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Control Specification
SiUS041501E
37
Function and Control
3.3
Controls at Mode Changing / Start-up
3.3.1 Preheating Operation
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.
Detail
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. (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.
Detail
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 FTKN09NMVJU
Page 12: ...SiUS041501E 1 List of Functions Part 1 List of Functions 1 Functions 2...
Page 59: ...SiUS041501E Remote Controller 48 Part 5 Remote Controller 1 Cooling Only 49 2 Heat Pump 51...
Page 65: ...SiUS041501E Service Diagnosis 54 5 13 Power Module Check 100...
Page 132: ...Revision History Month Year Version Revised contents 03 2015 SiUS041501E First edition...