Operating instructions

9
If using the Over/Under Transition Kit, the filter(s) may be located
in the return air duct(s) or return air filter grille(s). Filters installed
external to the unit should be sized in accordance with their
manufacturer recommendations. A throwaway filter must be
sized for a maximum face velocity of 300 feet per minute.
FILTER INSTALLATION
Important: When installing a filter, the air flow arrows on the
filter must point toward the circulator blower.
VENTING
NOTE: Venting is self-contained. Do not modify or block.
FLUE HOOD AND AIR INLET HOOD INSTALLATION
Install the flue hood and air inlet hood prior to operation of the
unit.
To install the flue hood cover:
1. Remove the flue hood and bug screen from inside the
compressor compartment.
2. Attach the flue hood (enclosed side down) and screen with
the sheet metal screw provided.
To install the air inlet hood:
1. Remove hood from the compressor compartment.
2. Attach hood by using the supplied sheet metal screws.
Flue Hood
Air Intake Hood
Screen
Hood Installation
CONDENSATE DRAIN
HIGH STATIC OR DOWN-DISCHARGE INSTALLATION
IMPORTANT: Elevated internal static pressure can cause
condensate to be drawn out of the drain pan and into the return air
plenum. For gas package units and down discharge installations
experiencing total external pressure of 0.30” w.c. or greater, add a
splash baffle. It will prevent condensate from seeping over into the
return air plenum in high static applications. The baffles are factory
installed in all large chassis gas/electric package units. Contact your
distributor for the correct splash baffle for your model.
CONDENSATE DRAIN CONNECTION
These units are equipped with a built-in trap and do not require
an external trap.
To avoid double trapping and an overflowing drain pan, soft
plastic drain lines are not recommended.
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 No. 90A and 90B.
The warm air supply duct from the unit through a wall fabricated
of combustible material may be installed without clearance.
However, minimum clearances for the unit must be observed
as shown in the Minimum Clearances for Unit figure on page 4.
The outlet duct should be provided with an access panel. This
access should be large enough to inspect the air chamber
downstream from the heat exchanger for any smoke or
combustion gas leaks. A cover should be tightly attached to
prevent air leaks.
For horizontal airflow, duct flange dimensions on the unit are
shown in the Product Data Book applicable to your model*.
For vertical airflow, 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
CAUTION
T
O 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.
Even though a return air filter is not supplied with this unit, there
must be a means of filtering all return air.
Refer to the following table for filter size information.
Mod el
Disposable
Filter
ft
2*
Permanent
Filter
ft
2**
Rated Cooling
Airflow
CFM
PGA24C***2(E/F) 3.8 1.9 800
PGA30C***2(E/F) 3.8 1.9 1000
PGA36C***2(E/F) 4.0 2.0 1200
PGA42C***2(E/F) 4.5 2.3 1350
PGA48C***2(E/F) 5.3 2.7 1600
PGA60C***2(E/F) 5.8 2.9 1750
PGB24C***2(E/F) 3.0 1.5 800
PGB30C***2(E/F) 3.5 1.8 1000
PGB36C***2(E/F) 4.0 2.0 1150
PGC42C***2(E/F) 4.5 2.3 1350
PGB42C***2(E/F) 5.0 2.5 1400
PGB48C***2(E/F) 5.5 2.8 1600
PGB60C***2(E/F) 7.0 3.5 2000
PGD24C***2(E/F) 3.0 1.5 800
PGD30C***2(E/F) 3.5 1.8 1000
PGD36C***2(E/F) 4.0 2.0 1150
PGD42C***2(E/F) 4.5 2.3 1350
PGD48C***2(E/F) 5.0 2.5 1500
PGD60C***2(E/F) 6.0 3.0 1750
*Based on a face velocity of 300ft/min.
**Based on a face velocity of 600 ft/min.