Icom IC-M71 Instruction Manual page 132

CONTAINERIZED KITCHEN (CK)
UNIT MAINTENANCE PROCEDURES
Remove the access panels of both air conditioners. Set the ECU Mode Switch in the operating
area for High Cool. Monitor ECU operation by noting the LEDs as shown in Figure 1. LED
configuration is also shown on the inside cover of the control box. As the air conditioners are
automatically cycled through their operation (See Figure 2 for reference) note the sequence of
events. As the LED turns on during the cycle, check the voltage at the air conditioner terminal
board. A voltage of 12 VDC should be noted as each LED lamp comes on. See Figure 3.
Operation
A/C Off
Low Cool (first 2 minutes)
Low Cool (second 2 minutes)
High Cool (first 2 minutes)
High Cool (second 2 minutes)
High Cool (third 2 minutes)
High Cool (fourth 2 minutes)
Heat
If the diagnostic sequence is correct and the output voltages (12 VDC) are correct at each
terminal board connection on the air conditioner, the ECU controller board is functioning
properly, and the fault is in the air conditioner. Replace the air conditioner using the procedure
in the next section.
TM 10-7360-226-13&P
Indicator Status (Green)
Damper Open
Damper Open
Low Cool
Damper Open
Low Cool
Damper Open
High Cool
Damper Open
High Cool
Damper Open
High Cool
Damper Open
High Cool
Heat
Figure 2. Air Conditioner Sequential Status.
0018 00-3
Indicator Status (Red)
A/C 1, Compressor 1
A/C 1, Evaporator Blower Low
A/C 1, Condenser Blower Low
A/C 1, Compressor 1
A/C 1, Compressor 2
A/C 1, Evaporator Blower Low
A/C 1, Condenser Blower Low
A/C 1, Compressor 1
A/C 1, Evaporator Blower High
A/C 1, Condenser Blower High
A/C 1, Compressor 1
A/C 1, Compressor 2
A/C 1, Evaporator Blower Low
A/C 1, Condenser Blower Low
A/C 1, Compressor 1
A/C 1, Compressor 2
A/C 1, Evaporator Blower Low
A/C 1, Condenser Blower Low
A/C 2, Compressor 1
A/C 2, Evaporator Blower High
A/C 2, Condenser Blower High
A/C 1, Compressor 1
A/C 1, Compressor 2
A/C 1, Evaporator Blower Low
A/C 1, Condenser Blower Low
A/C 2, Compressor 1
A/C 2, Compressor 2
A/C 2, Evaporator Blower Low
A/C 2, Condenser Blower Low
A/C 1, Evaporator Blower High
A/C 1, Heater Relay
0018 00