Compressor Overheat Protection - Mitsubishi Heavy Industries SRK20ZSPR-S Technical Manual

(h) Heating low outdoor temperature protective control
(i) Operating conditions: When the outdoor air temperature (TH2) is lower than 4℃ or higher continues for 30 seconds
(ii) Detail of operation:
-12 -10
Note(1) Values in ( ) are for the model SRK63.
3) 3) Reset conditions: Reset conditions:
(iii) Reset conditions:
a) a) The outdoor air temperature (TH2) becomes 6ºC. The outdoor air temperature (TH2) becomes 6ºC.
1) The outdooe air temperature (TH2) becomes 6℃.
b) b) The compressor command speed is 0 rps. The compressor command speed is 0 rps.
2) The compressor command speed is 0 rps.
(i) (i)

Compressor overheat protection

Compressor overheat protection
(i) (i) Purpose: Purpose:
(ii) Detail of operation
(ii) Detail of operation
1) 1)
(Example) Fuzzy (Example) Fuzzy
Model
Model
Lower limit speed
Lower limit speed
2)
2)
(j) (j) Current safe Current safe
(i) (i) Purpose: Purpose:
(ii) Detail of operation:
(ii) Detail of operation:
(k) Current cut (k) Current cut
(i) (i) Purpose: Purpose:
(ii) (ii) Detail of operation: Detail of operation:
(l) Outdoor unit failure (l) Outdoor unit failure
while the compressor command speed is other than 0 rps.
The lower limit compressor command speed is change as shown in the figure below.
-8 -6 -4 -2 4
Outdoor air temperature (°C)
When either of the following condition is satisfied. When either of the following condition is satisfied.
When either of the following condition is satisfied.
95
95
Discharge pipe temperature (˚C) Discharge pipe temperature (˚C)
95-105
95-105
Item Item
Cooling Cooling
25 rps
25 rps
115 115
Lower limit 60 rps
Lower limit 50(45) rps
Lower limit 40(45) rps
Lower limit 35 rps
Normal operation
6
180 180
180
180
180
180
105
105
105-115 105-115
95-105 95-105
Heating Heating
32 rps
32 rps
89
- -
'17 • SRK-T-206
'09•SRK-DB-087D '09•SRK-DB-087D
115
115
180 180
180 180