Terminal Block  
Power Block  
Condensate Pan  
Wire Nut  
PB  
*Optional wiring.  
NOTES:  
1. Compressor thermally protected internally.  
2. All wiring to the unit must comply with NEC and local codes.  
3. Neutral of 380/415-3-50 is required. Transformer is wired to 240-v (ORG)  
lead for 415/3/50. For 380/3/50 switch ORG and (RED) leads at PB(3) and  
insulate ORG lead. Transformer uses separate circuit breaker.  
4. FP1 thermistor provides freeze protection for water. When using antifreeze  
solutions, cut JW3 jumper.  
5. Check installation wiring information for specific thermostat hookup. Refer  
to thermostat installation instructions for wiring to the unit. Thermostat  
wiring must be “Class 1” and voltage rating equal to or greater than unit  
supply voltage.  
6. 24-v alarm signal shown. For dry alarm contact, cut JW4 jumper, and dry  
contact will be available between AL1 and AL2.  
7. Transformer secondary ground via microprocessor board standoffs and  
screws to control box. (Ground available from top two standoffs as shown.)  
8. Blower motor is factory wired for medium and high speeds. For any other  
combination of speeds, at the motor attach black wire to the higher of the  
two desired speed taps, and the blue wire to the lower of the two desired  
speed taps.  
9. Blower motor is factory wired for high and low speeds. No other combina-  
tion of speeds is available.  
Fig. 12 — Typical Aquazone™ Deluxe D Control Wiring (3-Phase Unit)  
13  
Table 3 — Electrical Data  
COMPRESSOR  
FAN  
MOTOR  
FLA  
TOTAL  
UNIT  
FLA  
MIN  
CIRCUIT  
AMP  
50RHE  
UNIT  
VOLTS-PHASE  
(50 Hz)  
VOLTAGE  
MIN/MAX  
MAX  
FUSE/HACR  
RLA  
LRA  
006  
009  
012  
015  
019  
024  
220/240-1  
220/240-1  
220/240-1  
220/240-1  
220/240-1  
220/240-1  
220/240-1  
380-415-3  
220/240-1  
380-415-3  
380-415-3  
380-415-3  
380-415-3  
197/254  
197/254  
197/254  
197/254  
197/254  
197/254  
197/254  
342/462  
197/254  
342/462  
342/462  
342/462  
342/462  
2.3  
2.7  
3.9  
4.2  
6.8  
8.2  
9.1  
3.3  
11.5  
4.2  
5.5  
5.9  
8.2  
15.0  
18.8  
22.2  
27.0  
45.0  
51.0  
54.0  
25.0  
83.0  
32.0  
34.5  
42.0  
61.8  
0.4  
0.7  
0.7  
0.9  
0.9  
1.6  
1.7  
1.0  
2.7  
1.7  
1.7  
1.8  
2.5  
2.7  
3.7  
3.2  
4.5  
15  
15  
15  
15  
15  
20  
20  
15  
35  
15  
15  
15  
15  
4.5  
5.6  
5.9  
7.1  
8.6  
10.5  
12.6  
13.6  
5.2  
10.4  
11.2  
4.3  
030  
036  
17.2  
5.9  
20.8  
6.9  
042  
048  
060  
6.0  
7.1  
7.5  
8.9  
9.9  
11.8  
LEGEND  
FLA  
— Full Load Amps  
HACR — Heating, Air Conditioning and Refrigeration  
LRA — Locked Rotor Amps  
RLA — Rated Load Amps  
POWER CONNECTION — Make line voltage connection  
by connecting the incoming line voltage wires to the L side  
of the CC terminal as shown in Fig. 13. See Table 3 for  
correct wire and maximum overcurrent protection sizing.  
SUPPLY VOLTAGE — Operating voltage to unit must be  
within voltage range indicated on unit nameplate.  
On 3-phase units, voltages under load between phases must  
be balanced within 2%. Use the following formula to deter-  
mine the percentage voltage imbalance:  
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.  
220-VOLT OPERATION — All 220-240 volt units are factory  
wired for 208 volts. The transformers may be switched to  
220-volt operation by switching the red (220 volt) wire with  
the orange (240 volt) wire at the TB1-1 terminal for single-  
phase and TB1-3 for 3-phase.  
% Voltage Imbalance  
max voltage deviation from average voltage  
= 100 x  
average voltage  
Example: Supply voltage is 460-3-60.  
AB = 452 volts  
BC = 464 volts  
AC = 455 volts  
452 + 464 + 455  
Average Voltage =  
3
1371  
=
3
=
457  
Determine maximum deviation from average voltage:  
(AB) 457 – 452 = 5 v  
(BC) 464 – 457 = 7 v  
(AC) 457 – 455 = 2 v  
Maximum deviation is 7 v.  
Determine percent voltage imbalance.  
7
% Voltage Imbalance = 100 x  
457  
= 1.53%  
This amount of phase imbalance is satisfactory as it is  
below the maximum allowable 2%.  
Fig. 13 — 50RHE Typical Single-Phase Line  
Voltage Power Connection  
14  
PSC (PERMANENT SPLIT CAPACITOR) BLOWER SPEED  
SELECTION — All Water Source Heat Pumps are factory set  
to deliver rated airflow at nominal static (37 Pa) on medium  
speed. Where higher static is needed, high speed can be  
utilized (100 to 125 Pa). Low speed will deliver approximately  
85% of rated airflow (25 Pa). The PSC blower fan speed can  
be changed on all units by swapping wires connected to the  
relay contacts that control the fan. See Table 4 and Fig. 14.  
CONNECT THE BLUE WIRE TO:  
H FOR HIGH SPEED FAN  
M FOR MEDIUM SPEED FAN  
L FOR LOW SPEED FAN  
BLU  
MEDIUM FACTORY SETTING  
L
H
M
NOTE: Available airflow for all units is shown in Table 4.  
FAN MOTOR  
Fig. 14 — 50RHE Blower Speed Selection  
Table 4 — 50RHE Blower Performance  
AIRFLOW (L/s)  
External Static Pressure (Pa)  
NOMINAL  
AIRFLOW  
(L/s)  
MINIMUM  
AIRFLOW  
(L/s)  
50RHE  
UNIT  
FAN  
SPEED  
0
25  
50  
75  
100  
125  
HI  
MED  
LO  
HI  
MED  
LO  
HI  
MED  
LO  
HI  
MED  
LO  
HI  
MED  
LO  
HI  
MED  
LO  
HI  
MED  
LO  
HI  
MED  
LO  
133  
110  
98  
165  
160  
151  
170  
165  
146  
345  
321  
293  
326  
302  
293  
396  
387  
368  
529  
510  
458  
614  
580  
505  
123  
99  
112  
87  
89  
78  
—
—
—
—
—
—
—
109  
—
—
—
—
—
—
—
—
—
—
—
330  
326  
297  
373  
349  
—
435  
—
—
464  
455  
446  
81  
113  
140  
212  
264  
307  
349  
437  
530  
630  
61  
85  
006  
009  
012  
015  
019  
024  
030  
036  
042  
048  
68  
60  
90  
75  
—
151  
146  
137  
165  
151  
137  
316  
302  
278  
311  
288  
269  
368  
359  
340  
496  
477  
439  
576  
543  
472  
691  
593  
463  
142  
127  
123  
151  
142  
127  
288  
274  
255  
283  
260  
245  
335  
326  
311  
463  
448  
406  
519  
488  
429  
629  
539  
421  
118  
113  
109  
137  
127  
118  
250  
241  
222  
250  
227  
217  
302  
297  
278  
425  
415  
378  
463  
434  
387  
566  
485  
—
99  
94  
90  
123  
118  
104  
198  
189  
179  
203  
189  
179  
260  
255  
231  
378  
368  
340  
415  
392  
349  
501  
429  
—
104  
160  
198  
231  
264  
326  
396  
472  
HI  
MED  
LO  
HI  
MED  
LO  
743  
637  
498  
793  
777  
762  
738  
723  
709  
672  
658  
645  
604  
592  
580  
535  
524  
514  
HI  
MED  
LO  
HI  
MED  
LO  
—
—
—
896  
818  
748  
—
—
—
757  
710  
690  
796  
747  
683  
668  
623  
612  
755  
707  
653  
552  
529  
516  
710  
658  
618  
High Static  
048  
630  
472  
595  
787  
748  
797  
866  
803  
731  
833  
779  
709  
790  
060  
LEGEND  
NOTES:  
1. Units factory shipped on medium speed. Other speeds require  
field selection.  
Shaded areas are below minimum CFM. This data is  
provided for troubleshooting information only.  
2. For dual voltage units, airflow is rated at lowest voltage.  
3. Performance data shown is based n wet coil and clean air filter.  
15  
Step 9 — Low Voltage Wiring (See Fig. 15)  
BR BRG CCG CC  
THERMOSTAT CONNECTIONS — The thermostat should  
be wired directly to the Aquazone™ control board. See  
Fig. 9-12.  
Comp  
Relay  
CLIP JW2-FP2  
JUMPER FOR  
ANTI-FREEZE  
SYSTEMS  
Off On  
C
R
Y
Test  
P2  
HP  
HP  
LP  
LP  
FP1  
FP1  
FP2  
FP2  
RV  
1
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 –10.6 C when using  
antifreeze in colder earth loop applications. See Fig. 16.  
FP1 Low Temp  
FP2 Low Temp  
JW3  
JW2  
CLIP JW3  
FOR  
FREEZE  
PROTECT  
Y
W
O
Micro  
RV  
CO  
CO  
12  
G
AIR COIL FREEZE PROTECTION — The air coil freeze  
protection jumper JW2 (FP2) is factory set for –1.1 C and  
should not need adjusting.  
R
C
AL1  
AL2  
A
Status  
LED  
P3  
24Vdc  
JW1-AL2 DRY  
1
4
EH1  
EH2  
ACCESSORY CONNECTIONS — Terminal A on the control  
is provided to control accessory devices such as water valves,  
electronic air cleaners, humidifiers, etc. This signal operates  
with the compressor terminal. See Fig. 17. Refer to the specific  
unit wiring schematic for details.  
P1  
Alarm  
Relay  
CO  
CLIP  
FOR DRY  
CONTACT  
NOTE: The A terminal should only be used with 24-volt  
signals — not line voltage signals.  
AQUAZONE CONTROL (C Control Shown)  
Fig. 16 — Typical Aquazone Control Board  
Jumper Locations  
WATER SOLENOID VALVES — Water solenoid valves may  
be used on primary/secondary pump and ground water installa-  
tions. A typical well water control valve wiring approach,  
which can limit waste water in a lockout condition, is shown in  
Fig. 17. A slow closing valve may be required to prevent water  
hammer. When using a slow closing valve, consider special  
wiring conditions. The valve takes approximately 60 seconds  
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:  
Terminal Strip P2  
C
Typical  
Water  
Valve  
24 VAC  
A
1. Remain open during a lockout  
2. Draw approximately 25 to 35 VA through the “Y” signal  
of the thermostat.  
Fig. 17 — Typical D Control Accessory Wiring  
IMPORTANT: Connecting a water solenoid valve can  
overheat the anticipators of electromechanical thermo-  
stats. 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. Condensate line is open and correctly pitched.  
10. Transformer switched to lower voltage tap if necessary.  
11. Blower rotates freely — shipping support is removed.  
12. Blower speed is on correct setting.  
13. Air filter is clean and in position.  
14. Service/access panels are in place.  
15. Return air temperature is between 4.4 to 26.7 C heating  
and 10 to 43.3 C cooling.  
16. Air coil is clean.  
17. Control field selected settings are correct.  
NOTE: Low voltage connector may be removed for easy installation.  
Fig. 15 — Low Voltage Field Wiring  
16  
AIR COIL — To obtain maximum performance, clean the air  
coil before starting the unit. A ten percent solution of dish-  
washing detergent and water is recommended for both sides of  
the coil. Rinse thoroughly with water.  
D Control DIP Switches — The 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. 11 and 12.  
DIP SWITCH BLOCK 1 (S1) — This set of switches offers  
the following options for D Control configuration:  
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  
(units with 2 compressors and 2 D controls) or in master/slave  
applications. In master/slave applications, each compressor 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 ener-  
gizing 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.  
IMPORTANT: Jumpers and DIP switches should only  
be clipped when power to control board has been turned  
off.  
C Control Jumper Settings (See Fig. 9 and 10)  
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.  
AIR COIL FREEZE PROTECTION (FP2) LIMIT SET-  
TING — Select jumper 2 (JW2-FP2 Low Temp) to choose  
FP2 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.  
NOTE: If DIP switch is set for stage 2, the alarm relay will not  
cycle during Test mode.  
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.  
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.  
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.  
C Control DIP Switches — The C Control has 1 DIP  
switch block with five switches. See Fig. 9 and 10.  
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.  
Dehumidification Fan Mode — Switch 5 provides selection  
of normal or dehumidification fan mode. Select OFF for dehu-  
midification mode. The fan speed relay will remain OFF dur-  
ing cooling stage 2. Select ON for normal mode. The fan speed  
relay will turn on during cooling stage 2 in normal mode.  
Switch 6 — Not used.  
SWITCHES 3 AND 4 — Not used.  
Boilerless Operation — Switch 7 provides selection of boiler-  
less operation and works in conjunction with switch 8. In  
boilerless operation mode, only the compressor is used for  
heating when FP1 is above the boilerless changeover tempera-  
ture set by switch 8 below. Select ON for normal operation or  
select OFF for boilerless operation.  
Boilerless Changeover Temperature — Switch 8 on S1 pro-  
vides selection of boilerless changeover temperature set point.  
Select OFF for set point of 10 C or select ON for set point  
of 4.4 C.  
If switch 8 is set for 10 C, then the compressor will be used  
for heating as long as the FP1 is above 10 C. The compressor  
will not be used for heating when the FP1 is below 10 C and  
the compressor will operates in emergency heat mode, staging  
on EH1 and EH2 to provide heat. If a thermal switch is being  
used instead of the FP1 thermistor, only the compressor will be  
used for heating mode when the FP1 terminals are closed. If  
the FP1 terminals are open, the compressor is not used and the  
control goes into emergency heat mode.  
DIP SWITCH BLOCK 2 (S2) — This set of DIP switches is  
used to configure accessory relay options. See Fig. 11 and 12.  
Switches 1 to 3 — These DIP switches provide selection  
of Accessory 1 relay options. See Table 5 for DIP switch  
combinations.  
Switches 4 to 6 — These DIP switches provide selection  
of Accessory 2 relay options. See Table 6 for DIP switch  
combinations.  
1 OR 3 TRIES — DIP switch 5 provides selection of whether  
there are 1 or 3 tries for FP1 and FP2. This only applies to FP1  
and FP2, and not to any other faults. Set DIP switch 5 to ON  
for 1 try or to OFF for 3 tries.  
NOTE: The alarm relay will not cycle during Test mode if  
switch is set to OFF, stage 2.  
D Control Jumper Settings (See Fig. 11 and 12)  
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.  
AIR COIL FREEZE PROTECTION (FP2) LIMIT SET-  
TING — Select jumper 2 (JW2-FP2 Low Temp) to choose  
FP2 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 D Control can be con-  
figured for Low Pressure Setting (LP). Select jumper 1  
(JW1-LP Norm Open) for choosing between low pressure  
input normally opened or closed. To configure for normally  
closed operation, do not clip the jumper. To configure for  
normally open operation, clip the jumper.  
17  
Table 5 — DIP Switch Block S2 —  
Accessory 1 Relay Options  
DIP SWITCH POSITION  
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.  
ACCESSORY 1  
RELAY OPTIONS  
1
2
3
Cycle with Fan  
Digital NSB  
Water Valve — Slow Opening  
OAD  
On  
Off  
On  
On  
On  
On  
Off  
On  
On  
On  
On  
Off  
START-UP  
LEGEND  
Use the procedure outlined below to initiate proper unit  
start-up.  
NSB — Night Setback  
OAD — Outdoor-Air Damper  
NOTE: This equipment is designed for indoor installation only.  
NOTE: All other DIP switch combinations are invalid.  
Operating Limits  
Table 6 — DIP Switch Block S2 —  
Accessory 2 Relay Options  
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.  
DIP SWITCH POSITION  
ACCESSORY 2  
RELAY OPTIONS  
4
5
6
POWER SUPPLY — A voltage variation of 10% of name-  
plate utilization voltage is acceptable.  
UNIT STARTING CONDITIONS — Depending on the mod-  
el, units start and operate in an ambient temperature of 7.2 C  
with entering air temperature at 4.4 C or 10 C, entering water  
temperature at –6.7 C or 10 C and with both air and water at the  
flow rates used.  
Cycle with Fan  
Digital NSB  
Water Valve — Slow Opening  
OAD  
On  
Off  
On  
On  
On  
On  
Off  
On  
On  
On  
On  
Off  
LEGEND  
NSB — Night Setback  
OAD — Outdoor-Air Damper  
NOTE: These operating limits are not normal or continuous  
operating conditions. Assume that such a start-up is for the  
purpose of bringing the building space up to occupancy tem-  
perature. See Table 7 for operating limits.  
NOTE: All other switch combinations are invalid.  
Auto Dehumidification Mode or High Fan Mode — Switch 7  
provides selection of auto dehumidification fan mode or high  
fan mode. In auto dehumidification fan mode the fan speed  
relay will remain off during cooling stage 2 if terminal H is  
active. In high fan mode, the fan enable and fan speed relays  
will turn on when terminal H is active. Set the switch to ON for  
auto dehumidification fan mode or to OFF for high fan mode.  
When the disconnect switch is closed, high voltage is  
present in some areas of the electrical panel. Exercise  
caution when working with the energized equipment.  
Switch 8 — Not used.  
1. Restore power to system.  
2. Turn thermostat fan position to ON. Blower should start.  
3. Balance airflow at registers.  
4. Adjust all valves to the full open position and turn on the  
line power to all heat pump units.  
5. Operate unit in the cooling cycle. Refer to Table 7 for unit  
operating limits.  
NOTE: Three factors determine the operating limits of a unit:  
(1) entering air temperature, (2) water temperature and (3)  
ambient temperature. Whenever any of these factors are at a  
minimum or maximum level, the other two factors must be at a  
normal level to ensure proper unit operation. See Table 7.  
D Control Accessory Relay Configurations —  
The following accessory relay settings are applicable for both  
D controls only:  
CYCLE WITH FAN — In this configuration, the relay will be  
ON any time the Fan Enable relay is on.  
CYCLE WITH COMPRESSOR — In this configuration, the  
relay will be ON any time the Compressor relay is on.  
DIGITAL NIGHT SET BACK (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.  
Table 7 — Operating Limits — 50RHE Units  
MECHANICAL NIGHT SET BACK — When NSB input is  
connected to ground C, all thermostat inputs are ignored. A  
thermostat set back heating call will then be connected to the  
OVR input. If OVR input becomes active, then the D control  
will enter Night Low Limit (NLL) staged heating mode. The  
NLL staged heating mode will then provide heating during the  
NSB period.  
AIR LIMITS  
Min. Ambient Air  
COOLING (C) HEATING (C)  
7.2  
26.7  
37.8  
7.2  
21.1  
29.4  
4.4  
Rated Ambient Air  
Max. Ambient Air  
Min. Entering Air  
Rated Entering Air db/wb  
Max. Entering Air db/wb  
WATER LIMITS  
Min. Entering Water  
Normal Entering Water  
LEGEND  
10  
27/19  
43.3/28.3  
20/15  
27  
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.  
–1.1  
–6.7  
10 to 32  
–1.1 to 15.6  
Outdoor-Air Damper (OAD) — If relay is configured  
for OAD, the relay will normally be ON any time the Fan  
Enable relay is energized. The relay will not start for 30 min-  
utes following a return to normal mode from NSB, when NSB  
is no longer connected to ground C. After 30 minutes, the relay  
will start if the Fan Enable is set to ON.  
db — Dry Bulb  
wb — Wet Bulb  
NOTE: Value in heating column is dry bulb only. Any wet bulb read-  
ing is acceptable.  
18  
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 correct.  
Unit Start-Up Heating Mode  
NOTE: Operate the unit in heating cycle after checking the  
cooling cycle. Allow five minutes between tests for the pres-  
sure or reversing valve to equalize.  
1. Turn thermostat to lowest setting and set thermostat  
switch to HEAT position.  
2. Slowly turn the thermostat to a higher temperature until  
the compressor activates.  
3. Check for warm air delivery at the unit grille within a few  
minutes after the unit has begun to operate.  
4. Check the temperature of both supply and discharge  
water. Compare to Table 9. If temperature is within range,  
proceed. If temperature is outside the range, check the  
heating refrigerant pressures in Table 9.  
5. Once the unit has begun to run, check for warm air deliv-  
ery at the unit grille.  
The suction and discharge pressure levels should now move  
to their normal start-up levels.  
6. Check air temperature rise across the coil when compres-  
sor is operating. Air temperature rise should be between  
11.1 and 16.7 C after 15 minutes at load.  
When the compressor is rotating in the wrong direction, the  
unit makes more noise and does not provide cooling.  
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.  
7. Check for vibration, noise and water leaks.  
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. See Table 10. Adjust the water control valve until the  
flow of .027 to .054 L/s per kW cooling is achieved. Since the  
pressure constantly varies, two pressure gages may be needed  
in some applications.  
An alternative method is to install a flow control device.  
These devices are typically an orifice of plastic material  
designed 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 well water setup.  
NOTE: There is a 5-minute time delay before the compressor  
will start.  
Unit Start-Up Cooling Mode  
1. Adjust the unit thermostat to the warmest position.  
Slowly reduce the thermostat position until the compres-  
sor activates.  
2. Check for cool air delivery at unit grille a few minutes  
after the unit has begun to operate.  
3. Verify that the compressor is on and that the water flow  
rate is correct by measuring pressure drop through the  
heat exchanger using P/T plugs. See Table 8. Check the  
elevation and cleanliness of the condensate lines; any  
dripping could be a sign of a blocked line. Be sure the  
condensate trap includes a water seal.  
4. Check the temperature of both supply and discharge wa-  
ter. Compare to Table 9. If temperature is within range,  
proceed. If temperature is outside the range, check the  
cooling refrigerant pressures in Table 9.  
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.  
5. Check air temperature drop across the coil when com-  
pressor is operating. Air temperature drop should be  
between 8.3 and 13.9.  
Table 8 — Water Temperature Change  
Through Heat Exchanger  
COOLING  
RISE (C)  
HEATING  
DROP (C)  
WATER FLOW RATE (l/s)  
Min Max Min Max  
For Closed Loop: Ground  
Source or Cooling/Boiler  
Systems at 0.054 l/s per kW  
For Open Loop: Ground  
Water Systems 0.027 l/s per kW  
5
6.7 2.2  
4.4  
9.4  
11.1 14.4 5.6  
19  
Table 9 — Typical Unit Operating Pressures and Temperatures  
COOLING  
HEATING  
ENTERING  
WATER  
TEMP (C)  
(EWT)  
WATER  
FLOW  
(l/s per kW)  
Suction Discharge Super-  
Sub-  
Water Temp Air Temp Suction Discharge Super- Sub-  
Air  
Water Temp  
Drop (C) DB  
Pressure Pressure  
heat cooling  
Rise  
(C)  
Drop (C) Pressure Pressure  
heat cooling  
Temp  
(kPa)  
(kPa)  
(C)  
(C)  
DB  
(kPa)  
(kPa)  
(C)  
(C)  
Rise (C)  
0.027  
0.041  
0.054  
225-254  
222-251  
219-248  
269-314  
239-284  
209-254  
14-22  
14-22  
14-22  
7-11  
6-10  
6- 9  
12-13  
7- 9  
3- 6  
12-14  
12-14  
12-14  
102-117  
111-129  
120-138  
499-556  
514-571  
529-586  
7- 9  
7- 9  
7- 9  
1-2  
1-2  
1-2  
4-5  
3-4  
2-3  
8-11  
9-12  
9-12  
–1  
10  
21  
32  
43  
0.027  
0.041  
0.054  
225-254  
222-251  
219-248  
374-463  
359-425  
344-413  
7-11  
7-11  
7-11  
6-10  
5- 9  
4- 8  
11-13  
7- 8  
4- 7  
11-14  
11-14  
11-14  
150-179  
158-185  
164-194  
538-628  
553-643  
568-658  
6- 9  
6- 9  
6- 9  
1-3  
1-3  
1-3  
6-7  
4-5  
3-4  
13-16  
13-17  
14-17  
0.027  
0.041  
0.054  
225-254  
222-251  
219-248  
535-592  
502-556  
472-523  
5- 9  
5- 9  
5- 9  
4- 8  
4- 7  
4- 7  
11-12  
7- 9  
4- 7  
11-13  
11-13  
11-13  
212-245  
218-254  
227-263  
613-688  
628-712  
643-724  
8-11  
8-11  
8-11  
1-3  
1-3  
1-3  
8-9  
5-6  
3-4  
16-19  
17-21  
17-21  
0.027  
0.041  
0.054  
225-254  
222-251  
219-248  
685-750  
652-721  
622-688  
5- 9  
5- 9  
5- 9  
4- 8  
4- 7  
4- 7  
10-12  
6- 8  
3- 6  
9-13  
9-13  
9-13  
254-284  
269-299  
284-314  
658-777  
673-792  
688-807  
10-16  
10-16  
10-16  
1-3  
1-3  
1-3  
8-9  
6-7  
4-5  
18-22  
18-23  
19-23  
0.027  
0.041  
0.054  
231-260  
228-257  
225-254  
837-957  
807-927  
777-897  
4- 8  
4- 8  
4- 8  
6-14  
6-13  
6-12  
9-11  
5- 7  
3- 6  
8-11  
8-11  
8-11  
LEGEND  
Dry Bulb  
Entering Air Temperature  
NOTES:  
1. Based on nominal 54 L/s per kW airflow and 21° C EAT heating and 26.7/  
194° C EAT cooling.  
DB  
EAT  
—
—
2. Cooling air and water numbers can vary greatly with changes in humidity.  
3. Subcooling is based upon the head pressure at compressor service port.  
Table 10 — 50RHE Coaxial Water Pressure Drop  
3. Maintain a fluid level in the tank above the return tee to  
avoid air entering back into the fluid.  
4. Shutting off the return valve that connects into the flush  
cart reservoir will allow 345 kPa surges to help purge air  
pockets. This maintains the pump at 345 kPa.  
5. To purge, keep the pump at 345 kPa until maximum  
pumping pressure is reached.  
6. Open the return valve to send a pressure surge through  
the loop to purge any air pockets in the piping system.  
7. A noticeable drop in fluid level will be seen in the flush  
cart tank. This is the only indication of air in the loop.  
NOTE: If air is purged from the system while using a 254 mm  
PVC flush tank, the level drop will only be 25 to 51 mm since  
liquids are incompressible. If the level drops more than this,  
flushing should continue since air is still being compressed in  
the loop. If level is less than 25 to 51 mm, reverse the flow.  
8. Repeat this procedure until all air is purged.  
9. Restore power.  
Antifreeze may be added before, during or after the flushing  
process. However, depending on when it is added in the  
process, it can be wasted. Refer to the Antifreeze section for  
more detail.  
PRESSURE DROP (kPa)  
UNIT  
50RHE  
L/S  
0° C  
10° C  
20° C  
30° C  
0.047  
0.071  
0.095  
6.0  
8.4  
5.4  
7.8  
5.1  
7.2  
4.8  
6.9  
006  
009  
012  
015  
019  
024  
030  
036  
042  
048  
060  
14.1  
13.2  
12.0  
11.7  
0.071  
0.107  
0.139  
8.1  
12.0  
23.9  
7.5  
11.1  
22.4  
6.9  
10.5  
20.9  
6.6  
9.9  
20.0  
0.095  
0.145  
0.189  
19.1  
41.3  
66.1  
17.9  
38.9  
61.9  
16.7  
36.2  
57.7  
16.1  
34.7  
55.0  
0.114  
0.164  
0.221  
16.7  
32.6  
55.9  
15.5  
30.5  
52.3  
14.7  
28.7  
48.7  
14.1  
27.2  
46.3  
0.142  
0.215  
0.284  
12.9  
23.0  
45.4  
12.0  
21.5  
42.5  
11.1  
20.3  
39.8  
10.8  
19.1  
37.7  
0.189  
0.284  
0.379  
13.8  
28.7  
47.8  
12.6  
26.9  
44.9  
11.7  
25.1  
41.9  
11.4  
23.9  
39.8  
0.237  
0.347  
0.473  
9.9  
17.0  
26.9  
9.0  
15.8  
25.4  
8.4  
14.7  
23.6  
8.1  
14.1  
22.4  
0.284  
0.426  
0.568  
7.8  
15.0  
23.9  
7.2  
13.8  
22.4  
6.9  
12.9  
20.9  
6.6  
12.3  
20.0  
0.331  
0.498  
0.663  
9.9  
19.7  
31.1  
9.3  
18.5  
29.3  
8.7  
17.0  
27.5  
8.4  
16.4  
26.0  
Loop static pressure will fluctuate with the seasons. Pres-  
sures will be higher in the winter months than during the warm-  
er months. This fluctuation is normal and should be considered  
when charging the system initially. Run the unit in either heat-  
ing or cooling for several minutes to condition the loop to a  
homogenous temperature.  
0.379  
0.568  
0.757  
14.1  
26.9  
44.0  
13.2  
25.4  
41.0  
12.3  
23.6  
38.3  
11.7  
22.4  
36.5  
0.473  
0.713  
0.947  
33.5  
58.3  
88.5  
31.4  
54.4  
82.8  
29.3  
50.8  
77.1  
27.8  
48.4  
73.3  
When complete, perform a final flush and pressurize the  
loop to a static pressure of 275 to 345 kPa for winter months or  
105 to 135 kPa for summer months.  
After pressurization, be sure to remove the plug from the  
end of the loop pump motor(s) to allow trapped air to be  
discharged and to ensure the motor housing has been flooded.  
Be sure the loop flow center provides adequate flow through  
the unit by checking pressure drop across the heat exchanger.  
Compare the results to the data in Table 10.  
Flushing — Once the piping is complete, units require final  
purging and loop charging. A flush cart pump of at least 1.5 hp  
(1.12 kW) is needed to achieve adequate flow velocity in  
the loop to purge air and dirt particles from the loop. Flush the  
loop in both directions with a high volume of water at a high  
velocity. Follow the steps below to properly flush the loop:  
1. Verify power is off.  
2. Fill loop with water from hose through flush cart before  
using flush cart pump to ensure an even fill. Do not allow  
the water level in the flush cart tank to drop below the  
pump inlet line to prevent air from filling the line.  
20  
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 K 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).  
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.  
Units with Aquazone™ Complete C Control  
STANDBY — Y and W terminals are not active in standby  
mode, however the O and G terminals may be active, depend-  
ing on the application. The compressor will be off.  
COOLING — Y and O terminals are active in Cooling mode.  
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.  
NOTE: On all subsequent compressor calls the random start  
delay is omitted.  
IMPORTANT: All alcohols should be pre-mixed and  
pumped from a reservoir outside of the building or  
introduced under water level to prevent fuming.  
Calculate the total volume of fluid in the piping system. See  
Table 11. Use the percentage by volume in Table 12 to deter-  
mine 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 13 F) set point to avoid nuisance faults.  
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.  
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 ac-  
tive or the W terminal is disregarded. The compressor relay  
will remain on and EH1 is immediately turned on. EH2 will  
turn on after 10 minutes of continual stage 2 demand.  
Table 11 — Approximate Fluid Volume (L)  
per 30 m of Pipe  
PIPE  
DIAMETER (in.)  
VOLUME (l)  
Copper  
1
1.25  
1.5  
15.5  
24.2  
34.8  
NOTE: EH2 will not turn on (or if on, will turn off) if FP1 tem-  
perature is greater than 7.2 C and FP2 is greater than 43.3 C.  
EMERGENCY HEAT — In emergency heat mode, terminal  
W is active while terminal Y is not. Terminal G must be active  
or the W terminal is disregarded. EH1 is immediately turned  
on. EH2 will turn on after 5 minutes of continual emergency  
heat demand.  
Rubber Hose  
Polyethylene  
1
/
14.7  
3
IPS SDR11  
10.6  
17.0  
30.0  
41.2  
68.1  
31.4  
41.2  
64.3  
4
1 IPS SDR11  
1
1 / IPS SDR11  
4
1
/
IPS SDR11  
2
2 IPS SDR11  
1
1
1 / IPS SCH40  
4
2
1 / IPS SCH40  
2 IPS SCH40  
Units with Aquazone Deluxe D Control  
LEGEND  
IPS — Internal Pipe Size  
SCH — Schedule  
SDR — Standard Dimensional Ratio  
STANDBY/FAN ONLY — The compressor will be off. The  
Fan Enable, Fan Speed, and reversing valve (RV) relays will be  
on if inputs are present. If there is a Fan 1 demand, the Fan  
Enable will immediately turn on. If there is a Fan 2 demand,  
the Fan Enable and Fan Speed will immediately turn on.  
NOTE: DIP switch 5 on S1 does not have an effect upon Fan 1  
and Fan 2 outputs.  
NOTE: Volume of heat exchanger is approximately 3.78 liters.  
Table 12 — Antifreeze Percentages by Volume  
MINIMUM TEMPERATURE FOR  
FREEZE PROTECTION (C)  
ANTIFREEZE  
HEATING STAGE 1 — In Heating Stage 1 mode, the Fan  
Enable and Compressor relays are turned on immediately.  
Once the demand is removed, the relays are turned off and the  
control reverts to Standby mode. 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.  
HEATING STAGE 2 — In Heating Stage 2 mode, the Fan  
Enable and Compressor relays are remain on. The Fan Speed  
relay is turned on immediately and turned off immediately  
once the demand is removed. The control reverts to Heating  
Stage 1 mode. If there is a master/slave or dual compressor  
application, all compressor relays and related functions will op-  
erate per their associated DIP switch 2 setting on S1.  
HEATING STAGE 3 — In Heating Stage 3 mode, the Fan  
Enable, Fan Speed and Compressor relays remain on. The EH1  
output is turned on immediately. With continuing Heat Stage 3  
demand, EH2 will turn on after 10 minutes. EH1 and EH2 are  
turned off immediately when the Heating Stage 3 demand is re-  
moved. The control reverts to Heating Stage 2 mode.  
–12  
25  
–9  
21  
–7  
16  
–4  
10  
Methanol (%)  
100% USP Food Grade  
Propylene Glycol (%)  
38  
30  
22  
15  
Cooling Tower/Boiler Systems — These systems typ-  
ically use a common loop temperature maintained at 15.6 to  
32.2 C. Carrier recommends using a closed circuit evaporative  
cooling tower with a secondary heat exchanger between the  
tower and the water loop. If an open type cooling tower is used  
continuously, chemical treatment and filtering will be necessary.  
The optional cupronickel heat exchanger must also be used in  
this case.  
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. Locate air separation in the piping sys-  
tem prior to the fluid re-entering the loop field.  
21  
Output EH2 will be off if FP1 is greater than 7.2 C and FP2  
(when shorted) is greater than 43.3 C during Heating Stage 3  
mode. This condition will have a 30-second recognition time.  
Also, during Heating Stage 3 mode, EH1, EH2, Fan Enable,  
and Fan Speed will be ON if G input is not active.  
EMERGENCY HEAT — In Emergency Heat mode, the Fan  
Enable and Fan Speed relays are turned on. The EH1 output is  
turned on immediately. With continuing Emergency Heat de-  
mand, EH2 will turn on after 5 minutes. Fan Enable and Fan  
Speed relays are turned off after a 60-second delay. The control  
reverts to Standby mode.  
Table 13 — C Control Current LED Status  
and Alarm Relay Operations  
LED STATUS  
DESCRIPTION OF OPERATION  
ALARM RELAY  
Normal Mode  
Open  
Cycle  
(closed 5 sec.,  
Open 25 sec.)  
On  
Normal Mode with  
PM Warning  
Off  
Slow Flash  
Fast Flash  
C Control is non-functional  
Fault Retry  
Open  
Open  
Closed  
Lockout  
Open  
(Closed after  
15 minutes)  
Slow Flash  
Over/Under Voltage Shutdown  
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  
Flashing Code 6 Test Mode — CO Fault in memory  
Cycling Code 1  
Cycling Code 2  
Cycling Code 3  
Cycling Code 4  
Cycling Code 5  
Cycling Code 6  
Output EH1, EH2, Fan Enable, and Fan Speed will be ON if  
the G input is not active during Emergency Heat mode.  
COOLING STAGE 1 — In Cooling Stage 1 mode, the Fan  
Enable, compressor and RV relays are turned on immediately.  
If configured as stage 2 (DIP switch set to OFF) then the com-  
pressor and fan will not turn on until there is a stage 2 demand.  
The fan Enable and compressor relays are turned off immedi-  
ately when the Cooling Stage 1 demand is removed. The con-  
trol 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 func-  
tions will track with their associated DIP switch 2 on S1.  
COOLING STAGE 2 — In Cooling Stage 2 mode, the Fan  
Enable, compressor and RV relays remain on. The Fan Speed  
relay is turned on immediately and turned off immediately  
once the Cooling Stage 2 demand is removed. The control re-  
verts to Cooling Stage 1 mode. If there is a master/slave or dual  
compressor application, all compressor relays and related func-  
tions will track with their associated DIP switch 2 on S1.  
Test Mode — Over/Under  
shutdown in memory  
Flashing Code 7  
Cycling Code 7  
Cycling Code 8  
Cycling Code 9  
Flashing Code 8  
Flashing Code 9  
Test Mode — PM in memory  
Test Mode — FP1/FP2  
Swapped Fault in memory  
LEGEND  
CO  
FP  
HP  
—
—
—
Condensate Overflow  
Freeze Protection  
High Pressure  
LED — Light-Emitting Diode  
LP  
PM  
—
—
Low Pressure  
Performance Monitor  
NOTES:  
1. Slow flash is 1 flash every 2 seconds.  
2. Fast flash is 2 flashes every 1 second.  
3. EXAMPLE: “Flashing Code 2” is represented by 2 fast flashes followed by  
a 10-second pause. This sequence will repeat continually until the fault is  
cleared.  
NIGHT LOW LIMIT (NLL) STAGED HEATING — In NLL  
staged Heating mode, the override (OVR) input becomes ac-  
tive and is recognized as a call for heating and the control will  
immediately go into a Heating Stage 1 mode. With an addition-  
al 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.  
Table 14 — C Control LED Code and  
Fault Descriptions  
LED  
FAULT  
DESCRIPTION  
CODE  
1
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 sec-  
onds before or during a call  
(bypassed for first 60 seconds)  
SYSTEM TEST  
4
5
Freeze Protection Coax  
— FP1  
FP1 below Temp limit for 30 con-  
tinuous seconds (bypassed for  
first 60 seconds of operation)  
FP2 below Temp limit for 30 con-  
tinuous seconds (bypassed for  
first 60 seconds of operation)  
System testing provides the ability to check the control  
operation. The control enters a 20-minute Test mode by  
momentarily shorting the test pins (see Fig. 9-12). All time  
delays are reduced by a factor of 15.  
Freeze Protection Air Coil  
— FP2  
6
7
Condensate overflow  
Over/Under Voltage  
Sense overflow (grounded) for  
30 continuous seconds  
"R" power supply is <19VAC or  
>30VAC  
Performance Monitor Warning  
has occurred.  
Test Mode — To enter Test mode on C or D controls, cycle  
the power 3 times within 60 seconds. The LED (light-emitting  
diode) will flash a code representing the last fault when enter-  
ing the Test mode. The alarm relay will also power on and off  
during Test mode. See Tables 13 and 14. To exit Test mode,  
short the terminals for 3 seconds or cycle the power 3 times  
within 60 seconds.  
(Autoreset) Shutdown  
8
9
PM Warning  
FP1 and FP2 Thermistors FP1 temperature is higher than  
are swapped  
FP2 in heating/test mode, or FP2  
temperature is higher than FP1  
in cooling/test mode.  
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.  
LEGEND  
FP  
HP  
—
—
Freeze Protection  
High Pressure  
LED — Light-Emitting Diode  
LP  
PM  
—
—
Low Pressure  
Performance Monitor  
22  
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 to 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.  
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.  
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.  
Aquazone™ Deluxe D Control LED Indica-  
IMPORTANT: To prevent injury or death due to electrical  
shock or contact with moving parts, open unit disconnect  
switch before servicing unit.  
tors — There are 3 LED indicators on the D Control:  
STATUS LED — Status LED indicates the current status or  
mode of the D control. The Status LED light is green.  
Filters — Filters must be clean for maximum performance.  
Inspect filters every month under normal operating conditions.  
replace when necessary.  
TEST LED — Test LED will be activated any time the 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 and appear as 1 fast flash alternating with a 10-second  
pause. See Table 15.  
IMPORTANT: Units should never be operated with-  
out a filter.  
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.  
Inspect heat exchangers regularly, and clean more frequent-  
ly if the unit is located in a “dirty” environment. Keep the heat  
exchanger 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 105 kPa during the summer  
and 275 kPa during the winter.  
SERVICE  
Perform the procedures outlined below periodically, as  
indicated.  
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.  
Check P trap frequently for proper operation.  
Table 15 — Aquazone™ 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  
D Control is non-functional  
Test Mode  
Off  
—
Off  
On  
—
—
—
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
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  
—
—
—
Open  
Open  
Open  
Open  
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  
Flashing Code 3  
Flashing Code 4  
Flashing Code 5  
Flashing Code 6  
Flashing Code 7  
Flashing Code 2  
Flashing Code 3  
LP Fault  
FP1 Fault  
FP2 Fault  
CO Fault  
Open  
Over/Under Voltage  
HP Lockout  
Open (closed after 15 minutes)  
Closed  
Closed  
Closed  
Closed  
Closed  
LP Lockout  
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 — Condensate Overflow  
ESD — Emergency Shutdown  
FP — Freeze Protection  
HP — High Pressure  
LP — Low Pressure  
PM — Performance Monitor  
4. Fast flash is 2 flashes every 1 second.  
5. EXAMPLE: “Flashing Code 2” is represented by 2 fast flashes  
followed by a 10-second pause. This sequence will repeat contin-  
ually until the fault is cleared.  
23  
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.  
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.  
Checking System Charge — Units are shipped with  
Condensate Drain Pans — Check condensate drain  
pans for algae growth twice a year. If algae growth is apparent,  
consult a water treatment specialist for proper chemical treat-  
ment. Applying an algaecide every three months will typically  
eliminate algae problems in most locations.  
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.  
3. After unit conditions have stabilized, read head pressure  
on discharge line gage.  
Refrigerant System — Verify air and water flow rates  
are at proper levels before servicing. To maintain sealed circuit-  
ry integrity, do not install service gauges unless unit operation  
appears abnormal.  
Check to see that unit is within the superheat and subcool-  
ing temperature ranges shown in Table 16. If the unit is not  
within these ranges, recover and reweigh in refrigerant charge.  
NOTE: Operate unit a minimum of 15 minutes before  
checking charge.  
4. From standard field-supplied Pressure-Temperature chart  
for R-407C, find equivalent bubble point temperature.  
Condensate Drain Cleaning — Clean the drain line  
and unit drain pan at the start of each cooling season. Check  
flow by pouring water into drain. Be sure trap is filled to main-  
tain an air seal.  
FILL CONDENSER WITH  
CLEANING SOLUTION. DO  
PAIL  
NOT ADD SOLUTION  
MORE RAPIDLY THAN  
VENT CAN EXHAUST  
GASES CAUSED BY  
Air Coil Cleaning — Remove dirt and debris from evap-  
orator coil as required by condition of the coil. Clean coil with  
a stiff brush, vacuum cleaner, or compressed air. Use a fin  
comb of the correct tooth spacing when straightening mashed  
or bent coil fins.  
FUNNEL  
CHEMICAL ACTION.  
1”  
PIPE  
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.  
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.  
VENT  
PIPE  
5’ APPROX  
3’ TO 4’  
CONDENSER  
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.  
PAIL  
Fig. 18 — Gravity Flow Method  
Follow all safety codes. Wear safety glasses and rubber  
gloves when using inhibited hydrochloric acid solution.  
Observe and follow acid manufacturer’s instructions.  
GAS VENT  
PUMP  
PRIMING  
CONN.  
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,  
but take care to prevent liquid from being carried over by the  
gases.  
GLOBE  
VALVES  
SUCTION  
SUPPLY  
1” PIPE  
PUMP  
SUPPORT  
Warm solution acts faster, but cold solution is just as effec-  
tive if applied for a longer period.  
CONDENSER  
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. 18.  
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. 19.  
TANK  
REMOVE WATER  
REGULATING VALVE  
RETURN  
FINE MESH  
SCREEN  
Fig. 19 — Forced Circulation Method  
24  
5. Read liquid line temperature on thermometer; then  
subtract from bubble point temperature. The difference  
equals subcooling temperature.  
motor on a high platform such as a step ladder. Do not  
allow motor to hang by its power wires.  
TROUBLESHOOTING  
6. Compare the subcooling temperature with the normal  
temperature listed in Table 9. If the measured liquid line  
temperature does not agree with the required liquid line  
temperature, ADD refrigerant to raise the temperature or  
REMOVE refrigerant (using standard practices) to lower  
the temperature (allow a tolerance of 1.7° C).  
(Fig. 20 and 21, and Table 16)  
When troubleshooting problems with a WSHP, consider the  
following.  
Thermistor — A thermistor may be required for single-  
phase units where starting the unit is a problem due to low  
voltage. See Fig. 20 for thermistor nominal resistance.  
Refrigerant Charging  
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. 21.  
To prevent personal injury, wear safety glasses and gloves  
when handling refrigerant. Do not overcharge system —  
this can cause compressor flooding.  
90.0  
80.0  
70.0  
60.0  
50.0  
40.0  
30.0  
20.0  
10.0  
0.0  
NOTE: Do not vent or depressurize unit refrigerant to atmo-  
sphere. Remove and reclaim refrigerant following accepted  
practices.  
Air Coil Fan Motor Removal  
Before attempting to remove fan motors or motor mounts,  
place a piece of plywood over evaporator coils to prevent  
coil damage.  
Disconnect motor power wires from motor terminals before  
motor is removed from unit.  
1. Shut off unit main power supply.  
0.0  
20.0  
40.0  
60.0  
80.0 100.0 120.0 140.0  
2. Loosen bolts on mounting bracket so that fan belt can be  
removed.  
Temperature (degF)  
3. Loosen and remove the 2 motor mounting bracket bolts  
on left side of bracket.  
Fig. 20 — Thermistor Nominal Resistance  
4. Slide motor/bracket assembly to extreme right and lift out  
through space between fan scroll and side frame. Rest  
AIR  
COIL  
SUCTION  
AIRFLOW  
(°F)  
AIRFLOW  
(°F)  
COMPRESSOR  
THERMISTOR  
EXPANSION  
VALVE  
COAX  
DISCHARGE  
FP2  
FP1  
CONDENSATE  
OVERFLOW  
(CO)  
LIQUID  
LINE  
WATER IN  
WATER OUT  
AIR COIL  
WATER  
COIL  
PROTECTION  
FREEZE  
PROTECTION  
LEGEND  
COAX — Coaxial Heat Exchanger  
Airflow  
Refrigerant Liquid Line Flow  
Fig. 21 — FP1 and FP2 Thermistor Location  
25  
Table 16 — 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.  
HP Fault — Code 2  
High Pressure  
X
X
Reduced or no water flow in Check pump operation or valve operation/setting.  
cooling  
Check water flow adjust to proper flow rate.  
Water temperature out of  
range in cooling  
Bring water temperature within design parameters.  
X
X
Reduced or no airflow in  
heating  
Check for dirty air filter and clean or replace.  
Check fan motor operation and airflow restrictions.  
Dirty air coil — construction dust etc.  
External static too high. Check Table 4.  
Air temperature out of range Bring return air temperature within design parameters.  
in heating  
X
X
X
X
X
X
X
Overcharged with refrigerant Check superheat/subcooling vs typical operating condition Table 9.  
Bad HP switch  
Insufficient charge  
Check switch continuity and operation. Replace.  
Check for refrigerant leaks.  
LP/LOC Fault — Code 3  
Low Pressure/Loss of  
Charge  
Compressor pump down at Check charge and start-up water flow.  
start-up  
FP1 Fault — Code 4  
Water Freeze Protection  
X
Reduced or no water flow in Check pump operation or water valve operation/setting.  
heating  
Plugged strainer or filter. Clean or replace.  
Check water flow adjust to proper flow rate.  
X
X
Inadequate antifreeze level Check antifreeze density with hydrometer.  
Improper freeze protect set- Clip JW2 jumper for antifreeze (–12.2 C) use.  
ting (–1.1 C vs –12.2 C)  
X
X
Water temperature out of  
range  
Bring water temperature within design parameters.  
X
X
Bad thermistor  
Reduced or no airflow in  
cooling  
Check temperature and impedance correlation.  
Check for dirty air filter and clean or replace.  
Check fan motor operation and airflow restrictions.  
External static too high. Check Table 4.  
FP2 Fault — Code 5  
Air Coil Freeze  
Protection  
X
X
Air temperature out of range Too much cold vent air. Bring entering air temperature within design  
parameters.  
Improper freeze protect set- Normal airside applications will require –1.1 C only.  
ting (–1.1 C vs –12.2 C)  
X
X
X
X
X
X
X
Bad thermistor  
Blocked drain  
Improper trap  
Poor drainage  
Check temperature and impedance correlation.  
Check for blockage and clean drain.  
Check trap dimensions and location ahead of vent.  
Check for piping slope away from unit.  
Condensate Fault —  
Code 6  
Check slope of unit toward outlet.  
Poor venting. Check vent location.  
X
X
Moisture on sensor  
Under voltage  
Check for moisture shorting to air coil.  
Over/Under Voltage —  
Code 7  
(Auto Resetting)  
X
Check power supply and 24 vac voltage before and during operation.  
Check power supply wire size.  
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.  
X
X
X
X
Over voltage  
Performance Monitor —  
Code 8  
Heating mode FP2> 51.7 C Check for poor airflow or overcharged unit.  
Cooling mode FP1> 51.7 C Check for poor water flow or airflow.  
OR FP2< 4.4 C  
FP1 and FP2  
Thermistors —  
Code 9  
X
FP1 temperature is higher  
than FP2 temperature.  
FP2 temperature is higher  
than FP1 temperature.  
Swap FP1 and FP2 thermistors.  
X
Swap FP1 and FP2 thermistors.  
No Fault Code Shown  
Unit Short Cycles  
X
X
X
X
X
X
X
X
X
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.  
Dirty air filter  
Unit in 'Test Mode'  
Unit selection  
Compressor overload  
Thermostat position  
Unit locked out  
Check and clean air filter.  
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.  
Only Fan Runs  
Ensure thermostat set for heating or cooling operation.  
Check for lockout codes. Reset power.  
Check compressor overload. Replace if necessary.  
Check Y and W wiring at heat pump. Jumper Y and R for compressor  
operation in Test mode.  
Compressor overload  
Thermostat wiring  
LEGEND  
RV — Reversing Valve  
26  
Table 16 — Troubleshooting (cont)  
FAULT  
HEATING COOLING  
POSSIBLE CAUSE  
SOLUTION  
Only Compressor Runs  
X
X
X
X
Thermostat wiring  
Fan motor relay  
Check G wiring at heat pump. Jumper G and R for fan operation.  
Jumper G and R for fan operation. Check for line voltage across BR  
contacts.  
Check fan power enable relay operation (if present).  
Check for line voltage at motor. Check capacitor.  
X
X
X
X
Fan motor  
Thermostat wiring  
Check Y and W wiring at heat pump. Jumper Y and R for compressor  
operation in Test mode.  
Unit Does Not Operate in  
Cooling  
X
Reversing valve  
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  
operating, engage and disengage RV coil voltage to push valve.  
X
X
X
Thermostat setup  
Thermostat wiring  
Dirty filter  
Check for 'O' RV setup not 'B'.  
Check O wiring at heat pump. Jumper O and R for RV coil 'Click'.  
Replace or clean.  
Insufficient Capacity/  
Not Cooling or Heating  
Properly  
X
X
Reduced or no airflow in  
heating  
Check for dirty air filter and clean or replace.  
Check fan motor operation and airflow restrictions.  
External static too high. Check blower Table 4.  
Check for dirty air filter and clean or replace.  
Check fan motor operation and airflow restrictions.  
External static too high. Check blower Table 4.  
X
X
Reduced or no airflow in  
cooling  
X
Leaky ductwork  
Check supply and return air temperatures at the unit and at distant duct  
registers if significantly different, duct leaks are present.  
X
X
X
X
X
X
Low refrigerant charge  
Restricted metering device Check superheat and subcooling Table 9. Replace.  
Check superheat and subcooling Table 9.  
Defective reversing valve  
Thermostat improperly  
located  
Perform RV touch test.  
Check location and for air drafts behind thermostat.  
X
X
X
X
X
X
Unit undersized  
Recheck loads and sizing check sensible cooling load and heat pump  
capacity.  
Perform scaling check and clean if necessary.  
Scaling in water heat  
exchanger  
Inlet water too hot or cold  
X
X
Check load, loop sizing, loop backfill, ground moisture.  
Check for dirty air filter and clean or replace.  
Check fan motor operation and airflow restrictions.  
External static too high. Check blower Table 4.  
High Head Pressure  
Reduced or no airflow in  
heating  
X
X
Reduced or no water flow in Check pump operation or valve operation/setting.  
cooling  
Check water flow; adjust to proper flow rate. See Table 8.  
Inlet water too hot  
Check load, loop sizing, loop backfill, ground moisture.  
X
Air temperature out of range Bring return air temperature within design parameters.  
in heating  
X
Scaling in water heat  
exchanger  
Perform scaling check and clean if necessary.  
X
X
X
X
Unit overcharged  
Check superheat and subcooling. Reweigh in charge.  
Vacuum system and reweigh in charge.  
Non-condensables in  
system  
X
X
X
Restricted metering device Check superheat and subcooling per Table 9. Replace.  
Low Suction Pressure  
Reduced 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.  
X
Water temperature out of  
range  
Bring water temperature within design parameters.  
X
Reduced airflow in cooling Check for dirty air filter and clean or replace.  
Check fan motor operation and airflow restrictions.  
External static too high. Check blower Table 4.  
X
X
Air temperature out of range Too much cold vent air. Bring entering air temperature within design  
parameters.  
X
X
X
Insufficient charge  
Too high airflow  
Poor performance  
Too high airflow  
Unit oversized  
Check for refrigerant leaks.  
Check blower Table 4.  
See 'Insufficient Capacity'.  
Check blower Table 4.  
Recheck loads and sizing check sensible cooling load and heat pump  
capacity.  
Low Discharge Air  
Temperature in Heating  
High Humidity  
X
X
LEGEND  
RV — Reversing Valve  
27  
Copyright 2004 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Catalog No. 005-00042 Printed in U.S.A. Form 50RHE-C1SI Pg 30 2-04 Replaces: New  
Book 1  
4
Tab 5a 5a  
50RHE R-407C UNIT  
START-UP CHECKLIST  
CUSTOMER:___________________________  
MODEL NO.:___________________________  
JOB NAME: _______________________________________  
SERIAL NO.:____________________  
DATE:_________  
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  
L/S  
L/S  
HEATING CYCLE:  
FLUID IN  
C
C
C
AIR COIL  
COOLING CYCLE:  
AIR IN  
HEATING CYCLE:  
AIR IN  
AIR OUT  
CL-1  
HEATING CYCLE ANALYSIS  
kPa  
°C  
DEW  
POINT  
AIR  
COIL  
SUCTION  
°C  
°C  
COMPRESSOR  
DISCHARGE  
EXPANSION  
VALVE  
COAX  
°C  
LIQUID LINE  
°C  
kPa  
WATER IN  
°C  
kPa  
WATER OUT  
LOOK UP PRESSURE DROP IN TABLE 10  
TO DETERMINE FLOW RATE  
COOLING CYCLE ANALYSIS  
kPa  
°C  
DEW  
POINT  
AIR  
COIL  
SUCTION  
°C  
°C  
COMPRESSOR  
DISCHARGE  
EXPANSION  
VALVE  
COAX  
°C  
LIQUID LINE  
°C  
kPa  
WATER IN  
°C  
kPa  
WATER OUT  
LOOK UP PRESSURE DROP IN TABLE 10  
TO DETERMINE FLOW RATE  
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 DEW POINT TEMPERATURE  
(DEG C)  
=
SUBCOOLING = DISCHARGE BUBBLE POINT TEMPERATURE – LIQUID LINE TEMPERATURE  
(DEG C)  
=
*Use 4.16 for water, 4.03 for antifreeze.  
Copyright 2004 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
Tab  
1
4
Catalog No. 005-00042  
Printed in U.S.A.  
Form 50RHE-C1SI  
Pg CL-2  
2-04  
Replaces: New  
5a 5a  

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