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

Control Specification
4.4

Controls at Mode Changing/Start-up

4.4.1 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.
Details
ON Condition
 When the outdoor temperature is below A, the inverter operation in open phase starts.
OFF Condition
 When the outdoor temperature is higher than B, the inverter operation in open phase stops.
A
B
4.4.2 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 150 seconds after the operation is stopped.
4.4.3 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.
Details Starting Conditions
 The compressor starts and the four way valve switches from OFF to ON
 The four way valve switches from ON to OFF during operation
 The compressor starts after resetting
 The compressor starts after the fault of four way valve switching
The lower limit of frequency keeps A Hz for 70 seconds for any of the conditions above.
A (Hz)
4.4.4 3-Minute Standby
Turning on the compressor is prohibited for 3 minutes after turning off.
The function is not used when defrosting.
100
2/3/4MXS
°C °F
20 68
22 71.6
2MXS
Cooling 74
Heating 62
5MXS 2/3MXL(H)
°C °F °C
6 42.8 6
7.5 45.5 8
3/4MXS 5MXS
42 32
35 26
SiUS122226E
4MXL(H)
°F °C °F
42.8 6 42.8
46.4 7.5 45.5
2/3MXL(H) 4MXL(H)
42 32
26 26
Part 4 Functions and Control