6/14
05.2018Manufacturer reserves the right to change at any time for specifications or designs without notice and incurring obligations.
ESI Outdoor Unit Function and control
2.2 Basic control
Actuator Operation Remark
Compressor
Apply Compressor PI control
load of the room.
High pressure protection control,
Low pressure protection control,
Discharge temperature protection control,
Compressor operating frequency upper limit control
with inverter protection control.
Outdoor fan Cooling fan control -
Four way valve OFF -
Electronic
expansion valve 480pls -
2.2.1 Cooling control (including cooling oil return)
Actuator Operation Remark
Compressor
Apply Compressor PI control
to maintain Tcs according to
load of the room.
High pressure protection control,
Low pressure protection control,
Discharge temperature protection control,
Compressor
operating frequency upper limit control
with inverter protection control.
Outdoor fan Heating fan control -
Four way valve ON -
Electronic
expansion valve PI control to maintain
discharge superheat -
2.2.2 Heating control (including heating oil return)
*Te: Low pressure equivalent saturation temperature(F)
Tes: Target Te value (Varies depending on mode choice, silent setting, etc.)
*Tc: High pressure equivalent saturation temperature(F)
Tcs: Target Tc value (Varies depending on mode choice, silent setting, etc.)
SEG1 SEG2 SEG3
Test mode7 (high frequency)
→State Code (SEG3): 7
SEG1 SEG2 SEG3
Test mode8 (low frequency)
→State Code (SEG3): 8
