Thermistors; Fan Status Switch (Fs1, Fs2) - Carrier 38APS025 Manual

WIRING DIAGRAM
THERMISTOR
DESIGNATION
Discharge
DTT Temperature
Thermistor
Outside Air
OAT
Temperature
Return Air
RAT
Temperature
Return Gas
RGTA
Thermistor, Circuit A
Return Gas
RGTB
Thermistor, Circuit B
Supply Air
SAT
Temperature
Space Temperature
T55
Thermistor
Space Temperature
Thermistor
T56
Space Temperature
Offset
a38-7133
LEGEND
FS1 — Fan Status Switch (24-v)
MAT — Mixed Air Temperature Sensor
RAT — Return Air Temperature Sensor
SAT — Supply Air Temperature Sensor
*FS1 or FS2 can be pressure differential switch (shown), motor current detection, or sail
switch.
Fig. 24 — Mixed Air Temperature (MAT)/Return Air Temperature (RAT), Supply Air Temperature (SAT)
Table 9 — Thermistors
FIELD
CONNECTION
Factory
Factory
LVT-19, -20
Factory
Factory
LVT-11, -19
LVT-21, -22
LVT-21, -22
LVT-22, -23
RETURN
AIR
MAT/RAT
OUTSIDE
AIR
EVAPORATOR
COIL
and Fan Status Switch Sensor Layout
CONTROLLER REFERENCE
CONNECTION VOLTAGE
AUX-J6 CH11 5.0 vdc
MBB-J8-7, 8 4.0 vdc
MBB-J8-11, 12 4.0 vdc
MBB-J8-1, 2 4.0 vdc
MBB-J8-3, 4 4.0 vdc
MBB-J8-12, 13 4.0 vdc
MBB-J8-9, -6 4.0 vdc
MBB-J8-9, -6 4.0 vdc
MBB-J8-6, -5 4.0 vdc
FS2
OR
FS1*
FAN
29
COMMENTS
Digital compressor units only
Not used on 38APS065
38APD and 38APS065 only
SAT
DUCT
SUPPLY