Icom IC-M71 - Page 132

TM 10-7360-226-13&P
CONTAINERIZED KITCHEN (CK) 0018 00
UNIT MAINTENANCE PROCEDURES
0018 00-3
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 Indicator Status (Green) Indicator Status (Red)
A/C Off Damper Open
Low Cool (first 2 minutes) Damper Open
Low Cool
A/C 1, Compressor 1
A/C 1, Evaporator Blower Low
A/C 1, Condenser Blower Low
Low Cool (second 2 minutes) Damper Open
Low Cool
A/C 1, Compressor 1
A/C 1, Compressor 2
A/C 1, Evaporator Blower Low
A/C 1, Condenser Blower Low
High Cool (first 2 minutes) Damper Open
High Cool
A/C 1, Compressor 1
A/C 1, Evaporator Blower High
A/C 1, Condenser Blower High
High Cool (second 2 minutes) Damper Open
High Cool
A/C 1, Compressor 1
A/C 1, Compressor 2
A/C 1, Evaporator Blower Low
A/C 1, Condenser Blower Low
High Cool (third 2 minutes) Damper Open
High Cool
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
High Cool (fourth 2 minutes) Damper Open
High Cool
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
Heat Heat A/C 1, Evaporator Blower High
A/C 1, Heater Relay
Figure 2. Air Conditioner Sequential Status.
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.