Natural Gas to Propane Conversion Instructions

16 AG--KC019SNP--02
Specifications subject to change wi thout notice.
8. When correct input is obtained, main burner flame should
be clear blue, almost transparent. (See Figure 22)
9. Jumper R and W/W1 and W2 on control c enter thermostat
connections. This keeps furnace locked in high heat
operation.
10. Adjust high heat input rate manifold pressure for propane
gas.
11. Turn high heat adjusting screw counterclockwise (out) to
decrease input rate or clockwise (in) to increase input
rate.
12. Replace caps that conceal gas valve regulator adjustment
screws.
13. When correct input is obtained, main burner flame should
be clear blue, almost transparent. (See Figure 22)
14. Remove jumper across R, W1, and W2 after high heat
adjustment to terminate call for heat.
15. Turn setup switch SW1 (TT) on furnace control to OFF
position.
16. Turn furnace gas--valve switch to OFF position.
17. Turn off furnace power supply.
18. Remove manometer from the manifold pressure tap of the
gas valve.
19. On some models, apply pipe dope sparingly to end of
1/8--in. (3 mm) pipe plug and install in the manifold
pressure tap opening. Or, on some models, tighten set
screw on manifold tower pressure tap with a 3/32--in. hex
wrench. (See Figure 11)
20. Turn on furnace power supply.
21. Set room thermostat to call for heat.
22. Check pressure tap plug for gas leaks when main burners
ignite.
23. Check for correct burner flame.
24. After making the required manifold pressure adjustments,
check and adjust the furnace temperature rise per the
furnace installation instructions.
Variable Speed, Two--Stage Gas Valve
1. Verify SW1-2 on furnace control is turned “ON”.
2. Jumper R and W/W1 thermostat connections to call for
heat.
3. Check manifold orifices for gas leaks when main burners
ignite.
4. Adjust gas manifold pressure. Refer to Conversion Kit
Rating Plate 344675--201
5. Remove caps that conceal adjustment screws for gas
valve regulators. See Figure 11.
6. Adjust low--heat manifold pressure for propane gas. See
Figure 11.
7. Turn low--heat adjusting screw counterclockwise (out) to
decrease input rate or clockwise (in) to increase input
rate.
NOTE:When correct input is obtained, main burner flame should
be clear blue, almost transparent (see Figure 22).
8. Jumper R, W/W1 and W2 on control center thermostat
connections. This keeps furnace locked in high--heat
operation.
9. Adjust high--heat manifold pressure for propane gas.
10. Turn high--heat adjusting screw counterclockwise (out) to
decrease input rate or clockwise (in) to increase input
rate.
11. Replace caps that conceal gas valve regulator adjustment
screws.
NOTE:When correct input is obtained, main burner flame should
be clear blue, almost transparent (see Figure 22).
12. Remove jumper across R, W1, and W2 after high--heat
adjustment to terminate call for heat.
13. Turn setup switch SW1-2 on furnace control to OFF
position.
14. Turn furnace gas valve switch to OFF position.
15. Turn off furnace power supply.
16. Remove manometer from the manifold pressure tap of the
gas valve.
17. On some models, apply pipe dope sparingly to end of
1/8--in. (3 mm) pipe plug and install in the manifold
pressure tap opening. Or, on some models, tighten set
screw on manifold tower pressure tap with a 3/32--in. hex
wrench. See Figure 11.
18. Turn furnace gas valve switch to ON position.
19. Turn on furnace power supply.
20. Set room thermostat to call for heat.
21. Check pressure tap plug for gas leaks when main burners
ignite.
22. Check for correct burner flame.
23. Observe unit operation through two complete heating
cycles.
24. See Sequence of Operation in furnace Installation,
Start--up, and Operating Instructions.
25. Set room thermostat to desired temperature.
26. After making the required manifold pressure adjustments,
check and adjust the furnace temperature rise per the
furnace installation instructions.
Modulating Gas Valve
! CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in gas valve damage.
Do not force the rotary adjustment switch on the modulating
gas valve. Do not turn the rotary adjustment switch faster than
one click per second when adjusting manifold pressure. Gas
valve will be damaged if excessive force is used on the rotary
switch.
For proper operation and long term reliability, the manifold
pressure must be adjusted as specified on the conversion kit
rating plate.
The modulating furnace manifold pressure is set at two points.
The first point is Maximum Heat. The second point is Minimum
Heat. Do not adjust Intermediate Heat manifold pressure.
Intermediate Heat manifold pressure can be checked as part of
the temperature rise, but is not adjustable. Always adjust
Maximum Heat first, then Minimum Heat.
NOTE:DO NOT set Maximum Heat manifold pressure less than
10.5-in. w.c. or more than 11-in. w.c. for propane gas.
NOTE:Use care when performing adjustments. Gas valve
adjustment is performed by turning a rotary adjustment switch
inside the gas valve with a small straight blade screwdriver.
Excessive force can break or bend the rotary adjustment switch
making it non--adjustable.
To adjust manifold pressure to obtain input rate for
Maximum Heat:
1. Turn Setup switch SW1-2 to ON.
2. Verify Set-up switch SW4-2 is turned OFF.
3. Jumper the R to W/W1 and W2 thermostat connections at
the furnace control board.
4. After the main burners ignite and the blower starts,
confirm Maximum Heat manifold pressure is correct,
based on the manifold pressure table on the Conversion
Kit Rating Plate.
5. To adjust the Maximum Heat manifold pressure, Slowly
turn the rotary adjustment switch counterclockwise to
decrease manifold pressure or clockwise to increase
manifold pressure.