Controlling Bc Controller; Control Of Svm1 Snd Svmb; Control Of Lev; Control Of Svm2, And Svm2B - Mitsubishi Electric PURY-(E)P200 Service Handbook

[ VII Control ]

[3] Controlling BC Controller

1. Control of SV A, SV
SV A, SV B, and SV
SV A
Port SV B
SV C

2. Control of SVM1 snd SVMb

SVM turns on or off depending on the operation mode.
Operation
Cooling only
mode
SVM1,1b ON
*1. Pressure differential control: The detected differential pressure (PS1 and P3) is controlle every minute so
as to be within a certain range.

3. Control of LEV

LEV opening (sj) is controlled as follows depending on the operation mode.
Operation mode
LEV1
LEV2
G,GA
(only GA,HA type)
HA
type
LEV3
GB,HB
LEV3
type
*1. Liquid level control: The liquid level detected by the liquid inlet temperature (TH11 sensor) is controlled so as to be within
a certain range.
*2. Pressure differential control: The detected differential pressure (PS1 and P3) is controlle every minute so as to be within
a certain range.
*3. Can be 110 or more due to pressure rise on the liquid side (PS1).
*4. Superheat control: The amound of superheat that is calculated on the bypass inlet and outlet temperature (G, GA, H,
HA,:TH12,TH15, GB, HB: TH12, TH15) is controlled every minute so as to be within a certain range.

4. Control of SVM2, and SVM2b

Operation
Cooling only
mode
SVM2,2b
*1. Pressure differential control: The detected differential pressure (PS1 and P3) is controlled every minute so as to be with-
in a certain range.
HWE07130
B, and SV C
C turn on or off depending on the operation mode of the branch.
Cooling Heating
ON
OFF
ON
Cooling main Heating only
Pressure dif-
ferential con-
*1
trol
Cooling only
2000
Liquid level
control
ferential
control
Superheat
*4
control
Superheat
*4
control
Cooling main
OFF OFF
Mode
Stopped
OFF OFF
ON OFF
OFF OFF
Heating main
OFF OFF
Cooling
Heating only
main
110
*1
dif-
Pressure dif-
*2
ferential con-
*2
trol
Superheat
60
*4
control
Heating only Heating main
Pressure differ- Pressure differ-
*1
ential control ential control
- 136 -
Defrost
OFF
OFF
OFF
Defrost Stopped
ON OFF
Heating
Defrost
main
*3
110 2000
Pressure dif-
G:1000
ferential con-
GA,HA:2000
*2
trol
60 60
Defrost
OFF
*1
Stopped
1200
60
60
Stopped
OFF
GB