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66
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(7) Heating low outdoor temperature protective control
• Models : 20 , 35
(a)
Operating conditions:
When the outdoor air temperature (TH2) is lower than -10ºC or higher continues for 30 seconds
while the compressor command speed is other than 0 rps.
(b)
Detail of operation:
The lower limit compressor command speed is change as shown in the figure below.
(c) Reset conditions:
When either of the following condition is satisfied.
1) The outdoor air temperature (TH2) becomes -7ºC.
2) The compressor command speed is 0 rps.
-10
-7
Lower limit 45 rps
Normal operation
Outdoor air temp.(°C)
• Model 50
(a) Operating conditions:
When the outdoor air temperature (TH2) is lower than 4ºC or 13ºC or higher continues for 30
seconds while the compressor command speed is other than 0 rps.
(b) Detail of operation:
The lower limit compressor command speed is change as shown in the figure below.
(c) Reset conditions:
When either of the following condition is satisfied.
1) The outdoor air temperature (TH2) becomes 6ºC ~ 11ºC.
2) The compressor command speed is 0 rps.
-8
-6
Lower limit 45 rps
Lower limit 32 rps
Normal operation
4
6
11
13
Outdoor air temp.(°C)
(8) Compressor overheat protection
(a) Purpose:
It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the
compressor overheat.
(b) Detail of operation
1)
Speeds are controlled with temperature detected by the sensor mounted on the discharge pipe.
Notes (1) When the discharge pipe temperature is in the range of 100~110ºC (model 50 : 105~115ºC), the speed is reduced by 4 rps.
(2) When the discharge pipe temperature is raised and continues operation for 20 seconds without changing, then the speed is reduced again by 4 rps.
(3) If the discharge pipe temperature is in the range of 90~100ºC (model 50 : 95~105ºC) even when the compressor command speed is maintained for
3 minutes when the temperature is in the range of 90~100ºC (model 50 : 95~105ºC), the speed is raised by 1 rps and kept at that speed for 3
minutes. This process is repeated until the command speed is reached.
(4) Lower limit speed
Discharge pipe temperature (˚C)
Lower limit
(4)
After lapse of 3 min. or over
(3)
After lapse of 3 min. or over
(3)
After lapse of 3 min. or over
(3)
4 rps
4 rps
(1)
0 rps
100 (105)
110 (115)
• Figures in ( ) are for
model 50.
(Example) Fuzzy
90 (95)
Cooling
Heating
Lower limit speed
25,35
20 rps
30 rps
25 rps
32 rps
Item
Model
50