Controls At Mode Changing / Start-Up - Daikin FLKS25BVMB 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 (only for heat pump model) from the indoor, the outdoor air temperature and
discharge pipe temperature.
Detail
Preheating ON Condition
OFF Condition
3.3.2 Four Way Valve Switching
Outline of Heat Pump Only
During the heating operation current must not be conducted and during cooling and defrosting
Heating
current must be conducted. In order to eliminate the switching sound (as the four way valve coil
Operation
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.
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).)
34
When outdoor air temperature is below 10.5ºC and discharge pipe temperature is below
10.5ºC, inverter in open phase operation starts.
When outdoor air temperature is higher than 12ºC or discharge pipe temperature is higher
than 12ºC, inverter in open phase operation stops.
Set the lower limit frequency to 66 (model by model) Hz for 45 seconds with the OR
conditions with 1 through 4 above.
FCG 3 94
FCG 2 96
FCG 1 50
TCG 1 240
TCG 2 240
TCG 3 120
Frequency
FCG 3
FCG 2
FCG 1
TCG1sec
SiBE05-311
TCG2sec TCG3sec
(R2949)
Function and Control
Time