Mitsubishi Electric CAHV-P500YB-HPB, Service Handbook

Page: 98 / 169

[
VII
Control ]
- 91 -
HWE15070 GB
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.)
Compressor Frequency Control
-6- Injection LEV
Operating range of the LEV
Opening range: 50-480 (fully open)
LEV operation speed
 Open 133 plus/sec
 Close 200 plus/sec
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, LEV2 (Injection LEV) opening will be controlled every 30 seconds to approximate the dis-
charge 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.)
Fan rotation
speed (rpm)
Frequency (Hz) Outdoor temp.(A)
(°C)
Fan rotation
speed (rpm)
Frequency
(Hz)
Outdoor temp.(A)
(°C)
270 31 37 < A ≤ 40 450 50 12 < A ≤ 17
300 34 32 < A ≤ 37 490 55 7 < A ≤ 12
330 37 27 < A ≤ 32 550 60 2 < A ≤ 7
370 41 22 < A ≤ 27 600 66 0 < A ≤ 2
410 45 17 < A ≤ 22 670 73 A ≤ 0
Target discharge SH (Item code c31: Discharge gas temp. - discharge pressure saturation temperature)
Refer to Chapter IX [1] 2. "Checking the sensor status." (page 115)
Outlet water temperature (B) (°C)
Outside temp.(A) (°C)
≤ -20
-20< A ≤ -17 -17< A ≤ -14 -14< A ≤ -11 -11< A ≤ -8
B ≤ 45 20-35* 20-35* 20-35* 20-35* 35
45 < B ≤ 50 20-30* 20-30* 20-30* 20-30* 30
50 < B ≤ 55 20-25* 20-25* 20-25* 20-25* 25
55 < B ≤ 60 20 20 20 20 20
60 < B ≤ 65 20 20 20 20 20
65 < B 20 20 20 20 20
Outlet water temperature (B) (°C)
Outside temp.(A) (°C)
-8< A ≤ -5 -5< A ≤ -2 -2< A ≤ 1 1< A ≤ 5 5< A
B ≤ 45 40 45 50 55 close
45 < B ≤ 50 35 40 45 50 close
50 < B ≤ 55 30 35 40 45 close
55 < B ≤ 60 25 30 35 40 close
60 < B ≤ 65 23 26 30 35 close
65 < B 20 23 27 32 close
*The target discharge SH will vary, depending on the operating frequency of the compressor.
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