Mars Comfort-aire Century HBH Series Instruction manual

Large Belt Drive
(HBH/V) Series
HBH 072-120
HBV 072-300
60Hz - HFC-410A
517.787.2100 • www.marsdelivers.com • www.heatcontroller.com
Installation, Operation
& Maintenance Manual

Installation, Operation & Maintenance Manual - HBH-HBV Large
Table of Contents
Model Nomenclature ........................................................................................................................................................3
General Information..........................................................................................................................................................4
HBH Physical Data...........................................................................................................................................................6
HBV Physical Data........................................................................................................................................................... 8
Horizontal Installation..................................................................................................................................................... 12
HBH Field Conversion of Air Discharge..........................................................................................................................14
Vertical Installation..........................................................................................................................................................17
HBV Field Conversion of Air Discharge..........................................................................................................................18
HBV072-240 Field Conversion of Air Discharge.............................................................................................................19
HBV300 Field Conversion of Air Discharge....................................................................................................................22
HBV Field Conversion of Control Box ............................................................................................................................25
HBV Field Conversion of Water Connections.................................................................................................................26
Vertical Condensate Installation.....................................................................................................................................27
Piping Installation ...........................................................................................................................................................28
Water-Loop Heat Pump Applications..............................................................................................................................29
Ground-Loop Heat Pump Applications...........................................................................................................................30
Ground-Water Heat Pump Applications..........................................................................................................................32
Water Quality Standards ................................................................................................................................................34
Electrical - Line Voltage..................................................................................................................................................35
Electrical - Power Wiring ................................................................................................................................................37
Electrical - Power & Low Voltage Wiring ........................................................................................................................38
Electrical - Thermostat Wiring ........................................................................................................................................40
Controls - CXM2 and DXM2....5........................................................................................................................................ 41
Blower Adjustment.......................................................................................................................................................... 42
Tensioning V-Belt Drives................................................................................................................................................. 43
Blower Sheave Information ............................................................................................................................................ 44
HBH/V 072 Blower Performance.................................................................................................................................... 45
HBH/V 096 Blower Performance.................................................................................................................................... 46
HBH/V 120 Blower Performance.................................................................................................................................... 48
Blower Performance Data – HBV160 Standard Unit...................................................................................................... 50
Blower Performance Data – HBV192 Standard Unit...................................................................................................... 51
Blower Performance Data – HBV240 Standard Unit...................................................................................................... 52
Blower Performance Data – HBV300 Standard Unit...................................................................................................... 54
Unit Starting and Operating Conditions.......................................................................................................................... 55
Piping System Cleaning and Flushing............................................................................................................................ 56
Unit Starting and Operating Conditions.......................................................................................................................... 57
Unit Start-Up Procedure................................................................................................................................................. 58
Unit Operating Conditions .............................................................................................................................................. 60
Start-Up Log Sheet......................................................................................................................................................... 61
Preventive Maintenance................................................................................................................................................. 62
Circuit Diagram with Safety Devices .............................................................................................................................. 63
Functional Troubleshooting ............................................................................................................................................ 64
Performance Troubleshooting ........................................................................................................................................ 65
Functional Troubleshooting Form................................................................................................................................... 66
Revision Log .................................................................................................................................................................. 68

Installation, Operation & Maintenance Manual -
HBH-HBV Large
Model Nomenclature
3
HB H A0 9 6 C4 3 A C S
1 2 3 4 5 6 7
8
9 10 11 12 13
HB = Heat Controller Compact
Model Type
H = Horizontal
V = Vertical
Configuration
072
Unit Size
096
120
[1]
[4]
160
192
240
300
Revision Level
A = Current Revision
Voltage
Controls Cabinet Insulation
Blower Drive Package
Heat Exchanger Options
L = Left Return
Horizontal Only
Vertical Only
Return Air Flow Configuration
R = Right Return
V = Left Return, S.S. Drain Pan
W = Right Return, S.S. Drain Pan
B = Back Return
F = Front Return
Y = Back Return, S.S. Drain Pan
Z = Front Return, S.S. Drain Pan
A = Standard RPM & Standard Motor
B = Low RPM & Standard Motor
C = High RPM & Standard Motor
D = Standard RPM & Large Motor
E = High RPM & Large Motor
3 = 208-230/60/3
4 = 460/60/3
5 = 575/60/3
S = Straight Supply
Supply Air Flow Configuration
B = Back Supply
F = Front Return
T = Top Supply
L
14
C= CXM2
D= DXM2.5
N= CXM2w/MPC
1. Sizes160-300 are vertical only
2. When digit12 is 1,2, 3,or 4digit9mustbeD, M,or P.
3. When digit12 is 1,2, 3,or 4digit10 must be1, 2,A,B, C,or D.
4. Horizontal units notavailablewith4" filterframes.
P= DXM2.5 w/MPC
[2,3]

Installation, Operation & Maintenance Manual - HBH-HBV Large
General Information
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.
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.
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 will quickly become clogged with construction dirt and
debris, which may cause system damage.
WARNING!
WARNING!
WARNING!
WARNING!
CAUTION!
WARNING! The EarthPure®Application and Service Manual
should be read and understood before attempting to service
refrigerant circuits with HFC-410A.
Storage
Pre-Installation
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.
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.
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.
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.
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.
4

Installation, Operation & Maintenance Manual - HBH-HBV Large
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 may cause equipment damage.
CAUTION!
CAUTION!
CAUTION!
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.
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. Some airow patterns and some control box
locations are eld convertible. Locate the conversion
section of this IOM.
5

Installation, Operation & Maintenance Manual - HBH-HBV Large
6
HBH Physical Data
HBH072 HBH096 HBH120
Weight - Operating (lbs) [kg] 586 [265.8] 644 [292.1] 698 [316.6]
Weight - Packaged (lbs) [kg] 626 [283.9] 684 [310.3] 738 [334.8]
Weight - Corner - Control box/Compressor side (lbs) [kg] 235 [106.6] 254 [115.2] 271 [122.9]
Weight - Corner - Compressor side (lbs) [kg] 101 [45.8] 120 [54.4] 137 [62.1]
Weight - Corner - Blower side (lbs) [kg] 180 [81.6] 190 [86.2] 200 [90.7]
Weight - Corner - Air Coil side (lbs) [kg] 70 [31.8] 80 [36.3] 90 [40.8]
HBH072-120 Corner Weights
Model 072 096 120
Compressor Quantity Scroll
Number of Circuits (Compressors) 2
Factory Charge HFC-410a (oz) [kg] per circuit 60 [1.70] 76 [2.15] 80 [2.27]
Blower Motor
Blower Motor Quantity 1
Standard Motor (hp) [kW] 1 [0.75] 2 [1.49] 3 [2.24]
Large Motor (hp) [kW] 2 [1.49] 3 [2.24] 5 [3.73]
Blower
No. of Blowers 1
Blower Wheel Size D x W (in) [cm] 12 x 12 [30.48 x 30.48]
Water Connection Size
FPT (in) [mm] 1-1/4" [31.8] 1-1/2" [38.1]
Coax Volume
Volume (US Gallons) [liters] 1.62 [6.13] 1.81 [6.85] 2.40 [9.08]
Condensate Connection Size
FPT (in) [mm] 3/4" [19.1]
Air Coil Data
Air Coil Dimensions H x W (in) [cm] 20 x 54 [50.8 x 137.2] 20 x 64 [50.8 x 162.6]
Air Coil Total Face Area (ft2) [m2]7.5 [0.70] 8.9 [0.83]
Miscellaneous Data
Filter Standard - 1" [25.4mm] Throwaway (qty)
(in) [cm]
(QTY.3) 16 x 20 [40.6 x 50.8]
(QTY.1) 20 x 20 [50.8 x 50.8]
Weight - Operating (lbs) [kg] 586 [265.8] 644 [292.1] 698 [316.6]
Weight - Packaged (lbs) [kg] 626 [283.9] 684 [310.3] 738 [334.8]
All units have grommet compressor mountings, and 1/2" & 1-3/4" electrical knockouts.
Unit Maximum Water Working Pressure Max Pressure PSIG [kPa]
Base Unit 500 [3445]

Installation, Operation & Maintenance Manual - HBH-HBV Large
7
LEFT RETURN STRAIGHT DISCHARGE
CAP
CAP
FRONT
BSP
A
EAP
CBP
BC
O
PQRK
M
F
GE
D
BSP
RIGHT RETURN STRAIGHT DISCHARGE
1
EAP2CAP
CAP 2
FRONT
CBP
15
4
LEGEND
CAP=Compressor Access Panel
CBP=Control Box Panel
BSP=Blower Service Panel
EAP=Expansion Valve Access panel
1=Water Outlet 1-1/4” FPT (072-096) 1-1/2” FPT(120)
2=Water Inlet 1-1/4” FPT (072-096) 1-1/2” FPT(120)
3=Condensate 3/4” FPT
4=High Voltage 1-1/8” [2.9cm] KO
5=Low Voltage 7/8” [2.2cm] KO
HANGER BRACKET DIMENSIONS
87”
[221cm]
1.0”
[2.54cm]
PLAN VIEW
TOP
4.3”
[10.8cm]
34.1”
[86.6cm]
FRONT
CONTROL BOX
U
T
SV
1.3”
[3.3cm]
condensate LEFT RETURN LEFT VIEW-
AIR COIL SIDE
LEFT RETURN END DISCHARGE
CBP
EAP
BSP
CAP
CAP
FRONT
ED
F
G
CAP
CBP
CAP
EAP
BSP
FRONT
FRONT
CONTROL BOX
PLAN VIEW
TOP
VSU
RIGHT RETURN RIGHT VIEW-
AIR COIL SIDE
RIGHT RETURN END DISCHARGE
1.3”
[3.3cm]
condensate drain
3
NOTES:
-All dimensions in table are inches (cm).
1. Access is required for all removable panels and installer should take care to comply with all building codes and allow
adequate clearance for future field service.
2. Water inlet and water outlet connections are available on either side (left or right) of the unit. Qty (2x) MPT Plugs are
shipped loose in a plastic bag tied to the water leg in front of the unit. Installer must plug water inlet/outlet side not being
connected to.
3.Condensate drain is available on end opposite compressor.
4.Electrical access is available on either side (left or right) of the front.
5. Electric box is on right side. It can be field converted to left side. Conversion should only be attempted by qualified
service technician. If electric box relocated to opposite side, and water connected to opposite side, then this access is
not required.
6. Units require 3’ (9.1 cm) clearance for water connections, CAP, CSP, EAP and BSP service access.
7. Overall cabinet width dimensions does not include filter rail and duct flange.
SERVICE ACCESS
3’ (91 cm.)
Note 5, 6
Note 6
Note 6
Note 6
ALL CONFIGURATIONS REQUIRE SERVICE ACCESS AREA
DESCRIBED IN NOTES 5 AND 6.
HBH072-120 Dimensional Data
LEFT RETURN STRAIGHT DISCHARGE
CAP
CAP
FRONT
BSP
A
EAP
CBP
BC
O
PQRK
M
F
GE
D
BSP
RIGHT RETURN STRAIGHT DISCHARGE
1
EAP2CAP
CAP 2
FRONT
CBP
15
4
LEGEND
CAP=Compressor Access Panel
CBP=Control Box Panel
BSP=Blower Service Panel
EAP=Expansion Valve Access panel
1=Water Outlet 1-1/4” FPT (072-096) 1-1/2” FPT(120)
2=Water Inlet 1-1/4” FPT (072-096) 1-1/2” FPT(120)
3=Condensate 3/4” FPT
4=High Voltage 1-1/8” [2.9cm] KO
5=Low Voltage 7/8” [2.2cm] KO
HANGER BRACKET DIMENSIONS
87”
[221cm]
1.0”
[2.54cm]
PLAN VIEW
TOP
4.3”
[10.8cm]
34.1”
[86.6cm]
FRONT
CONTROL BOX
U
T
SV
1.3”
[3.3cm]
condensate LEFT RETURN LEFT VIEW-
AIR COIL SIDE
LEFT RETURN END DISCHARGE
CBP
EAP
BSP
CAP
CAP
FRONT
ED
F
G
CAP
CBP
CAP
EAP
BSP
FRONT
FRONT
CONTROL BOX
PLAN VIEW
TOP
VSU
RIGHT RETURN RIGHT VIEW-
AIR COIL SIDE
RIGHT RETURN END DISCHARGE
1.3”
[3.3cm]
condensate drain
3
NOTES:
-All dimensions in table are inches (cm).
1. Access is required for all removable panels and installer should take care to comply with all building codes and allow
adequate clearance for future field service.
2. Water inlet and water outlet connections are available on either side (left or right) of the unit. Qty (2x) MPT Plugs are
shipped loose in a plastic bag tied to the water leg in front of the unit. Installer must plug water inlet/outlet side not being
connected to.
3.Condensate drain is available on end opposite compressor.
4.Electrical access is available on either side (left or right) of the front.
5. Electric box is on right side. It can be field converted to left side. Conversion should only be attempted by qualified
service technician. If electric box relocated to opposite side, and water connected to opposite side, then this access is
not required.
6. Units require 3’ (9.1 cm) clearance for water connections, CAP, CSP, EAP and BSP service access.
7. Overall cabinet width dimensions does not include filter rail and duct flange.
SERVICE ACCESS
3’ (91 cm.)
Note 5, 6
Note 6
Note 6
Note 6
ALL CONFIGURATIONS REQUIRE SERVICE ACCESS AREA
DESCRIBED IN NOTES 5 AND 6.
LEFT RETURN STRAIGHT DISCHARGE
CAP
CAP
FRONT
BSP
A
EAP
CBP
BC
O
PQRK
M
F
GE
D
BSP
RIGHT RETURN STRAIGHT DISCHARGE
1
EAP2CAP
CAP 2
FRONT
CBP
15
4
LEGEND
CAP=Compressor Access Panel
CBP=Control Box Panel
BSP=Blower Service Panel
EAP=Expansion Valve Access panel
1=Water Outlet 1-1/4” FPT (072-096) 1-1/2” FPT (120)
2=Water Inlet 1-1/4” FPT (072-096) 1-1/2” FPT (120)
3=Condensate 3/4” FPT
4=High Voltage 1-1/8” [2.9cm] KO
5=Low Voltage 7/8” [2.2cm] KO
HANGER BRACKET DIMENSIONS
87”
[221cm]
1.0”
[2.54cm]
PLAN VIEW
TOP
4.3”
[10.8cm]
34.1”
[86.6cm]
FRONT
CONTROL BOX
U
T
SV
1.3”
[3.3cm]
condensate LEFT RETURN LEFT VIEW-
AIR COIL SIDE
LEFT RETURN END DISCHARGE
CBP
EAP
BSP
CAP
CAP
FRONT
ED
F
G
CAP
CBP
CAP
EAP
BSP
FRONT
FRONT
CONTROL BOX
PLAN VIEW
TOP
VSU
RIGHT RETURN RIGHT VIEW-
AIR COIL SIDE
RIGHT RETURN END DISCHARGE
1.3”
[3.3cm]
condensate drain
3
NOTES:
-All dimensions in table are inches (cm).
1. Access is required for all removable panels and installer should take care to comply with all building codes and allow
adequate clearance for future field service.
2. Water inlet and water outlet connections are available on either side (left or right) of the unit. Qty (2x) MPT Plugs are
shipped loose in a plastic bag tied to the water leg in front of the unit. Installer must plug water inlet/outlet side not being
connected to.
3.Condensate drain is available on end opposite compressor.
4.Electrical access is available on either side (left or right) of the front.
5. Electric box is on right side. It can be field converted to left side. Conversion should only be attempted by qualified
service technician. If electric box relocated to opposite side, and water connected to opposite side, then this access is
not required.
6. Units require 3’ (9.1 cm) clearance for water connections, CAP, CSP, EAP and BSP service access.
7. Overall cabinet width dimensions does not include filter rail and duct flange.
SERVICE ACCESS
3’ (91 cm.)
Note 5, 6
Note 6
Note 6
Note 6
ALL CONFIGURATIONS REQUIRE SERVICE ACCESS AREA
DESCRIBED IN NOTES 5 AND 6.
HBH072-120 Dimensional Data
Model
Overall Cabinet Discharge Connections Duct Flange Water Connections Electrical Knockouts Return Air Connections Using Return Air Opening
A
Depth
B
Width
C
Height
D E
Supply
Depth
F
Supply
Width
G
Supply
Height
K L
1
Water
Outlet
M
2
Water
Inlet
O P Q R S
Return
Depth
T
Return
Height
U V
072-120 in. 36.3 84.9 21.6 14.0 17.0 13.5 7.8 15.0 8.3 4.0 2.0 18.8 16.8 13.8 65.0 18.0 1.0 18.9
cm. 92.2 215.6 54.9 35.6 43.2 34.3 19.8 38.1 21.1 10.2 5.1 47.8 42.7 35.1 165.1 45.7 2.5 48.0

Installation, Operation & Maintenance Manual - HBH-HBV Large
8
HBV Physical Data
Model 072 096 120 160 192 240 300
Compressor Scroll
Number of Circuits (Compressors) 2
Factory Charge HFC-410a - (oz)
[kg] per circuit 60 [1.70] 76 [2.15] 80 [2.27] 112 [3.18] 136 [3.86] 196 [5.56] 224 [6.35]
Blower Motor
Blower Motor Quantity 1
Standard Motor (hp) [kw] 1 [.75] 2[1.49]3 [2.23] 3 [2.24] 3 [2.24] 5 [3.73] 7.5 [5.60]
Optional Large Motor (hp) [kw] 2 [1.49] 3 [2.24] 5 [3.73] 5 [3.73] 5 [3.73] 7.5 [5.59] 10 [7.46]
Blower
No. of Blowers 1 2 3
Blower Wheel Size D x W (in) [cm] 12 x 12 [30.48 x 30.48]
Water Connection Size
FPT (in) [mm] 1-1/4" [31.8] 1-1/2" [38.1] 2" [50.8] 2-1/2" [63.5]
Coax Volume
Volume (US Gallons) [liters] 1.62 [6.13] 1.81 [6.85] 2.40 [9.08] 3.62 [13.70] 4.83 [18.28] 4.90 [18.55] 7.39 [27.98]
Condensate Connection Size
FPT (in) [mm] 3/4" [19.1]
Air Coil Data
Air Coil Dimensions H x W (in) [cm] 32 x 34 [81.28 x 86.36] 36 x 36 [91.44 x 91.44] 36 x 76 [91.44 x 193.04]
Air Coil Total Face Area (ft2) [m2]7.6 [0.71] 9.0 [0.84] 19 [1.77]
Air Coil Tube Size (in) [cm] 3/8" [0.953]
Air Coil Fin Spacing (fpi)
[ns per cm] 14 [5.5] 12 [4.72]
Air Coil Number of Rows 3 2 3 4
Miscellaneous Data
Filter Standard - 1" [25.4mm]
Throwaway (qty) (in) [cm] (QTY.4) 20 x 20 [50.8 x 50.8] (QTY.4) 20 x 25 [50.80 x 63.5] (QTY.2) 20 x 30 [50.80 x 76.2]
Weight - Operating (lbs) [kg] 586 [265.8] 644 [292.1] 698 [316.6] 1069 [484.9] 1164 [528.0] 1184 [537.1] 1297 [588.3]
Weight - Packaged (lbs) [kg] 626 [283.9] 684 [310.3] 738 [334.8] 1149 [521.2] 1244 [564.3] 1264 [573.3] 1377 [624.6]
All units have grommet compressor mountings, and 1/2" & 1-3/4" electrical knockouts.
Unit Maximum Water
Working Pressure Max Pressure PSIG [kPa]
Base Unit 500 [3445]

Installation, Operation & Maintenance Manual - HBH-HBV Large
9
HBV072-120 Dimensional Data
AIR OUT
AIR OUT AIR OUT
NRP
BLOWER
ROTATION
NRP
NRP
NRP
RETURN AIR
RETURN AIR
BLOWER TO AIR COIL
RELATIONSHIP FOR
REAR OR FRONT
DISCHARGE 072-120
RETURN AIR
UPA
BSP
BSP
2
2
2
3
4
4
5
CSP+CAP+MSP
1
1
1
CSP+CAP+MSP
CSP+CAP+MSP
4
45
7.6
F
L
K
M
SIDE
SERVICE ACCESS
(See Notes 7 and 9)
SERVICE ACCESS
3’ (91 CM)
FRONTAND BACK
1.7
E
FD
F
LEGEND TCV072-096 TCV120
Water Inlet (See Note 2)
Water Outlet (See Note 2)
Condensate Drain (See Note 3)
High Voltage Access (See Note 4)
Low Voltage Access (See Note 4)
1-1/4” FPT
1-1/4” FPT 1-1/2” FPT
1-1/2” FPT
1” FPT
1-3/8” [3.49 CM]
7/8” [2.2 CM]
BSP - Blower Service Panel
CAP - ControlAccess Panel
CSP - CompressorAccess Panel
MSP - Motor Service Panel
NRP - Non Removable Panel
UPA - Upper Pulley Access
1
2
3
4
5
FRONT RETURN REAR DISCHARGE (FR/RD)
REAR RETURN FRONT DISCHARGE (RR/FD)
REAR RETURN TOP DISCHARGE (RR/TD) FRONT RETURN TOP DISCHARGE (FR/TD)
NOTES:
All dimensions in table are inches (cm)
1. While access to all removable panels may not be required, installer should take care to
comply with all building codes and allow adequate clearance for future field service.
2. Water inlet and water outlet connections are factory shipped on the left side. Union allows
field conversion to right side.
3. Condensate drain is available on either side (left or right) of unit. Drain hose and drain
connection will be tied inside the unit. Installer will untie the drain hose, form trap, and
connect to the condensate drain hole of installer’s choice.
4. Electrical access is available on either side (left or right) of unit and is also available in the
front on the left or right side of the unit.
5. Overall width - Add 3.12” (8cm) for 1“ (2.5cm) or 2” (5cm) Filter Frame; or 5.12” (13cm)
for 4” (10.2cm) and for front or rear supply add additional 1.06” (2.7cm) for supply duct
collar.
6. Overall cabinet height dimension does not include duct flange for top discharge
configuration.
7. While access to all removable panels may not be required, installer should take care to
comply with all building codes and allow adequate clearance for future field service.
8. Units require 3 feet(91 cm) clearance, CAP, CSP, MSP and BSP service access.
9. Side service access must be 2 feet (9.4cm) on any side that connections are made.
10. Filter removal is from bottom of frame, allow 2 feet (9.4cm) access for servicing.
BSP UPA
ALL CONFIGURATIONS REQUIRE SERVICE ACCESS AREA
DESCRIBED IN NOTES 7, 8, 9, AND 10.
(See Notes 7 and 8)
(See Notes 7 and 10)
Note 2
ALL CONFIGURATIONS
BLOWER TO AIR COIL
RELATIONSHIP FOR
TOP DISCHARGE
072-120
BSP+MSP
CSP
(See Note 6)
Control
Box
Control
Box
Control
Box
Control
Box
Model
Overall Cabinet Discharge Connection
Duct Flange Water Connections Electric Knockouts
Return Air Connections Using
Return Air Opening
A
B
C
D
E
F
K
L
M
N
O1
O2
P
Q
R
S
T
U
V
Depth
Width
Height
Supply
Width
Supply
Depth
1
Water
Inlet
2
Water
Outlet
3
Con-
densate
Return
Depth
Return
Height
072-120
in.
29.0
41.0
69.8
17.5
14.8
11.9
22.0
7.3
14.5
21.3
8.0
15.0
11.3
1.0
1.5
36.0
36.8
30.6
2.7
cm.
73.7
104.1
177.2
44.5
37.5
30.2
55.9
18.4
36.8
54.0
20.3
38.1
28.6
2.5
3.8
91.4
93.3
77.8
6.9

Installation, Operation & Maintenance Manual - HBH-HBV Large
10
HBV160-240 Dimensional Data
REAR RETURN TOP DISCHARGE (RR/TD)
FRONT RETURN REAR DISCHARGE (FR/RD)
REAR RETURN FRONT DISCHARGE (RR/FD)
FRONT RETURN TOP DISCHARGE (FR/TD)
ALL CONFIGURATIONS REQUIRE SERVICE ACCESS AREA
DESCRIBED IN NOTES 7, 8, 9, AND 10.
ALL CONFIGURATIONS
SIDE SERVICE
ACCESS
(See Notes 7 and 9)
See Notes
7 and 10
SERVICE ACCESS
3’ (91 CM)
FRONTAND BACK
(See Notes 7 and 8)
BLOWER TO AIR COIL
RELATIONSHIP FOR
REAR OR FRONT
DISCHARGE 160-240
NOTES:
All dimensions in table are inches (cm)
1. While access to all removable panels may not be required, installer should take care to
comply with all building codes and allow adequate clearance for future field service.
2. Water inlet and water outlet connections are factory shipped on the left side. Union allows
field conversion to right side.
3. Condensate drain is available on either side (left or right) of unit. Drain hose and drain
connection will be tied inside the unit. Installer will untie the drain hose, form trap, and
connect to the condensate drain hole of installer’s choice.
4. Electrical access is available on either side (left or right) of unit and is also available in the
front on the left or right side of the unit.
5. Overall width - Add 3.12” (8cm) for 1“ (2.5cm) or 2” (5cm) Filter Frame; or 5.12” (13cm)
for 4” (10.2cm) and for front or rear supply add additional 1.06” (2.7cm) for supply duct
collar.
6. Overall cabinet height dimension does not include duct flange for top discharge
configuration.
7. While access to all removable panels may not be required, installer should take care to
comply with all building codes and allow adequate clearance for future field service.
8. Units require 3 feet(91 cm) clearance, CAP, CSP, MSP and BSP service access.
9. Side service access must be 2 feet (9.4cm) on any side that connections are made.
10. Filter removal is from bottom of frame, allow 2 feet (9.4cm) access for servicing.
BLOWER TO AIR COIL
RELATIONSHIP FOR
TOP DISCHARGE
160-240
BLOWER
ROTATION
(See Note 6)
(See Note 5)
Note 2
Model
Overall Cabinet Discharge Connection Duct
Flange Water Connections Electrical Knockouts Return Air Connections Using Return Air Opening
A
Width
B
Depth
C
Height
D
Supply
Width
E
Supply
Depth
F
Supply
Width
G
Supply
Depth
K
Water
Inlet
L
Water
Outlet
M
Conden-
sate
O1 O2 P Q
R S
Return
Depth
T
Return
Height
U V
160-
240
in. 29.0 82.0 69.8 17.5 14.8 17.9 11.5 26.1 3.1 14.5 8.0 15.0 11.3 1.0 1.5 77.0 35.8 31.7 2.6
cm. 73.7 208.3 177.2 44.5 37.5 45.4 29.3 66.3 7.9 36.8 20.3 38.1 28.6 2.5 3.8 195.6 90.8 80.5 6.7
300 in. 29.0 82.0 69.8 17.5 14.8 6.3 8.6 25.7 3.1 14.5 8.0 15.0 11.3 1.0 1.5 77.0 35.8 31.7 2.6
cm. 73.7 208.3 177.2 44.5 37.5 16.0 21.8 26.1 7.9 36.8 20.3 38.1 28.6 2.5 3.8 195.6 90.9 80.5 6.7

Installation, Operation & Maintenance Manual - HBH-HBV Large
11
HBV300 Dimensional Data
REAR RETURN TOP DISCHARGE (RR/TD)
FRONT RETURN REAR DISCHARGE (FR/RD)
REAR RETURN FRONT DISCHARGE (RR/FD)
FRONT RETURN TOP DISCHARGE (FR/TD)
ALL CONFIGURATIONS REQUIRE SERVICE ACCESS AREA
DESCRIBED IN NOTES 7, 8, 9, AND 10.
SIDE SERVICE
ACCESS
(See Notes 7 and 9)
See Notes
7 and 10
SERVICE ACCESS
3’ (91 CM)
FRONTAND BACK
(See Notes 7 and 8)
NOTES:
All dimensions in table are inches (cm)
1. While access to all removable panels may not be required, installer should take care to
comply with all building codes and allow adequate clearance for future field service.
2. Water inlet and water outlet connections are factory shipped on the left side. Union allows
field conversion to right side.
3. Condensate drain is available on either side (left or right) of unit. Drain hose and drain
connection will be tied inside the unit. Installer will untie the drain hose, form trap, and
connect to the condensate drain hole of installer’s choice.
4. Electrical access is available on either side (left or right) of unit and is also available in the
front on the left or right side of the unit.
5. Overall width - Add 3.12” (8cm) for 1“ (2.5cm) or 2” (5cm) Filter Frame; or 5.12” (13cm)
for 4” (10.2cm) and for front or rear supply add additional 1.06” (2.7cm) for supply duct
collar.
6. Overall cabinet height dimension does not include duct flange for top discharge
configuration.
7. While access to all removable panels may not be required, installer should take care to
comply with all building codes and allow adequate clearance for future field service.
8. Units require 3 feet(91 cm) clearance, CAP, CSP, MSP and BSP service access.
9. Side service access must be 2 feet (9.4cm) on any side that connections are made.
10. Filter removal is from bottom of frame, allow 2 feet (9.4cm) access for servicing.
(See Note 5)
ALL CONFIGURATIONS
Note 2
(See Note 6)
BLOWER
ROTATION
BLOWER TO AIR COIL
RELATIONSHIP FOR
TOP DISCHARGE
300
BLOWER TO AIR COIL
RELATIONSHIP FOR
REAR OR FRONT
DISCHARGE 300 ONLY
Model
Overall Cabinet Discharge Connection Duct
Flange Water Connections Electrical Knockouts Return Air Connections Using Return Air Opening
A
Width
B
Depth
C
Height
D
Supply
Width
E
Supply
Depth
F
Supply
Width
G
Supply
Depth
K
Water
Inlet
L
Water
Outlet
M
Conden-
sate
O1 O2 P Q
R S
Return
Depth
T
Return
Height
U V
160-
240
in. 29.0 82.0 69.8 17.5 14.8 17.9 11.5 26.1 3.1 14.5 8.0 15.0 11.3 1.0 1.5 77.0 35.8 31.7 2.6
cm. 73.7 208.3 177.2 44.5 37.5 45.4 29.3 66.3 7.9 36.8 20.3 38.1 28.6 2.5 3.8 195.6 90.8 80.5 6.7
300 in. 29.0 82.0 69.8 17.5 14.8 6.3 8.6 25.7 3.1 14.5 8.0 15.0 11.3 1.0 1.5 77.0 35.8 31.7 2.6
cm. 73.7 208.3 177.2 44.5 37.5 16.0 21.8 26.1 7.9 36.8 20.3 38.1 28.6 2.5 3.8 195.6 90.9 80.5 6.7

Installation, Operation & Maintenance Manual - HBH-HBV Large
Horizontal Installation
Figure 1: Hanger Bracket
Figure 2: Horizontal Unit Pitch
3/8" [10mm] Threaded
Rod (by others)
Vibration Isolator
(factory supplied)
Washer
(by others)
Double Hex Nuts
(by others)
Varilla Roscada de 3/8"
(fabricada por terceros)
Arandela
(fabricada por terceros)
Tuercas Hexagonales
Dobles (por terceros)
Instale los Tornillos como
se Indica en el Diagrama
La longitud de este tornillo
debe ser de solamente 1/2Ó para evitar da–os
Aislador de Vibraciones
(para codificaci—n por color y
notas de instalaci—n, consulte
las instrucciones de
instalaci—n del soport
e colgador)
1/4” (6.4mm) pitch
toward drain for drainage
Drain Connection
Horizontal Unit Location - Units are not designed
for outdoor installation. Locate the unit in an INDOOR
area that allows enough space for service person-
nel 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 freez-
ing 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, elec-
trical, and duct connection(s). Allow 3 feet (91 cm)
clearance for servicing unit through all access panels.
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 engi-
neering 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 and
the removal or installation of the unit itself.
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.
Mounting Horizontal Units - Horizontal units have
hanger kits pre-installed from the factory as shown
in Figure 1. Figure 3 shows a typical horizontal unit
installation.
Horizontal heat pumps are typically suspended above
a ceiling or within a soft using eld supplied, threaded
rods sized to support the weight of the unit.
Use four (4) eld supplied threaded rods and factory
provided vibration isolators to suspend the unit. Hang the
unit clear of the oor slab above and support the unit by
the mounting bracket assemblies only. DO NOT attach
the unit ush with the oor slab above.
Pitch the unit toward the drain as shown in Figure 2 to
improve the condensate drainage.
12

Installation, Operation & Maintenance Manual - HBH-HBV Large
Figure 3: Typical Horizontal Unit Installation
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 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, filter rails are the industry standard and are
included on MARS commercial heat pumps for the purposes
of holding the filter only. For ducted return applications, the
filter rail must be removed and replaced with a duct flange
or filter frame. Canvas or flexible connectors should also be
used to minimize vibration between the unit and ductwork.
(by others)
Thermostat
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
Flexible Duct
Connector
Optional
Balancing Valve
Water Out
Optional Low Pressure Drop Water
Control Valve
(can be internally mounted
on some models)
Stainless steel braid hose
with integral ÒJÓ swivel
Building
Loop
HORIZONTAL INSTALLATION
Figure 3: Typical Horizontal Unit Installation
Water In
Ball valve with optional
integral P/T plug
Unit
Power
CAP CAP
EAP
BSP
CBP
LEFT RETURN STRAIGHT DISCHARGE
CAP
CAP
FRONT
BSP
A
EAP
CBP
BC
O
PQRK
M
F
GE
D
BSP
RIGHT RETURN STRAIGHT DISCHARGE
1
EAP2CAP
CAP 2
FRONT
CBP
15
4
LEGEND
CAP=Compressor Access Panel
CBP=Control Box Panel
BSP=Blower Service Panel
EAP=Expansion Valve Access panel
1=Water Outlet 1-1/4” FPT (072-096) 1-1/2” FPT (120)
2=Water Inlet 1-1/4” FPT (072-096) 1-1/2” FPT (120)
3=Condensate 3/4” FPT
4=High Voltage 1-1/8” [2.9cm] KO
5=Low Voltage 7/8” [2.2cm] KO
HANGER BRACKET DIMENSIONS
87”
[221cm]
1.0”
[2.54cm]
PLAN VIEW
TOP
4.3”
[10.8cm]
34.1”
[86.6cm]
FRONT
CONTROL BOX
U
T
SV
1.3”
[3.3cm]
condensate LEFT RETURN LEFT VIEW-
AIR COIL SIDE
LEFT RETURN END DISCHARGE
CBP
EAP
BSP
CAP
CAP
FRONT
ED
F
G
CAP
CBP
CAP
EAP
BSP
FRONT
FRONT
CONTROL BOX
PLAN VIEW
TOP
VSU
RIGHT RETURN RIGHT VIEW-
AIR COIL SIDE
RIGHT RETURN END DISCHARGE
1.3”
[3.3cm]
condensate drain
3
NOTES:
-All dimensions in table are inches (cm).
1. Access is required for all removable panels and installer should take care to comply with all building codes and allow
adequate clearance for future field service.
2. Water inlet and water outlet connections are available on either side (left or right) of the unit. Qty (2x) MPT Plugs are
shipped loose in a plastic bag tied to the water leg in front of the unit. Installer must plug water inlet/outlet side not being
connected to.
3.Condensate drain is available on end opposite compressor.
4.Electrical access is available on either side (left or right) of the front.
5. Electric box is on right side. It can be field converted to left side. Conversion should only be attempted by qualified
service technician. If electric box relocated to opposite side, and water connected to opposite side, then this access is
not required.
6. Units require 3’ (9.1 cm) clearance for water connections, CAP, CSP, EAP and BSP service access.
7. Overall cabinet width dimensions does not include filter rail and duct flange.
SERVICE ACCESS
3’ (91 cm.)
Note 5, 6
Note 6
Note 6
Note 6
ALL CONFIGURATIONS REQUIRE SERVICE ACCESS AREA
DESCRIBED IN NOTES 5 AND 6.
LEFT RETURN STRAIGHT DISCHARGE
CAP
CAP
FRONT
BSP
A
EAP
CBP
BC
O
PQRK
M
F
GE
D
BSP
RIGHT RETURN STRAIGHT DISCHARGE
1
EAP2CAP
CAP 2
FRONT
CBP
15
4
LEGEND
CAP=Compressor Access Panel
CBP=Control Box Panel
BSP=Blower Service Panel
EAP=Expansion Valve Access panel
1=Water Outlet 1-1/4” FPT (072-096) 1-1/2” FPT (120)
2=Water Inlet 1-1/4” FPT (072-096) 1-1/2” FPT (120)
3=Condensate 3/4” FPT
4=High Voltage 1-1/8” [2.9cm] KO
5=Low Voltage 7/8” [2.2cm] KO
HANGER BRACKET DIMENSIONS
87”
[221cm]
1.0”
[2.54cm]
PLAN VIEW
TOP
4.3”
[10.8cm]
34.1”
[86.6cm]
FRONT
CONTROL BOX
U
T
SV
1.3”
[3.3cm]
condensate LEFT RETURN LEFT VIEW-
AIR COIL SIDE
LEFT RETURN END DISCHARGE
CBP
EAP
BSP
CAP
CAP
FRONT
ED
F
G
CAP
CBP
CAP
EAP
BSP
FRONT
FRONT
CONTROL BOX
PLAN VIEW
TOP
VSU
RIGHT RETURN RIGHT VIEW-
AIR COIL SIDE
RIGHT RETURN END DISCHARGE
1.3”
[3.3cm]
condensate drain
3
NOTES:
-All dimensions in table are inches (cm).
1. Access is required for all removable panels and installer should take care to comply with all building codes and allow
adequate clearance for future field service.
2. Water inlet and water outlet connections are available on either side (left or right) of the unit. Qty (2x) MPT Plugs are
shipped loose in a plastic bag tied to the water leg in front of the unit. Installer must plug water inlet/outlet side not being
connected to.
3.Condensate drain is available on end opposite compressor.
4.Electrical access is available on either side (left or right) of the front.
5. Electric box is on right side. It can be field converted to left side. Conversion should only be attempted by qualified
service technician. If electric box relocated to opposite side, and water connected to opposite side, then this access is
not required.
6. Units require 3’ (9.1 cm) clearance for water connections, CAP, CSP, EAP and BSP service access.
7. Overall cabinet width dimensions does not include filter rail and duct flange.
SERVICE ACCESS
3’ (91 cm.)
Note 5, 6
Note 6
Note 6
Note 6
ALL CONFIGURATIONS REQUIRE SERVICE ACCESS AREA
DESCRIBED IN NOTES 5 AND 6.
13

Installation, Operation & Maintenance Manual - HBH-HBV Large
HBH Field Conversion of Air Discharge
Overview - Horizontal units can be eld converted
between straight (side) and back (end) discharge using
the instructions below.
Note: It is not possible to field convert return
air between left or right return models due to
the necessity of refrigeration copper piping
changes.
Preparation - Field conversion must be completed on
the ground. If the unit is already hung it should be taken
down for the eld conversion. Place in a well-lighted area.
Conversion should only be attempted by a qualied service
technician.
Side to Back Discharge Conversion
1. Remove back panel and side access panel
2. Loosen 2 motor slide nuts, raise motor slide assembly
and remove belt and motor sheave.
3. Remove blower sheave. Remove motor bolts and
carefully remove motor.
4. Remove 2 motor clips and reattach to opposite side.
5. Unbolt (3 per side) complete housing assembly.
6. Rotate complete assembly into new position. Locate
over mounting holes in base, reattach using 3 bolts per
side.
7. Mount motor, motor sheave, blower sheave and belt.
Make sure wires are not pinched and not over sharp
edges. Adjust motor downward to tighten belt. Raise
or lower motor slide assembly with adjusting bolt and
retighten 2 slide nuts. Check for correct tension (See
Tensioning V-Belt Drives page). Rewire motor (at
contactor) for correct rotation. Spin blower wheel to
ensure wheel is not obstructed.
8. Replace 2 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.
WARNING!
Step 1
Step 2
Step 3
Step 4
Move motor clips to
other side on bracket
Remove motor
and blower sheave
Loosen 2 motor slide nuts, raise
slide assembly, remove belt.
Remove blower panel
and access panel
Remove (3x) per slide
1/4-20 UNC bolts
Return air
Step 5
Step 6
Rotate entire blower housing ASM to rest at back end of the unit. Locate
housing holes and bolt down using previous 1/4-20 UNC bolts (3x) ea. side.
Motor motor, motor sheave,
blower sheave and belt
Step 7
Step 8
Put blower panel
and access panel back on
Front
Return air
Front
Return air
Adjusting bolt - used
to raise or lower motor
slide assembly.
Remove 4
motor bolts
Step 1
Step 2
Step 3
Step 4
Move motor clips to
other side on bracket
Remove motor
and blower sheave
Loosen 2 motor slide nuts, raise
slide assembly, remove belt.
Remove blower panel
and access panel
Remove (3x) per slide
1/4-20 UNC bolts
Return air
Step 5
Step 6
Rotate entire blower housing ASM to rest at back end of the unit. Locate
housing holes and bolt down using previous 1/4-20 UNC bolts (3x) ea. side.
Motor motor, motor sheave,
blower sheave and belt
Step 7
Step 8
Put blower panel
and access panel back on
Front
Return air
Front
Return air
Adjusting bolt - used
to raise or lower motor
slide assembly.
Remove 4
motor bolts
Figure 4: Left Return Side Discharge to Back
Figure 4 Continued on Following Page
Step 1
Step 2
Step 3
Step 4
Move motor clips to
other side on bracket
Remove motor
and blower sheave
Loosen 2 motor slide nuts, raise
slide assembly, remove belt.
Remove blower panel
and access panel
Remove (3x) per slide
1/4-20 UNC bolts
Return air
Step 5
Step 6
Rotate entire blower housing ASM to rest at back end of the unit. Locate
housing holes and bolt down using previous 1/4-20 UNC bolts (3x) ea. side.
Motor motor, motor sheave,
blower sheave and belt
Step 7
Step 8
Put blower panel
and access panel back on
Front
Return air
Front
Return air
Adjusting bolt - used
to raise or lower motor
slide assembly.
Remove 4
motor bolts
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 or
conversion.
14

Installation, Operation & Maintenance Manual - HBH-HBV Large
Step 1
Step 2
Step 3
Step 4
Move motor clips to
other side on bracket
Remove motor
and blower sheave
Loosen 2 motor slide nuts, raise
slide assembly, remove belt.
Remove blower panel
and access panel
Remove (3x) per slide
1/4-20 UNC bolts
Return air
Step 5
Step 6
Rotate entire blower housing ASM to rest at back end of the unit. Locate
housing holes and bolt down using previous 1/4-20 UNC bolts (3x) ea. side.
Motor motor, motor sheave,
blower sheave and belt
Step 7
Step 8
Put blower panel
and access panel back on
Front
Return air
Front
Return air
Adjusting bolt - used
to raise or lower motor
slide assembly.
Remove 4
motor bolts
Step 1
Step 2
Step 3
Step 4
Move motor clips to
other side on bracket
Remove motor
and blower sheave
Loosen 2 motor slide nuts, raise
slide assembly, remove belt.
Remove blower panel
and access panel
Remove (3x) per slide
1/4-20 UNC bolts
Return air
Step 5
Step 6
Rotate entire blower housing ASM to rest at back end of the unit. Locate
housing holes and bolt down using previous 1/4-20 UNC bolts (3x) ea. side.
Motor motor, motor sheave,
blower sheave and belt
Step 7
Step 8
Put blower panel
and access panel back on
Front
Return air
Front
Return air
Adjusting bolt - used
to raise or lower motor
slide assembly.
Remove 4
motor bolts
Step 1
Step 2
Step 3
Step 4
Move motor clips to
other side on bracket
Remove motor
and blower sheave
Loosen 2 motor slide nuts, raise
slide assembly, remove belt.
Remove blower panel
and access panel
Remove (3x) per slide
1/4-20 UNC bolts
Return air
Step 5
Step 6
Rotate entire blower housing ASM to rest at back end of the unit. Locate
housing holes and bolt down using previous 1/4-20 UNC bolts (3x) ea. side.
Motor motor, motor sheave,
blower sheave and belt
Step 7
Step 8
Put blower panel
and access panel back on
Front
Return air
Front
Return air
Adjusting bolt - used
to raise or lower motor
slide assembly.
Remove 4
motor bolts
Step 1
Step 2
Step 3
Step 4
Move motor clips to
other side on bracket
Remove motor
and blower sheave
Loosen 2 motor slide nuts, raise
slide assembly, remove belt.
Remove blower panel
and access panel
Remove (3x) per slide
1/4-20 UNC bolts
Return air
Step 5
Step 6
Rotate entire blower housing ASM to rest at back end of the unit. Locate
housing holes and bolt down using previous 1/4-20 UNC bolts (3x) ea. side.
Motor motor, motor sheave,
blower sheave and belt
Step 7
Step 8
Put blower panel
and access panel back on
Front
Return air
Front
Return air
Adjusting bolt - used
to raise or lower motor
slide assembly.
Remove 4
motor bolts
Figure 4 Continued: Left Return Side Discharge to Back
Step 1
Step 2
Step 3
Step 4
Move motor clips to
other side on bracket
Remove motor
and blower sheave
Loosen 2 motor slide nuts, raise
slide assembly, remove belt.
Remove blower panel
and access panel
Remove (3x) per slide
1/4-20 UNC bolts
Return air
Step 5
Step 6
Rotate entire blower housing ASM to rest at back end of the unit. Locate
housing holes and bolt down using previous 1/4-20 UNC bolts (3x) ea. side.
Motor motor, motor sheave,
blower sheave and belt
Step 7
Step 8
Put blower panel
and access panel back on
Front
Return air
Front
Return air
Adjusting bolt - used
to raise or lower motor
slide assembly.
Remove 4
motor bolts
15

Installation, Operation & Maintenance Manual - HBH-HBV Large
2”
1.5”
1.5”
* Some units include a painted drain connection.
Using a threaded pipe or similar device to clear
any excess paint accumulated inside this fitting
may ease final drain line installation.
1/8” Per
Foot
Horizontal Installation
Figure 6: Horizontal Condensate Connection
CAUTION! Ensure condensate line is pitched toward drain
1/8 inch per ft [11mm per m] of run.
CAUTION!
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.
DUCT SYSTEM INSTALLATION
Condensate Piping
Duct System Installation
Horizontal Units Condensate Piping - Pitch the
unit toward the drain as shown in Figure 2 to improve
the condensate drainage. 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.
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.
Figure 5: Right Return Side Discharge to Back
RIGHT RETURN SIDE DISCHARGE
CBP
Drain
FRONT
CBP
FRONT
RIGHT RETURN END DISCHARGE
RETURN AIR
Drain
RETURN AIR
16

Installation, Operation & Maintenance Manual - HBH-HBV Large
Vertical Location and Access
HB units are not designed for outdoor installation. Locate
the unit in an indoor area that allows enough space for
installation and for service personnel to perform typical
maintenance or repairs. HB units are typically installed in
a oor level closet or in a small mechanical room. Refer
to Figure 7 for an illustration of a typical installation.
Install units with adequate clearance to allow mainte-
nance and servicing. Conform to the following guidelines
when selecting unit location:
•Provide adequate clearance for filter replacement and
drain pan cleaning. DO NOT block filter access with
piping, conduit or other materials. Refer to submittal
drawing for Vertical Unit Dimensions.
•Provide access for fan and fan motor maintenance
and for servicing of the compressor and coils without
removal of the unit.
•Provide an unobstructed path to the unit within the
closet or mechanical room to enable removal of the
unit if necessary.
•Provide access to water valves and fittings, and
screwdriver access to the unit side panels, discharge
collar and all electrical connections
Figure 7: Typical Vertical Installation
Duct System Design & Installation Guidelines
The following application guidelines must be used
when installing HB units. Failure to follow these guide-
lines could result in unsatisfactory unit performance
and/or premature failure of some unit components.
MARS will not warrant, or accept responsibility for
products which fail, have defects, damage or insuf-
cient performance as a result of improper application.
•The duct system must be sized to handle the
airflow quietly and must not exceed the maximum
allowable External Static Pressure. To maximize
sound attenuation metal supply and return ducts
should include internal insulation or be of duct board
construction for the first 10 feet or end of first full-sized
elbow.
•Install a flexible connector in all supply and return
air ducts close to the unit to inhibit sound transfer to
the ducts.
•Do not install uninsulated duct in an unconditioned
space. The unit performance will be adversely affected
and damage from condensate can occur.
Vertical Installation
Control
Box
Supply
Air
Supply
Air
Rear Return/Top Discharge shown
Refer to Dimensional Data pages for
other arrangements & dimensions
Ductwork not shown.
All components external
of unit are field supplied.
Return Air
Return Air
24 V Remote
Thermostat
Disconnect Box
Per NEC and
Local Codes
Plug water
in and out
connections
Water
In
Optional
Balancing
Valve
Return
Water
Supply
Water
Shutoff
Unions Hoses
Optional
To
Drain
Water
Out
Condensate Internally
Trapped. Do not trap externally.
Pitch horizontal runs ¼” per foot.
(See Figure
10 for Vent)
17

Installation, Operation & Maintenance Manual - HBH-HBV Large
HBV Field Conversion of Air Discharge
Overview - Vertical units can be field converted between
top and straight (side) and back (end) discharge using the
instructions below.
Preparation - Place in a well-lighted area. Conversion should
only be attempted by qualified service technicians.
WARNING!
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 or
conversion.
18

Installation, Operation & Maintenance Manual - HBH-HBV Large
HBV072-240 Field Conversion of Air Discharge
Figure 8: HBV072 - 120 and HBV160-240 Pictorally Shown Top Discharge Steps
to Convert to Straight Discharge
Step 1 - For TCV072-120 remove 3 panels.
For TCV160-240 remove 6 panels, middle
dividers, and panel mounting brackets.
Step 1 - For HBV072-120 remote 3 panels.
For HBV160-240 remove 6 panels, middle
dividers, and panel mounting brackets.
19

Installation, Operation & Maintenance Manual - HBH-HBV Large
HBV072-240 Field Conversion of Air Discharge
Step 2 - Remove motor and then unscrew and
remove motor mount assembly. Put motor
mount assembly back in lower mount position.
(2X) Bolts
(2X) Bolts
Upper Mount
Holes for Top
Discharge
Lower Mount
Holes for
Straight
Discharge
20