1--19
©
2012 Mobile Climate Control
T-348 Rev. 07/2012
1.16 RELAY BOARD, 24VDC
Figure 1-12. Relay Board
a. Relays
K1 Energizes evaporator fans in low speed
K2 Energizes evaporator fans in high speed
(not energized in low speed).
K 7 Energizes condenser fans in low speed
K 8 Energizes condenser in high speed
(not energized in low speed).
K13 Energizes the A/C clutch and liquid line
solenoid valve.
K14 Energizes unloader 1.
K15 Energizes unloader 2.
K16 Energizes fresh air damper.
K17 Energizes reheat coolant valve.
K18 Energizes the fault light output.
K19 Energizes the boost pump.
K20 Energizes the driver’s liquid line solenoid
valve.
b. Connectors
JA Relay board connector(communication
to system).
JB Boost pump.
JC Ribbon Cable (Logic Module to Relay
Board)
c. Fuses
F1
Fresh air relay.
F2
Unloader 1 relay.
F3
Evaporator fan motor relay.
F4
Fault light out relay.
F5
Unloader 2 relay.
F6
Heater relay.
F7
Clutch relay.
F8
Spare.
F9
Condenser motor fan relay.
F10 Boost pump relay.
d. LEDS
D 2 Evaporator fans output active -- high
speed
D 6 Evaporator fans output active.
D26 Condenser fans output active.
D30 Condenser fans on high speed
D51 A/C clutch and liquid line solenoid valve
output active.
D54 Unloader 1 output active.
D57 Unloader 2 output active.
D63 Heat output active (RCV).
D66 Fault output active.
D69 Boost pump output active.
D72 Driver’s liquid line solenoid valve active.
D17 Fresh air relay fuse out.
D38 Unloader 1 relay fuse out.
D18 Evaporator fan motor relay fuse out.
D68 Fault light out relay fuse out.
D47 Unloader 2 relay fuse out.
D61 Heater relay fuse out.
D90 Clutch relay fuse out.
D77 Unloader 1 fuse out.
D31 Condenser motor fan relay fuse out.
D83 Boost pump relay fuse out.
