GPH14M Installation Manual

5
Roof Curb Installation
RIGGING DETAILS
WARNING
T
O PREVENT PROPERTY DAMAGE, THE UNIT SHOULD REMAIN IN AN UPRIGHT
POSITION DURING ALL RIGGING AND MOVING OPERATIONS.
T
O FACILITATE
LIFTING AND MOVING WHEN A CRANE IS USED, PLACE THE UNIT IN AN
ADEQUATE CABLE SLING.
WARNING
T
O AVOID POSSIBLE 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
T
O AVOID POSSIBLE PERSONAL INJURY, A SAFE, FLAT SURFACE FOR SERVICE
PERSONNEL SHOULD BE PROVIDED.
IMPORTANT: If using bottom discharge with roof curb, duct work
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 C ONVERSION
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 air flow.
Horizontal Air Flow
Single phase models are shipped without horizontal duct
covers. If needed, these kits may be ordered through
Goodman’s Service Parts department.
Remove these covers
for horizontal duct
applications
Remove these panels
for downflow duct
applications
Supply
Return
Duct Cover Installation
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: Single phase models require installation of horizontal duct
kit #20464501PDGK (medium chassis) and #20464502PDGK
(large chassis).
DUCT WORK
Duct systems and register sizes must be properly designed for
the C.F.M. and external static pressure rating of the unit. Duct work
should be designed in accordance with the recommended meth-
ods of Air Conditioning Contractors of America Manual D (Resi-
dential) or Manual Q (Commercial). All ductwork exposed to the
outdoors must include a weatherproof barrier and adequate insu-
lation.