Step Thermostat Processing (Fxtq) - Daikin VRV-WIII RWEYQ72PTJU Service Manual

Outline of Control (Indoor Unit)
1: Fixing of the fan H tap.
Note:
2: The heater backup prohibiting conditions are prioritized. Even when the heater ON conditions
3: The operation must continue for a certain period of time after the heater turns OFF.

9.11 4 Step Thermostat Processing (FXTQ)

[Outline]
The thermostat ON/OFF for the indoor unit is controlled in accordance with [Thermostat Step 1].
The heater ON/OFF operation during heating is controlled in accordance with [Thermostat Step 2,
3, or 4] or [Thermostat Step 1, 2, or 3].
For more details of the heater, see "9.10 Heater Control (FXTQ)".
[Detail]
• [Thermostat step 1] = "OFF"
• [Thermostat step 2] = "OFF"
• [Thermostat step 3] = "OFF"
• [Thermostat step 4] = "OFF"
Cooling
∗1: This value varies according to the field setting
ON
[Thermostat step 2]
OFF
[Thermostat step 1]
ON
OFF
∗1
1 1
Set temperature
78
Condition A
• Heating mode
• Thermostat step 1 = "ON"
• Not during fan residual operation
&
OR
&
• Hot-water heater = "1" (ON)
Condition B
• Elimination of Condition A
• Indoor unit error [Stop due to error]
• Indoor unit error [Abnormal stop]
OR
• Indoor unit error [Remote control thermistor error]
• Indoor unit error [Suction air thermistor error]
• During defrosting or oil return operation
are met, the heater is turned OFF when the prohibiting conditions are met.
4: The thermostat steps for this control comply with the "9.11 4 Step Thermostat Processing
(FXTQ)".
• Drain pump abnormal output = OFF
• Thermostat OFF error has not occurred.
• Forced thermostat OFF = "0" (OFF)
• Normal operation = ON
&
• Remote control operation mode = "Heating"
OR
• Not during anti-freeze operation
Elimination conditions of the above
3.6
7.2
∗1
Controlled temperature (˚F)
• [Electrical heater setting] = "01"
• [Electrical heater setting] = "03"
Perform the processing
in the following chart.
Heating
∗1: This value varies according to the field setting
ON
[Thermostat step 4]
OFF
ON
[Thermostat step 3]
OFF
ON
[Thermostat step 2]
OFF
ON
[Thermostat step 1]
OFF
Heater backup prohibiting
conditions ∗2
2.7 2.7
2.7 2.7
<Ttsoff>
<Ttson>
∗1 ∗1
Controlled
1 1
temperature (˚F)
Set temperature
Function and Control
SiUS30-1301