Daikin ARK25BVMB, Service Manual

Page: 57 / 201

Control Specification SiBE04-302
48 Function and Control
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 (only for heat pump model) from the indoor, the outdoor air temperature and
discharge pipe temperature.
Detail Preheating ON Condition
„
When outdoor air temperature is below 10.5ºC and discharge pipe temperature is below
10.5ºC, inverter in open phase operation starts.
OFF Condition
„
When outdoor air temperature is higher than 12ºC or discharge pipe temperature is higher
than 12ºC, inverter in open phase operation stops.
3.3.2 Four Way Valve Switching
Outline of
Heating
Operation Heat Pump Only
During the heating operation current must not be conducted and during cooling and defrosting
current must be conducted. In order to eliminate the switching sound (as the four way valve coil
switches from ON to OFF) when the cooling 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 150 sec after unit operation is stopped.
3.3.3 Four Way Valve Operation Compensation
Outline Heat Pump Only
At the beginning of the operation as the four way valve is switched, acquire the differential
pressure required for activating the four way valve by having output the operating frequency,
which is more than a certain fixed frequency, for a certain fixed time.
Detail Staring Conditions
1. When starting compressor for cooling.
2. When the operating mode changes from the previous time.
3. When starting compressor for rushing defrosting or resetting.
4. When starting compressor for the first time after the reset with the power is ON.
Set the lower limit frequency to 66 (model by model) Hz for 45 seconds with the OR
conditions with 1 through 4 above.
3.3.4 3 Minutes Stand-by
Prohibit to turn ON the compressor for 3 minutes after turning it off.
(Except when defrosting. (Only for Heat Pump Model).)
3.3.5 Compressor Protection Function
When turning the compressor from OFF to ON, the upper limit of frequency must be set as
follows. (The function must not be used when defrosting (only for heat pump model).)
FCG 3
FCG 2
FCG 1
TCG 1
TCG 2
TCG 3
94
96
50
240
240
120