Mitsubishi Electric CAHV-R450YA-HPB Service Manual page 108

[ VII Control ]
Bypass Control
-5- Outdoor unit fan
The fan's rotation speed will be controlled to approximate the values in the table below that are obtained based on the outside
temperature and the low pressure.
(Pressures and temperatures will be monitored, and the fan frequency will change accordingly in three steps.)
Fan rotation
speed (rpm)
277
304
334
367
403
443
Compresso r Frequency Control
-6- Injection LEV
Operating range of the LEV
Opening range: 60-480 (fully open)
At startup
For one minute after startup, the valve will be fixed to Initial Setting 1.
Between one and five minutes after startup, the valve will be fixed to Initial Setting 2.
During operation
Five or more minutes after startup, Injection LEV opening will be controlled every 30 seconds to approximate the discharge
SH to the target value according to the changes in high pressure and discharge gas temperature.
(Refer to the table below for the target discharge SH values.)
Target discharge SH (Item code c31: Discharge gas temp. - discharge pressure saturation temperature)
Refer to Chapter X [1] 2. "Checking the sensor status." (page 129)
Outlet water temperature (B) (°C)
B ≤ 45
45 < B ≤ 50
50 < B ≤ 55
55 < B ≤ 60
60 < B ≤ 65
65 < B
Outlet water temperature (B) (°C)
B ≤ 45
45 < B ≤ 50
50 < B ≤ 55
55 < B ≤ 60
60 < B ≤ 65
65 < B
*The target discharge SH will vary, depending on the operating frequency of the compressor.
HWE22020
Frequency (Hz) Outdoor temp.(A)
(°C)
28 42 < A
30 37 < A ≤ 42
33 32 < A ≤ 37
37 27 < A ≤ 32
40 22 < A ≤ 27
44 17 < A ≤ 22
≤ -20
20-28*
20-30*
20-32*
20-32*
20-32*
20-28*
-8< A ≤ -5
20-28*
20-30*
20-32*
20-32*
20-32*
20-28*
Fan rotation
speed (rpm)
488
537
600
651
718
780
Outside temp.(A) (°C)
-20< A ≤ -17 -17< A ≤ -14
20-28* 20-28*
20-30* 20-30*
20-32* 20-32*
20-32* 20-32*
20-32* 20-32*
20-28* 20-28*
Outside temp.(A) (°C)
-5< A ≤ -2 -2< A ≤ 1
20-28* 20-27*
20-28* 20-27*
20-28* 20-27*
20-28* 22-27*
21-28* 23-28*
21-28* 24-28*
- 99 -
Frequency (Hz) Outdoor temp.(A)
(°C)
49 12 < A ≤ 17
54 10 < A ≤ 12
60 8 < A ≤ 10
65 4 < A ≤ 8
72 2 < A ≤ 4
78 A < 2
-14< A ≤ -11 -11< A ≤ -8
20-28*
20-30*
20-32*
20-32*
20-32*
20-28*
1< A ≤ 5
12-24*
16-24*
20-24*
22-26*
24-27*
26-28*
20-28*
20-30*
20-32*
20-32*
20-32*
20-28*
5< A
10-17*
14-22*
18-22*
22-24*
26
28
GB