Rigging Details; Circulating Air And Filters; Airflow Conversion; Ductwork - Whirlpool Gold WPH43M Installation Instructions Manual

Rigging Details

WARNING
To prevent property damage, the unit should remain in an
upright position during all rigging and moving operations.
To facilitate lifting and moving when a crane is used,
place the unit in an adequate cable sling.
WARNING
To prevent property damage, personal injury or death,
ensure the roof has sufficient structural strength to carry
the weight of the unit(s), roof curb, snow loads and water
loads as required by local codes. Consult a structural
engineer to determine the weight capabilities of the roof.
CAUTION
To avoid possible personal injury, a safe, flat surface for
service personnel should be provided.
IMPORTANT: If you are using bottom discharge with roof curb,
ductwork should be attached to the curb prior to installing the
unit. Lower unit carefully onto roof mounting curb. While rigging
unit, center of gravity will cause condenser end to be lower than
supply air end.
Rigging

CIRCULATING AIR AND FILTERS

Airflow Conversion

Units can easily be converted from horizontal to down-discharge
airflow delivery. In down-discharge or high-static installations, the
installer should measure the total external static and review the
blower performance charts before performing the installation. In
some installations, it will be necessary to change the blower
speed to provide proper airflow.
Duct Cover Installations—Down-Discharge
Remove the panels for down-discharge duct applications.
A. Supply air panel
B. Return air panel
Down-Discharge Applications
Cut insulation around bottom openings and remove panels from
the bottom of the unit, saving the screws holding the panels in
place.
NOTE: Down-discharge models require installation of horizontal
duct kit Number 20464501PDGK (medium chassis) and Number
20464502PDGK (large chassis).

Ductwork

Duct systems and register sizes must be properly designed for
the C.F.M. and external static pressure rating of the unit.
Ductwork should be designed in accordance with the
recommended methods of Air Conditioning Contractors of
America Manual D (Residential) or Manual Q (Commercial).
All ductwork exposed to the outdoors must include a
weatherproof barrier and adequate insulation. A duct system
should be installed in accordance with Standards of the National
Board of Fire Underwriters for the Installation of Air Conditioning,
Warm Air Heating and Ventilating Systems. Pamphlets Number
90A and 90B.
The supply duct from the unit through a wall may be installed
without clearance. However, minimum unit clearances must be
maintained. The supply duct should be provided with an access
panel large enough to inspect the air chamber downstream of the
heat exchanger. A cover should be tightly attached to prevent air
leaks.
For duct flange dimensions on the unit, refer to the Unit
Dimension illustration in the appendix.
For down-discharge applications, the ductwork should be
attached to the roof curb prior to installing the unit. Ductwork
dimensions are shown in the roof curb installation manual.
If desired, supply and return duct connections to the unit may be
made with flexible connections to reduce possible unit operating
sound transmission.
B
A
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