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6
11 12
3. Turn OFF electrical supply to the furnace. (See Fig. 12.)
4. Remove main furnace door. (See Fig. 13.)
13
5. The gas valve will have a control switch to turn off and on.
Turn the control switch on the gas control to the OFF
position and wait 5 minutes. (See Fig. 14 or 15.) Then
smell for gas, including near the floor. If you smell gas,
STOP! Follow “B” on furnace label. If you don’t smell
gas, go to next step.
For 58MTB and 58MVB
14
For 58MCB and 58MXB
15
For 58MTB and 58MVB
16
For 58MCB and 58MXB
17
6. After waiting 5 minutes, turn the control switch on the gas
control to the ON position. (See Fig. 16 or 17.)
18
19 20
7. Replace main furnace door. (See Fig. 18.)
8. Turn ON the electrical supply to the furnace and wait 1
minute. (See Fig. 19.)
9. Open the external manual gas valve. (See Fig. 20.)
10. Set the room thermostat to a temperature slightly
above the room temperature. This will automatically
signal the furnace to start.
11. When the furnace receives the start signal, the inducer is
started. When the pressure switch senses that there is suf-
ficient combustion air, the hot surface igniter is energized.
C
L
O
S
E
A05099
ON
OFF
OR
A05118
ON
O
F
F
M
P
C
1
3
2
A04151
ON
OFF
OR
2
3
1
M
P
O
N
C
O
F
F
A05100
O
P
E
N