Daikin FTXR-T Series Service Manual page 51

SiUS041829E
D signal for cooling
–2.0°C (–3.6°F)
–1.5°C (–2.7°F)
–1.0°C (–1.8°F)
–0.5°C (–0.9°F)
OFF = Thermostat OFF
D signal for heating
–1.5°C (–2.7°F)
–1.0°C (–1.8°F)
–0.5°C (–0.9°F)
OFF = Thermostat OFF
PI Control
1. P control
2. I control
3. Frequency control when other controls are functioning
4. Upper and lower limit of frequency by PI control
Part 4 Functions and Control
D
Temperature Temperature
difference signal
OFF
1 0.5°C (0.9°F)
2 1.0°C (1.8°F)
3 1.5°C (2.7°F)
D
Temperature Temperature
difference signal
OFF
0.5°C (0.9°F)
1 1.0°C (1.8°F)
2 1.5°C (2.7°F)
0°C (0°F) 3 2.0°C (3.6°F)
The D value is calculated in each sampling time (20 seconds), and the frequency is adjusted
according to its difference from the frequency previously calculated.
If the operating frequency does not change for more than a certain fixed time, the frequency is
adjusted according to the D value.
When D value is low, the frequency is lowered.
When D value is high, the frequency is increased.
 When frequency is dropping:
Frequency control is carried out only when the frequency drops.
 For limiting lower limit:
Frequency control is carried out only when the frequency rises.
The frequency upper and lower limits are set according to the command of the indoor unit.
When the indoor or outdoor unit quiet operation command comes from the indoor unit, the upper
limit frequency is lower than the usual setting.
D
Temperature
difference signal difference
0°C (0°F) 4 2.0°C (3.6°F)
5 2.5°C (4.5°F)
6 3.0°C (5.4°F)
7 3.5°C (6.3°F)
D
Temperature
difference signal difference
4 2.5°C (4.5°F)
5 3.0°C (5.4°F)
6 3.5°C (6.3°F)
7 4.0°C (7.2°F)
Control Specification
D
Temperature
signal difference signal
8 4.0°C (7.2°F)
9 4.5°C (8.1°F)
10 5.0°C (9.0°F)
11 5.5°C (9.9°F)
D
Temperature
signal difference signal
8 4.5°C (8.1°F)
9 5.0°C (9.0°F)
10 5.5°C (9.9°F)
11 6.0°C (10.8°F)
D
12
13
14
15
D
12
13
14
15
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