AIR HANDLING SUB-SYSTEM
Filter
(-)GRA/(-)GTA units come with a low
pressure drop permanent filter made
of thermoplastic material. It has been
ASHRAE evaluated for dust spot and
dust holding capacity. The filter must
be cleaned at regular intervals for
proper furnace operation.
Blower Motor
All units come with three, or four,
speed direct drive blowers capable of
moving air for heating and cooling.
The PSC motor operates on the
appropriate speed when the owner
switches the thermostat to heating
or cooling. The 45,000 BTUH and
60,000 BTUH units come with
1/2 horsepower motors. The 90,000
BTUH, 105,000 BTUH, and 120,000
BTUH units use a 3/4 horsepower
motor. 75,000 BTUH units can be
ordered with either a 1/2 or 3/4
horsepower motor. All motors are
permanently lubricated.
Blower Motor Capacitor
Each motor uses a 1-3/4 inch run
capacitor mounted to the side of the
blower housing. The 1/2 HP motors
use a 370 volt, 7 -1 /2 mfd capacitor
and the 3/4 HP motors use a 370
volt, 15 mfd capacitor.
Blower Wheel
All furnaces use forward curved
blower wheels that directly mount to
the motor shaft. There are four
wheel sizes: the 45,000 BTUH,
60,000 BTUH, and 75,000 BTUH
standard cabinet models use a
11" x 7" (diameter x width) wheel.
The 120,000 BTUH unit uses a
11" x 10" wheel. The 90,000 BTUH
and 105,000 BTUH units use a
12" x 11" wheel. 75,000 BTUH wide
cabinet models use the 12" x 7"
blower wheel. See the physical data
and specifications tables for details.
CABINET
Cabinet Body
(·)GRA/(-)GTA units come in a
cabinet of prepainted galvanized
steel. There are access openings on
both sides (upflow units) or in the top
(downflow units) for electrical power.
Gas piping, and condensate drain
openings are on both sides. Com-
bustion air piping enters on the top
and right side of upflow units, or top
only on downflow units. The exhaust
piping opening is in the top plate.
Return air can enter through the
sides, bottom or back of upflow units.
(-)GRA units come with a factory
installed base pan which must be
removed when using bottom air
return. This cabinet body is of an
identical design as previous Low
Profile furnaces to mate with all
standard accessories.
The burner compartment is air tight
and acts as a combustion air entry
chamber. All unused openings come
with seals. The gas pipe and
combustion air openings have
gaskets to assure an airtight seal.
Doors
Both the burner compartment door
and the blower compartment door
attach and lock in place with
thumbscrews for quick removal and
replacement. They are made of
galvanized pre-painted steel. The
burner compartment door has gasket
material on its inside edge for an
airtight seal and has a sightglass to
view burner operations.
ACCESSORIESAND
OPTIONALEQUIPMENT
L.P. CONVERSION KITS
(All models)
To obtain the correct L.P. conversion
kit, first note the complete model
number and serial number of the
furnace being converted. Refer to
Table 7 for the correct conversion kit
number. Kits may be obtained from a
local Distributor or the Factory Parts
Department.
TABLE7
LP KITS
FUELCODE KITNO. LOCATION
DC/ OF EPSOH
u.s,0 7999'
DC/ OF
FP-02
EP88H
U.S.,
sooo·and Above
DC /OF
FP-03
EP81H Canada,O • 4500'
FP-05
EB / EC
I EH / EJ
EBiEC/EH/EJ
FP-02
FP-03
U.S., 0 7999"
U.S., 8000' and Above
EBIEC/EH/EJ
FP-05 Canada,O • 4500'
EK/ EL
EK/ EL
FP-02
FP-03
U
s.,0 • 7999'
U.S , 8000' and Above
EK/ EL FP-05 Canada,O 4500'
t
18
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