Heat Controller DMH18DB-1 manual FunctionofOutdoor Unit, Operation, Service Manual, Operating Step

Operation

FunctionofOutdoor Unit

Outdoor Unit

Operating Step

•Compressor step varies considering condition such as room temp,outdoor temp, operating room number,Temp gap between room temp and set temp and so on.

LEV Control

•LEV pulse is modulated to keep constant superheat or subcooling.

Out door Fan Control

•Outdoor fan operates at High or Off to respond to the load condition.

R/Valve Control(Heating Model Only)

•Convert R/Valve to change cooling to heating, heating to cooling.

Defrost Function

•After 45 min heating operation, check the defrost condition and if outdoor pipe temp is below -

5°C(23°F) and released from deice operation in case outdoor pipe temp is over 12°C(53.6°F) or 9 min cooing mode.

•To deice outdoor heat exchanger in low temp condtion, convert operating mode from heating to cooling mode.

Oil Return System

•In single(one) comp operation duration, another comp will operate for 30 seconds every 1 hours.

Comp Overload Protection

•To protect comp from being overload, protector will turn off the comp.

High Pressure Protction

•If cycle pressure is too high(around 36.7 kgf/cm2), it will turn off comp A

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