Carrier WEATHERMAKER INFINITY 58MCA - Manual (Page 5)

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8
9 10
3. Turn OFF electrical supply to the furnace. (See Fig. 10.)
4. Remove main furnace door. (See Fig. 11.)
11
5. The gas valve will have EITHER a control knob or con-
trol switch to turn off and on. Turn the control knob or
switch on the gas valve to the OFF position and wait
5 minutes. (See Fig. 12.)
12
6. After waiting 5 minutes, turn the control knob or switch
on the gas valve to the ON position. (See Fig. 13.)
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14
15 16
7. Replace main furnace door. (See Fig. 14.)
8. Turn ON the electrical supply to the furnace and wait 1
minute. (See Fig. 15.)
9. Open the external manual gas valve. (See Fig. 16.)
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 combustion air is built up to sufficient
levels, the hot surface ignitor is energized. After the hot
surface ignitor is heated for 17 seconds, the gas valve per-
mits gas to flow to the main burners. After ignition and a
time delay of about 60 sec, the furnace blower will start.
Variable-capacity furnaces start at low speed until the
control makes the necessary adjustments to operate the
blower at either the low- or high-heat speed.
NOTE: If the burners fail to ignite after 4 attempts, the fur-
nace control system will lock out. If lockout occurs, main
burners fail to light, or blower does not come on, shut down
the furnace and call your dealer for service.
12. Set your thermostat to the temperature that satisfies
your comfort requirements. SUGGESTION: Setting
®
CL
O S E
O
F
F
2
3
1 M
P
ON
O
F
F
C
ON
OFF
OR
O
F
F
2
3
1 M
P
ON
O
F
F
C
ON
OFF
OR
OP
E
N