Natural Gas to Propane Conversion Instructions

12 AG- KN018SNP- 01
Specifications subject to change without notice.
CHECK INLET GAS PRESSURE
! CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit damage.
DO NOT operate furnace more than one minute to check inlet
gas pressure, as conversion is not complete at this time.
NOTE: This kit is to be used only when inlet gas pressure is
between 12.0-in. w.c. and 13.6-in. w.c.
1. Verify manometer is connected to inlet pressure tap on
gas valve.
2. Turn on furnace power supply.
3. Turn gas supply manual shutoff valve to ON position.
4. Turn furnace gas valve switch to ON position.
5. Turn Setup Switch SW1- 2 on furnace control ON (see
Figure 14).
6. For single- stage jumper R- W thermostat connections on
control.
For two- stage jumper R- W/W1 and R- W2 thermostat
connections on control.
7. When main burners ignite, confirm inlet gas pressure is
between 12.0-in. w.c. and 13.6-in. w.c.
8. For single- stage remove jumper R- W thermostat
connections on control to terminate call for heat.
For two- stage remove jumper R- W/W1 and R- W2
thermostat connections on control to terminate call for
heat.
9. Turn furnace gas valve switch to OFF position.
10. Turn gas supply manual shutoff valve to OFF position.
11. Turn off furnace power supply.
12. Remove manometer.
13. Apply pipe dope sparingly to the end of inlet gas pipe plug
and install into unused end of 1/8- in. (3 mm) tee. Use a
small back- up wrench on tee when tightening gas inlet
pipe plug. (See Figure 16)
Figure 16
80% Low Gas Pressure Switch
2” Brass Nipple
Low Gas
Pressure Switch
Female x Female x Male Tee
1/8” NPT Pipe Plug
For inlet pressure tap
A11398
CHECK FURNACE AND MAKE
ADJUSTMENTS
! WARNING
FIRE AND EXPLOSION HAZARD
Failure to follow this warning could result in personal injury
and/or death.
NEVER test for gas leaks with an open flame. Use a
commercially available soap solution made specifically for the
detection of leaks to check all connections. A fire or explosion
may result causing property damage, personal injury or loss of
life.
! AVERTISSEMENT
RISQUE D’EXPLOSION ET D’INCENDIE
Le fait de ne pas suivre cet avertissement pourrait entraîner
des dommages corporels et / ou la mort.
Ne jamais examiner pour les fuites de gaz avec une flamme
vive. Utilisez plutôt un savon fait specifiquement pour la
détection des fuites de gaz pour verifier tous les connections.
Un incendie ou une explosion peut entrainer des dommages
matériels, des blessures ou la mort.
! WARNING
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.
1. Be sure main gas and electric supplies to furnace are off.
2. Remove 1/8- in. (3 mm) pipe plug from manifold pressure
tap on downstream side of gas valve.
3. Attach manometer to manifold pressure tap on gas valve.
4. Turn gas supply manual shutoff valve to ON position.
5. Turn furnace gas valve switch to ON position.
6. Check all threaded pipe connections for gas leaks.
7. Turn on furnace power supply.
GAS INPUT RATE INFORMATION
The gas input rate for propane is the same as for natural gas.
See furnace rating plate for input rate. The input rate for propane
is determined by manifold pressure and orifice size.
The gas valve must be set for Low Heat first and then set for
High Heat on two-stage and variable-speed furnaces. Furnace
gas input rate on rating plate is for installations at altitudes up to
2000 ft. (610 M).
In the U.S.A., the input rating for altitudes above 2000 ft. (610
M) must be reduced by 4 percent for each 1000 ft. (305 M)
above sea level.