Carrier 38VMA Series Service Manual page 34

Table 29 - In Cooling Operation
Compressor
Outdoor unit fan (FAN A)
Outdoor unit fan (FAN B)
Four way valve (ST1)
Electronic expansion valve (EXV A)
Electronic expansion valve (EXV B)
Electronic expansion valve (EXV C)
Solenoid valve (SV4)
Solenoid valve (SV7)
Table 30 - In Heating Operation
Ending conditions
Compressor
Outdoor unit fan (FAN A)
Outdoor unit fan (FAN B)
Four way valve (ST1)
Electronic expansion valve (EXV A)
Electronic expansion valve (EXV B)
Electronic expansion valve (EXV C)
Solenoid valve (SV4)
Solenoid valve (SV7)
Ending conditions
Component
Component
Follower Unit Operation
OFF
OFF
OFF
ON
0 P
0 P
0 P
OFF
OFF
Follower unit is required to operate.
Follower unit operation
OFF
OFF
OFF
ON
0 P
0 P
0 P
OFF
OFF
Follower unit is required to operate.
34