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Appendix B
Isolation Circuits
THERMOSTAT
FURNACE
CONTROL
BOARD
K
1
K
1
K
2
K
2
OUTDOOR
UNIT
K
1
K
2
FIELD-SUPPLIED
24-VAC SPST RELAYS
R
W
Y
G
C
R
Y
/
Y2
W
/
W1
G
Com
Y
C
A95097
Fig. 5—Isolation of W/W1 and Y/Y2
Thermostat Circuits
THERMOSTAT
FURNACE
CONTROL
BOARD
K
1
K
1
K
1
–FIELD-SUPPLIED
  24-VAC SPST RELAY
R
W
Y
G
C
R
Y
/
Y2
W
/
W1
G
Com
C
Y
FIELD-SUPPLIED
24-VAC (40VA)
TRANSFORMER
120VAC
OUTDOOR
UNIT
A95098
Fig. 6—Isolation of Outdoor Unit with a Separate
24-v Supply
UNIT SIZE (BTUH)
HIGH-PRESSURE SWITCH
LOW-PRESSURE SWITCH
Make Point
Break Point
Make Point
Break Point
40,000
1.81 in. wc max
1.63 in. wc
±
0.05
0.75 in. wc max
0.60 in. wc
±
0.05
60,000
80,000
100,000
120,000
1.81 in. wc max
1.63 in. wc
±
0.05
0.95 in. wc max
0.80 in. wc
±
0.05
A95050
0-4 IN.
SLOPE GAGE
Appendix C
Pressure Check Diagram
36