Carrier 58MVC Owner's Manual page 6

Fig. 9 - - Turn Off Electrical Supply
Fig. 10 - - Remove Furnace Door
Fig. 11 - - Control Switch to OFF
Fig. 12 - - Control Switch to ON
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NOTE: If the burners fail to ignite after 4 attempts, the furnace
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.
6
Fig. 13 - - Furnace Door Replaced
Fig. 14 - - Turn On Electrical Supply
Fig. 15 - - Open Valve
7. Replace main furnace door. (See Fig. 13.)
8. Turn ON the electrical supply to the furnace and wait 1
minute. (See Fig. 14.)
9. Open the external manual gas valve. (See Fig. 15.)
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.
After the hot surface igniter is heated for 17 seconds, the gas
valve permits gas to flow to the main burners. After ignition
and a time delay of about 30 sec, the furnace blower will start.
Variable- -capacity furnaces start at medium speed until the
control makes the necessary adjustments to operate the
blower at either the low- -, medium- -, or high- -heat speed.
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