Mars Comfort-aire Century Compact HBH Series Owner's manual

97B0016N10
Issue Date: January 24, 2023
Installation, Operation &
Maintenance
Compact (HBH/HBV) Series
HBH-HBV 006-60
60Hz - HFC-410A

Installation, Operation, Maintenance
2
Installation, Operation & Maintenance - HBH/HBV Compact Series
Table of Contents
Model Nomenclature – General Overview 3
General Information 4
Unit Physical Data 6
Horizontal Installation 7
Field Conversion of Air Discharge 9
Horizontal Installation 10
Vertical Installation 11
Piping Installation 13
Water-Loop Heat Pump Applications 14
Ground-Loop Heat Pump Applications 15
Ground-Water Heat Pump Applications 17
Water Quality Standards 19
HB - Horizontal – Dimensional Data 23
HBH with WSE – Dimensional Data 25
HB - Horizontal Service Access 27
HB - Vertical Upow – Dimensional Data 28
HBV with WSE – Dimensional Data 30
HB - Vertical Service Access 32
Electrical Data – PSC 33
Electrical Data – ECM 34
Electrical – Line Voltage 35
Eletctical – Power & Low Voltage Wiring 36
Electrical – Low Voltage Wiring 37
Electrical – Thermostat Wiring 38
Blower Performance Data – HB006 39
Blower Performance Data – HB009 39
Blower Performance Data – HB012 39
Blower Performance Data – HB015 40
Blower Performance Data – HB018 41
Blower Performance Data – HB024 42
Blower Performance Data – HB030 42
Blower Performance Data – HB036 43
Blower Performance Data – HB041 43
Blower Performance Data – HB042 44
Blower Performance Data – HB048 45
Blower Performance Data – HB060 46
Constant Volume ECM Control 47
Wiring Diagram Matrix 48
Controls - CXM2 and DXM2.5 49
Unit Starting and Operating Conditions 50
Piping System Cleaning and Flushing 51
HB with Waterside Economizer Option 52
Unit and System Checkout 54
Unit Start-Up Procedure 55
Unit Operating Conditions 57
Preventive Maintenance 62
Functional Troubleshooting 63
Performance Troubleshooting 64
Start-Up Log Sheet 65
Functional Troubleshooting 66
Warranty 67
Revision History 68

Installation, Operation, Maintenance 3
Installation, Operation & Maintenance - HBH/HBV Compact Series
Model Nomenclature – General Overview
A0 2 4 C1 3 0 C P T
45 6 7
8
91011121314
006
009
012
015
018
024
030
036
041(HBV only)
042
048
060
Unit Size
Return Air Flow Configuration
Voltage
Controls
A = Current Revision
Revision Level
Heat Exchanger Options
1 = Commercial Extended Range
2 = Commercial Extended Range w/UltraQuiet
3 = Commercial Standard Range
4 = Commercial Standard Range w/UltraQuiet
C = Commercial Standard Range, Cooling Only, vertical units
Cabinet
HB
1 2
HB = Heat Controller Compact
Series
V
3
V = Vertical Up
H = Horizontal
Configuration
P = Left Return
C = Right Return
S = Left Return, S.S Drain Pan
T = Right Return, S.S Drain Pan
Q = Front Return, S.S Drain Pan
Supply Air Flow &
Motor Configuration
Valve
0 = None
3 = Discharge Pressure Water Regulating Valve (Cooling Only)
1 = 208-230/60/1
3 = 208-230/60/3
4 = 460/60/3
5 = 575/60/3
8 = 265/60/1
C = Copper Water Coil, Non Coated Air Coil
N = Cupro-Nickael Water Coil, Non Coated Air Coil
A = Copper Water Coil, Coated Air Coil
J = Cupro-Nickel Water Coil, Coated Air Coil
1 = Copper Water Coil/Tin-Plates Air Coil/E-Coated Water Side
Economizer Coil
2 = Copper Water Coil/Water Side Economizer
3 = Cupro-Nickel Water Coil/Tin-Plates Air Coil/E-Coated Water
Side Economizer
4 = Cupro-Nickel Water Coil/Water Side Economizer
Supply Configuration Motor
T Top HBV PSC
B Back HBH PSC
S Straight HBH PSC
V Top HBV PSC Hi Static
Y Back HBH PSC Hi Static
Z Straight HBH PSC Hi Static
K Top HBV ECM
P Back HBH ECM
W Straight HBH ECM
C = CXM2
D = DXM2.5
N = CXM2 w/MPC
P= DXM2.5 w/MPC
1. Not available on sizes 006, 009, 012.
2. If digit 14 is K, P, or W then digit 9 must be options D, M, or P.
3. Not available in 575v voltage.
4. If digit 12 is 1, 2, 3, or 4 then digit 9 must be C, D, M, or P.
5. If digit 12 is 1, 2, 3, or 4 then digit 13 cannot be P, C, or Q.
6. Not available on size 041.
7. Not available in sizes 006, 036, 041, 042, 048, or 060.
Front return units are only available with stainless steel drain pans.
[Notes]
[1,6]
[1,6]
[1,6]
[1,2,3,6]
[1,2,3,6]
[1,2,3,6]
[4,5,6]
[4,5,6]
[4,5,6]
[4,5,6]
[7]
Note: Above model nomenclature is a general reference. Not all congurations are available on all models. Consult selection software for detailed information.

Installation, Operation, Maintenance
4
Installation, Operation & Maintenance - HBH/HBV Compact Series
General Information
Safety
Warnings, cautions, and notices appear throughout this
manual. Read these items carefully before attempting any
installation, service, or troubleshooting of the equipment.
DANGER: Indicates an immediate hazardous situation,
which if not avoided will result in death or serious injury.
DANGER labels on unit access panels must be observed.
WARNING: Indicates a potentially hazardous situation,
which if not avoided could result in death or serious injury.
CAUTION: Indicates a potentially hazardous situation or
an unsafe practice, which if not avoided could result in
minor or moderate injury or product or property damage.
NOTICE: Notication of installation, operation, or
maintenance information, which is important, but which is
not hazard-related.
Inspection - Upon receipt of the equipment, carefully
check the shipment against the bill of lading. Make sure
all units have been received. Inspect the packaging of
each unit, and inspect each unit for damage. Ensure that
the carrier makes proper notation of any shortages or
damage on all copies of the freight bill and completes a
common carrier inspection report. Concealed damage
not discovered during unloading must be reported to the
carrier within 15 days of receipt of shipment. If not led
within 15 days, the freight company can deny the claim
without recourse.
Note: It is the responsibility of the purchaser to le
all necessary claims with the carrier. Notify your
equipment supplier of all damage within fteen (15)
days of shipment.
Storage - Equipment should be stored in its original
packaging in a clean, dry area. Store units in an upright
position at all times. Stack units a maximum of 3 units high.
Unit Protection - Cover units on the job site with
either the original packaging or an equivalent protective
covering. Cap the open ends of pipes stored on the
job site. In areas where painting, plastering, and/or
spraying has not been completed, all due precautions
must be taken to avoid physical damage to the units and
contamination by foreign material. Physical damage and
contamination may prevent proper start-up and may
result in costly equipment clean-up.
⚠ WARNING! ⚠
⚠ WARNING! ⚠
⚠ CAUTION! ⚠
⚠ WARNING! ⚠
WARNING! To avoid the release of refrigerant into the
atmosphere, the refrigerant circuit of this unit must be
serviced only by technicians who meet local, state, and
federal prociency requirements.
CAUTION! To avoid equipment damage, DO NOT use
these units as a source of heating or cooling during the
construction process. The mechanical components and lters
can quickly become clogged with construction dirt and debris,
which may cause system damage and void product warranty.
WARNING! The Application and Service Manual should be
read and understood before attempting to service refrigerant
circuits with HFC-410A.
WARNING! The installation of water-source heat pumps 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.
⚠ WARNING! ⚠
WARNING! All refrigerant discharged from this unit must
be recovered WITHOUT EXCEPTION. Technicians must
follow industry accepted guidelines and all local, state, and
federal statutes for the recovery and disposal of refrigerants.
If a compressor is removed from this unit, refrigerant circuit
oil will remain in the compressor. To avoid leakage of
compressor oil, refrigerant lines of the compressor must be
sealed after it is removed.

Installation, Operation, Maintenance 5
Installation, Operation & Maintenance - HBH/HBV Compact Series
General Information, Cont’d.
Examine all pipes, ttings, and valves before installing
any of the system components. Remove any dirt or debris
found in or on these components.
Pre-Installation - Installation, Operation, and
Maintenance instructions are provided with each
unit. Horizontal equipment is designed for installation
above false ceiling or in a ceiling plenum. Other unit
congurations are typically installed in a mechanical room.
The installation site chosen should include adequate
service clearance around the unit. Before unit start-up,
read all manuals and become familiar with the unit and its
operation. Thoroughly check the system before operation.
Prepare units for installation as follows:
1. Compare the electrical data on the unit nameplate with
ordering and shipping information to verify that the
correct unit has been shipped.
2. Keep the cabinet covered with the original packaging
until installation is complete and all plastering, painting,
etc. is nished.
3. Verify refrigerant tubing is free of kinks or dents and
that it does not touch other unit components.
4. Inspect all electrical connections. Connections must be
clean and tight at the terminals.
5. Remove any blower support packaging (water-to-air
units only).
6. Some airow patterns are eld convertible (horizontal
units only). Locate the airow conversion section of
this IOM.
7. Locate and verify any hot water generator (HWG),
hanger, or other accessory kit located in the
compressor section or blower section.
⚠ CAUTION! ⚠
⚠ CAUTION! ⚠
⚠ CAUTION! ⚠
CAUTION! All three phase scroll compressors must have
direction of rotation veried at start-up. Verication is
achieved by checking compressor Amp draw. Amp draw
will be substantially lower compared to nameplate values.
Additionally, reverse rotation results in an elevated sound
level compared to correct rotation. Reverse rotation will result
in compressor internal overload trip within several minutes.
Verify compressor type before proceeding.
CAUTION! 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
signicantly reduce performance, reliability, and service life.
Always move and store units in an upright position. Tilting
units on their sides will cause equipment damage.
CAUTION! CUT HAZARD - Failure to follow this caution may
result in personal injury. Sheet metal parts may have sharp
edges or burrs. Use care and wear appropriate protective
clothing, safety glasses and gloves when handling parts and
servicing heat pumps.
WARNING! This product can expose you to chemicals
including formaldehyde, which is known to the state of
California to cause cancer. For more information, go to
www.P65Warnings.ca.gov.
⚠ WARNING! ⚠
⚠ WARNING! ⚠
WARNING! Polyolester Oil, commonly known as POE oil, is a
synthetic oil used in many refrigeration systems including those
with HFC-410A refrigerant. POE oil, if it ever comes in contact
with the polymer drain pan, may cause the drain pan to leak.
The polymer drain pan should never come in contact with POE
oil as system failures and property damage may result.

Installation, Operation, Maintenance
6
Installation, Operation & Maintenance - HBH/HBV Compact Series
Unit Physical Data
HB-Series (60 Hz)
HB Series 006 009 012 015 018 024 030 036 041 042 048 060
Compressor (1 Each) Rotary Scroll
Factory Charge
HFC-410A (oz) 19 20 23 35 43 40 48 50 70 70 74 82
ECM Fan Motor & Blower
Blower Wheel Size
(Dia x w) N/A N/A N/A 9x7 9x7 9x7 9x7 9x8 N/A 9x8 10x10 12x10
PSC Fan Motor & 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 PSC/3
Blower Wheel Size
(Dia x w) 5x5 5x5 6x5 8x7 8x7 9x7 9x7 9x8 9x8 9x8 10x10 12x10
Water Connection Size
FPT 1/2” 1/2” 1/2” 1/2" 1/2" 3/4" 3/4" 3/4" 3/4” 3/4" 1" 1"
Coax Volume (gallons) 0.123 0.143 0.167 0.286 0.450 0.286 0.323 0.323 0.890 0.890 0.738 0.939
Vertical
Air Coil Dimensions
(H x W) 10x15 10x15 10x15 20x17.25 20x17.25 20x17.25 20x17.25 24x21.75 20x17.25 24x21.76 24x28.25 24x28.25
Filter Standard - 1"
Throwaway 10x18 10x18 10x18 20x20 20x20 20x20 20x20 24x24 20x20 24x24 1-14x24, 1-18x24
1-14x24,
1-18x24
Weight - Operating (lbs.) 103 105 114 153 158 189 197 203 210 218 263 278
Weight - Packaged (lbs.) 113 115 124 158 163 194 202 209 217 224 270 285
Horizontal
Air Coil Dimensions
(H x W) 10x15 10x15 10x15 16x22 16x22 16x22 16x22 20x25 N/A 20x25 20x35 20x35
Filter Standard - 1"
Throwaway 10x18 10x18 10x18 16x25 16x25 18x25
18x25 20x28 or
2-20x14
N/A
20x28 or
2-20x14
1-20x24,
1-20x14
1-20x24,
1-20x14
Weight - Operating (lbs.) 103 105 114 153 158 174 182 203 N/A 218 263 278
Weight - Packaged (lbs.) 113 115 124 158 163 179 187 209 N/A 224 270 285
Notes:
All units have TXV expansion device, and 1/2” & 3/4” electrical knockouts.
FPT = Female Pipe Thread
Condensate Drain Connection is rubber coupling that couples to ¾” schedule 40/80 PVC.
575 volt fan motors are two speed.
Unit Maximum Water Working Pressure Max Pressure PSIG
[kPa]
Base Unit 500 [3447]
WSE Option 300 [2068]

Installation, Operation, Maintenance 7
Installation, Operation & Maintenance - HBH/HBV Compact Series
Horizontal Installation
Mounting Horizontal Units
Horizontal units have 4 hanger brackets partially attached
at the factory, one at each corner. Enclosed within the unit
there is a hanger kit hardware bag containing vibration
isolation grommets, washers, screws and a hanger
installation instruction page. One additional screw from
the hardware bag must be added to each hanger bracket
before unit installation. Tighten each screw to 75 in-lbs
(8.5 Nm). See Figure 1. Refer to the hanger installation
instruction page contained in the hardware bag for details
of nal hanger bracket attachment and unit suspension.
See Figure 1a.
Use four (4) eld supplied threaded rods and factory
provided vibration isolators to suspend the unit. Safely
lift the unit into position supporting the bottom of the
unit. Ensure the top of the unit is not in contact with any
external objects. Connect the top end of the 4 all-thread
rods, slide rods through the brackets and grommet then
assemble washers and double nuts at each rod. Ensure
that the unit is approximately level and that the threaded
rod extends past the nuts.
Pitch the unit toward the drain as shown in Figure 2 to
improve the condensate drainage. On small units (less
than 2.5 tons/8.8kW) ensure that unit pitch does not
cause condensate leaks inside the cabinet.
Horizontal Unit Location
Units are not designed for outdoor installation. Locate
the unit in an INDOOR area that allows enough space for
service personnel to perform typical maintenance or repairs
without removing unit from the ceiling. Horizontal units
are typically installed above a false ceiling or in a ceiling
plenum. Never install units in areas subject to freezing or
where humidity levels could cause cabinet condensation
(such as unconditioned spaces subject to 100% outside
air). Consideration should be given to access for easy
removal of the lter and access panels. Provide sufcient
room to make water, electrical, and duct connection(s).
If the unit is located in a conned space, such as a closet,
provisions must be made for return air to freely enter the
space by means of a louvered door, etc. Any access panel
screws that would be difcult to remove after the unit is
installed should be removed prior to setting the unit. Refer
to Figure 3 for an illustration of a typical installation. Refer
to unit submittal data or engineering design guide for
dimensional data.
Conform to the following guidelines when selecting
unit location:
1. Provide a hinged access door in concealed-spline or
plaster ceilings. Provide removable ceiling tiles in T-bar
or lay-in ceilings. Refer to horizontal unit dimensions
for specic series and model in unit submittal data.
Size the access opening to accommodate the service
technician during the removal or replacement of the
compressor, control, or blower assembly.
2. Provide access to hanger brackets, water valves
and ttings. Provide screwdriver clearance to access
panels, discharge collars and all electrical connections.
3. DO NOT obstruct the space beneath the unit with
piping, electrical cables and other items that prohibit
future removal of components or the unit itself.
4. Use a manual portable jack/lift to lift and support the
weight of the unit during installation and servicing.
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.
Figure 1: Hanger Bracket
VIEW WATER CONNECTION END
FULLY ASSEMBLED
(Unit pictured for hanger bracket reference)
(Water hardware may vary per unit model)
ADD
BEFORE
HANGING
Figure 1a:
SCALE 1.000
DETAIL A

Installation, Operation, Maintenance
8
Installation, Operation & Maintenance - HBH/HBV Compact Series
Horizontal Installation, Cont’d.
Figure 3: Typical Horizontal Unit Installation
HORIZONTAL INSTALLATION
(by others)
(by others)
Cableado
del termostato
Válvula compensadora opcional
Salida de agua
Entrada de agua
Válvula invertida opcional para
control de baja presión de agua
(puede montarse en forma interna)
Válvula a bola con tapón
P/T integrado opcional
Manguera trenzada de
acero inoxidable con accesorio
giratorio en “J”
Circuito
de edificación
Disyuntor de
energía de la unidad
(fabricado por terceros)
Alimentación
de energía de
la unidad
Conducto de alimentación
aislado con un codo (mínimo)
de 90 grados para reducir el
ruido del aire
Retorno de
aire
Aire de alimentación
Cableado de
alimentación
de energía
Varillas Roscadas de 3/8"
(fabricadas por terceros)
Colgador
de la unidad
Thermostat
Wiring
Water In
Water Out
Optional Balancing Valve
Ball Valve with optional
integral P/T plug
Stainless steel braid hose
with integral "J" swivel
Building
Loop
Unit Power
Disconnect
Power Wiring
Insulated supply duct with
at least one 90 deg elbow
to reduce air noise
Return Air
Supply Air
Unit Hanger
3/8" [10mm] threaded rods
Unit Power
Flexible Duct
Connector
Figure 3: Typical Horizontal Unit Installation
Optional Low Pressure Drop Water
Control Valve
Figure 2: Horizontal Unit Pitch
1/4” (6.4mm) pitch
toward drain for drainage
Drain Connection
Air Coil - To obtain maximum performance, the air coil
should be cleaned before start-up. A 10% solution of
dishwasher detergent and water is recommended for
both sides of the coil. A thorough water rinse should
follow. UV based anti-bacterial systems may damage
e-coated air coils.
Notice! Installation Note - Ducted Return: Many
horizontal WSHPs are installed in a return air ceiling
plenum application (above ceiling). Vertical WSHPs
are commonly installed in a mechanical room with free
return (e.g. louvered door). Therefore, lter rails are the
industry standard and are included on our commercial
heat pumps for the purposes of holding the lter only. For
ducted return applications, the lter rail must be removed
and replaced with a duct ange or lter frame. Canvas
or exible connectors should also be used to minimize
vibration between the unit and ductwork.

Installation, Operation, Maintenance 9
Installation, Operation & Maintenance - HBH/HBV Compact Series
Horizontal Installation – Field Conversion of Air Discharge
Overview - Horizontal units can be eld converted
between side (straight) and back (end) discharge using
the instructions below.
NOTE: It is not possible to eld convert return air
between left or right return models due to the necessity
of refrigeration copper piping changes.
Preparation - It is best to eld convert the unit on the
ground before hanging. If the unit is already hung it
should be taken down for the eld conversion.
Side to Back Discharge Conversion
1. Place unit in well lit area. Remove the screws as shown
in Figure 4 to free top panel and discharge panel.
2. Lift out the access panel and set aside. Lift and rotate
the discharge panel to the other position as shown,
being careful with the blower wiring.
3. Check blower wire routing and connections for
tension or contact with sheet metal edges. Re-route
if necessary.
4. Check refrigerant tubing for contact with other
components.
5. Reinstall top panel and screws noting that the
location for some screws will have changed.
6. Manually spin the fan wheel to ensure that the wheel
is not rubbing or obstructed.
7. Replace access panels.
Back to Side Discharge Conversion - If the discharge is
changed from back to side, use above instruction noting
that illustrations will be reversed.
Left vs. Right Return - It is not possible to eld convert
return air between left or right return models due to
the necessity of refrigeration copper piping changes.
However, the conversion process of side to back or
back to side discharge for either right or left return
conguration is the same. In some cases, it may be
possible to rotate the entire unit 180 degrees if the return
air connection needs to be on the opposite side. Note that
rotating the unit will move the piping to the other end of
the unit.
Water
Connection End
Return Air
Remove Screws
Water
Connection End
Return Air
Rotate
Move to Side
Side Discharge
Return Air
Water
Connection End
Discharge Air
Drain
Back Discharge
Replace Screws
Extremo de Con
Conducto de Alimentación
Retorno de Aire
Extremo de Conexión de Agua
Drenaje
Retorno de Aire
Descarga de Aire
Descarga Lateral
Water
Connection End
Supply Duct
Return Air
Water
Connection End
Drain
Return Air
Discharge Air
Side Discharge
Back Discharge
Figure 5: Right Return Side to Back
Figure 4: Left Return Side to Back

Installation, Operation, Maintenance
10
Installation, Operation & Maintenance - HBH/HBV Compact Series
Horizontal Installation, Cont’d.
Duct System Installation - Proper duct sizing and design
is critical to the performance of the unit. The duct system
should be designed to allow adequate and even airow
through the unit during operation. Air ow through the
unit MUST be at or above the minimum stated airow
for the unit to avoid equipment damage. Duct systems
should be designed for quiet operation. Refer to Figure 3
for horizontal duct system details or Figure 8 for vertical
duct system details. A exible connector is recommended
for both discharge and return air duct connections on
metal duct systems to eliminate the transfer of vibration
to the duct system. To maximize sound attenuation of
the unit blower, the supply and return plenums should
include internal berglass duct liner or be constructed
from ductboard for the rst few feet. Application of the
unit to uninsulated ductwork in an unconditioned space
is not recommended, as the unit’s performance may be
adversely affected.
At least one 90° elbow should be included in the supply
duct to reduce air noise. If air noise or excessive air ow is
a problem, the blower speed can be changed. For airow
charts, consult submittal data for the series and model of
the specic unit.
If the unit is connected to existing ductwork, a previous
check should have been made to ensure that the
ductwork has the capacity to handle the airow required
for the unit. If ducting is too small, as in the replacement
of a heating only system, larger ductwork should be
installed. All existing ductwork should be checked for
leaks and repaired as necessary.
Condensate Piping - Horizontal Units - A condensate
drain line must be installed and pitched away for the unit
to allow for proper drainage. This connection must meet
all local plumbing/building codes.
Pitch the unit toward the drain as shown in Figure 2 to
improve the condensate drainage. On small units (less
than 2.5 tons/8.8 kW), ensure that unit pitch does not
cause condensate leaks inside the cabinet.
Install condensate trap at each unit with the top of
the trap positioned below the unit condensate drain
connection as shown in Figure 6. Design the depth of
the trap (water-seal) based upon the amount of ESP
capability of the blower (where 2 inches [51mm] of
ESP capability requires 2 inches [51mm] of trap depth).
As a general rule, 1-1/2 inch [38mm] trap depth is the
minimum.
Models with Water Side Economizer (Model Digit 12 is
1-4) Must trap WSE same as unit, can join together
after vent.
Each unit must be installed with its own individual trap
and connection to the condensate line (main) or riser.
Provide a means to ush or blow out the condensate line.
DO NOT install units with a common trap and/or vent.
Always vent the condensate line when dirt or air can
collect in the line or a long horizontal drain line is required.
Also vent when large units are working against higher
external static pressure than other units connected
to the same condensate main since this may cause
poor drainage for all units on the line. WHEN A VENT
IS INSTALLED IN THE DRAIN LINE, IT MUST BE
LOCATED AFTER THE TRAP IN THE DIRECTION OF
THE CONDENSATE FLOW.
Polymer Drain Pans - condensate drain connection is
a rubber coupling that connects to 3/4” schedule 40/80
PVC. Use hose clamps to secure the pipe inside the
coupling. If the connection is not secure, the connection
may leak.
Instructions for coupling the condensate drain to the trap
are included in the bag that includes the coupling and
CAUTION! Ensure condensate line is pitched toward drain
1/8 inch per ft [11 mm per m] of run.
⚠ CAUTION! ⚠
2”
1.5”
1.5”
1/8” Per
Foot
Figure 6: Horizontal Condensate Connection

Installation, Operation, Maintenance 11
Installation, Operation & Maintenance - HBH/HBV Compact Series
Vertical Installation
Vertical Unit Location - Units are not designed for
outdoor installation. Locate the unit in an INDOOR area
that allows enough space for service personnel to perform
typical maintenance or repairs without removing unit from
the mechanical room/closet. Vertical units are typically
installed in a mechanical room or closet. Never install
units in areas subject to freezing or where humidity levels
could cause cabinet condensation (such as unconditioned
spaces subject to 100% outside air). Consideration
should be given to access for easy removal of the lter
and access panels. Provide sufcient room to make water,
electrical, and duct connection(s).
If the unit is located in a conned space, such as a closet,
provisions must be made for return air to freely enter the
space by means of a louvered door, etc. Any access panel
screws that would be difcult to remove after the unit is
installed should be removed prior to setting the unit. Refer
to Figures 7 and 8 for typical installation illustrations.
Refer to unit submittal data or engineering design guide
for dimensional data.
1. Install the unit on a piece of rubber, neoprene or other
mounting pad material for sound isolation. The pad
should be at least 3/8” [10mm] to 1/2” [13mm] in
thickness. Extend the pad beyond all four edges of
the unit.
2. Provide adequate clearance for lter replacement
and drain pan cleaning. Do not block lter access
with piping, conduit or other materials. Refer to
unit submittal data or engineering design guide for
dimensional data.
3. Provide access for fan and fan motor maintenance
and for servicing the compressor and coils without
removing the unit.
4. Provide an unobstructed path to the unit within the
closet or mechanical room. Space should be sufcient
to allow removal of the unit, if necessary.
5. In limited side access installations, pre-removal of the
control box side mounting screws will allow control
box removal for future servicing.
6. Provide access to water valves and ttings and
screwdriver access to the unit side panels, discharge
collar and all electrical connections.
Flexible canvas duct
connector to reduce
noise and vibration
Use turning vanes in
supply transition
Internally insulate return
transition duct to reduce noise Rev.: 2/13
Internally insulate supply
duct for the first 4’ (1.2m)
each way to reduce noise
Rounded return
transition
Remove supply duct
flanges from inside blower
compartment and install
on supply air opening of
unit. Do not use a supply
air plenum/duct smaller
than the size of the supply
duct flanges.
Flexible canvas duct
connector to reduce
noise and vibration
Use turning vanes in
supply transition
Internally insulate supply
duct for first 1.2 m each way
to reduce noise
Internally insulate return
transition duct to reduce noise
Rounded return
transition
Remove supply duct
flanges from inside blower
compartment and install
on supply air opening of
unit. Do not use a supply
air plenum/duct smaller
than the size of the supply
duct flanges.
bloque o del ladrillo o sacado
Cojín del aire o sacado
Bloque o ladrillo concreto
Air Pad or extruded
polystyrene insulation board
Figure 7: Vertical Unit Mounting
Figure 8: Typical Vertical Unit Installation
Using Ducted Return Air
Notice! Installation Note - Ducted Return: Many
horizontal WSHPs are installed in a return air ceiling
plenum application (above ceiling). Vertical WSHPs
are commonly installed in a mechanical room with free
return (e.g. louvered door). Therefore, lter rails are the
industry standard and are included on our commercial
heat pumps for the purposes of holding the lter only. For
ducted return applications, the lter rail must be removed
and replaced with a duct ange or lter frame. Canvas
or exible connectors should also be used to minimize
vibration between the unit and ductwork.

Installation, Operation, Maintenance
12
Installation, Operation & Maintenance - HBH/HBV Compact Series
Vertical Installation, Cont’d.
Sound Attenuation for Vertical Units - Sound
attenuation is achieved by enclosing the unit within a
small mechanical room or a closet. Additional measures
for sound control include the following:
1. Mount the unit so that the return air inlet is 90° to the
return air grille. Refer to Figure 9. Install a sound bafe
as illustrated to reduce line-of sight sound transmitted
through return air grilles.
2. Mount the unit on a rubber or neoprene isolation
pad to minimize vibration transmission to the
building structure.
Return
Air Inlet
Figure 9: Vertical Sound Attenuation
Notice! Units with clear plastic drain lines should have
regular maintenance (as required) to avoid buildup of
debris, especially in new construction.
Condensate Piping for Vertical Units - A condensate
line must be installed and pitched away from the unit to
allow for proper drainage. This connection must meet all
local plumbing/building codes.
Install condensate trap at each unit with the top of the trap
positioned below the unit condensate drain connection as
shown in Figure 10. Design the depth of the trap (water-
seal) based upon the amount of ESP capability of the
blower (where 2 inches [51mm] of ESP capability requires
2 inches [51mm] of trap depth).As a general rule, 1-1/2
inch [38mm] trap depth is the minimum.
Always vent the condensate line when dirt or air can
collect in the line or a long horizontal drain line is required.
Also vent when large units are working against higher
external static pressure than other units connected
to the same condensate main since this may cause
poor drainage for all units on the line. WHEN A VENT
IS INSTALLED IN THE DRAIN LINE, IT MUST BE
LOCATED AFTER THE TRAP IN THE DIRECTION OF
THE CONDENSATE FLOW.
Each unit must be installed with its own individual vent
(where necessary) and a means to ush or blow out the
condensate drain line. Do not install units with a common
trap and/or vent.
Condensate drain connection is a rubber coupling that
couples to 3/4” schedule 40/80 PVC. Use hose clamps to
secure the pipe inside the coupling. If the connection is
not secure, the connection may leak.
Instructions for coupling the condensate drain to the trap
are included in the bag that includes the coupling and
hose clamps.
Figure 10: Vertical Condensate Drain
2”
1.5”
1.5”
1/8” Per
Foot

Installation, Operation, Maintenance 13
Installation, Operation & Maintenance - HBH/HBV Compact Series
Piping Installation
Installation of Supply and Return Piping
Follow these piping guidelines.
1. Install a drain valve at the base of each supply and
return riser to facilitate system ushing.
2. Install shut-off / balancing valves and unions at each
unit to permit unit removal for servicing.
3. Place strainers at the inlet of each system
circulating pump.
4. Select the proper hose length to allow slack between
connection points. Hoses may vary in length by +2%
to -4% under pressure.
5. Refer to Table 1. Do not exceed the minimum bend
radius for the hose selected. Exceeding the minimum
bend radius may cause the hose to collapse, which
reduces water ow rate. Install an angle adapter to
avoid sharp bends in the hose when the radius falls
below the required minimum.
Insulation is not required on loop water piping except
where the piping runs through unheated areas, outside
the building or when the loop water temperature is below
the minimum expected dew point of the pipe ambient
conditions. Insulation is required if loop water temperature
drops below the dew point (insulation is required for
ground loop applications in most climates).
Pipe joint compound is not necessary when Teon®
thread tape is pre-applied to hose assemblies or when
ared-end connections are used. If pipe joint compound
is preferred, use compound only in small amounts on
the external pipe threads of the tting adapters. Prevent
sealant from reaching the ared surfaces of the joint.
Note: When antifreeze is used in the loop, ensure that
it is compatible with the Teon®tape or pipe joint com-
pound that is applied.
Maximum allowable torque for brass ttings is 30 ft-lbs
[41 N-m]. If a torque wrench is not available, tighten
nger-tight plus one quarter turn. Tighten steel ttings
as necessary.
Models with Waterside Economizer Option (Model
Digit 12 is 1-4) - Field fabricate water piping to connect
WSE out to unit in. Allow room to remove front access
panel and service unit. Insulate pipe. Hoses are not
recommended due to high pressure drop.
Optional pressure-rated hose assemblies designed
specically for use with our units are available. Similar
hoses can be obtained from alternate suppliers. Supply
and return hoses are tted with swivel-joint ttings at one
end to prevent kinking during installation. Refer to Figure
11 for an illustration of a typical supply/return hose kit.
Adapters secure hose assemblies to the unit and risers.
Install hose assemblies properly and check regularly to
avoid system failure and reduced service life.
A backup wrench is required when tightening water
connections on HB Series units to prevent water line
damage.
CAUTION! Corrosive system water requires corrosion
resistant ttings and hoses, and may require water treatment.
CAUTION! Do not bend or kink supply lines or hoses.
⚠ CAUTION! ⚠
⚠ CAUTION! ⚠
⚠ CAUTION! ⚠
CAUTION! Piping must comply with all applicable codes.
WARNING! Polyolester Oil, commonly known as POE oil, is
a synthetic oil used in many refrigeration systems including
those with HFC-410A refrigerant. POE oil, if it ever comes
in contact with PVC or CPVC piping, may cause failure of
the PVC/CPVC. PVC/CPVC piping should never be used
as supply or return water piping with water source heat
pump products containing HFC-410A as system failures and
property damage may result.
⚠ WARNING! ⚠
Table 1: Metal Hose Minimum Bend Radii
Hose Diameter Minimum Bend Radii
1/2" [12.7mm] 2-1/2" [6.4cm]
3/4" [19.1mm] 4" [10.2cm]
1" [25.4mm] 5-1/2" [14cm]
1-1/4" [31.8mm] 6-3/4" [17.1cm]
NOTICE! Do not allow hoses to rest against structural
building components. Compressor vibration may be
transmitted through the hoses to the structure, causing
unnecessary noise complaints.
Figure 11: Supply/Return Hose Kit
Rib Crimped
Length
(2 ft [0.6m] Length Standard)
Swivel
Brass
Fitting
Brass
Fitting
MPT
Reborde Acanalado
Longitud
(Long. Estándar de 2 pies)
Accesorio
Giratorio
de Bronce
Accesorio
de Bronce
MPT
MPT
MPT
Rib Crimped
Length
(0.6m Length Standard)
Swivel
Brass
Fitting
Brass
Fitting
MPT
MPT

Installation, Operation, Maintenance
14
Installation, Operation & Maintenance - HBH/HBV Compact Series
Water-Loop Heat Pump Applications
Commercial Water Loop Applications
Commercial systems typically include a number of units
connected to a common piping system. Any unit plumbing
maintenance work can introduce air into the piping system;
therefore air elimination equipment is a major portion of the
mechanical room plumbing. Consideration should be given
to insulating the piping surfaces to avoid condensation. The
manufacturer recommends unit insulation any time the water
temperature is expected to be below 60ºF (15.6ºC). Metal
to plastic threaded joints should never be used due to their
tendency to leak over time.
Teon®tape thread sealant is recommended to minimize
internal fouling of the heat exchanger. Do not over tighten
connections and route piping so as not to interfere with
service or maintenance access. Hose kits are available from
the manufacturer in different congurations as shown in
Figure 12 for connection between the unit and the piping
system. Depending upon selection, hose kits may include
shut off valves, P/T plugs for performance measurement,
high pressure stainless steel braided hose, “Y” type strainer
with blow down valve, and/or “J” type swivel connection.
Balancing valves and an external low pressure drop solenoid
valve for use in variable speed pumping systems may also be
included in the hose kit.
The piping system should be ushed to remove dirt, piping
chips, and other foreign material prior to operation (see
“Piping System Cleaning and Flushing Procedures” in this
manual). The ow rate is usually set between 2.25 and 3.5
gpm per ton [2.9 and 4.5 l/m per kW] of cooling capacity. The
manufacturer recommends 3 gpm per ton [3.9 l/m per kW]
for most applications of water loop heat pumps. To ensure
proper maintenance and servicing, P/T ports are imperative
for temperature and ow verication, as well as performance
checks.
Water loop heat pump (cooling tower/boiler) systems
typically utilize a common loop, maintained between
60 - 90°F [16 - 32°C]. The use of a closed circuit evaporative
cooling tower with a secondary heat exchanger between the
tower and the water loop is recommended. If an open type
cooling tower is used continuously, chemical treatment and
ltering will be necessary.
Figure 12: Typical Water-Loop Application
Low Water Temperature Cutout Setting - CXM2 Control
When antifreeze is selected, the LT1 jumper (JW3) should
be clipped to select the low temperature (antifreeze 10.0°F
[-12.2°C]) setpoint and avoid nuisance faults (see “Low
Water Temperature Cutout Selection” in this manual). Note:
Low water temperature operation requires extended
range equipment.
(by others)
Thermostat
Wiring
Ball Valve with optional
integral P/T plug
Building
Loop
Unit Power
Disconnect
Power Wiring
Insulated supply duct with
at least one 90 deg elbow
to reduce air noise
Return Air
Supply Air
Unit Hanger Kits
(included)
3/8" [10mm] threaded rods
Unit Power
Stainless steel braid hose
with integral "J" swivel
Optional Low Pressure Drop Water
Control Valve
(can be internally mounted)

Installation, Operation, Maintenance 15
Installation, Operation & Maintenance - HBH/HBV Compact Series
Ground-Loop Heat Pump Applications
CAUTION! The following instructions represent industry
accepted installation practices for closed loop earth coupled
heat pump systems. Instructions are provided to assist the
contractor in installing trouble free ground loops. These
instructions are recommendations only. State/provincial
and local codes MUST be followed and installation 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!
⚠ CAUTION! ⚠
CAUTION! Ground loop applications require extended range
equipment and optional refrigerant/water circuit insulation.
Pre-Installation
Prior to installation, locate and mark all existing underground
utilities, piping, etc. Install loops for new construction before
sidewalks, patios, driveways, and other construction has
begun. During construction, accurately mark all ground loop
piping on the plot plan as an aid in avoiding potential future
damage to the installation.
Piping Installation
The typical closed loop ground source system is shown in
Figure 12. All earth loop piping materials should be limited
to polyethylene fusion only for in-ground sections of the
loop. Galvanized or steel ttings should not be used at any
time due to their tendency to corrode. All plastic to metal
threaded ttings should be avoided due to their potential to
leak in earth coupled applications. A anged tting should
be substituted. P/T plugs should be used so that ow can be
measured using the pressure drop of the unit heat exchanger.
Earth loop temperatures can range between 25 and 110°F
[-4 to 43°C]. Flow rates between 2.25 and 3 gpm [2.41 to
3.23 l/m per kW] of cooling capacity is recommended in
these applications.
Test individual horizontal loop circuits before backlling.
Test vertical U-bends and pond loop assemblies prior to
installation. Pressures of at least 100 psi [689 kPa] should
be used when testing. Do not exceed the pipe pressure
rating. Test entire system when all loops are assembled.
Flushing the Earth Loop
Upon completion of system installation and testing, ush
the system to remove all foreign objects and purge to
remove all air.
Antifreeze
I n areas where minimum entering loop temperatures drop
below 40°F [5°C] or where piping will be routed through
areas subject to freezing, antifreeze is required. Alcohols
and glycols are commonly used as antifreeze; however
your local sales ofce should be consulted to determine
the antifreeze best suited to your area. Freeze protection
should be maintained to 15°F [9°C] below the lowest
expected entering loop temperature. For example, if 30°F
[-1°C] is the minimum expected entering loop temperature,
the leaving loop temperature would be 22 to 25°F [-6 to
-4°C] and freeze protection should be at 15°F [-10°C].
Calculation is as follows:
30°F - 15°F = 15°F [-1°C - 9°C = -10°C].
All alcohols should be premixed and pumped from
a reservoir outside of the building when possible or
introduced under the water level to prevent fumes.
Calculate the total volume of uid in the piping system.
Then use the percentage by volume shown in Table
2 for the amount of antifreeze needed. Antifreeze
concentration should be checked from a well mixed
sample using a hydrometer to measure specic gravity.
Low Water Temperature Cutout Setting - CXM2 Control
When antifreeze is selected, the LT1 jumper (JW3) should
be clipped to select the low temperature (antifreeze 10.0°F
[-12.2°C]) setpoint and avoid nuisance faults (see “Low
Water Temperature Cutout Selection” in this manual). Note:
Low water temperature operation requires extended
range equipment.
Table 2: Antifreeze Percentages by Volume
Type Minimum Temperature for Low Temperature Protection
10°F [-12.2°C] 15°F [-9.4°C] 20°F [-6.7°C] 25°F [-3.9°C]
Methanol
100% USP food grade Propylene Glycol
Ethanol*
25%
38%
29%
21%
25%
25%
16%
22%
20%
10%
15%
14%
* Must not be denatured with any petroleum based product

Installation, Operation, Maintenance
16
Installation, Operation & Maintenance - HBH/HBV Compact Series
High and
Low Voltage
Knockouts
Vibration Isolation Pad
To Thermostat
Loop
Water
Ground-Loop Heat Pump Applications, Cont’d.
Figure 13: Typical Ground-Loop Application

Installation, Operation, Maintenance 17
Installation, Operation & Maintenance - HBH/HBV Compact Series
Ground-Water Heat Pump Applications
Open Loop - Ground Water Systems - Typical open loop
piping is shown in Figure 14. Shut off valves should be
included for ease of servicing. Boiler drains or other valves
should be “tee’d” into the lines to allow acid ushing of the
heat exchanger. Shut off valves should be positioned to
allow ow through the coax via the boiler drains without
allowing ow into the piping system. P/T plugs should
be used so that pressure drop and temperature can be
measured. Supply and return water piping materials
should be limited to copper, PE, or similar material. PVC
or CPVC should never be used as they are incompatible
with the POE oils used in HFC-410A products and piping
system failure and property damage may result.
Water quantity should be plentiful and of good quality.
Consult table 3 for water quality guidelines. The unit can
be ordered with either a copper or cupro-nickel water
heat exchanger. Consult Table 3 for recommendations.
Copper is recommended for closed loop systems and
open loop ground water systems that are not high
in mineral content or corrosiveness. In conditions
anticipating heavy scale formation or in brackish water, a
cupro-nickel heat exchanger is recommended. In ground
water situations where scaling could be heavy or where
biological growth such as iron bacteria will be present, an
open loop system is not recommended. Heat exchanger
coils may over time lose heat exchange capabilities due to
build up of mineral deposits. Heat exchangers must only
be serviced by a qualied technician, as acid and special
pumping equipment is required. Desuperheater coils can
likewise become scaled and possibly plugged. In areas
with extremely hard water, the owner should be informed
that the heat exchanger may require occasional acid
ushing. In some cases, the desuperheater option should
not be recommended due to hard water conditions and
additional maintenance required.
WARNING! Polyolester Oil, commonly known as POE oil, is
a synthetic oil used in many refrigeration systems including
those with HFC-410A refrigerant. POE oil, if it ever comes
in contact with PVC or CPVC piping, may cause failure of
the PVC/CPVC. PVC/CPVC piping should never be used
as supply or return water piping with water source heat
pump products containing HFC-410A as system failures and
property damage may result.
⚠ WARNING! ⚠
Water Quality Standards - Table 3 should be consulted
for water quality requirements. Scaling potential should
be assessed using the pH/Calcium hardness method.
If the pH <7.5 and the calcium hardness is less than
100 ppm, scaling potential is low. If this method yields
numbers out of range of those listed, the Ryznar Stability
and Langelier Saturation indecies should be calculated.
Use the appropriate scaling surface temperature for
the application, 150°F [66°C] for direct use (well water/
open loop); 90°F [32°F] for indirect use. A monitoring
plan should be implemented in these probable scaling
situations. Other water quality issues such as iron fouling,
corrosion prevention and erosion and clogging should be
referenced in Table 3.
Expansion Tank and Pump - Use a closed, bladder-
type expansion tank to minimize mineral formation due
to air exposure. The expansion tank should be sized to
provide at least one minute continuous run time of the
pump using its drawdown capacity rating to prevent
pump short cycling. Discharge water from the unit is not
contaminated in any manner and can be disposed of in
various ways, depending on local building codes (e.g.
recharge well, storm sewer, drain eld, adjacent stream
or pond, etc.). Most local codes forbid the use of sanitary
sewer for disposal. Consult your local building and zoning
department to assure compliance in your area.
Water Control Valve - Note the placement of the
water control valve in Figure 14. Always maintain
water pressure in the heat exchanger by placing the
water control valve(s) on the discharge line to prevent
mineral precipitation during the off-cycle. Pilot operated
slow closing valves are recommended to reduce water
hammer. If water hammer persists, a mini-expansion
tank can be mounted on the piping to help absorb the
excess hammer shock. Ensure that the total ‘VA’ draw
of the valve can be supplied by the unit transformer. For
instance, a slow closing valve can draw up to 35VA. This
can overload smaller 40 or 50 VA transformers depending
on the other controls in the circuit. A typical pilot operated
solenoid valve draws approximately 15VA (see Figure 19).
Note the special wiring diagrams for slow closing valves
(Figures 20 & 21).

Installation, Operation, Maintenance
18
Installation, Operation & Maintenance - HBH/HBV Compact Series
Ground-Water Heat Pump Applications, Cont’d.
Flow Regulation - Flow regulation can be accomplished
by two methods. One method of ow regulation involves
simply adjusting the ball valve or water control valve on
the discharge line. Measure the pressure drop through the
unit heat exchanger, and determine ow rate from Tables
8a through 8e. Since the pressure is constantly varying,
two pressure gauges may be needed. Adjust the valve
until the desired ow of 1.5 to 2 gpm per ton [2.0 to 2.6
l/m per kW] is achieved. A second method of ow control
requires a ow control device mounted on the outlet of
the water control valve. The device is typically a brass
tting with an orice of rubber or plastic material that is
designed to allow a specied ow rate. On occasion, ow
control devices may produce velocity noise that can be
reduced by applying some back pressure from the ball
valve located on the discharge line. Slightly closing the
valve will spread the pressure drop over both devices,
lessening the velocity noise.
Note: When EWT is below 50°F [10°C], 2 gpm per ton
(2.6 l/m per kW) is required.
Water Coil Low Temperature Limit Setting - For all
open loop systems the 30°F [-1.1°C] FP1 setting (factory
setting-water) should be used to avoid freeze damage to
the unit. See “Low Water Temperature Cutout Selection”
in this manual for details on the low limit setting.
Figure 14: Typical Open Loop/Well Application
Tanque de
Presión
Vá lvula
de Retención
Drenajes
de Calder a
Regulador
de Fluj o
Entrada
de Agua
Salida de Agua
Vá lvula
Filtro
Opcional
Tapones P/ T
Vibration
Isolation Pad
Unit Power
Disconnect
High and low
voltage
knockouts
Pressure
Tank
Shut-Off
Va lve
Boiler
Drains
Flow
Regulator
Water In
Water Out
Water
Control
Va lve
Optional
Filter
P/T Plugs
To Thermostat

Installation, Operation, Maintenance 19
Installation, Operation & Maintenance - HBH/HBV Compact Series
Water Quality Standards
pH - Chilled Water 0.7F°58< to 9.0 7.0 to 9.0 7.0 to 9.0 7.0 to 9.0
pH - Heated Water 0.8F°58> to 10.0 8.0 to 10.0 8.0 to 10.0 8.0 to 10.0
Alkalinity
(
HCO3
)
ppm - CaCO
3
equiv. 50 to 500 50 to 500 50 to 500 50 to 500
Calcium (Ca)ppm <100 <100 <100 <100
Magnesium (Mg)ppm <100 <100 <100 <100
Total Hardness (CaCO3)ppm - CaCO3 equiv. 30 to 150 150 to 450 150 to 450 150 to 450
Langelier Satura�on Index LSI -0.5 to +0.5 -0.5 to +0.5 -0.5 to +0.5 -0.5 to +0.5
Ryznar Stability 5.6ISRxednI to 8.0 6.5 to 8.0 6.5 to 8.0 6.5 to 8.0
Total Dissolved Solids (TDS) ppm - CaCO
3
equiv. <1000 <1000 <1000 <1500
Sulfate (SO
4
2-
)ppm <200 <200 <200 <200
Nitrate(NO
3
-
)001<001<001<001<mpp
Chlorine (free)(Cl) ppm <0.5 <0.5 <0.5 <0.5
Chloride (water < 80°F) ppm <20 <20 <150 <150
Chloride (water > 120°F) ppm <20 <20 <125 <125
Hydrogen Sulfideα(H
2
S) 5.0<5.0<5.0<5.0<bpp
Carbon Dioxide (CO
2
)ppm 0 <50 10 to 50 10 to 50
Iron Oxide (Fe) ppm <1.0 <1.0 <1.0 <0.2
Manganese (Mn)ppm < 0.4 <0.4 <0.4 <0.4
Ammonia (NH
3
)ppm <0.05 <0.1 <0.1 <0.1
Chloramine (NH
2
CL) ppm 0 0 0 0
Iron 0000Lm/sllecairetcaB
Slime Forming 0000Lm/sllecairetcaB
Sulfate reducing 0000Lm/sllecairetcab
Suspended Solidsβ01<01<01<01<mpp)SST(
Earth Ground Resistanceχ0smhO Consult NEC & local electrical codes for grounding requirements
Electrolysis Voltageδ003<Vm Measure voltage internal water loop to HP ground
Leakage Currentδ51<Am Measure current in water loop pipe
Building Primary Electrical Ground to unit, must meet local diameter and penetra�on length requirements
WATER QUALITY STANDARDS
For Closed-Loop and Open-Loop Systems
All Heat Exchanger
Types
COAXIAL HX Copper
Tube in Tube
COAXIAL HX
Cupronickel
Brazed Plate HX
316 SS
Symbol UnitsDescrip�on
Electrolysis
All HX types Scaling Poten�alCorrosion Preven�on
(Cl
-
)
Fouling &
Biological
Do not connect heat pump to steel pipe unless dissimilar materials are separated by using Di-electric unions. Galvanic corrosion of heat
pump water pipe will occur.
Heat Exchanger Type
Closed Loop
Recircula�ng Open Loop, Tower, Ground Source Well
-
Table 3: Water Quality Standards
Clean water is essential to the performance and life span of water source heat pumps. Contaminants, chemicals, and
minerals all have the potential to cause damage to the water heat heat exchanger if not treated properly. All closed water
loop systems should undergo water quality testing and be maintained to the water quality standards listed in this table.

Installation, Operation, Maintenance
20
Installation, Operation & Maintenance - HBH/HBV Compact Series
Water Quality Standards, Cont’d.
1. The Water Quality Table provides water quality
requirements for coaxial & brazed plate heat
exchangers.
2. The water must be evaluated by an independent
testing facility comparing site samples against
this Table. When water properties are outside of
these parameters, the water must either be treated
by a professional water treatment specialist to
bring the water quality within the boundaries of
this specication, or an external secondary heat
exchanger must be used to isolate the heat pump
water system from the unsuitable water. Failure to
do so will void the warranty of the heat pump system
and will limit liability for damage caused by leaks or
system failure.
3. Regular sampling, testing and treatment of the water
is necessary to assure that the water quality remains
within acceptable levels thereby allowing the heat
pump to operate at optimum levels.
4. If closed‐loop systems are turned off for extended
periods, water samples must be tested prior to
operating the system.
5. For optimal performance, it is recommended that the
closed‐loop piping systems are initially lled with de‐
ionized water.
6. Well water with chemistry outside of these
boundaries, and salt water or brackish water requires
an external secondary heat exchanger. Surface/Pond
water should not be used.
7. If water temperature is expected to fall below 40°F,
antifreeze is required. Refer to the heat pump IOM for
the correct solution ratios to prevent freezing.
αHydrogen Sulde has an odor of rotten eggs. If one
detects this smell, a test for H2S must be performed.
If H2S is detected above the limit indicated,
remediation is necessary (Consult with your Water
Testing/Treatment Professional) or a secondary heat
exchanger is required using appropriate materials as
recommended by the heat exchanger supplier.
βSuspended solids and particulates must be ltered
to prevent fouling and failure of heat exchangers.
Strainers or particulate lters must be installed to
provide a maximum particle size of 600 micron (0.60
mm, 0.023 in.) using a 20 to 30 mesh screen size.
When a loop is installed in areas with ne material
such as sand or clay, further ltration is required to a
maximum of 100 micron. Refer to the Strainer / Filter
Sizing Chart to capture the particle sizes encountered
on the site.
χ An electrical grounding system using a dedicated
ground rod meeting NEC and Local Electrical
codes must be installed. Building Ground must not
be connected the WSHP piping system or other
plumbing pipes.
δ Refer to IOM for instructions on measuring resistance
and leakage currents within water loops.
Do not use PVC pipe for water loop (compressor POE
oil and glycols damage PVC) use of HDPE pipe is
recommended.
Strainer / Filter Sizing
Mesh Size Particle Size
Microns MM Inch
20 840 0.840 0.0340
30 533 0.533 0.0210
60 250 0.250 0.0100
100 149 0.149 0.0060
150 100 0.100 0.0040
200 74 0.074 0.0029
ppm = parts per million
ppb = parts per billion