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5.
6.
7.
8.
Water
Connection
End
Check refrigerant
mbmg for contact with other compo-
nents. Adjust if necessary.
Reinstall top panel using screws set aside in Step 1.
NOTE:
Location
for some screws at bottom of discharge
panel may have to be changed.
Manually
spin fan wheel
to check
for obstructions.
Adjust for any obstruction
found.
Replace access panel.
Remove
Screws
Return Air
Side
Discharge
Rotate
Water
Connection End
\\
Move to Side
Replace Screws
Return Air
j
Drain
/
Back
Discharge
Discharge Air
Fig. 8 -- Conversion Left Return,
Side Discharge to Back Discharge
Back to Side Discharge
Conversion
--
Follow
instructions
above
for Side to Back Discharge
Conversion,
noting
the
panels would be reversed.
Step 4 E Mount the Unit
HORIZONTAL
UNIT (50PTH)
-- 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. 1. Rod attactnnents
must be able to support the weight
of the unit. See Table 1 for unit operating
weights.
VERTICAL
UNITS
(50PTV, PTD) -- Vertical
and downflow
units are available in left or right return air configurations.
See
Fig. 3 and 4. Mount
the unit (except 50PTD) on a vibration
absorption pad slightly larger than the entire base to minhnize
vibration transmission.
It is not necessary
to mount the unit on
the floor. See Fig. 9.
NOTE:
Some codes require the use of a secondary
drain pan
under vertical units. Check local codes for more information.
/
Isolation Pad
Insulated
Sound Baffle
(Open Both Ends and Bottom)
Return Air Louver or Gdlle
Fig. 9 -- 50PTV
Units Mounted
With
Vibration
Absorption
Pad
Step 5 E Check Duct System
_
Size the duct sys-
tem 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 recolmnended
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 ventilation
is not required,
be sure that a proper air
path is provided
for ventilation
air to unit to meet ventila-
tion requirement
of the space.
Step 6 _ Install Condensate
Drain
HORIZONTAL
UNIT
(50PTH) --
Slope the unit toward the
drain at 1/4 in. See Fig. 10. If it is not possible to meet the re-
quired pitch, install a condensate
at the unit to pump conden-
sate to buildmg dram.
Horizontal
units are not internally trapped, therefore an ex-
ternal trap is necessary. Install each unit with its own individual
trap and means to flush or blow out the condensate
drain line.
Do not install units with a colrnnon trap or vent. See Fig. 11 for
typical condensate
connections.
NOTE: Never use a pipe size smaller than the connection.
VERTICAL
UNITS
(50PTV, PTD)-
Each unit uses a con-
densate hose inside all cabinets as a trapping loop, therefore an
external trap is not necessary.
See Fig. 12.
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