:
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
24
Basic Control
NORMAL OPERATION
Table 24 —Cooling Operation
Table 25 —Heating Operation
NOTE: Heating operation is not functional at an outdoor air temperature of 77°F or more.
LEGEND:
INV – Inverter
SV – Solenoid Valve
COMPONENT NORMAL OPERATION REMARK
Compressor (INV) Capacity demand control To build pressure difference
Outdoor Unit fan (FAN) Cooling fan control -
4-Way Valve OFF -
Electronic Expansion Valve (EEV) Discharge temperature control Adjust refrigerant flow rate to protect compressor
Fast Oil Return Valve (SV4) 17 minutes OFF then 3 minutes ON -
Hot Gas Bypass Valve (SV5) OFF -
Spraying Liquid Valve (SV6) Discharge temperature protection control -
COMPONENT NORMAL OPERATION REMARK
Compressor (INV) Capacity demand control To build pressure difference
Outdoor Unit fan (FAN) Heating fan control -
4-Way Valve ON -
Electronic Expansion Valve (EEV) Discharge temperature control Adjust refrigerant flow rate to protect compressor
Fast Oil Return Valve (SV4) 17 minutes OFF then 3 minutes ON -
Hot Gas Bypass Valve (SV5) OFF
Open based on conditions at startup stage (after defrosting
and oil return operation)
Spraying Liquid Valve (SV6) Discharge temperature protection control -
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