Table of Contents
[ 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
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
G,GA
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:TH12,
TH15, GB, HB:TH12, TH15) is controlled every minute so as to be within a certain range.
4. Control of SVM2
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.
HWE10020
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
Superheat
ferential
*4
control
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-
ferential con-
*2
*2
trol
Superheat
60
*4
control
Heating only
Heating main
Pressure differ-
Pressure differ-
*1
ential control
ential control
- 128 -
Defrost
OFF
OFF
OFF
Defrost
Stopped
ON
OFF
Heating
Defrost
main
*3
110
2000
Pressure dif-
G:2000(1000)
ferential con-
GA:2000
*2
trol
60
60
Defrost
OFF
*1
Stopped
1200
60
60
Stopped
OFF
GB
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