Johnson Controls YEWS Series, Installation, Operation And Maintanance Instructions

Page: 38 / 88

(6) Parameter Setting Interface-6
Press F1 to return to the parameter setting interface-3
Press F3 to return to the previous setting interface
Press F4 to enter into the next parameter setting interface
COOL SETTING
RETU
HOLD LOAD D.P. 1030KPa
UNLOAD D.P. 1060KPa
HIGH D.P.SHUTDOWN 1090KPa
UNLOAD CURR. 95 %
DELTA T 3.5
℃
LISU TEMP 70.0
℃
MINIMUM LOAD 15 %
BACK
NEXT
Setting scope and default value of the parameter:
HOLD LOAD D.P: 100
～
1300KPa Defoult:1030KPa
UNLOAD D.P: 100
～
1300KPa Defoult:1060KPa
HIGH D.P.SHUTDOWN: 100
～
1350KPa Defoult:1090KPa
UNLOAD CURR: 10
～
98 % Defoult:95%
DELTA T: 2.0
～
6.0
℃
Defoult:3.5
℃
LISV TEMP: 50.0
～
80.0
℃
Default: 70.0
℃
MINIMUM LOAD: 15~75% Default: 15%
If you select the different MODE,the setting of D.P is different.
If you want to know the exact parametere,please see 5.5
Parameter setting instructions:
HOLD LOAD D.P: If the discharge pressure
≥
HOLD
LOAD D.P setpoint, the compressor will stop loading .
(Default value is 1030 kPa under AC/ITS mode, and
1581kPa under HP mode); If the discharge pressure
≤
(HOLD LOAD D.P-50 kPa), the unit will turn back to
normal capacity control logic.
UNLOAD D.P.: If the discharge pressure
≥
UNLOAD
D.P setpont (Default value is 1060 kPa under AC/ITS
mode, and 1700kPa under HP mode), the compressor will
unload rapidly.If the discharge pressure
≤
(UNLOAD
D.P.-100 kPa) , the unit will turn back to normal capacity
control logic.
HIGH D.P.SHUTDOWN: If the discharge pressure
≥
HIGH D.P.SHUTDOWN setpont (Default value is 1090
kPa under AC/ITS mode, and 1790kPa under HP mode),
the compressor will stop running .
UNLOAD CURR:
OCC- Percentage of the compressor running amps to
MLA(maximum load amps)
MLA-Maximum Load Amps, corresponding with the
maximum compressor input power.
DELTA T: The difference between leaving evaporator
fluid temperature and evaporator refrigerant temperature.
Relate to liquid line bypass valve controlling; refer to the
instructions of control system.
The control method of units in ITS/HP mode is the same
as those in AC mode, but the setpoints are different with
different working mode.
(7) Parameter Setting Interface-7
Press F1 to return to the parameter setting interface-3
Press F2 to modify the signs of parameter set
Press F4 to enter into the next parameter set interface
Hold
Medium speed
Compulsory
Unload
Compressor current
（
OCC-5%
）
*MLA
Compressor current
≥
（
OCC-4%
）
*MLA
Compressor current
≥
（
OCC-3%
）
*MLA
Compressor current
≥
MLA
，
delay 5s
≥
shut down
ITS SETTING
LEL TEMP SET -5.6
℃
LEL TEMP CR 1.0
℃
CR BUFFER 2.5
℃
LOW LELT -10.0
℃
HIGH LCLT 43.0
℃
L E.P UNLOAD 175KPa
L E.P SHUTDOWN 165KPa
RETU
+/-
NEXT
LEL TEMP SET: -8.0
℃～
+5.0
℃
Default: -5.6
℃
LEL TEMP CR: 0.5
℃～
2.0
℃
Default: 1.0
℃
CR BUFFER: 1.0
–
2.5
℃
Default: 2.5
℃
LOW LELT: -15.0
℃～
+5.0
℃
Default: -10.0
℃
HIGH LCLT: 30.0
℃～
60.0
℃
Default: 43.0
℃
L E.P UNLOAD: 80
～
300kPa Default: 175kPa .
L E.P SHUTDOWN: 80
～
300kPa Default: 165kPa
YEWS-E Water Cooling Screw Chiller/Heat Pump
33