Controls At Mode Changing / Start-Up - Daikin 3MKS50E3V1B Service Manual

SiBE121135
4.3

Controls at Mode Changing / Start-up

4.3.1 Preheating Operation
Outline The inverter operation in open phase starts with the conditions of the preheating command from
the outdoor unit.
Detail
ON Condition
OFF Condition
4.3.2 Four Way Valve Switching
Outline
In heating operation, current is conducted, and in cooling and defrosting operation, current is
not conducted. 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.
4.3.3 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 by having output frequency which is more than a certain
fixed frequency, for a certain fixed time.
Detail
Starting Conditions
1. When starting the compressor for heating
2. When the operation mode changes from the previous time
3. When starting the compressor for defrosting
4. When starting the compressor for the first time after resetting with the power ON.
40/50/52/58 class
68/75 class
80/90 class
4.3.4 3-Minute Standby
Turning on the compressor is prohibited for 3 minutes after turning off.
(Except when defrosting.)
Function and Control
When the outdoor temperature is below 10.5°C, the inverter operation in open phase starts.
When the outdoor temperature is higher than 12°C, the inverter operation in open phase
stops.
The lower limit of frequency keeps
above.
A (Hz)
48
40
28
Hz for 70 seconds with any conditions 1 through 4
A
Control Specification
111