Carrier Aquazone VQP 072 Dimensions and installation guide

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500376-01 Printed in U.S.A. Form 50HQP-VQP-7SI Pg 1 7-23 Replaces: 50HQP-VQP-6SI
Installation, Start-Up, and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PRE-INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . 2
•INSPECTION
• STORAGE
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 1 — Check Jobsite . . . . . . . . . . . . . . . . . . . . . . . 3
• HORIZONTAL UNITS (50HQP)
• VERTICAL UNITS (50VQP)
• INSTALLATION GUIDELINES (ALL UNITS)
Step 2 — Check Unit . . . . . . . . . . . . . . . . . . . . . . . . . 13
•INSPECTUNIT
Step 3 — Locate Unit . . . . . . . . . . . . . . . . . . . . . . . . 13
•PROTECTION
• TAKE APART CONSTRUCTION ASSEMBLY
• DISASSEMBLY INSTRUCTION
• ASSEMBLY INSTRUCTION
Step 4 — Mount the Unit . . . . . . . . . . . . . . . . . . . . . . 14
• MOUNTING VERTICAL UNITS
• MOUNTING HORIZONTAL UNITS
Step 5 — Check Duct System . . . . . . . . . . . . . . . . . 15
Step 6 — Install Condensate Drain . . . . . . . . . . . . . 15
Step 7 — Pipe Connections . . . . . . . . . . . . . . . . . . . 16
• WATER QUALITY GUIDELINES
• UNITS WITH WATERSIDE ECONOMIZER OR
BOILERLESS HEAT CONTROL
• WELL WATER SYSTEMS (50°F EWT [ENTERING
WATER TEMPERATURE] MINIMUM)
• COOLING TOWER/BOILER APPLICATION
• EARTH COUPLED SYSTEMS
Step 8 — Wire Field Power Supply . . . . . . . . . . . . . 18
• CONTROL TRANSFORMER SETTING FOR 208V
UNITS
• 50HQP WITH SUPPLY FAN VFD
Step 9 — Wire Control Connections . . . . . . . . . . . . 39
• COMPLETE C AND DELUXE D CONTROL
• THERMOSTAT AND DDC SENSORS
• HOT GAS REHEAT CONTROL
• AUXILIARY RELAY (DELUXE D ONLY)
• ENERGY MANAGEMENT SWITCH (DELUXED
ONLY)
• BOILERLESS HEAT CONTROL (DELUXED ONLY)
• ALARM OUTPUT (ALL UNITS)
• WSHP OPEN CONTROL
• CONTROL TRANSFORMER
• 1-SPEED VFD FIELD CONTROL WIRING (50HQP
UNITS ONLY)
• SAV VFD FIELD CONTROL WIRING (50HQP UNITS
ONLY)
Step 10 — Configure Unit Control Components . . .41
• UNIT PROTECTION MODULE (UPM)
• WATER SIDE ECONOMIZER OPTION
• BOILERLESS HEAT CONTROL (DELUXE D ONLY)
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
• CLEAN AIR COIL
Blower Drive Assembly . . . . . . . . . . . . . . . . . . . . . . .45
Fan Sheaves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
• ALIGNMENT
Evaporator Fan Performance Adjustment . . . . . . . .46
• BELT TENSION ADJUSTMENT
System Flushing and Filling . . . . . . . . . . . . . . . . . . .47
System Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
• FLOW VERIFICATION
• FLOW REGULATION
• ANTIFREEZE
• FREEZE PROTECTION SELECTION
•START-UP
Operating Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
• ENVIRONMENT
• POWER SUPPLY
• UNIT STARTING CONDITIONS
Start Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . .49
• SCROLL COMPRESSOR ROTATION
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Power Up Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Unit Protection Module (UPM) . . . . . . . . . . . . . . . . .52
Units with Complete C or Deluxe D Controls . . . . .54
• STANDBY
• COOLING
• HEATING STAGE 1
• HEATING STAGE 2
• LOCKOUT MODE
• HOT GAS REHEAT (OPTIONAL FOR COMPLETE C OR
DELUXE D CONTROLS)
• WATERSIDE ECONOMIZER (OPTIONAL FOR
COMPLETE C OR DELUXE D CONTROLS)
• BOILERLESS HEAT (DELUXE D ONLY)
• PUMP/VALVE RELAY (DELUXE D ONLY)
Units with WSHP Open Controls . . . . . . . . . . . . . . .54
• COOLING
• REVERSE CYCLE HEATING
• TWO POSITION OA DAMPER
• MODULATING OA DAMPER WITH DCV
• AUXILIARY MODULATING HOT WATER / STEAM 
HEATING REHEAT
• TWO-POSITION HOT WATER/STEAM 
HEATING REHEAT
• SINGLE STAGE ELECTRIC AUXILIARY HEAT
• AUTOMATIC FAN SPEED CONTROL
Aquazone™
50HQP,VQP 072-360
Large Capacity Water Source Heat Pumps

2
• FAN SPEED CONTROL - DURING HEATING
• FAN SPEED CONTROL - DURING COOLING
• MODULATING WATER ECONOMIZER CONTROL
• TWO-POSITION WATER ECONOMIZER CONTROL
• POWER FAIL RESTART DELAY
• SUPPLY AIR TEMPERATURE MONITORING/
CONTROL/ ALARM
• DEHUMIDIFICATION
• SPACE TEMPERATURE ALARMS
• CONDENSER WATER TEMPERATURE
MONITORING/CONTROL/ALARM
• HIGH CONDENSATE / OVERFLOW ALARM
• FILTER STATUS ALARM
• COMPRESSOR FAULT/LOCKOUT ALARM
• INSUFFICIENT VENTILATION ALARM
• RELATIVE HUMIDITY ALARM
• TIME SCHEDULES
• HOLIDAY SCHEDULES
• OVERRIDE SCHEDULES
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Water Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Condensate Drain Pans . . . . . . . . . . . . . . . . . . . . . . 58
Refrigerant System . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Fan Motor Lubrication . . . . . . . . . . . . . . . . . . . . . . . . 58
Fan Bearing Lubrication . . . . . . . . . . . . . . . . . . . . . . 58
Condensate Drain Cleaning . . . . . . . . . . . . . . . . . . . 58
Air Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Condenser Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . 58
• GRAVITY FLOW METHOD
• FORCED CIRCULATION METHOD
Checking System Charge . . . . . . . . . . . . . . . . . . . . . 59
Refrigerant Charging . . . . . . . . . . . . . . . . . . . . . . . . . 59
Air Coil Fan Motor Removal . . . . . . . . . . . . . . . . . . . 59
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 60
• UNIT PROTECTION MODULE (UPM)
Freeze Protection Sensors . . . . . . . . . . . . . . . . . . . . 62
Thermostatic Expansion Valves . . . . . . . . . . . . . . . 62
• TXV FAILURE
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install, repair, or
service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions 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 precautions in the
literature, tags and labels attached to the unit, and other safety
precautions that may apply.
Improper installation, adjustment, alteration, service,
maintenance, 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 servicing or repairing this product. Refer to the individual
instructions packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloth for brazing operations. Have fire extinguisher
available. Read these instructions thoroughly and follow all
warnings or cautions attached to the unit. Consult local building
codes and the National Electrical Code (NEC) for special
installation requirements.
Understand the signal words — DANGER, WARNING, and
CAUTION. DANGER identifies the most serious hazards which
will result in severe personal injury or death. WARNING signifies
hazards that could result in personal injury or death. CAUTION is
used to identify unsafe practices, which would result in minor
personal injury or product and property damage.
It is important to recognize safety information. This is the safety-
alert symbol . When you see this symbol on the unit and in
instructions or manuals, be alert to the potential for personal
injury.
GENERAL
This Installation and Start-Up Instructions literature is for
Aquazone™ water source heat pump systems.
Water source heat pumps (WSHPs) are single-package vertically
or horizontally mounted units with a reversible refrigeration cy-
cle for year-round cooling and heating.
PRE-INSTALLATION
INSPECTION
Upon receipt of shipment, carefully check the shipment against
the bill of lading. Make sure all units have been received. Inspect
the carton or crating of each unit, and inspect each unit for damage
on both the interior and exterior. Ensure the shipping company
makes proper notation of any shortages or damage on all copies of
the freight bill. Concealed damage not discovered during unload-
ing must be reported to the shipping company within 5 days of re-
ceipt of shipment.
NOTE: It is the responsibility of the purchaser to file all necessary
claims with the shipping company.
STORAGE
IMPORTANT: Read the entire instruction manual before
starting installation.
WARNING
Electrical shock can cause personal injury and death. Shut off
all power to this equipment during installation and service.
There may be more than one disconnect switch. Tag all
disconnect locations to alert others not to restore power until
work is completed.
IMPORTANT: The installation of water source heat pump units
and all associated components, parts, and accessories which
make up the installation shall be in accordance with the
regulations of ALL authorities having jurisdiction and MUST
conform to all applicable codes. It is the responsibility of the
installing contractor to determine and comply with ALL
applicable codes and regulations.
CAUTION
EQUIPMENT DAMAGE HAZARD
DO NOT store or install units in corrosive environments or in
locations subject to temperature or humidity extremes (e.g., at-
tics, 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.

3
If the equipment is not needed for immediate installation upon its
arrival at the job site, it should be left in its shipping carton and
stored in a clean, dry area between 50°F and 95°F. Units must only
be stored or moved in the normal upright position as indicated by
the UP arrows on each carton at all times. DO NOT STACK
UNITS.
INSTALLATION
Step 1 — Check Jobsite
Installation, operation and maintenance instructions are provided
with each unit. Before unit start-up, read all manuals and become
familiar with the unit and its operation. Thoroughly check out the
system before operation. Complete the inspections and instruc-
tions listed below to prepare a unit for installation. See Table 1
for unit physical data.
HORIZONTAL UNITS (50HQP)
Horizontal units are designed for indoor installation only, using
hanging brackets. See Fig. 1 for the field-installed VFD shipping
location. See Fig. 2 and 3 for overall unit dimensions. Be sure to
allow adequate space around the unit for installation and servicing.
See Fig. 7 for service clearance requirements.
VERTICAL UNITS (50VQP)
Vertical units are designed for indoor installations only. Vertical
units are typically installed in a floor-level mechanical room or in
the occupied space. See Fig 2-6 for unit dimensions. Be sure to al-
low adequate space around the unit for installation and servicing.
See Fig. 4 for service clearance requirements. See Fig. 8 and 9 for
take apart construction units.
INSTALLATION GUIDELINES (ALL UNITS)
1. Be sure that the location chosen for unit installation pro-
vides ambient temperatures maintained above freezing.
2. Be sure the installation location is isolated from sleeping
areas, private offices and other acoustically sensitive
spaces.
3. Be sure unit is mounted at a height sufficient to provide an
adequate slope of the condensate lines. If an appropriate
slope cannot be achieved, a field-supplied condensate
pump may be required.
4. On horizontal units, allow adequate room below the unit
for condensate drain trap and do not locate the unit above
supply piping.
5. Provide sufficient space for duct connection. Do not allow
the weight of the ductwork to rest on the unit.
6. Provide adequate clearance for filter replacement and
drain pan cleaning. Do not allow piping, conduit, etc. to
block filter access.
7. Provide sufficient access to allow maintenance and servic-
ing of the blower and blower motor, compressor and coils.
Removal of the entire unit from the installation area
should not be necessary.
8. Provide an unobstructed path to the unit within the closet
or mechanical room. Space should be sufficient to allow
return air to freely enter the space.
9. Provide ready access to water valves and fittings, and
screwdriver access to unit side panels, discharge collar,
and all electrical connections.
10. Where access to side panels is limited, pre-removal of the
control box side mounting screws may be necessary for
future servicing.
11. For units with dual supply fan outlets, ensure the installa-
tion area has sufficient clearance for a pair of pants duct
discharge.
12. 50HQP only - for units with SAVTM or supply fan VFD
option, select installation location for the VFD. If VFD
location results in motor wiring that exceeds 10 ft, con-
sider use of shaft grounding rings (field provided).
Fig. 1 — Field Installed VFD Shipping Location,
50HQP Units
CAUTION
EQUIPMENT DAMAGE HAZARD
To avoid equipment damage, do not use these units as a source
of heating or cooling during the construction process. The
mechanical components and filters used in these units quickly
become clogged with construction dirt and debris which may
cause system damage.
IMPORTANT: It is the installation contractors responsibility to
ensure that all equipment is installed with proper access for
service, installation, and removal in accordance with Carrier’s
recommended service clearance and installation instructions.
Please refer to the Carrier Commercial WSHP Warranty
Statement (document number 04-570008-01) for details on
warranty exclusions regarding equipment access, removal and
clearances.

4
Table 1 — 50HQP and 50VQP Unit Physical Data
50HQP,VQP UNIT SIZE 072 096 120 150 151 180
Compressor Type Scroll Scroll Scroll Scroll Scroll Scroll
Quantity 2 2 2 2 2 2
Total Refrigerant Charge (lb) Vert/Horiz 9.88/9.13 10/11.25 12.38 14 13.38 15.88
Air Coil Dimensions (in.) H x L (Qty) 20 x 32.5 (2) 20 x 32.5 (2) 20 x 32.5 (2) 24 x 65 (1) 24 x 43 (2) 24 x 65 (1)
Rows 3 3 3 3 3 3
Horizontal Filter Size (in.) 
(Nominal) (Qty)
20 x 34-1/2 x 1
(2)
20 x 34-1/2 x 1
(2)
20 x 34-1/2 x 1
(2) 24 x 34 x 1 (2) N/A 24 x 34 x 1 (2)
Vertical Filter Size (in.) 
(Nominal) (Qty)
20 x 34-1/2 x 1
(2)
20 x 34-1/2 x 1
(2)
20 x 34-1/2 x 1
(2) N/A 24 x 24 x 1 (4) N/A
Blower Wheel Size (in.) 
(Dia. x W) (Qty) 12 x 12 (1) 12 x 12 (1) H: 12 x 9 (2) V: 15 x 15 (1) 15 x 15 (1) 15 x 15 (1) 12 x 12 (2)
Fan Allowable Max. (rpm) 1800 1800 H: 1800
V: 1600 1600 1600 1600
Std. Motor HP (Qty) Horizontal 1 (1) 2 (1) 3 (1) 3 (1) N/A 2 (2)
Vertical 1 (1) 1-1/2 (1) 2 (1) NA 3 (1) N/A
Type Ball Bearing Ball Bearing Ball Bearing Ball Bearing Ball Bearing Ball Bearing
Horizontal Water Connections (in.) FPT 1 1 1-1/4 1-1/2 N/A 1-1/2
Vertical Water Connections (in.) FPT 1 1 1-1/2 N/A 1-1/2 N/A
Water Coil Type Coaxial Coaxial Coaxial Coaxial Coaxial Coaxial
Coil Volume (gal) 0.64 0.64 0.87 1.06 1.06 1.06
Rated Water Flow Rate (gpm) 14.0 18.0 24.0 30.0 30.0 32.0
Water Pressure Drop at Rated Flow (psig)
and (ft. hd) Water Loop Cooling 4.8/11.0 5.1/11.7 4.3/10.0 3.0/7.0 3.0/7.0 3.4/7.9
Horizontal Condensate Connection (in.)
FPT 3/4 3/4 3/4 3/4 N/A 1-1/4
Vertical Condensate Connection (in.) FPT 3/4 3/4 3/4 N/A 3/4 N/A
Unit Ship Weight (Vert/Horiz) (lb) 715/715 752/752 980/980 N/A/1150 1140/N/A N/A/1620
Unit Operating Weight (Vert/Horiz) (lb) 670/670 702/702 935/935 N/A/1060 1050/N/A N/A/1530
50HQP,VQP UNIT SIZE 181 210 240 242 300 360
Compressor Type Scroll Scroll Scroll Scroll Scroll Scroll
Quantity 2 2 2 2 2 2
Total Refrigerant Charge (lb) 15.25 16.25 18.13 18.13 18.13 36.00
Air Coil Dimensions (in.) H x L (Qty) 24 x 43 (2) 20 x 32.5 (4) 20 x 32.5 (4) 34 x 65 (1) 20 x 32.5 (4) 30 x 32.5 (2)
Rows 3 3 3 3 3 3
Horizontal Filter Size (in.) (Nominal) (Qty) N/A N/A N/A 17-1/4 x 34-1/2
x 1 (4) N/A N/A
Vertical Filter Size (in.) (Nominal) (Qty) 24 x 24 x 1
(4)
20 x 34-1/2 x 1
(4)
20 x 34-1/2 x 1
(4) N/A 20 x 34-1/2 x 1 (4)
30 x 34-1/2 x 1
(4)
Blower Wheel Size (in.) (Dia. x W) (Qty) 15 x 15 (1) 15 x 15 (2) 15 x 15 (2) 15 x 15 (2) 15 x 15 (2) 15 x 15 (2)
Fan Allowable Max. (rpm) 1600 1600 1600 1600 1600 1600
Std. Motor HP (Qty) Horizontal N/A N/A N/A 2 (2) N/A N/A
Vertical 5 (1) 1-1/2 (2) 2 (2) N/A 3 (2) 5 (2)
Type Ball Bearing Ball Bearing Ball Bearing Ball Bearing Ball Bearing Ball Bearing
Horizontal Water Connections (in.)FPT N/A N/A N/A 2 N/A N/A
Vertical Water Connections (in.) FPT 1-1/2 2 2 N/A 2 2
Water Coil Type Coaxial Coaxial Coaxial Coaxial Coaxial Coaxial
Coil Volume (gal) 1.06 3.04 3.40 3.40 3.40 3.31
Rated Water Flow Rate (gpm) 32.0 50.0 50.0 50.0 60.0 80.0
Water Pressure Drop at Rated Flow (psig)
and (ft. hd) Water Loop Cooling 3.4/7.9 6.4/14.8 4.0/9.3 4.0/9.3 5.5/12.8 8.6/19.8
Condensate Connection (in.) FPT 3/4 1-1/4 1-1/4 1-1/4 1-1/4 1-1/4
Unit Ship Weight (Vert/Horiz) (lb) 1180/N/A 1180/N/A 1400/N/A N/A/1755 1630/N/A 1750/N/A
Unit Operating Weight (Vert/Horiz) (lb) 1090/N/A 1090/N/A 1310/N/A N/A/1655 1530/N/A 1650/N/A

5
x
Fig. 2 — 50HQP072-150 Unit Dimensions
50HQP
UNIT
SIZE
HEIGHTaWIDTH DEPTHb
RETURN AIR CONDENSER WATER CONNECTIONS SUPPLY AIR
(Blower Outlets) REPLACEMENT
FILTER SIZE
(NOMINAL)
ABC E F G H
DIAMETER
(FPT) JKL
072 21.50 38.00 78.00 2.00 20.50 18.50 28.00 2.75 28.00 14.50 1 15.50 13.50 10.50 20 x 34-1/2 x 1
(2 per unit)
096 21.50 38.00 78.00 2.00 20.50 18.50 26.25 3.50 28.00 19.25 1 15.50 13.50 10.50
120 21.50 38.00 78.00 2.00 20.50 18.50 27.50 3.38 28.00 16.75 1.25 12.50 13.50 5.25
150 25.50 42.00 82.00 2.00 20.50 18.50 24.00 2.75 24.00 17.75 1.50 18.50 16.00 14.00 24 x 34 x 1
(2 per unit)
NOTE(S):
a. All dimensions in inches unless otherwise noted. All dimensions within ± 0.125-in. Specifications subject to change without notice. Condensate connections are
0.75 in. FPT on sizes 072-150.
b. When WSHP Open controller is installed increase depth by 3.00 inches.
c. Front of the unit is considered as the side with electrical connections.
d. Distance from condensate drain center line to the bottom of the unit is 1-1/4 inches.
1.00
MOUNTING HOLES
5/8 IN. DIAMETER
3.00
4.50 2.00
1.50
J
J
L
5.50
K
H
G
E
F
CONDENSER
WATER IN
CONDENSER WATER OUT
RETURN
AIR
BLOWER MOTOR ORIENTATION
CONDENSATE
DRAIN 2
120
LEFT RETURN, RIGHT DISCHARGE
RETURN
AIR
CONDENSATE DRAIN 2
BLOWER MOTOR ORIENTATION
J
L
K
H
F
CONDENSER
WATER IN
G
CONDENSER WATER OUT
072, 096, AND 150
LEFT RETURN, RIGHT DISCHARGE
E
WIDTH
ELECTRICAL CONNECTIONSC
B
CONDENSATE DRAIN 1
DEPTH
A
66.00
HEIGHT
C
RETURN
AIR
ELECTRICAL BOX
072, 096, 120, AND 150
LEFT RETURN, RIGHT DISCHARGE
38.0
20.5
ELECTRICAL BOX
ELECTRICAL
CONNECTIONSC
CONDENSATE
DRAIN
78.0
21.5
18.5
2.0
66.0
RETURN
AIR
CONDENSATE
DRAIN 2
13.5
9.0
15.5
CONDENSER
WATER IN
CONDENSER
WATER OUT
28.0
19.25
3.5
26.25
072 AND 096
LEFT RETURN, BACK DISCHARGE

6
Fig. 3 — 50HQP180,242 Unit Dimensions
50HQP
UNIT
SIZE
HEIGHTa
NOTE(S):
a. All dimensions in inches unless otherwise noted. All dimensions within ± 0.125-in. Specifications subject to change without notice. Condensate connections are
1.25 in. FPT on sizes 180 and 242.
WIDTH DEPTHb
b. When WSHP Open controller is installed increase depth by 3.00 inches.
RETURN AIR CONDENSER WATER CONNECTIONSc
c. Front of the unit is considered as the side with electrical connections.
d. Distance from condensate drain center line to the bottom of the unit is 1-1/4 inches.
SUPPLY AIR
(Blower Outlets) REPLACEMENT
FILTER SIZE
(NOMINAL)
AB C E F G H
DIAMETER
(FPT) JKLM
180 25.25 60.25 106.50 2.00 24.00 22.00 22.00 6.25 22.00 16.00 1.5 27.75 17.25 5.00 4.00 24 x 34 x 1
(2 per unit)
242 36.00 60.25 106.50 2.00 34.75 32.75 24.50 7.25 24.50 19.62 2.0 23.75 19.75 7.75 9.75 17-1/4 x 34-1/2 x 1
(4 per unit)
MOUNTING HOLES
1 IN. DIAMETER
1.50
4.00
1.00
3.00
3.00 7.00
MOUNTING BRACKET
SECTION VIEW
B
C
A
67.00
DEPTH
HEIGHT
WIDTH
CONDENSATE
DRAIN 1
ELECTRICAL BOX
ELECTRICAL CONNECTIONS
RETURN
AIR
G
E
H
F
CONDENSER
WATER IN
CONDENSER
WATER OUT
J
J
M
L
K
CONDENSATE DRAIN 2
BLOWER MOTOR
ORIENTATION
LEFT RETURN, RIGHT DISCHARGE
RETURN
AIR
LEFT RETURN, RIGHT DISCHARGE

7
Fig. 4 — 50VQP072-120 Units
50VQP
UNIT
SIZE
HEIGHTa
NOTE(S):
a. All dimensions in inches unless otherwise noted. All dimensions within ± 0.125-in. Specifications subject to change without notice. Condensate connections are
0.75 in. FPT on sizes 072-120.
WIDTH DEPTHb
b. When WSHP Open controller is installed increase depth by 3.00 inches.
CONDENSER WATER CONNECTIONSc
c. Front of unit is side with water and electrical connections.
DUCT
FLANGE
FILTER
RACK REPLACEMENT FILTER
SIZE (NOMINAL)
ABCDiameter
(FPT) DE
072 62.00 42.00 32.00 14.75 8.50 2.75 1
38.00 40.00 20 x 34-1/2 x 1 (2)096 62.00 42.00 32.00 14.75 8.50 2.75 1
120 62.00 42.00 32.00 15.00 9.00 3.00 1-1/2
E
C
BA
HEIGHT
CONDENSER WATER OUT
CONDENSATE DRAIN
CONDENSER WATER IN
D
42.00
32.00
ELECTRICAL
CONNECTIONS
24.00
20.00
9.00
6.00 34.00
22.00
34.00
28.00
7.00
2.00
17.50
22.00
BLOWER
MOTOR
ORIENTATION
TOP SUPPLY TOP SUPPLY REAR SUPPLY
TOP SUPPLY
24.00
6.00
9.00 20.00
C
BA
HEIGHT
CONDENSER WATER OUT
CONDENSATE DRAIN
CONDENSER WATER IN
32.00
ELECTRICAL
CONNECTIONS
BLOWER
MOTOR
ORIENTATION
42.00
HEIGHT
17.50
2.00 7.00
28.00
A
B
C
32.00 BLOWER
MOTOR
ORIENTATION
ELECTRICAL
CONNECTIONS
22.00
E
D
34.00
OPTIONAL
BLOWER
ORIENTATION
OPTIONAL
BLOWER
ORIENTATION
STANDARD
BLOWER
ORIENTATION
RETURN
AIR
RETURN
AIR RETURN
AIR
RETURN
AIR
RETURN
AIR
FRONT SUPPLY TOP SUPPLY
FRONT RETURN
REAR RETURN

8
Fig. 5 — 50VQP151,181 Unit Dimensions
50VQP
UNIT
SIZE
HEIGHTa
NOTE(S):
a. All dimensions in inches unless otherwise noted. All dimensions within ± 0.125-in. Specifications subject to change without notice. Condensate connections are
0.75 in. FPT on sizes 151 and 181.
WIDTH DEPTHb
b. When WSHP Open controller is installed increase depth by 3.00 inches.
CONDENSER WATER CONNECTIONSc
c. Front of unit is side with water and electrical connections.
DUCT
FLANGE
FILTER
RACK REPLACEMENT
FILTER SIZE
(NOMINAL)
ABC
Diameter
(FPT) DE
151 70.00 52.50 32.00 17.00 10.50 3.00 1-1/2
48.00 50.00 24 x 24 x 1
(4 per unit)
181 70.00 52.50 32.00 17.00 10.50 3.00 1-1/2
5.00
17.50 20.00 24.00
70.00
52.50
32.00
50.00
CONDENSER WATER OUT
CONDENSATE DRAIN
CONDENSER WATER IN
C
BA
ELECTRICAL
CONNECTIONS
44.25
22.00 22.00
44.25
12.12
28.00
2.00
17.50
BLOWER
MOTOR
ORIENTATION
OPTIONAL
BLOWER
ORIENTATION STANDARD
BLOWER
ORIENTATION
5.00
17.50 20.00 24.00
70.00
CONDENSER WATER OUT
CONDENSATE DRAIN
CONDENSER WATER IN
52.50
C
BA
32.00
ELECTRICAL
CONNECTIONS
BLOWER
MOTOR
ORIENTATION
32.00 BLOWER
MOTOR
ORIENTATION
ELECTRICAL
CONNECTIONS
A
B
C
70.00
17.50 28.00
2.00 12.12
22.00
E
D
44.25
STANDARD
BLOWER
ORIENTATION
OPTIONAL
BLOWER
ORIENTATION
FRONT SUPPLY
TOP SUPPLY
TOP SUPPLY REAR SUPPLY
REAR RETURN
FRONT RETURN
TOP SUPPLY
TOP SUPPLY
RETURN
AIR
RETURN
AIR

9
Fig. 6 — 50VQP210-360 Unit Dimensions
50VQP
UNIT SIZE HEIGHTa
NOTE(S):
a. All dimensions in inches unless otherwise noted. All dimensions within ± 0.125-in. Specifications subject to change without notice. 
Condensate connections are 1.25 in. FPT on sizes 210-360.
WIDTH DEPTHb
b. When WSHP Open controller is installed increase depth by 3.00 inches.
CONDENSER WATER CONNECTIONSc
c. Front of unit is side with water and electrical connections.
DUCT
FLANGE
FILTER
RACK REPLACEMENT FILTER SIZE
(NOMINAL)
ABC
Diameter
(FPT) DE
210 62.00 80.00 32.00 18.00 8.75 2.75 2 40.00 38.00 20 x 34-1/2 x 1
(4 per unit)
240 66.50 80.00 32.00 18.00 8.75 2.75 2 40.00 38.00
300 66.50 80.00 32.00 18.00 8.75 2.75 2 40.00 38.00
360 86.50 80.00 32.00 17.00 9.00 3.50 2 60.00 58.00 30 x 34-1/2 x 1
(4 per unit, size 360 only)
HEIGHT
7.00
28.00
10.00 34.00
34.00
4.50
28.00
2.00
17.50
C
BA
80.00
32.00
BLOWER MOTOR
ORIENTATION
CONDENSER WATER OUT
CONDENSATE DRAIN
CONDENSER WATER IN
ELECTRICAL
CONNECTIONS
D
E
6.0
9.0
20.0
24.0
14.0
22.0
34.00
34.00
4.50
22.00
BLOWER
MOTOR
ORIENTATION
17.50
2.00
28.00
10.00
28.00
7.00
6.00 9.00 20.00 24.00
14.00
E
DHEIGHT
C
BA
CONDENSER WATER OUT
CONDENSATE DRAIN
CONDENSER WATER IN
80.00
32.00
ELECTRICAL
CONNECTIONS
OPTIONAL BLOWER
ORIENTATION STANDARD BLOWER
ORIENTATION
OPTIONAL BLOWER
ORIENTATION
STANDARD BLOWER
ORIENTATION
FRONT RETURN
REAR RETURN
TOP SUPPLY REAR SUPPLY
FRONT SUPPLY TOP SUPPLY

10
50HQP072-150 UNITS SERVICE CLEARANCES
50HQP180-242 UNITS SERVICE CLEARANCES
50VQP072-181 UNITS SERVICE CLEARANCES
50VQP210-360 UNITS SERVICE CLEARANCES
Fig. 7 — Service Clearances
Compressor/Refrigerant Access
36" Minimum
Electrical/Compressor Access
36" Minimum
Compressors Blower
Motor
Blower
Air Coil
Electrical
Control
Box
Blower Access
24" Minimum (072, 096, 150)
36" Minimum (120)
Electrical/Compressor Access
36" Minimum
Blower Access
36" Minimum
Compressor/Refrigerant Access
36" Minimum
Air Coil
Compressors
Electrical
Control
Box
NOTE: The local electric codes may require 36" or more clearance at all electrical control boxes.
Blower
Motor
Blower
Motor
Blower Blower
*Blower Motor
Sheave/Pulley/Belt Access
18" Minimum
24" Optimum
Compressor Accesss and
Electrical/Control Access
36" Minimum
*Blower Wheel/Housing
18" Minimum
24" Optimum
Blower
Compressor
Front of Unit
Electrical
Control
Box
*Blower Wheel/Housing
18" Minimum
24" Optimum
*Blower Motor
Sheave/Pulley/Belt Access
18" Minimum
24" Optimum
*Blower Motor
Sheave/Pulley/Belt Access
18" Minimum
24" Optimum
Compressor Access and
Electrical/Control Access
36" Minimum
*Blower Wheel/Housing
18" Minimum
24" Optimum
Blower
Compressor Compressor
Electrical
Control
Box
Front of Unit
* Blower motor and blower housing access is required on BOTH SIDES of the unit.
Blower
Blower
Motor
Blower
Motor

11
Fig. 8 — 50VQP072-181 Units Take Apart Construction
50VQP072
50VQP096
50VQP120
50VQP151
50VQP181
Model
WIDTH (in.) HEIGHT (in.)
AB DAH
CCS
WEIGHTS (lb)
FILTER
RACK (in.)
42
42
42
42
42
42
22
22
22
22
22
33
52.50
52.50
33
33
45
45
396
468
511
640
700
204
264
242
330
360
50
50
AH — Air Handler Section
CS — Condensing Section
LEGEND

12
Fig. 9 — 50VQP210-360 Units Take Apart Construction
50VQP210
50VQP240
50VQP300
50VQP360
Model
WIDTH (in.) HEIGHT (in.)
ABDAH
CCS
WEIGHTS (in.)
FILTER
RACK (in.)
80
80
80
42
42
42
22
26
26
27
33
80
33
33
33
792
890
970
1155
408
500
460
595
62
AH — Air Handler Section
CS — Condensing Section
LEGEND

13
Step 2 — Check Unit
Upon receipt of shipment at the jobsite, carefully check the ship-
ment against the bill of lading. Make sure all units have been
received. Inspect the carton or crating of each unit, and inspect
each unit for damage.
INSPECT UNIT
To prepare the unit for installation, complete the procedures listed
below:
1. Verify that the correct unit has been received. Check the
unit capacity (tonnage), voltage, orientation, and
configuration.
2. Compare the electrical data on the unit nameplate with to ver-
ify the jobsite power feed (voltage, amperage, MCA) and
power protection (MOCP).
3. Verify that the unit is the correct model for the entering water
temperature of the job (standard or extended range).
4. Remove the unit packaging, keeping the unit attached to the
shipping pallet. Do not destroy packaging. Save for re-
installation on the unit if the unit will not be fully installed.
5. Open a unit access panel. Verify that the refrigerant tubing is
free of kinks or dents, and that it does not touch other unit
components.
6. Check the water piping and piping connections to make sure
they are free from defects, kinks, dents, and appear to be
water tight. Verify system operating water pressure.
7. Inspect the blower assembly. Verify that the blower has not
come loose during shipping. Verify clearance between the
blower wheel and the blower housing. Verify free blower
rotation.
8. Inspect all electrical connections. Be sure connections are
clean and tight at the terminals.
9. Check unit controls. If Complete C, or Deluxe D, verify field
provided thermostat or DDC control is available. If WSHP
Open, verify proper sensors have been provided and a com-
missioning interface will be available.
10. 50HQP Only - Locate the hanging bracket kit located in the
compressor compartment.
11. 50HQP Only - Horizontal units ordered with a VFD will be
provided with the VFD shipped loose for field installation.
The unit will ship with the VFD secured to the top of the unit
(see Fig. 1). The VFD is provided in a VFD enclosure along
with the VFD manufacturers installation manual. Inspect for
shipping damage prior to installation of the VFD. See Step 8
“Wire Field Power Supply” on page 18 for field wiring
instructions.
NOTE: Any work required to gain full access to the unit for repair
or service is not covered under the scope of the product warranty.
Step 3 — Locate Unit
• Locate the unit in an indoor area that allows easy removal
of the filter and access panels, and has enough room for
service personnel to perform maintenance or repair.
• Provide sufficient room to make fluid, electrical, and duct
connection(s).
• If the unit is located in a confined space such as a closet, pro-
visions must be made for return air to freely enter the space.
• Unit condensate drains are not internally trapped. Allow
room below the unit base for horizontal models for an ade-
quate condensate trap.
• Horizontal units include two condensate drain connections
to allow flexibility in unit sloping for proper drainage.
Only one connection needs to be used. The unused connec-
tion must be plugged.
• These units are not approved for outdoor installation; there-
fore, they must be installed inside the structure being condi-
tioned. Do not locate units in areas that are subject to freezing.
• Units must be installed in conditioned space that is not
subject to extremes of temperature or humidity to avoid
cabinet sweating and/or equipment damage.
• Do not use units for temporary heating, air conditioning or
ventilation during construction or remodeling, especially
when plastering, sanding or painting or when replacing
carpet or flooring. Dust and debris can clog the coil and
blower. Chemical vapors can lead to formicary corrosion
and damage the coil. Ensure adequate ventilation and de-
bris collection during construction or remodeling.
PROTECTION
Once the units are properly positioned on the jobsite, cover them
with either a shipping carton, vinyl film, or an equivalent protec-
tive covering. Cap open ends of pipes stored on the jobsite. This
precaution is especially important in areas where painting, plaster-
ing, or spraying of fireproof material, etc. is not yet complete. For-
eign material that accumulates within the units can prevent proper
start-up and require costly clean-up operations. Before installing
any of the system components, be sure to examine each pipe, fit-
ting, and valve, and remove any dirt or foreign material found in
or on these components.
TAKE APART CONSTRUCTION ASSEMBLY
Vertical units ordered with the take apart construction option will
be constructed in a manner that allows for field splitting of the unit
for ease of installation and rigging. The units are split into an air
coil/fan section and a water coil/compressor section.
These units will ship as an assembled single piece with pre-cut
interconnecting piping (including WSE piping if equipped) and
coiled up blower motor wiring to be installed in the field. Wiring
and interconnecting piping can be found in the air coil/fan section.
Each section will be factory charged with nitrogen. Refrigerant
must be provided and charged in the field per the unit's data plate
(See Table 1). See take apart construction dimensional drawing for
size and weights of the two sections.
DISASSEMBLY INSTRUCTION
The unit can be taken apart by removing the 4 brackets located on
the corner posts between the two sections. See Fig. 10.
ASSEMBLY INSTRUCTION
1. Locate the precut interconnecting piping and coiled blower
wiring in the air coil/fan section of the unit.
2. Connect the blower motor wiring labeled 1, 2, 3. For units
without a VFD the wiring to be connected in the field is the
wiring from the blower to be connected to the Blower Relay
(BR) terminals labeled T1, T2, T3. For units with a VFD the
wiring to be connected in the field is the wiring from the VFD
CAUTION
Failure to remove shipping brackets from spring-mounted
compressors will cause excessive noise and could cause
component failure due to added vibration.
IMPORTANT: Care must be taken to prevent the introduction of
dust, paint, debris, or chemicals into the unit, which can cause
damage to the unit, delay start-up, and may impact unit
longevity.

14
power terminal U1, V1, W1 to be connected to the TB2 ter-
minals. See Fig. 11 and 12 for further details.
3. Install internal refrigerant pipes and external water pipes (if
unit has water side economizer). These pre-cut components
are shipped loose internal to the unit.
4. Unit is shipped with pressurized nitrogen, after field installa-
tion is complete charge the unit according to the unit's data
plate. (See Table 1).
Fig. 10 — Take Apart Construction Assembly
Fig. 11 — Take Apart Construction Wiring
Connection, No VFD
Fig. 12 — Take Apart Construction Wiring
Connection, with VFD
Step 4 — Mount the Unit
MOUNTING VERTICAL UNITS
Vertical units are available in front or rear return configurations.
Vertical units should be mounted level on a vibration absorbing
pad slightly larger than the base to minimize vibration
transmission to the building structure. It is not necessary to anchor
the unit to the floor. See Fig. 13.
All 50VQP units should be vibration isolated according to the de-
sign engineers’ specifications.
Fig. 13 — Vertical Unit on Vibration Pad
CAUTION
Remove all shipping blocks under blower housing. Loosen
compressor mounting bolts. Failure to do so could result in
equipment damage.
Vibration
Pad
Full Size

15
MOUNTING HORIZONTAL UNITS
While horizontal units may be installed on any level surface strong
enough to hold their weight, they are typically suspended above a
ceiling by threaded rods. The rods are usually attached to the unit
corners. The rods must be securely anchored to the ceiling. All
50HQP units include an integral angle iron frame with mounting
holes present. (See unit horizontal detail drawing.) Horizontal
units installed above the ceiling must conform to all local codes.
An auxiliary drain pan if required by code, should be at least four
inches larger than the bottom of the heat pump. Plumbing connect-
ed to the heat pump must not come in direct contact with joists,
trusses, walls, etc.
Some applications require an attic floor installation of the horizon-
tal unit. In this case the unit should be set in a full size secondary
drain pan on top of a vibration absorbing mesh. The secondary
drain pan prevents possible condensate overflow or water leakage
damage to the ceiling. The secondary drain pan is usually placed
on a plywood base isolated from the ceiling joists by additional
layers of vibration absorbing mesh. In both cases, a 3/4-in. drain
connected to this secondary pan should be run to an eave at a loca-
tion that will be noticeable. If the unit is located in a crawl space,
the bottom of the unit must be at least 4 in. above grade to prevent
flooding of the electrical parts due to heavy rains.
Step 5 — Check Duct System
A supply air outlet collar and return air duct flange are provided
on all units to facilitate duct connections. Fold the duct flange out-
wards along the perforated line. Refer to Fig. 2-6 for physical di-
mensions of the collar and flange.
NOTE: All dual fan units (50HQP 120 and 180-242, 50VQP 210-
360) must use a “pair of pants” duct configuration as shown in
Fig. 14. Failure to follow these guidelines can result in fan system
failure.
Fig. 14 — Typical Fan Discharge Connections for
Multiple Fan Units
Refer to ASHRAE (American Society of Heating, Refrigerating
and Air-Conditioning Engineers) standards for the recommended
duct connection to units with 2 fans. An adequate straight length
of ducting from the unit should be allowed before elbows are in-
stalled. Elbows should turn in the direction of fan rotation, if pos-
sible. Abrupt turns will generate air turbulence and excessive
noise. Turning vanes should be used in all short radius bends. En-
sure that ducting does not obstruct access to the unit for routine
servicing.
A flexible connector is recommended for supply and return air
connections on metal duct systems. All metal ducting should be
insulated with a minimum of one inch duct insulation to avoid
heat loss or gain and prevent condensate forming during the cool-
ing operation. Application of the unit to uninsulated duct work is
not recommended as the unit's performance will be adversely af-
fected. Do not connect discharge ducts directly to the blower out-
let. The factory provided air filter must be removed when using a
filter back return air grille.The factory filter should be left in place
on a free return system. If the unit will be installed in a new
installation with new ductwork, the installation should be designed
using current ASHRAE (American Society of Heating, Refriger-
ating, and Air-Conditioning Engineers) procedures for duct sizing.
If the unit will be connected to an existing duct system, a check
should be made to assure that the duct system has the capacity to
handle the air required for the unit application. If the duct system
is too small, larger ductwork must be installed. Be certain to check
for existing leaks and repair.
The duct system and all diffusers should be sized to handle the de-
signed airflow quietly. To maximize sound attenuation of the unit
blower, the supply and return air plenums should be insulated.
There should be no direct straight air path through the return-air
grille into the heat pump. The return air inlet to the heat pump
must have at least one 90 degree turn away from the space return
air grille. If air noise or excessive airflow are a problem, the blow-
er speed can be changed to a lower speed to reduce airflow.
Step 6 — Install Condensate Drain
A drain line must be connected to the heat pump and pitched away
from the unit a minimum of 1/8-in. per foot to allow the conden-
sate to flow away from the unit. 50VQP vertical units include one
condensate drain. 50HQP horizontal units include two condensate
drain connections to allow for field pitching based on installation
requirements. Only one condensate drain connection should be
used. Cap and seal the unused drain connection.
Units with waterside economizer include an additional condensate
pan and drain as part of the economizer assembly. This drain must
also be piped to a condensate line following the guidance above.
NOTE: the waterside economizer condensate pan is not protected
by a condensate overflow switch from the factory.
This connection must be in conformance with local plumbing
codes. A trap must be installed in the condensate line to ensure
free condensate flow. (Units are not internally trapped.) A vertical
air vent is sometimes required to avoid air pockets. (See Fig. 15.)
The length of the trap depends on the amount of positive or nega-
tive pressure on the drain pan.
A
B
a50-8357.eps
NOTE: A = 1-1/2 to 2-1/2B
CAUTION
Verify condensate switch is installed in the lowest part of the
drain pan, based on unit pitch. Condensate switch may need to
be relocated from factory position.

16
Fig. 15 — Condensate Trapping
A second trap must not be included. The horizontal unit should be
pitched approximately 1/4-in. towards the drain in both directions,
to facilitate condensate removal. (See Fig. 16.)
Fig. 16 — Sloped Horizontal Unit Installation
Step 7 — Pipe Connections
Supply and return piping must be as large as the unit connections
on the heat pump (larger on long runs). Never use flexible hoses of
a smaller inside diameter than that of the water connections on the
unit. Units are supplied with either a copper or optional
cupronickel coaxial water coil. Copper is adequate for ground wa-
ter that is not high in mineral content. Should your well driller ex-
press concern regarding the quality of the well water available or
should any known hazards exist in your area, Carrier recommends
proper testing to assure the well water quality is suitable for use
with water source equipment. In conditions anticipating moderate
scale formation or in brackish water a cupronickel heat exchanger
is recommended.
Both the supply and discharge water lines will sweat if subjected
to low water temperature. These lines should be insulated to pre-
vent damage from condensation.
All manual flow valves used in the system must be ball valves.
Globe and gate valves must not be used due to high pressure drop
and poor throttling characteristics. Never exceed the recommend-
ed water flow rates. Serious damage or erosion of the water to re-
frigerant heat exchanger could occur.
Always check carefully for water leaks and repair appropriately.
Units are equipped with female pipe thread fittings. Consult the
specification sheets for sizes. Teflon1tape sealer should be used
when connecting water piping connections to the units to insure
against leaks and possible heat exchanger fouling. Do not
overtighten the connections. Flexible hoses should be used be-
tween the unit and the rigid system to avoid possible vibration.
Ball valves should be installed in the supply and return lines for
unit isolation and unit water flow balancing.
Pressure/temperature ports are recommended in both the supply
and return lines for system flow balancing. The water flow can be
accurately set by measuring the water-to-refrigerant heat exchang-
ers water side pressure drop. See the unit specification sheets for
the water flow and pressure drop information.
WATER QUALITY GUIDELINES
In all applications, the quality of the water circulated through the
heat exchanger must fall within the ranges listed in Table 2, Water
Quality Guidelines. Consult a local water treatment firm, indepen-
dent testing facility, or local water authority for specific recom-
mendations to maintain water quality within the published limits.
UNITS WITH WATERSIDE ECONOMIZER OR
BOILERLESS HEAT CONTROL
Units with Complete C or Deluxe D controls and waterside econo-
mizer or units with Boilerless Heat Control (all Deluxe D) include
an aquastat with remote sensing bulb that must be field-installed
on the incoming water piping. The remote sensing bulb must be
installed on a straight section of uninsulated pipe that provides a
good measurement of the entering water temperature. It is recom-
mended to insulate the sensing bulb after installation for better
water temperature sensing.
WELL WATER SYSTEMS (50°F EWT [ENTERING
WATER TEMPERATURE] MINIMUM)
When a water well is used exclusively for supplying water to the
heat pump, the pump should operate only when the heat pump
operates. A 24 volt, double-pole single-throw contactor can be
used to operate the well pump with the heat pump.
When two or more units are supplied from one well, the pump can
be wired to operate independently from either unit. Two 24-volt
double-pole single-throw relays wired in parallel are required. An
upsized VA transformer may be required in either case.
The discharge water from the heat pump is not contaminated in
any manner and can be disposed of in various ways depending on
local codes (e.g., discharge well, dry well, storm sewer, drain field,
stream, pond, etc.).
COOLING TOWER/BOILER APPLICATION
To ensure adequate cooling and heating performance, the cooling
tower and boiler water loop temperature should be maintained be-
tween 50°F and 80°F in the heating mode and 70°F and 110°F in
the cooling mode. In the cooling mode, heat is rejected from the
unit into the water loop. A cooling tower provides evaporative
cooling to the loop fluid, thus maintaining a constant supply tem-
perature to the unit. When utilizing an open cooling tower, chemi-
cal water treatment is mandatory to ensure the water is free of cor-
rosive materials.
A secondary heat exchanger (plate frame between the unit and the
open cooling tower) may also be used. It is imperative that all air
is eliminated from the closed loop side of the heat exchanger to
prevent condenser fouling. In the heating mode, heat is absorbed
from the water loop to the unit. A boiler can be utilized to maintain
the loop within the proper temperature range.
No unit should be connected to the supply or return piping until
the water system has been completely cleaned and flushed to re-
move dirt, piping chips or other foreign material. Supply and re-
turn hoses should be connected together during this process to en-
sure the entire system is properly flushed. After the cleaning and
flushing has taken place the unit may be connected to the water
loop and should have all valves wide open. See Fig. 17.
1. Third-party trademarks and logos are the property of their respective
owners.
Condensate Drain
Connection
Vent (Optional)
Slope Down
Min. 1/8"
Per Foot
Trap Down
2" Min.
Elevation Line
When Mounted Level
1/4"
CAUTION
Water piping exposed to extreme, low ambient temperatures is
subject to freezing.

17
LEGEND
Table 2 — Water Quality Guidelines
CONDITION HX
MATERIALa
NOTE(S):
a. Heat exchanger materials considered are copper, cupronickel, 304 SS (stainless steel), 316 SS, titanium.
CLOSED
RECIRCULATINGb
b. Closed recirculating system is identified by a closed pressurized piping system.
OPEN LOOP AND RECIRCULATING WELLc
c. Recirculating open wells should observe the open recirculating design considerations.
Scaling Potential — Primary Measurement
Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below.
pH/Calcium Hardness Method All N/A pH < 7.5 and Ca Hardness, <100 ppm
Index Limits for Probable Scaling Situations (Operation outside these limits is not recommended.)
Scaling indexes should be calculated at 150°F for direct use and HWG applications, and at 90°F for indirect HX use. A monitoring plan should be implemented.
Ryznar Stability Index All N/A 6.0 - 7.5
If >7.5 minimize steel pipe use.
Langelier Saturation Index
All N/A
–0.5 to +0.5
If <–0.5 minimize steel pipe use.
Based upon 150°F HWG and direct well, 85°F indirect well HX.
Iron Fouling
Iron Fe2+ (Ferrous)
(Bacterial Iron Potential) All N/A <0.2 ppm (Ferrous)
If Fe2+ (ferrous) >0.2 ppm with pH 6 - 8, O2<5 ppm check for iron bacteria.
Iron Fouling All N/A <0.5 ppm of Oxygen
Above this level deposition will occur.
Corrosion Preventiond
d. If the concentration of these corrosives exceeds the maximum allowable level, then the potential for serious corrosion problems exists. Sulfides in the water quickly oxidize
when exposed to air, 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 can 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 registers a pH of 7.0. To convert ppm to grains per gallon, divide by 17. Hardness in mg/l is equivalent to ppm.
pH All 6 - 8.5
Monitor/treat as needed.
6 - 8.5
Minimize steel pipe below 7 and no open tanks with pH <8.
Hydrogen Sulfide (H2S)
All N/A
<0.5 ppm
At H2S>0.2 ppm, avoid use of copper and cupronickel piping or HXs.
Rotten egg smell appears at 0.5 ppm level.
Copper alloy (bronze or brass) cast components are okay to <0.5 ppm.
Ammonia Ion as Hydroxide,
Chloride, Nitrate and Sulfate
Compounds
All N/A
<0.5 ppm
Maximum Chloride Levels Maximum allowable at maximum water temperature.
50°F (10°C) 75°F (24°C) 100°F (38°C)
Copper N/A <20 ppm NR NR
Cupronickel N/A <150 ppm NR NR
304 SS N/A <400 ppm <250 ppm <150 ppm
316 SS N/A <1000 ppm <550 ppm <375 ppm
Titanium N/A >1000 ppm >550 ppm >375 ppm
Erosion and Clogging
Particulate Size and Erosion
All
<10 ppm of particles and a
maximum velocity of 6 fps.
Filtered for maximum
800 micron size.
<10 ppm (<1 ppm “sandfree” for reinjection) of particles and a maximum
velocity of 6 fps. Filtered for maximum 800 micron size. Any particulate that
is not removed can potentially clog components.
Brackish
All N/A
Use cupronickel heat exchanger when concentrations of calcium or sodium
chloride are greater than 125 ppm are present. (Seawater is approximately
25,000 ppm.)
HWG — Hot Water Generator
HX — Heat Exchanger
N/A —Design Limits Not Applicable Considering Recirculating
Potable Water
NR — Application Not Recommended
SS — Stainless Steel

18
Fig. 17 — Cooling Tower/Boiler Application
EARTH COUPLED SYSTEMS
Operation of a unit on a closed loop application requires the ex-
tended range option.
NOTE: Closed loop and pond applications require specialized de-
sign knowledge. No attempt at these installations should be made
unless the dealer has received specialized training.
Utilizing Ground Loop Pumping Package (GLP) makes the instal-
lation easy. Anti-freeze solutions must be utilized when low evap-
orating conditions are expected to occur. Refer to the installation
manuals for more specific instructions.
Step 8 — Wire Field Power Supply
See Tables 3-6 for electrical data.
See Fig. 2-5 for cabinet electrical wiring points. See typical wir-
ing diagrams starting on page 21. Unit will ship with wiring dia-
gram affixed to the inside of the unit control panel.
HIGH VOLTAGE
All field-installed wiring must comply with the National Electric
Code as well as all applicable local codes. Refer to the unit electri-
cal data on the unit nameplate for wire and branch circuit protec-
tion sizing. Supply power voltage and phasing should match the
required voltage and phasing shown on the unit nameplate. Oper-
ating the unit below the minimum voltage, above the maximum
voltage or with incorrect phasing can result in poor system perfor-
mance or damage to the heat pump. All field wiring should be in-
stalled by qualified and trained personnel. Refer to the unit wiring
diagram for field connection requirements.
Power wiring to the heat pump should be enclosed in flexible
conduit to minimize the transmission of vibration from the unit
cabinet to the building.
For heat pumps with unit mounted disconnect switches, field pow-
er should be connected to the marked terminals on the disconnect
switch. For heat pumps without unit-mounted disconnect switches
(except units with dual power supply), power is connected to the
line (L) side of the compressor contactor and the ground lug in the
unit electrical box.
CONTROL TRANSFORMER SETTING FOR 208V UNITS
As factory built, all 208/230-v units are wired for 230-v operation.
For job sites with a 208-v power supply, the primary leads on the
unit transformer will need to be changed from 230-v to 208-v.
Refer to the unit wiring diagram for details.

19
50HQP WITH SUPPLY FAN VFD
Units with the SAVTM or single speed VFD option include a VFD
that ships loose for field installation. See Fig. 21 for field power
wiring for VFD. Use the following guidance for VFD installation:
NOTE: Installation must adhere to local codes and requirements.
1. Remove the VFD from the unit shipping storage location.
See Fig. 1.
2. Remove the VFD Box cover and locate the ABB VFD
installation manual.
3. Inspect the VFD and VFD Fuse Block. Ensure the fuses
are secured inside the VFD box. See Fig. 18 and 19.
4. Mount the VFD box using the mounting brackets to a suit-
able remote mounting location. See Fig. 20.
5. Disconnect unit power and remove the compressor and
electrical control box accesses panel on the unit.
See Fig. 21.
6. Make field wiring connections between terminal block 3
(TB3) (located in the unit electrical control box) and VFD
fuse block (FB1) (located in the VFD enclosure).
7. Make field wiring connections between terminals (U1, V1,
W1). Both located within VFD enclosure.
8. Make field wiring connections between VFD output termi-
nals (U2, V2, W2) (located in VFD enclosure) and
terminal block 4 (TB4) (located in the unit electrical con-
trol box).
NOTE: All remote VFD field wiring must be installed per local
codes and requirements. See Fig. 22-34 for typical wiring
diagrams.
Fig. 18 — Remote VFD Enclosure Components,
50HQP Units
Fig. 19 — Remote VFD Enclosure Mounting,
50HQP Units
WARNING
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.
CAUTION
All power connections must be properly torqued to avoid the
risk of overheating.
CAUTION
The power supply ground wire should never be used as a
neutral wire.

20
Fig. 20 — Electrical Control Box Location, 50HQP Units
Fig. 21 — VFD Input and Output Power Connections, 50HQP Units
ELECTRICAL
CONNECTIONS
CONDENSAT E
DRAIN ELECTRICAL BOX
CONTROLS,
COMPRESSORS
ACCESS
COMPRESSORS,
REFRIGERATION
COMPONENTS
ACCESS