Service manual

SiUS28-902_a Special Control
Function 28
3.7 Pressure Equalization Prior to Startup
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 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 ⎯
Subcooling electronic expansion valve (EV2) 0 pls ⎯
Hot gas bypass valve (SVP) ON ⎯
Receiver gas discharging valve (SVG) OFF ⎯
Ending conditions
• • 3 min.
• • Pc-Pe<29 psi
⎯
or