Icom IC-M71 - Page 131

TM 10-7360-226-13&P
CONTAINERIZED KITCHEN (CK) 0018 00
UNIT MAINTENANCE PROCEDURES
0018 00-2
If the 24 VDC at the MBU Converter is correct, check the 24 VDC wiring to the kitchen area.
Electrical Power: See Power Entrance Panel: WP 0026 00
Cook Center Fan Assemblies: Rotate the fan control knob on the kitchen wall to the full
clockwise position. To check the intake fan, remove the filter located on the air conditioning
side of the Mechanical Room. Remove the cover from the fan and check the voltage. It should
measure approximately 220 VAC. As the fan control is rotated counterclockwise position the
voltage will decrease. If voltage is not present, check the circuit breaker and the voltage at the
circuit breaker panel. If 220 VAC is present, the fan assembly needs to be replaced. Refer to
the replacement procedure in the next section for access to the fan.
To check the exhaust fan, remove and retain the four mounting bolts on the exhaust duct and
remove the fan assembly. Follow the procedure above to check fan operation.
Environmental Control Unit (ECU): The ECU is controlled from the wall switch in the food
preparation area. If the ECU is not cooling or warming properly, check that the ECU Mode
Switch in the food preparation area is set to the proper position. At the ECU Control Box
located on the Mechanical Room wall behind the generator, next to the air conditioners, check
the power supply output voltage at P5 (5 VDC) and P6 (12 VDC) as shown in Figure 1. If the
voltage is not correct, replace the power supply. If the voltage is correct, perform the following
diagnostic check to isolate the problem to an individual ECU and verify operation of the ECU
control card.
UNIT-2 EVAPORATOR BLOWER LOW
UNIT-2 EVAPORATOR BLOWER HIGH
UNIT-2 CONDENSER BLOWER LOW
UNIT-2 CONDENSER BLOWER HIGH
UNIT-1 EVAPORATOR BLOWER LOW
UNIT-1 EVAPORATOR BLOWER HIGH
UNIT-1 CONDENSER BLOWER LOW
UNIT-1 CONDENSER BLOWER HIGH
UNIT-1 COMPRESSOR-1
UNIT-1 COMPRESSOR-2
UNUSED
UNIT-2 COMPRESSOR-2
HEATER RELAY
UNIT-2 COMPRESSOR-1
RED LEDS
LOW COOL
HIGH COOL
UNUSED
UNUSED
GREEN LEDS
DAMPER OPEN
UNIT-1 NO FREEZE
UNIT-2 NO FREEZE
HEAT
P1
P4
P2
P3
2 1 2 1
(12 VDC) P6 P5 ( 5 VDC)
Figure 1. ECU Controller Board.