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PROTECTION — Once the units are properly positioned on
the jobsite, they must be covered with either a shipping carton,
vinyl film, or an equivalent protective covering. Open ends of
pipes stored on the jobsite must be capped. This precaution is
especially important in areas where painting, plastering, or
spraying of fireproof material, etc. is not yet complete. Foreign
material that is allowed to accumulate within the units can pre-
vent proper start-up and necessitate costly clean-up operations.
Before installing any of the system components, be sure to
examine each pipe, fitting, and valve, and remove any dirt or
foreign material found in or on these components.
INSPECT UNIT — To prepare the unit for installation, com-
plete the procedures listed below:
1. Compare the electrical data on the unit nameplate with
ordering and shipping information to verify that the
correct unit has been shipped.
2. Do not remove the packaging until the unit is ready for
installation.
3. Verify that the unit’s refrigerant tubing is free of kinks or
dents, and that it does not touch other unit components.
4. Inspect all electrical connections. Be sure connections are
clean and tight at their terminations.
5. Loosen compressor bolts until the compressor rides freely
on springs. Remove shipping restraints.
6. Remove the four
1
/
4
in. shipping bolts from compressor
support plate (two bolts on each side) to maximize vibra-
tion and sound alternation.
7. Remove any blower support cardboard from inlet of the
blower.
8. Locate and verify any accessory kit located in compressor
and/or blower section.
9. Remove any access panel screws that may be difficult to
remove once unit is installed.
Step 3 — Location of Unit —
The following guide-
lines should be considered when choosing a location for a
WSHP:
• Units are for indoor use only.
• Locate in areas where ambient temperatures are between
40 F and 100 F and relative humidity is no greater than
75%.
• Provide sufficient space for water, electrical and duct
connections.
• Locate unit in an area that allows for easy access and
removal of filter and access panels.
• Allow enough space for service personnel to perform
maintenance.
• Provisions must be made for return air to freely enter the
space if unit needs to be installed in a confined area such
as a closet.
NOTE: Correct placement of the horizontal unit can play an
important part in minimizing sound problems. Since duct-
work is normally applied to these units, the unit can be placed
so that the principal sound emission is outside the occupied
space in sound-critical applications. A fire damper may be re-
quired by the local code if a fire wall is penetrated.
Step 4 — Mounting the Unit
HORIZONTAL UNITS (50HQL) — Horizontal units should
be mounted using the factory-installed hangers. Proper attach-
ment of hanging rods to building structure is critical for safety.
See Fig. 2. Rod attachments must be able to support the weight
of the unit. See Table 1 for unit operating weights.
VERTICAL UNITS (50VQL) — Vertical units are available in
rear or front return air configurations.
Sound minimization is achieved by enclosing the unit with-
in 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 degrees to
the return air grille. Install a sound baffle to reduce line-
of-sight sound transmitted through return air grilles.
2. Mount the unit on a rubber or neoprene pad to minimize
vibration transmission to the building structure. Extend
the pad beyond all four edges of the unit.
NOTE: Some codes require the use of a secondary drain pan
under vertical units. Check local codes for more information.
Step 5 — Duct System —
The duct system should be
sized to handle 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
be also 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,
larger ductwork should be installed.
• 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.
DO NOT store or install units in corrosive environments or
in locations subject to temperature or humidity extremes
(e.g., attics, garages, rooftops, etc.). Corrosive conditions
and high temperature or humidity can significantly reduce
performance, reliability, and service life. Always move
units in an upright position. Tilting units on their sides may
cause equipment damage.
Failure to remove shipping brackets from spring-mounted
compressors will cause excessive noise and could cause
component failure due to added vibration.
