Carrier 58VCA - Manual (Page 6)

A WARNING
' ................- -
If overheating occurs, or the gas valve fails to shut off the
gas supply, turn OFF the manual gas valve to the furnace
BEFORE turning OFF the electrical supply. (See Fig. 9.)
Failure to follow this warning could result in a fire or explo­
sion, and personal injury or death.
• CHECK AIR FILTER: Before attempting to start your fur­
nace, be sure the furnace filter is clean and in place. (See the
maintenance section of this manual.) Then proceed as follows:
STEPS FOR STARTING YOUR FURNACE
1. Set your room thermostat to the lowest temperature set­
ting. (See Fig. 8.)
2. Close the external manual gas valve. (See Fig. 9.)
3. Turn OFF the electrical supply to the furnace. (See
b. Downflow—Remove blower door first, then remove the
control door. (See Fig. 12.)
5. Tbrn the control knob on the gas valve to the OFF position
and wait 5 minutes. Then smell for gas (including near the
floor). If you smell gas,
STOP! Follow operating instruc­
tions on furnace control access door. (See Fig. 13.)
6. After waiting 5 minutes, turn the control knob on the gas
valve to the ON position. (See Fig. 13.)
7. Replace the access doors. (See Fig. 14 for upflow and
Fig. 15 for downflow.) Replace control door first on down­
flow furnaces. Then replace blower door.
8. Tbrn ON the electrical supply to the furnace and wait 1
minute. (See Fig. 16.)
9. Open the external manual gas valve. (See Fig. 17.)
10. Set the room thermostat to a temperature slightly above
room temperature. This will automatically signal the fur­
nace to start.
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11. The speed of the induced draft motor is gradually in­
creased until the flow-proving switches make. Shortly
thereafter the pilot ignition system begins sparking and
the pilot flame lights. After a 40- to 70-sec time delay that
takes place while the system is automatically verifying
that a pilot flame has been established, the gas valve per­
mits gas to flow to the main burners, and the pilot lights
the burners. After another built-in time-delay of approxi­
mately 35 sec, your furnace blower starts at low speed for
20 sec before the microprocessor control makes the neces­
sary adjustments to operate the blower at either the low- or
high-fire speed.