Controlling Bc Controller - Mitsubishi Electric PURY-P72 Service Handbook
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Also See for PURY-P72:
- Service handbook (412 pages) ,
- Service handbook (387 pages) ,
- Service handbook (404 pages)
Table of Contents
[ VII Control ]
[3] Controlling BC Controller
1. Control of SV A, SV
B, and SV
SV
A, SV
B, and SV
SV A
Port
SV B
SV C
2. Control of SVM1, SVM1b
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 PS3) 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 PS3) 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,HA:TH12,TH15, GB, HB: TH12, TH15) is controlled every minute so as to be within a certain range.
4. Control of SVM2, SVM2b
Operation
Cooling only
mode
SVM2,2b
OFF
*1. Pressure differential control: The detected differential pressure (PS1 and PS3) is controlled every minute so as to be
within a certain range.
HWE1116D
C
C turn on or off depending on the operation mode of the branch.
Cooling
Heating
ON
OFF
OFF
ON
ON
OFF
Cooling main
Heating only
Pressure dif-
ferential con-
OFF
*1
trol
Cooling
Cooling only
main
2000
Liquid level
*1
control
ferential
*2
control
Superheat
*4
control
Superheat
Superheat
*4
control
control
Cooling main
Heating only
Pressure differ-
OFF
ential control
- 158 -
Mode
Stopped
Defrost
OFF
OFF
OFF
OFF
OFF
OFF
Heating main
Defrost
OFF
ON
Heating
Heating only
main
*3
110
110
dif-
Pressure dif-
Pressure dif-
ferential con-
ferential con-
*2
*2
trol
trol
60
60
*4
Heating main
Pressure differ-
*1
*1
ential control
Stopped
OFF
Defrost
Stopped
2000
1200
G:1000
60
GA,HA:2000
60
60
Defrost
Stopped
OFF
OFF
GB
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