Carrier 38MGRBQ18B-3 - WIRING DIAGRAMS; Diagrams by Unit Size

38MGRBQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
7
WIRING DIAGRAMS
Size 18K (18R)
Fig. 8 — Wiring Diagram Size 18K (18R) - 2 Zone
Table 2 — Wiring Diagram Size 18K (18R) - 2 Zone Max Codes
CODE PART NAME
COMP Compressor
EEV Electric Expansion Valve
FM1 DC Fan Motor
HEAT_D Chassis Heater
HEAT_Y Crankcase Heater
H-PRO High Pressure Switch
L-PRO Low Pressure Switch
SV Reversing Valve
TP Comp. Discharge Temperature Sensor
T3 Outdoor Coil Temperature Sensor
T4 Outdoor Ambient Temperature Sensor
COMP TOP Compressor TOP OLP Temperature Sensor
8
&203723
&1
&1
&1
&1
&1 &1 &1
:
9
8
&1
&1
&1
&1
&1
&1
&1
&1
&1
&1
'&)$102725
,1'225&2,/
287/(77(03
6(16257%
;7
;7
SA/SB and N-IN
Input:0-5VDC
Input:0-5VDC
Output:12VDC
Input:0VDC
Connect to FAN
voltage among
phases 0~200VAC
U~V~W among
phases 0~250VAC
Input:0-5VDC
Output:230 VAC
Output:230 VAC
Output:230 VAC
L-IN and N-IN
Output:5VDC
Intput:230 VAC
Input:0-24VAC
Input:5VDC
MAIN CONTROL BOARD
5(9(56,1*9$/9(