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1018454-D
Page 5
All controls are preassembled at the factory.
The normal manifold pressure should be 3.5” w.c. on Natural
Gas. The maximum inlet pressure in the gas supply pipe
should never exceed 7.0” w.c. on Natural Gas.
The appliance and its individual shutoff valve must be disconnected
from the gas supply piping system during any pressure testing of
that system at test pressures in excess of 1/2 psig.
The appliance must be isolated from the gas supply piping
system by closing its individual manual shutoff valve during
any pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 psig.
The minimum inlet pressure in the gas supply pipe should be
5.0” w.c. on Natural Gas “for purpose of input adjustment”.
The appliance is orificed at the factory for elevations between
sea level and 2,000 feet. If installed above 2,000 feet, the BTU
input must be reduced 4% per 1,000 feet that the furnace is
above sea level. See the following orifice chart for the proper
orifice for a specific elevation. The orifice(s) will have to be
drilled to correct size by a qualified installer, service technician
or the gas supplier.
CONTROLS
Model
0’ -
2,000’ - 4,000’ - 6,000’ - 8,000’ -
No.
2,000’ 4,000’ 6,000’ 8,000’ 10,000’
W255GPPR 43 44 45 47 48
W255GPPD 43 44 45 47 48
W355GPPR 36 38 40 41 43
W355GPPD 36 38 40 41 43
ORDER KIT #49820 45-1 High Altitude Kit
Model
0’ -
2,000’ - 4,000’ - 6,000’ - 8,000’ -
No.
2,000’ 4,000’ 6,000’ 8,000’ 10,000’
W505GPPR 43 44 45 47 48
W505GPPD 43 44 45 47 48
ORDER KIT #49850 2287-2 High Altitude Kit
ORIFICES
CLEARANCES
As viewed from
the front of heater,
these are the minimum
clearances from cabinet
to combustible
construction:
Side Wall - 1”
without Pilot Pro Cover
Side Wall - 10”
with Pilot Pro Cover
Floor - 2”
Ceiling - 11”
• In selecting a location for installation it is necessary to
provide adequate accessibility clearances for servicing
and proper operation.
• This appliance must not be connected to a chimney flue
that serves to vent a solid-fuel burning (wood or coal)
appliance, or a multi-vent system.
At least 11”
At least 2”
At
least 10”
with Pilot
Pro Cover
Top of
heater
housing
CEILING
FLOOR
SIDE W
ALL
bottom
of heater
housing
BE SURE TO LEAVE ENOUGH ROOM
ON ONE SIDE OF THE HEATER FOR THE
COVER AND MOUNTING PLATE PLACEMENT
Removal of the cover requires at least 10" of space
from the heater housing to the side wall.