Mitsubishi Heavy Industries FDU Series Service Manual page 43

(b) Ending conditions (Operation returns to the heating cycle when either one of the following is satisfied.)
(i) Outdoor heat exchanger sensor (TH1) temperature: 10ºC or higher.
(ii) Continued operation time of defrost operation → For more than 15 minutes.
(5) Cooling overload protective control
(5) Cooling overload protective control
(a) Operating conditions
(a) Operating conditions
When the outdoor air temperature (TH2) is 41°C or higher continues for 30 seconds than 0 rps.while the compressor speed is other
than 0 rps.
(b) Detail of operation
(i)
the upper limit, the upper limit value is maintained.
(ii)
Item
fuzzy calculation, the speed is kept to 30(40)rps. However, when the thermostat OFF, the speed is reduced to 0 prs.
Outdoor air temperature
Note (1) Values in ( ) are for outdoor air temperature at 47
Lower limit speed
(c) Reset conditions
(b) Detail of operation
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.
(c) Reset conditions
1)
2)
Heating low outdoor temperature protective control
(10)
(6) Cooling high pressure control
(a) Operating conditions
(a) Purpose
(b) Detail of operation
(b) Detector
(c) Detail of operation:
(Example) Fuzzy
• Defrost operation
Heating operation
Depends on an operation condition, the time can be longer than 7 minutes.
Model
FDC90, 100VNP-W
H 40ºC.
Upper limit 85rps
Lower limit 30rps
OFF
40 41 46
Outdoor air temperature(°C)
H 4
H
After lapse of 20 sec. or over
-1 1 4
Outdoor air temperature(°C)
After lapse of 20 sec. or over
After lapse of 20 sec. or over
A
Outdoor heat exchanger temperature (°C) Outdoor heat exchanger temperature (°C)
C
Outdoor air
2
temperature(TH2)
TH2 > = 32ºC
TH2 < 32ºC
-
Max. 15 minutes
85(60)rps
30(40)rps
40 rps
Upper limit 60rps
Lower limit 40rps
47
lower
Lower limit 45 rps
Lower limit 35 rps
Normal operation
(3) 8rps (1)
6
(3)
lower limit
(3)
speed 30 rps
B
B -C
A -B
Time after
A
compressor ON
Less than 10 min 50
Less than 15 min 50
Less than 20 min 50
Less than 25 min 50
25 min or more 50
— 51
42
-
'19 • PAC-SM-334
2-7 minutes
Hot start operation
calculation exceeds
ON1
than that after
OFF
40 41 46
Outdoor air temperature (
8rps (1)
0rps
C
8 20
B C
58
58
58 60
58
58
53 56
ON2
47
º C )