Mitsubishi Heavy Industries SRK60ZSX-S Technical Manual page 49

d)
3) Reset conditions
The outdoor air temperature (TH2) is lower than 11°C.
• Model SRK50
(h) Heating low outdoor temperature protective control
1) Operating conditions
When the outdoor air temperature (TH2) is 11ºC or higher continues for 30 seconds while the compressor speed other than 0 rps.
(i) Operating conditions
When the outdoor air temperature (TH2) is lower than 4℃ or higher continues for 30 seconds while the compressor
2) Detail of operation
speed is other than 0 rps.
a) Taking the upper limit of compressor speed range at 78 rps, if the output speed obtained with the fuzzy calculation
(ii) Detail of operation
exceeds the upper limit, the upper limit value is maintained.
The lower limit compressor speed is change as shown in the figure below.
b) The lower limit of compressor speed is set to 30 rps and even if the calculated result becomes lower than that after
fuzzy calculation, the speed is kept to 30 rps. However, when the thermostat OFF, the speed is reduced to 0 prs.
c)
30
d)
Note(1) Values in ( ) are for the model SRK50, 60.
(iii) Reset conditions
3) Reset conditions:
When either of the following condition is satisfied.
a) 1) The outdooe air temperature (TH2) becomes 6℃. The outdoor air temperature (TH2) becomes 6ºC.
2) The compressor speed is 0 rps.
b) The compressor command speed is 0 rps.
(i) Compressor overheat protection
(i) Purpose
3) Reset conditions
The outdoor air temperature (TH2) is lower than 10°C.
(ii) Detail of operation
1)
(Example) Fuzzy
(h) Heating low outdoor temperature protective control
• Models SRK20 ~ 35
(i) Operating conditions:
(ii) Detail of operation:
(5) Values in ( ) are for the models SRK50, 60.
2)
(iii) Reset conditions:
1)
2)
(j) Current safe
• Model SRK50
(i) Purpose:
(i) Operating conditions: When the outdoor air temperature (TH2) is lower than 4ºC or 13ºC or higher continues for 30
(ii) Detail of operation:
(ii) Detail of operation:
Lower limit 29 rps
rps.
fan speed is 3rd (models SRK50, 60 : 2nd)
rps.
Protective
control
-12 -10 -8 -6 -4
Outdoor air temperature (°C)
When either of the following condition is satisfied.
95
95- 100(105)
Item
Model
Lower limit speed
-10 -8 -2
115
Outdoor air temperature(°C
seconds while the compressor command speed is other than 0 rps.
The lower limit compressor command speed is change as shown in the figure belo.
Lower limit 55 rps
Lower limit 45 rps
Lower limit 32(40) rps
Lower limit 20(35) rps
Item
Compressor speed
Normal operation
Low limit
30 rps
-2 4 6
ON1
ON2
30 rps
Protective control ON1
Normal operation
10
Outdoor air temperature(°C)
180
180
180
Discharge pipe temperature (˚C)
100(105)- 115
100(105)
95-
Lower limit 45 rps
Cooling Heating
Lower limit 40 rps
22(25) rps 32 rps
Normal operation
2
)
has elapsed
48
- -
Normal operation
Outdoor fan speed
Upper limit
78 rps
It depends on compressor speed
51 rps
Protective control ON2
11 19
100(105) 115
180
'17 • SRK-T-203
'09•SRK-DB-087D
2nd
20
180