Controls At Mode Changing / Start-Up - Daikin 2MXS-N Series Service Manual

SiUS121502E
3.4

Controls at Mode Changing / Start-up

3.4.1 Preheating Control
Outline The inverter operation in open phase starts with the conditions of the outdoor temperature and the
preheating command from the indoor unit.
Detail ON Condition
OFF Condition
3.4.2 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 150 seconds after the operation is stopped.
3.4.3 Four Way Valve Operation Compensation
Outline At the beginning of the 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
18 class
24/36 class
3.4.4 3-Minute Standby
Turning on the compressor is prohibited for 3 minutes after turning off.
(The function is not used when defrosting.)
Function and Control
When the outdoor temperature is below 20°C (68°F), the inverter operation in open phase
starts.
When the outdoor temperature is higher than 22°C (71.6°F), the inverter operation in open
phase stops.
A (Hz) Cooling
74
42
Hz for 70 seconds with any conditions 1 through 4 above.
A
Heating
62
35
Control Specification
65