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[ VII Control ]
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HWE09080 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 and 1b
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, and 2b
Mode
Cooling Heating Stopped
Port
SV A ON OFF OFF
SV B OFF ON OFF
SV C ON OFF OFF
Operation mode Cooling only Cooling main Heating only Heating main Stopped
SVM1,1b ON
Pressure differen-
tial control
*1
*1. Pressure differential control: The detected differential pressure (PS1 and PS3) is controlle every minute so as to be within
a certain range.
OFF OFF OFF
Operation mode Cooling only Cooling main Heating only Heating main Stopped
G,GA
type
LEV1
2000
Liquid level
control
*1
differ-
ential 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 PS3) 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).
1200
LEV2
(only GA type)
LEV3
Superheat con-
trol
*4
*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.
Pressure differ-
ential control
*2
Pressure differ-
ential control
*2
60
GB,HB
type
LEV3
Superheat con-
trol
*4
Superheat con-
trol
*4
60 60 60
Operation mode Cooling only Cooling main Heating only Heating main Stopped
SVM2,2b OFF OFF
Pressure differen-
tial control
*1
*1. Pressure differential control: The detected differential pressure (PS1 and PS3) is controlled every minute so as to be within
a certain range.
Pressure differen-
tial control
*1
OFF