Heating Low Outdoor Temperature Protective Control - Mitsubishi Heavy Industries FDT40ZSXW1VH Service Manual

(7) Heating low outdoor temperature protective control

(a) Operating conditions
When the outdoor air temperature (TH2) is lower than 4℃ or higher continues for 30 seconds while the compressor
speed is other than 0 rps.
(b) Detail of operation
The lower limit compressor speed is change as shown in the figure below.
-12 -10
Outdoor air temperature (°C)
(c) Reset conditions
3) When either of the following condition is satisfied Reset conditions:
1) The outdoor air temperature (TH2) becomes 6 ℃.
a) The outdoor air temperature (TH2) becomes 6ºC.
2) The compressor speed is 0 rps.
b) The compressor command speed is 0 rps.
(8) Compressor overheat protection
(a) Purpose
(b) Detail of operation
1)
(Example) Fuzzy
the com
Lower limit speed
2)
(j) Current safe
(i) Purpose:
(ii) Detail of operation:
(k) Current cut
(i) Purpose:
(ii) Detail of operation:
-8 -6 -4 -2 4
When either of the following condition is satisfied
180
180
180
95
Discharge pipe temperature (˚C)
95-
95- 105
Cooling
25 rps
115
-
Lower limit 45 rps
Lower limit 45 rps
Lower limit 35 rps
Lower limit 35 rps
Normal operation
6
105
105- 115
105
Heating
32 rps
has elapsed
30
-
'19 • PAC-SM-302
115
180
180