FIGURE 5
7
2ND STAGE
COOLING
RELAY
FAN
R
Y2
C
G
HEATING
1ST STAGE
TRANSFORMER
24VAC
1
2
3
4
5
6
7
8
W1
Y1
COOLING
1ST STAGE
24VAC "HOT"
24VAC "COMMON"
TWO STAGE HVAC SYSTEM
RC-120
W1
Y1
C
Y2
G
R
24VAC "HOT"
FAN
24VAC "COMMON"
1ST STAGE
NOT USED
COOLING
COOLING
2ND STAGE
HEATING
1ST STAGE
W2
2ND STAGE
HEATING
W2
HEATING
2ND STAGE