(4) Heating high pressure control
(a) Starting condition
When the indoor heat exchanger temperature (Th2) has risen to a specified temperature while the compressor is turned on.
(b) Operating condition
Compressor speed is controlled according to the zones of indoor heat exchanger temperature as shown by the following table.
Th2 < P1
P1
<=
Th2 < P2
P2
<=
Th2 < P3
P3
<=
Th2 < P4
P4
<=
Th2
Protection control speed (NP)
Normal
Retention
NP–4rps
NP–8rps
NP
＝
0
Sampling time (s)
Normal
20
20
20
Normal
Th2
NP
P1
P2
P3
P4
10
<=
NP < 115
45
52
56
58
115
<=
NP < 120
45 – 43
52 – 50
56 – 54
58
120
<=
NP
43
50
54
58
Unit: °C
(a) Operating conditions
When the outdoor air temperature (Tho-A
) is 22°C or lower continues for 20 seconds while compressor speed is other than 0 rps.
(b) Detail of operation
(i)
The lower limit of compressor speed is set to 35 or 45 rps and even if the speed becomes lower than 35 or 45 rps, the
speed is kept to 35 or 45 rps. However, when the thermostat OFF, the speed is reduced to 0 rps.
(ii)
The upper limit of compressor speed is set to 75 or 60 rps, the speed is kept to 75 or 60 rps.
(c) Reset conditions
When the either of the following conditions is satisfied.
(i)
When the outdoor air temperature (Tho-A) becomes 25°C or higher.
(ii)
When the compressor speed is 0rps.
(3) Cooling low outdoor temperature protective control
Outdoor air temperature(°C)
(b) Detail of operation
(c) Reset conditions
(2) Cooling high pressure control
(a) Purpose
(b) Detector
(c) Detail of operation
53
58
60
Outdoor heat exchanger temperature (°C)
8rps
(1)
8rps
(1)
0rps
After lapse of 30 sec. or over
(3)
After lapse of 30 sec. or over
(3)
After lapse of 30 sec. or over
(3)
Lower limit
speed 30 rps
(Example) Fuzzy
Tho-R
60
8
20
60
30 40
30 40
thermostat OFF, the speed is reduced to 0 rps.
(i)
(ii)
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192
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'16 • SCM-T-199
