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Step 4 — Mounting the Unit
HORIZONTAL UNITS (50RHC,RHR,RHS) — Horizontal units
should be mounted using the factory-installed hangers. Proper
attachment of hanging rods to building structure is critical for
safety. See Fig. 4 and 13. Rod attachments must be able to sup-
port the weight of the unit. See Tables 1-3 for unit operating
weights.
VERTICAL UNITS (50RVC,RVR,RVS,RDS) — Vertical and
downflow units are available in left or right return air configu-
rations. See Fig. 6-8. Mount the unit (except 50RDS) on a
vibration absorption pad slightly larger than the entire base to
minimize vibration transmission. It is not necessary to mount
the unit on the floor. See Fig. 14.
NOTE: Some codes require the use of a secondary drain pan
under vertical units. Check local codes for more information.
Step 5 — Duct System — Size the duct system to han-
dle the design airflow quietly.
NOTE: Depending on the unit, the fan wheel may have a ship-
ping support installed at the factory. This must be removed
before operating unit.
SOUND ATTENUATION — To eliminate the transfer of
vibration to the duct system, a flexible connector is recom-
mended for both discharge and return air duct connections on
metal duct systems. The supply and return plenums should in-
clude internal duct liner of fiberglass or be made of duct board
construction to maximize sound attenuation of the blower.
Installing the WSHP unit to uninsulated ductwork in an uncon-
ditioned space is not recommended since it will sweat and
adversely affect the unit’s performance.
To reduce air noise, at least one 90-degree elbow could be
included in the supply and return air ducts, provided system
performance is not adversely impacted. The blower speed can
also be changed in the field to reduce air noise or excessive air-
flow, provided system performance is not adversely impacted.
EXISTING DUCT SYSTEM — If the unit is connected to
existing ductwork, consider the following:
• Verify that the existing ducts have the proper capacity to
handle the unit airflow. If the ductwork is too small,
install larger ductwork.
• Check existing ductwork for leaks and repair as
necessary.
NOTE: Local codes may require ventilation air to enter the
space for proper indoor air quality. Hard-duct ventilation may
be required for the ventilating air supply. If hard ducted venti-
lation is not required, be sure that a proper air path is provided
for ventilation air to unit to meet ventilation requirement of the
space.
Water
Connection End
Supply
Duct
Return Air
Water
Connection End
Drain
Return Air
Discharge Air
Side Discharge
Back Discharge
Fig. 12 — Conversion Right Return,
Side Discharge to Back Discharge
Compressor
Section
Air Handler
Section
B
A
C
E
D
D
Fig. 13 — Horizontal Hanger Bracket
(Factory Installed)
50RHC UNITS
DIMENSIONS (in.)
ABC
006-012 16.9 34.1 21.1
018-030 18 43.1 22.2
036,042 18 47.1 22.2
048,060 22 54.1 26.2
50RHR UNITS
DIMENSIONS (in.)
ABCDE
006-024 22.375 43.1 24.375 43.1 20.375
030,036 22.375 52.1 24.375 52.1 20.375
042,048 22.375 61.1 24.375 61.1 20.375
060 25.375 71.1 27.375 71.1 23.375
50RHS UNITS
DIMENSIONS (in.)
ABCDE
015,018 22.375 51 24.375 53 20.375
024-036 22.375 61 24.375 63 20.375
042,048 25.375 70 27.375 72 20.375
060 25.375 75 27.375 77 23.375
070 25.375 80 27.375 82 23.375
Vibration
Absorption
Pad
Fig. 14 — 50RVC,RVR,RVS Units Mounted With
Vibration Absorption Pad