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.

 

 

Heat Sink temp

 

 

 

Toff=85°C(185°F)

 

 

 

 

 

 

T2=75°C(167°F)

 

 

 

 

 

 

T1=70°C(158°F)

 

 

 

 

 

 

COMP

Set

5 Hz

Set

5 Hz

OFF

Set

Hz

frequency

Down

frequency

Down

frequency

 

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Only for training and service purposes

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Heat Controller VMC30SB-1/VMH30SB-1 service manual Function, Heat sink sensor failure error, Heat sink temperature control

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