33
4. Turn on furnace power supply.
5. Turn gas supply manual shutoff valve to ON position.
6. Turn furnace gas valve switch to ON position.
7. Verify SW1-2 on furnace control is turned “ON”. See Fig.
44.
8. Jumper R and W/W1 thermostat connections to call for
heat.
9. Check manifold orifices for gas leaks when main burners
ignite.
10. Adjust gas manifold pressure. (Refer to Table 7 or 8.)
11. Remove caps that conceal adjustment screws for gas valve
regulators. (See Fig. 41.)
12. Adjust low--heat manifold pressure for natural gas. (See
Fig. 41.)
13. 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 Fig. 45).
14. Jumper R, W/W1 and W2 on control center thermostat
connections. This keeps furnace locked in high--heat oper-
ation.
15. Adjust high--heat manifold pressure for natural gas.
16. Turn high--heat adjusting screw counterclockwise (out) to
decrease input rate or clockwise (in) to increase input rate.
17. Replace caps that conceal the gas valve regulator adjust-
ment screws.
NOTE
: When correct input is obtained, main burner flame
should be clear blue, almost transparent. (See Fig. 45).
Burner Flame
Burner
Manifold
A11461
Fig. 45 -- Burner Flame
18. Remove jumper across R, W1, and W2 after high--heat ad-
justment to terminate call for heat.
19. Turn setup switch SW1-2 on furnace control to OFF posi-
tion.
20. Turn furnace gas valve switch to OFF position.
21. Turn off furnace power supply.
22. Remove manometer and re-install manifold pressure tap
plug.
23. Turn furnace gas valve switch to ON position.
24. Turn on furnace power supply.
25. Set room thermostat to call for heat.
26. Check pressure tap plug for gas leaks when main burners
ignite.
27. Check for correct burner flame.
28. After making the required manifold pressure adjustments,
check and adjust the furnace temperature rise per the fur-
nace installation instructions.
LABEL APPLICATION
1. Fill in Conversion Responsibility Label 340071--205 and
apply to Blower Access Door of furnace as shown. Date,
name, and address of organization making this conversion
are required. See Fig. 46.
2. Attach Conversion Rating Plate Label 340071--204 to out-
er door of furnace. See Fig. 47.
3. Apply Gas Control Conversion Label: For 2--stage J and
G gas valves, use Gas Control Conversion Label
340071--202. (DO NOT use 340071--203, which is simil-
ar.) For 2--stage E gas valve, use Gas Control Adjustment
Label 340071--203. (DO NOT use 340071--202, which is
similar.)
4. Replace control access door, blower access door and outer
door of furnace.
CHECKOUT
1. Observe unit operation through 2 complete heating cycles.
2. See Sequence of Operation in furnace Installation, Start--
Up, and Operating Instructions.
3. Set room thermostat to desired temperature.
A13203
Fig. 46 -- Conversion Responsibility Label