Intertek ACVC96 Service Instructions Manual page 27

INSTALLATION CONSIDERATIONS
Inlet gas supply pressures must be maintained within the
ranges specified below. The supply pressure must be con-
stant and available with all other household gas fired appli-
ances operating. The minimum gas supply pressure must
be maintained to prevent unreliable ignition. The maximum
must not be exceeded to prevent unit overfiring.
INLET GAS SUPPLY PRESSURE
Natural Gas Minimum: 4.5" w.c.
Propane Gas Minimum: 11.0" w.c.
HIGH ALTITUDE DERATE
When this furnace is installed at high altitude, the appropri-
ate High Altitude orifice kit must be applied. This is required
due to the natural reduction in the density of both the gas
fuel and combustion air as altitude increases. The kit will
provide the proper design certified input rate within the speci-
fied altitude range.
High altitude kits are purchased according to the installa-
tion altitude and usage of either natural or propane gas.
Refer to the product Specification Sheet or Technical Manual
for a tabular listing of appropriate altitude ranges and corre-
sponding manufacturer's high altitude (Natural, Propane gas,
and/or Pressure Switch) kits.
Do not derate the furnace by adjusting the manifold pres-
sure to a lower pressure than specified on the furnace rat-
ing plate. The combination of the lower air density and a
lower manifold pressure will prohibit the burner orifice from
drawing the proper amount of air into the burner. This may
cause incomplete combustion, flashback, and possible yel-
low tipping.
In some areas the gas supplier may artificially derate the
gas in an effort to compensate for the effects of altitude. If
the gas is artificially derated, the appropriate orifice size
must be determined based upon the BTU/ft
derated gas and the altitude. Refer to the National Fuel Gas
Code, NFPA 54/ANSI Z223.1, and information provided by
the gas supplier to determine the proper orifice size.
A different pressure switch may be required at high altitude
regardless of the BTU/ft 3
the product Specification Sheet or Technical Manual for a
tabular listing of appropriate altitude ranges and correspond-
ing manufacturer's pressure switch kits.
PROPANE GAS CONVERSION
P
OSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR IF
THE CORRECT CONVERSION KITS ARE NOT INSTALLED.
MUST BE APPLIED TO INSURE SAFE AND PROPER FURNACE OPERATION.
CONVERSIONS MUST BE PERFORMED BY A QUALIFIED INSTALLER OR SERVICE
AGENCY.
Maximum: 10.0" w.c.
Maximum: 13.0" w.c.
3 content of the
content of the fuel used. Refer to
WARNING
T
HE APPROPRIATE KITS
DESCRIPTION: This kit is designed for gas-fired units con-
verted to propane gas use. The Propane Low Pressure
(LPLP03) Kit monitors the gas line pressure with a pressure
switch and disables the unit's gas valve if the line pressure
drops below acceptable levels.
GAS VALVE
This unit is equipped with a 24 volt gas valve controlled dur-
ing furnace operation by the integrated control module. As
shipped, the valve is configured for natural gas. The valve is
field convertible for use with propane gas by using the ap-
propriate propane gas conversion kit. Taps for measuring
the gas supply pressure and manifold pressure are provided
on the valve.
White-Rodgers 2-Stage Valve
NOTE: The gas supply pressure on White-Rodger "J"
model gas valve, used on single and two stage fur-
naces, can be checked with a gas pressure test kit (Part
#0151K00000S) available through our authorized dis-
tributors.
A
LL
MANIFOLD
Low (Main)
Common
High
27