Controls At Mode Changing / Start-Up - Daikin CTXS09GVJU Service Manual

SiUS12-814
3.3

Controls at Mode Changing / Start-up

3.3.1 Preheating Operation
Outline
Operate the inverter in the open phase operation with conditions including the preheating
command from the indoor temperature, the outdoor air temperature, and the discharge pipe
temperature.
Detail Preheating ON Condition
OFF Condition
3.3.2 Four-Way Valve Switching
Outline of heating Heat Pump Only
operation 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 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
Starting Conditions
1. When starting compressor for heating.
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 ON.
3.3.4 3-Minute Standby
Do not turn ON the compressor for 3 minutes after turning it off, except when defrosting. This
pertains only to Heat Pump Models.
3.3.5 Compressor Protection Function
When turning the compressor from OFF to ON, the upper limit of frequency must be set as shown
in the following diagram: The function must not be used when defrosting (only for heat pump
model).
FCG 3
FCG 2
FCG 1
Function and Control
When outdoor air temperature is below 51°F and discharge pipe temperature is below 51°F,
inverter in open phase operation starts.
When outdoor air temperature is higher than 54°F or discharge pipe temperature is higher than
54°F, inverter in open phase operation stops.
Set the lower limit frequency to 18 class: 55, 32 class : 28 (model by model) Hz for 70 seconds
with the OR conditions with 1 through 4 above.
80
65
55
Control Specification
43