GAS FURNACE SEQUENCE OF OPERATION Flashcards
1
Q
1.
A
CHECK FOR POWER
make sure you have 120vac and 24vac
2
Q
2.
A
CHECK FOR GAS
make sure gas stops are on to unit
3
Q
3.
A
INITIATE CALL FOR HEAT set stat to heat
make sure set temp above room temp
4
Q
4.
A
INDUCER MOTOR STARTS (PRE-PURGE)
15-30 sec
5
Q
5.
A
PRESSURE SWITCH CLOSES
6
Q
6.
A
IGNITOR IS POWERED
7
Q
7.
A
GAS VALVE IS POWERED
8
Q
8.
A
FLAME ROD PROVES FLAME
3-7 seconds
9
Q
9.
A
BLOWER MOTOR IS POWERED
30-45sec
10
Q
10.
A
THERMOSTAT REACHES TEMPERATURE
11
Q
11.
A
GAS VALVE OPENS
12
Q
12.
A
INDUCER RUNS (POST-PURGE)
15-30sec
13
Q
13.
A
BLOWER CONTINUES TO RUN COOL DOWN 90-240sec
