GPG16M Installation Instructions

ROOFTOP INSTALLATIONS ONLY:

NOTE: To ensure proper condensate drainage, unit must be installed in a level position.

• To avoid possible property damage or personal injury, the roof must have sufficient

structural strength to carry the weight of the unit(s) and snow or water loads as required

by local codes. Consult a structural engineer to determine the weight capabilities of the

roof.

• The unit may be installed directly on wood floors or on Class A, Class B, or Class C roof

covering material.

• To avoid possible personal injury, a safe, flat surface for service personnel should be

provided.

ROOF CURB INSTALLATIONS ONLY:

• Sufficient structural support must be determined prior to locating and mounting the

curb and package unit.

• Ductwork must be constructed using industry guidelines. The duct work must be placed

into the roof curb before mounting the package unit.

• Curb insulation, cant strips, flashing and general roofing material are furnished by the

contractor.

RIGGING DETAILS

IMPORTANT NOTE: If using bottom discharge with roof curb, ductwork should

be attached to the curb prior to installing the unit. Ductwork dimensions are

shown in roof curb installation instructions.

Refer to the Roof Curb Installation Instructions for proper curb installation.

Curbing must be installed in compliance with the National Roofing Contractors

Association Manual.

Lower unit carefully onto roof mounting curb. While rigging unit, center of

gravity will cause condenser end to be lower than supply air end.

GAS PIPING

IMPORTANT NOTE: This unit is factory set to operate on natural gas at the

altitudes shown on the rating plate.

The rating plate is stamped with the model number, type of gas and

gas input rating. Make sure the unit is equipped to operate on the

type of gas available. Conversion to LP gas is permitted with the use

of a factory authorized conversion kit. Contact your distributor or

refer to the specification sheet for your model for a listing of ap-

proved LP gas conversion kit(s). Refer to the Installation Manual pro-

vided with the LP kit for conversion from natural gas to propane gas.

The minimum supply pressure should not vary from that shown in the

Inlet Gas Pressure table because this could prevent the unit from

having dependable ignition. In addition, gas input to the burners must not exceed the rated input shown on the rating plate. Overfiring

of the unit could result in premature heat exchanger failure.

Rigging

Natural Min. 5.0" W.C., Max. 10.0" W.C.

Propane Min. 11.0" W.C., Max. 13.0" W.C.

INLET GAS PRESSURE

Inlet Gas Pressure Must Not Exceed the Maximum Value Shown in Table

Above.

Roof Curb Installation