Control Specification
SiUS041829E
48
Part 4 Functions and Control
3.3 Controls at Mode Changing/Start-up
3.3.1 Preheating Control
Outline
The inverter operation in open phase starts with the conditions of the outdoor temperature, the
discharge pipe temperature, the radiation fin temperature and the preheating command from the
indoor unit.
Details
Outdoor temperature ≥ –2.5°C (27.5°F)
Control A (preheating for normal state)
Outdoor temperature < –2.5°C (27.5°F)
Control B (preheating of increased capacity)
Control A
ON condition
Discharge pipe temperature < 0°C (32.0°F)
Radiation fin temperature < 85°C (185°F)
OFF condition
Discharge pipe temperature > 2°C (35.6°F)
Radiation fin temperature ≥ 90°C (194°F)
Control B
ON condition
Discharge pipe temperature < 10°C (50.0°F)
Radiation fin temperature < 85°C (185°F)
OFF condition
Discharge pipe temperature > 12°C (53.6°F)
Radiation fin temperature ≥ 90°C (194°F)
3.3.2 Four Way Valve Switching
Outline
The four way valve coil is energized/not energized depending on the operation mode (Heating: ON,
Cooling/Dry/Defrost: OFF). In order to eliminate the switching sound as the four way valve coil
switches from ON to OFF when the heating is stopped, the OFF delay switch of the four way valve
is carried out.
Details
OFF delay switch of four way valve
The four way valve coil is energized for 160 seconds after the operation is stopped.
Summary of Contents for RX09RMVJU9
Page 17: ...SiUS041829E Part 2 Specifications 13 1 Specifications 14 Part 2 Specifications ...
Page 125: ...SiUS041829E Check Part 6 Service Diagnosis 121 18 class R25105 1 2 3 4 Multimeter ...
Page 127: ...SiUS041829E Check Part 6 Service Diagnosis 123 18 class R20704 W V U DC_P1 DC_N1 ...
Page 143: ...SiUS041829E Operation Limit Part 8 Appendix 139 4 Operation Limit RX09 12 18RMVJU9 3D092209E ...
