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(3) Fan control
Controls the fan speed based on the piping temperature (TH1) to perform cooling at low outdoor temperatures and heating
at high outdoor temperatures.
1) Control at cooling
1 When the compressor stops, the fan stops (fan output = 0 %).
2 When the power is turned on, or when the compressor is restated after it has been stopped for 30 minutes or
longer, the piping temperature ( TH1) determines the fan output.
When TH
When TH < 25 °C
3 When the compressor is restarted within 30 minutes after it has been stopped, the fan step before the compres-
sor was stopped is selected. However, when the fan output was under 30% when the fan was stopped, 30 % is
selected.
4 When the mode was changed from heating to cooling, the fan step conforms to item 2.
5 Two minutes after the fan is started, the fan step (number of units) is controlled every 30 seconds based on the
piping temperature (TH1).
6 When TH1 reaches 50 °C or higher, or when the control high pressure switch (63H2) tripped, the fan output
becomes 100 %.
7 Fan output while the compressor is operating is within the 20 % to 100 % range.
• FAN step
The following expression determines the next fan step count nj+1:
nj+1 = nj+∆nj
nj control
= >
• If nj+1
= <
• If nj+1
= >
• If TH1
FAN ∆nj
Target condensation
temperature 31 °C
20
50
25 °C
= >
Fan output = 100 %
Fan output = 60 %
nj: Current fan step, ∆nj: Displacement step amount
100 %
nj+1 = 100 %
20 %
nj+1 = 20 %
50 °C or 63H2 is "OFF"
t = 49
t > 49 °C
t > 46
= <
nj < 50
5
3
= <
= <
nj
100
10
4
* In the night mode, the maximum value of nj is 80%. (When TH1 < 50 °C)
nj+1 = 100 %
Condensation temperature TH1
t = 46
t = 43
t = 40
t = 36
t > 43
t > 40
t > 36
t > 33
2
2
2
2
3
2
2
2
–24–
Outputs are all %.
t = 33
t = 29
t = 26
t = 23
t > 29
t > 26
t > 23
t > 20
0
–2
–2
–3
0
–2
–2
–4
20 °C
= <
t
–5
–10
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Troubleshooting
