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SiUS04-904
Control Specification (09/12 Class)
Function and Control
39
When the discharge pipe temperature is higher than 54ºF, inverter in open phase operation
stops.
3.3.2 Four-Way Valve Switching
Outline
During the heating operation the valve must be energized, and during cooling and defrosting,
current must not be energized. In order to eliminate the switching sound (as the four-way valve coil
switches from ON to OFF) when the heating operation is stopped, the delay switch of the four-way
valve must be carried out after the operation has stopped.
Detail
The OFF delay of four-way valve
Energize the coil for 160 seconds after unit operation is stopped.
3.3.3 Four-Way Valve Operation Compensation
Outline
At the beginning of the operation as the four way valve is switched, acquire the differential pressure
required for activating the four-way valve by the operating frequency output, which is more than a
certain fixed frequency, for a certain fixed time.
Detail
Starting Conditions
1. When starting compressor for heating.
2. When the operating mode changes to cooling from heating.
3. When starting compressor for rushing defrosting or resetting.
4. When starting compressor for the first time after the reset with the power is ON.
5. When starting compressor for heating next to the suspension of defrosting.
6. When starting compressor next to the fault of switching over cooling / heating.
Set the lower limit frequency to 68 (model by model) Hz for 45 seconds with any conditions 1
through 6 above.
Summary of Contents for FTXS09HVJU
Page 1: ...SiUS04 904 Applied Models Inverter Pair Heat Pump Inverter Pair Wall Mounted Type H Series...
Page 9: ...Safety Considerations SiUS04 904 viii Safety Considerations...
Page 10: ...SiUS04 904 List of Functions 1 Part 1 List of Functions 1 Functions 2...
Page 72: ...Control Specification 15 18 24 Class SiUS04 904 62 Function and Control...
Page 77: ...FTXS09 12HVJU SiUS04 904 66 Operation Manual...
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