Control Specification
SiMT041509E
35
Function 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 preheating command from
the indoor unit, the outdoor temperature, the discharge pipe temperature, and the radiation fin
temperature.
Detail
ON Condition
Outdoor temperature < 20°C
Discharge pipe temperature < outdoor temperature × 238/256 + 32.5°C
Radiation fin temperature < 85°C
OFF condition
Outdoor temperature > 22°C
Discharge pipe temperature > outdoor temperature × 238/256 + 37°C
Radiation fin temperature
≥
90°C
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.
3.3.3 Four Way Valve Operation Compensation
Outline
At the beginning of operation as the four way valve is switched, the pressure difference to
activate the four way valve is acquired when the output frequency is higher than a certain fixed
frequency, for a certain fixed time.
Detail
Starting Conditions
1. When the compressor starts and the four way valve switches from OFF to ON
2. When the four way valve switches from ON to OFF during operation
3. When the compressor starts after resetting
4. When the compressor starts after the fault of four way valve switching
The lower limit of frequency keeps
A
Hz for
B
seconds with any conditions 1 through 4 above.
When the outdoor temperature is above
C
°
C in heating, the frequency decreases depending on
the outdoor temperature.
3.3.4 3-Minute Standby
Turning on the compressor is prohibited for 3 minutes after turning it off.
(The function is not activated when defrosting.)
Cooling
Heating
A
(Hz)
48
38
B
(seconds)
70
C
(°C)
15
Summary of Contents for FTK(X)M-P Series
Page 16: ...SiMT041509E 1 List of Functions Part 1 List of Functions 1 Functions 2...
Page 18: ...SiMT041509E 3 Specifications Part 2 Specifications 1 Specifications 4...
Page 59: ...SiMT041509E Remote Controller 44 Part 5 Remote Controller 1 Remote Controller 45...
Page 118: ...Revision History Month Year Version Revised contents 07 2015 SiMT041509E First edition...
