Special Control
SiUS28-902_B
22
Function
3.6
Stopping Operation
Operation of the actuator when the system is down, is cleared up.
3.6.1 When System is in Stop Mode
3.7
Pressure Equalization Prior to Startup
Ta: Outdoor air temperature
Pc: High-pressure sensor detection value
Pe: Low-pressure sensor detection value
Before activating the compressor, the activation load is lightened by equalization across the
compressor. In addition, inverters turn on electricity and capacitors are charged.
Actuator
Operation
Compressor
OFF
Outdoor unit fan
OFF
Four
-
way valve
Keep former condition.
Main electronic expansion valve (EV1)
0 pls
Hot
-
gas bypass valve (SVP)
OFF
Receiver gas discharging valve (SVG)
OFF
Ending conditions
Indoor unit thermostat is turned ON.
Actuator
Operation
Remarks
Compressor
OFF
Outdoor unit fan
Cooling: OFF
Heating: Ta > 78.8°F; STEP 8,
Ta
78.8°F; OFF
Four-way valve
Keep former condition.
Main electronic expansion valve (EV1)
0 pls
Hot gas bypass valve (SVP)
ON
Receiver gas discharging valve (SVG)
OFF
Ending conditions
3 minutes
Pc – Pe < 29 psi
OR
