Whirlpool WGPH45 AM Installation Manual download pdf (Page 6)

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

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.

Horizontal Airflow

Single-phase models are shipped without horizontal duct covers.

If needed, these kits maybe ordered through the your local dealer

or see “Assistance and Service.”

Duct Cover Installations—Down-Discharge

Remove the panels for down-discharge duct applications.

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.

Filters

Filters are not provided with unit and must be supplied and

externally installed in the return duct system by the installer. An

optional factory-approved internal filter rack may also be used. A

field-installed filter grille is recommended for easy and

convenient access to the filters for periodic inspection and

cleaning. When installing filters, ensure the airflow arrows on the

filter are pointing toward the circulator blower.

Refer to the following unit filter size chart for filter size

information.

A. Supply air panel

B. Return air panel

Minimum Filter Size

Nominal Size—in. (cm) Nominal Area—sq ft (cm

)

10 x 20 (25.4 x 50.8) 1.4 (1,301)

14 x 20 (35.6 x 50.8) 1.9 (1,765)

14 x 25 (35.6 x 63.5) 2.4 (2,230)

15 x 20 (38.1 x 50.8) 2.1 (1,951)

16 x 20 (40.6 x 50.8) 2.2 (2,044)

16 x 25 (40.6 x 63.5) 2.8 (2,601)

20 x 20 (50.8 x 50.8) 2.8 (2,601)

20 x 25 (50.8 x 63.5) 3.5 (3,252)

25 x 25 (63.5 x 63.5) 4.3 (3,995)

To prevent property damage due to fire and loss of

equipment efficiency or equipment damage due to dust

and lint build up on internal parts, never operate unit

without an air filter installed in the return air system.

CAUTION

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Whirlpool WGPH45 AM Installation Manual Page 6

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