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[ VII Control ]
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HWE0803A GB
[3] Controlling BC Controller
1. Control of SV A, SV B, and SV C
SV A, SV B, and SV C turn on or off depending on the operation mode of the branch.
2. Control of SVM1
SVM turns on or off depending on the operation mode.
3. Control of LEV
LEV opening (sj) is controlled as follows depending on the operation mode.
4. Control of SVM2
Mode
Cooling Heating Stopped Defrost
Port
SV A ON OFF OFF OFF
SV B OFF ON OFF OFF
SV C ON OFF OFF OFF
Operation
mode
Cooling only Cooling main Heating only Heating main Defrost Stopped
SVM1 ON
Pressure dif-
ferential con-
trol
*1
*1. Pressure differential control: The detected differential pressure (PS1 and P3) is controlle every minute so
as to be within a certain range.
OFF OFF ON OFF
Operation mode Cooling only
Cooling
main
Heating only
Heating
main
Defrost Stopped
G,GA
type
LEV1
2000
Liquid level
control
*1
dif-
ferential
control
*2
*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.
110 110
*3
*3. Can be 110 or more due to pressure rise on the liquid side (PS1).
2000 1200
LEV2
(only GA type)
LEV3
Superheat
control
*4
*4. Superheat control: The amound of superheat that is calculated on the bypass inlet and outlet temperature (G, GA,
H:TH12,TH15, GB, HB: TH12, TH15) is controlled every minute so as to be within a certain range.
Pressure dif-
ferential con-
trol
*2
Pressure dif-
ferential con-
trol
*2
G:1000
GA:2000
60
GB,HB
type
LEV3
Superheat
control
*4
Superheat
control
*4
60 60 60 60
Operation
mode
Cooling only Cooling main Heating only Heating main Defrost Stopped
SVM2 OFF OFF
Pressure differ-
ential control
*1
*1. Pressure differential control: The detected differential pressure (PS1 and P3) is controlled every minute so as to be with-
in a certain range.
Pressure differ-
ential control
*1
OFF OFF