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43
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'19 • PAC-SM-334
(5) Cooling overload protective control
(a) Operating conditions
(c) Reset conditions
(6) Cooling high pressure control
(a) Purpose
(b) Detector
(c) Detail of operation:
Outdoor heat exchanger temperature (°C)
(Example) Fuzzy
H
1)
2)
-C
B
-B
A
8
20
C
2
A
B
C
8rps
(1)
8rps
(1)
0rps
After lapse of 20 sec. or over
(3)
After lapse of 20 sec. or over
(3)
After lapse of 20 sec. or over
(3)
lower limit
speed 30 rps
(b) Detail of operation
Item
FDC90, 100VNP-W
Outdoor air temperature
Lower limit speed
Model
40
41
46
47
OFF
ON1
ON2
Outdoor air temperature ( )
C
º
40 rps
The lower limit of compressor speed is set to 30 or 40 rps and even if the calculated result becomes lower than that after
fuzzy calculation, the speed is kept to 30 or 40 rps. However, when the thermostat OFF, the speed is reduced to 0 rps.
(7) Cooling low outdoor temperature protective control
(a) Operating conditions
When the outdoor air temperature (TH2) is CºC or lower continues for 20 seconds while the compressor speed is
other than 0 rps.
(b) Detail of operation
(i) The lower limit of the compressor speed is set to 45 (35) <20> rps and even if the speed becomes lower than 45 (35)
<20> rps, the speed is kept to 45 (35) <20> rps. However, when the thermostat OFF, the speed is reduced to 0 rps.
(ii) The upper limit of the compressor speed is set to 75 <120> rps and even if the calculated result becomes higher
than that after fuzzy calculation, the speed is kept to 75 <120> rps.
Notes (1) Values in ( ) are for outdoor air temperature is C or D.
(2) Values in < > are for outdoor air temperature is E or F.
C
D
A
B
F
E
OFF
Upper limit 75 rps
Lower limit 45 rps
ON
ON
Upper limit 75 rps
Lower limit 35 rps
Outdoor air temperature (°C)
ON
Upper limit 120 rps
Lower limit 20 rps
●
Values of A, B, C, D, E, F
Model FDC90, 100VNP-W
(iii) Reset conditions
When either of the following condition is satisfied.
1) The outdoor air temperature (TH2) is F ºC or higher.
2) The
compressor speed is 0 rps.
(a) Starting condition
When the indoor heat exchanger temperature (Thi-R1,
R2) has risen to a specified temperature while the compressor
is turned on.
(b)
Compressor speed is controlled according to the zones of indoor heat exchanger temperature as shown by the
following table.
Thi-R < P1
P1
<=
Thi-R < P2 P2
<=
Thi-R < P3
P3
<=
Thi-R
Protection control speed (NP)
Normal
Retention
NP
－
4rps
NP
－
8rps
Sampling time (s)
Normal
10
10
10
Thi-R
P1
P2
P3
10
<=
NP < 90
45
52
57
90
<=
NP < 120
45 - 43
52 - 45
57 - 48
120
<=
NP
43
45
48
Unit: °C
(8) Heating high pressure control
NP
Model FDC90, 100VNP-W
Outdoor air temperature (˚C)
A
B
C
D
E
F
First time
9
11
22
25
26
28
