Pe n – Carrier 58MVC User Manual

Page 6

A92185

Fig. 9 -- Turn Off Electrical Supply

A05099

Fig. 10 -- Remove Furnace Door

A04150

Fig. 11 -- Control Switch to OFF

A04151

Fig. 12 -- Control Switch to ON

A05100

Fig. 13 -- Furnace Door Replaced

A92359

Fig. 14 -- Turn On Electrical Supply

A06189

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.

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.