Service manual

ESIE03–01 General Functionality
Part 2 – Functional Description 2–11
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1.6 Thermostat Control
Applicable units All units
Purpose The purpose of thermostat control is to control the compressor operation, by sensing the suction air.
Preventing
thermostat OFF
conditions
The thermostat control prevents the thermostat from turning OFF in the following conditions:
P Initial operation for the first 2.5 min, or
P Defrosting, or
P Forced operating mode.
∆Tr The table below shows how to calculate ∆Tr.
Time chart The time chart below illustrates the thermostat control.
Thermostat The table below describes when the thermostat turns ON and OFF.
In... ∆Tr = Remark
Cooling Tr - Ts P Tr = indoor unit suction air temp.
P Ts = temp. set by the remote controller
Heating Ts - Tr
Thermostat
ON
OFF
¢Tr
0K
1K
When... Then the thermostat turns...
P ¢Tr ≥ 1K
P Guard timer of the compressor has counted down (3 min)
ON
P ¢Tr ≤ 0K
P Thermostat is ON for min. 2 min
OFF