Mitsubishi Electric CMB-PW202V-J, Service Handbook

Page: 53 / 114

[
VI
Control ]
- 44 -
HWE09070 GB
[2] Controlling WCB
1. Control of SVM1
SVM turns on or off depending on the operation mode.
2. Control of LEV
LEV opening (sj) is controlled as follows depending on the operation mode.
Operation
mode
Cooling only Cooling main Heating only Heating main Defrost Stopped
SVM1 ON
Differential tem-
perature con-
trol
*1
*1. Differential temperature control: The valve operates to maintain the temperature difference dTHM (between TH11 and
TH13) in the specified range on a minute basis.
OFF OFF ON OFF
Operation mode Cooling only Cooling main Heating only Heating main Defrost Stopped
LEV1 2000 Liquid level
control
*1
Differential
temperature
control
*2
*1. Liquid level control: The LEV maintains the liquid level as calculated from the HIC inlet subcool temperature (TH13 and
TH14) in the specified range on a minute basis.
*2. Differential temperature control: The valve operates to maintain the temperature difference dTHM (between TH11 and
TH13) in the specified range on a minute basis.
110 110
*3
*3. The pulse may rise above 110 due to pressure rise on the liquid side.
2000 1200
LEV3
Superheat
control
*4
*4. Superheat control: The LEV maintains the superheat amount as calculated from the bypass inlet and outlet temperatures
(TH12 and TH15) in the specified range on a minute basis.
Differential
temperature
control
*5
*5. Differential temperature control: The valve operates to maintain the temperature difference dTHM (between outdoor unit
condensation temperature and TH14) in the specified range on a minute basis.
Differential
temperature
control
*5
2000 60