Controls At Mode Changing / Start-Up - Daikin ATXS35EV1B7 Service Manual

Control Specification
3.3

Controls at Mode Changing / Start-up

3.3.1 Preheating Operation
Outline
Operate the inverter in the open phase operation with the conditions including the preheating
command from the discharge pipe temperature.
Operate the inverter in the open phase operation with the conditions including the outdoor air
temperature, discharge pipe temperature, and fin temperature (internal temperature of PM1).
Detail
Preheating ON Condition
OFF Condition
Outside temperature ≥ 10°C → Control A (preheating for normal state)
Outside temperature < 10°C → Control B (preheating of increased capacity)
Control A
Control B
Fin temperature ≥ 90°C
3.3.2 Four Way Valve Switching
Outline Heat Pump Only
During the heating operation current must be conducted and during cooling and defrosting
current must not be 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 delay switch of the four way
valve must be carried out after the operation stopped.
Detail The OFF delay of four way valve
Energize the coil for about 160 sec after unit operation is stopped.
34
25/35 class
50 class
25/35 class
When the discharge pipe temperature is below 10ºC, inverter in open phase operation
starts. (The power consumption of compressor during preheat operation is 35 W.)
When the discharge pipe temperature is higher than 12ºC, inverter in open phase operation
stops.
50 class
ON condition
Discharge pipe temperature < 6°C
Fin temperature < 85°C
OFF condition
Discharge pipe temperature > 8°C
Fin temperature ≥ 90°C
ON condition
Discharge pipe temperature < 10.5°C
Fin temperature < 85°C
OFF condition
Discharge pipe temperature > 12°C
SiBE04-824
Function and Control