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Outline of control
Outdoor units
Item Operation explanation and applied data, etc. Remarks
9. Compressor This control is to prevent stagnation of refrigerant in the compressor case by a supply of
winding current to heat the windings while the inverter compressor is off. This control is executed
heating control by the inverter outdoor unit only. If the supply of current is not turned on for a specified
time before trial operation, when installation work has finished, a fault of the compressor
may occur. If the power source is interrupted for a period of time it is necessary to switch
power to the system for a minimum of 24 hours before commencing system operation
(1) Control conditions
Compressor stops and TD<35°C.
(2) Contents of control
This control is executed by temperature detected by TK3 sensor as shown in the
following figure.
NOTE:
Switching may be heard during heat winding operation, but it is not an error/fault.
TK3
40 °C
34 °C
25 °C
C zone
B zone
A zone
A zone B zone C zone
Continuous switch-on Intermittent switch-on power: No switch-on power
power ON: 10 minutes
OFF: 5 minutes
10. Crank case This control is executed by the fixed-speed unit only.
heater control (1) Control contents
• This control is switched off when TK3 sensor detected 40°C or higher
temperature, and switched on when TK3 sensor detected 35°C or lower
temperature.
• After the compressor status changed from OFF to ON, ON status continues for
10 minutes.
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