3-Step Thermostat Processing (Fxtq-Ta, Fxtq-Tb Models) - Daikin VRV Aurora RXLQ-TATJU Series Service Manual

Outline of Control (Indoor Unit)
9.14 3-Step Thermostat Processing (FXTQ-TA, FXTQ-TB
Models)
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 as follows.
Thermostat step 2, 3: Auxiliary electric heater control
Thermostat step 1, 2: Heat pump lockout control
For more details of the heater, refer to Heater Control (FXTQ-TA, FXTQ-TB Models) on page
129.
Detail
• Thermostat step 1: OFF
• Thermostat step 2: OFF
• Thermostat step 3: OFF
(1) Cooling
ON
Thermostat step 2
OFF
Thermostat step 1
ON
OFF
A (∗4)
Set temperature (Ts')
Note(s)
1. S value varies automatically based on the room temperature trend.
2. Ton + S > –B (°C), Toff + S < A (°C)
3. For parameters, refer to page 153.
4. A and B values vary automatically based on the field setting 12 (22)-2.
5. If, directly after a change in conditions, it is such that the thermostat could be either ON or OFF
(controlled temperature is within ranges A and B), the thermostat will be switched to ON.
133
• No errors (except errors in which the system keeps operating)
has occurred.
&
• Remote controller ON
Other conditions
2+S (∗1)
4+S (∗1)
B (∗4)
Controlled temperature
(Tcon)(°C)
Perform the processing in
the following chart. (∗5)
(2) Heating
Thermostat step 3
ON
1.5
OFF
Thermostat step 2
ON
Ton+S
OFF
(∗1,2,3)
ON
Thermostat step 1
OFF
SiUS341802EC
1.5
Toff+S (∗1,2,3)
B (∗4) A (∗4)
Controlled
temperature
Set temperature (Ts')
(Tcon)(°C)
Part 4 Functions and Control