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WARNING:
This furnace was equipped at the fac-
tory for use with natural gas only. A
special kit, supplied by the manufac-
turer, is required to convert the fur-
nace to operate on LP/propane gas.
Failure to use the proper conversion
kit can cause fire, explosion, property
damage, carbon monoxide poisoning,
personal injury, or death.
MANIFOLD PRESSURE
ADJUSTMENT
Manifold pressures for low and high stages are
independently adjustable. Adjustment tap
locations on the valve are shown in Figure 20.
Manifold pressure would be adjusted below
procedure:
- Turn off gas shut off valve outside furnace.
- Install manometer on the gas valve at the
outlet pressure tap.
- Turn on the shut off. Run furnace at high
fire and set manifold pressure. Also set
manifold pressure while running at low fire
(refer to Tables 6 and 7.)
- Ensure plug is tight after removing
manometer.
Conversion
Conversion of this furnace to use LP/propane
gas must be made by qualified service
personnel, using only approved parts.
IMPORTANT NOTE: When converting a low
NOx furnace from Natural Gas to LP/Propane
Gas, it is necessary to remove the NOx
baffles from the furnace.
HIGH ALTITUDE CONVERSION
High Altitude Application
Conversion of this furnace to replace the pressure
switch or to utilize LP/propane gas must be made
by qualified service personnel, using factory
authorized or approved parts. High altitude
applications with this furnace can be field
performed by a simple adjustment of manifold
pressure, and if necessary changing the orifices
and the vent pressure switch. The changes
required depend on the installation altitude and
the heating value of the gas. The gas heating
24
HIGH STAGE ADJUSTMENT
UNDER VENT CAP
2-STAGE
OPERATOR
INLET PRESSURE TAP
1/8 NPT
(Honeywell shown)
(4) QUICK DISCONNECT TERMINALS
1ST STAGE
REGULATOR COVER
REGULATOR ADJUST
BENEATH THIS SCREW
VENT (.330 DIA.
+DFT. POST)
ACCEPTS 5/16" HOSE
CONNECTION
2ND STAGE
REGULATOR COVER
REGULATOR ADJUST
BENEATH THIS SCREW
(White Rodgers shown)
Figure 20. Gas Valve
value based on sea level can be obtained from
your local gas utility. The heating value of gas
at high altitude is always lower than the sea level
heating value. The heating values used in Tables
10 and 11 are based on sea level values.
Pressure Switch Conversion for
High Altitude Applications
These units are factory equipped to operate
between zero and 8000 feet above sea level. For
higher altitude applications, you may need to
replace the vent pressure switch in addition to the
main gas burner orifices.
Natural Gas High Altitude
Conversion
All factory shipped furnaces are ready to operate
between zero and 4999 ft. above sea level. For
higher altitudes (between 5000 and 10,000 ft.
above sea level), conversion can be achieved
simply by adjusting the furnace manifold
pressure as shown in Tables 6 and 7.
VENT FITTING FOR 90 PLUS
EFFICIENT APPLIANCES
LOW STAGE ADJUSTMENT
UNDER VENT CAP
OUTLET PRESSURE TAP
1/8 NPT
INLET PRESSURE POST
SET SCREW: 3/32" HEX HEAD
(.339 DIA. +DFT.)
ACCEPTS 5/18"
HOSE CONNECTION
CONTROL
LABEL
OUTLET PRESSURE
POST SET SCREW: 3/32"
HEX HEAD (.339 DIA. +DFT.)
ACCEPTS 5/18" HOSE CONNECTION
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