Carrier 58MVP - Manual (Page 36)

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