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18
2-1/2-in.
(64.4)
1-1/4-in.
(31.8)
Fig. 23 -- Igniter Position -- Back View
A11405
2 − in.
(2.5 mm
3/8 − in.
3/16− in.
, +0.8 -1.5)
(50 mm)
(9.6 mm)
(4.6 mm)
3/32 − in., +1/32 -3/64-in.
A12392
Fig. 24 -- Igniter Position -- Side View
CONVERT GAS VALVE
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit damage
The G or J gas valve must be converted and pre--adjusted
before operating on natural gas. The E valves must be
pre--adjusted before operating on natural gas. If left this
way, sooting and corrosion will occur leading to early heat
exchanger failure.
CAUTION
!
FIRE, EXPLOSION, ELECTRICAL SHOCK
HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
Gas supply MUST be shut off before disconnecting
electrical power and proceeding with conversion.
!
WARNING
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position and
install a lockout tag. There may be more than one
disconnect switch. Lock out and tag switch with a suitable
warning label. Verify proper operation after servicing.
!
WARNING
1. Refer to Fig. 25.
2. Be sure gas and electrical supplies to furnace are off.
3. Remove caps that conceal adjustment screws for high--heat
and low--heat stage gas valve regulators. (See Fig. 25.)
4. Remove the high--heat and low--heat regulator adjustment
screws.
5. Remove the high--heat and low--heat Propane gas regulat-
or springs (white).
6. Install the high--heat and low--heat natural gas regulator
springs (silver).
7. Install the high--heat and low--heat regulator adjustment
screws.
8. Turn high--heat stage adjusting screw clockwise (in) 12
full turns. This will increase the manifold pressure closer
to the natural high--heat set point. (See Fig. 25.)
9. Turn low--heat stage adjusting screw clockwise (in) 9.5
full turns. This will increase the manifold pressure closer
to the Propane low--heat set point. (See Fig. 25.)
10. DO NOT install regulator seal caps at this time.
A05196
Fig. 25 -- 2 Stage Gas valve
REMOVE LOW GAS PRESSURE SWITCH
NOTE
: There are 2 ways that the Low Gas Pressure Switch
(LGPS) could have been installed during the original Natural to
Propane gas conversion.