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6.1.9
PC / FC Fans
There are two 12 Volt DC electrically commutated motor (ECM) fans. They provide the required cooling
power to both compartments. The motors are provided with from 18% to 100% voltage by using a pulse
width modulating (PWM) technique. The power/control module controls the switching on and off of the
compressor and the fans. The speed of the FC fan is set and the speed of the PC fan is regulated by
altering the voltage supplied to it.
The FC fan will always runs at a constant speed.
The PC fan speed can be adjusted to meet the requirement of that compartment. Therefore the PC fan
speed will be set at the average speed used from the previous cycles under normal door openings and
loading conditions. During the off cycle of the compressor the PC fan will run at a very low speed to prevent
air transfer in the ducts between the two compartments.
When the compressor is turned on, the fans will also be switched on, except immediately following a defrost
cycle where there is a delay of 30 seconds after the compressor has started before the fans switch on.
FC FAN (Viewed from front)
PC FAN (Viewed from FC side)
Diagram 6.1.9
6.1.10 Light
A 12 volt, 10 watt halogen lamp is used in the PC. To prevent overheating, the lamp is turned off after 5
minutes of the door being left open. The power/control module controls this.
LIGHT FITTING, LAMP AND COVER
Diagram 6.1.10
NOTE: It is important that the lamp pins are tight in the lamp socket.
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