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Only for training and service purposes
Part 2 Functions & Controls
5.8.2 18,24,30kBtu/h Model
• Function
: Power module failure is protected by checking the temperature of heat sink via a temperature sensor.
• Heat sink sensor failure error
Short Check : if temperature ≥130°C(266
°F)
Open Check : if temperature < - 30°C(-22
°F)
System will go in self diagnosis (Error code 65) is displayed and product stops.
• Heat sink temperature control
a) Heat sink temperature < T2 : No limitation on compressor frequency
b) T2 ≤ heat sink temperature < Toff : Compressor frequency down by 5 Hz
c) Heat sink temperature ≥ Toff : Compressor will be off.
The system will stop if this situation occurs 5 times within 1 hour an which error Code4 will be generated and
self diagnosis will start.
If high temperature situation occurs 5 times in 1 hr system counts 1 error and after that 4 times if this situation
occurs system stops and give error code.
If the temperature reaches Toff condition, the system will count the occurrence 5 times, then the system will
stop with error code 4.
COMP
Hz
Toff=85°C(185°F)
T2=75°C(167°F)
OFF
Set
frequency
Set
frequency
Set
frequency
Heat Sink temp
5 Hz
Down
5 Hz
Down
T1=70°C(158°F)