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8. Gas Supply and Piping
!
CARBON MONOXIDE POISONING, FIRE AND
EXPLOSION HAZARD.
Failure to follow this warning could result in
personal injury, death, and/or property damage.
Models designated for Natural Gas are to be used
with Natural Gas ONLY, unless properly converted to
use with Propane gas.
Gas Supply Requirements
Use only the Type of gas approved for this furnace. See rating
•
plate for approved gas type.
Gas input must not exceed the rated input shown on the rating
•
plate. Overfiring will result in failure of heat exchanger and
cause dangerous operation.
Do NOT allow minimum supply pressure to vary downward.
•
Doing so will decrease input to furnace. Refer to Table 3 for
gas supply. Refer to Table 7 or Table 8 for manifold pressures.
Table 3
Gas Pressures
Gas Type
Recommended
Natural
7"
Propane
11"
Natural to Propane Gas Conversion
Note: An accessory kit shall be used to convert to propane gas use,
see the furnace rating plate for the Propane conversion accessory
kit part number.
1.
After disconnecting power and gas supply to the furnace,
remove the access door, exposing gas valve and burner
compartment.
2.
Disconnect gas line from gas valve so manifold assembly
can be removed.
3.
Disconnect wiring at gas valve. Be sure to note the proper
location of any and all electrical wiring disconnected.
4.
Remove the four (4) screws holding the manifold and gas
valve to the manifold supports. Do Not discard any screws.
5.
Carefully remove the manifold assembly.
6.
Remove the Natural gas (brass) burner orifices from the
manifold assembly and replace them with the appropriate
Propane (silver) orifices furnished in the conversion kit
unless converting high altitude unit, then see Table 6 or
Table 8 for appropriate orifices. (Figure 10)
Remove Orifices
Figure 10
441 01 5003 01
Supply Pressure in wc
Max.
Min.
14"
4.5"
14"
25--21--00
Specifications are subject to change without notice
T
7.
ighten the orifices so they are seated and gas tight about 1
1
/
" from the face of the orifice to the back of the manifold
8
pipe (Figure 11). Make sure orifice is installed straight so that
it forms a right angle (90°) to the manifold.
Figure 11
1.11" (28.2mm)
1.21" (30.8mm)
8.
Remove the cap screw and pressure regulator adjusting
screw from valve. (see Figure 12)
9.
Remove the existing regulator spring from the regulator
housing.
10. Insert the replacement spring (red color) contained in this kit
into regulator housing.
11"
11. Install the pressure regulator adjusting screw and give it
eleven (11) full clockwise turns. This will set the manifold
pressure close to required setting for normal operation.
12. Replace the regulator cap screw.
13. Attach the Yellow Attention Label contained in the kit to the
Gas Valve where it can be readily seen.
Figure 12
Note: A low gas pressure switch is required for conversion.
Changing Orifices
Measure from face of orifice to
the back side of the manifold.
Typical Regulator Assembly
Color Code For
Propane
Gas
Pressure
Regulator
Black
Adjusting Screw
Spring
Red
Natural Gas
Black
Stainless
Steel
15
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