Primary Fan (Electric), Secondary Fan (Fuel)
Stage
1st Stage
2nd Stage
3rd Stage (Before Aux Stage
Delay)
Auxiliary Stage (After Aux
Stage Delay)
E-Heat (Stage 1)
Primary Fan (Fuel), Secondary Fan (Electric)
Stage
1st Stage
2nd Stage
3rd Stage (Before Aux Stage
Delay)
3rd Stage (After Aux Cutoff
Delay)
E-Heat (Stage 1)
Y1
Y2
W1
*
*
*
*
*
*
*
Y1
Y2
W1
*
*
*
*
*
*
*
W2
O
B
*
*
*
*
W2
O
B
*
G
*
*
*
*
G
*
*
*
*
*
*
*
19