Johnson Controls YEWS Series, Installation, Operation And Maintanance Instructions

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SYS1 BYPASS CTRL.
：
If SYS1 BYPASS CTRL . is
set as
AUT
O, which should be controlled according to the
specific logic; while if SYS1 BYPASS CTRL . is set as
MANUAL , it should be operated in accordance with the
BYPASS1 or BYPASS1 .
(BYPASS just suit for the style before D1)
SYS2 BYPASS CTRL.
：
For system2,With the same
SYS1 BYPASS CTRL.
Single-system units, Settings of related to the system2
don
’
t use.
(4)Parameter Setting Interface-4
Press F1 to retur n t o th e paramete r settin g interface-1.
Press F2 to enter into the parameter setting interface of
AC mo de.
Press F3 to enter into the parameter setting interface of
ITS mode.
Press F4 to enter into the parameter setting interface of
HP mode.
LEL TEMP SET 7.0
℃
LEL TEMP CR 1.0
℃
CR BUFFER 2.5
℃
LOW LELT 2.0
℃
HIGH LCLT 43.0
℃
L E.P UNLOAD 175KPa
L E.P SHUTDOWN 165KPa
COOL SETTING
RETU
NEXT
MODE SETTING
COOL SETTING
ITS SETTING
HEAT(D1-HP/E-HP2) SETTING
RETU
NEXT
NEXT
NEXT
(5)Parameter Setting Interface-5
Press F1 to return to the parameter setting interface-3.
Press F4 to enter into the next parameter setting interface.
Setting scope and default value of the parameter
LEL TEMP SET: 4.0
℃
~15.0
℃
Default: 7.0
℃
LEL TEMP CR: 0.5
℃
~2.0
℃
Default: 1.0
℃
HIGH LCLT : 30.0
℃
~60.0
℃
Default: 43.0
℃
L E.P UNLOAD: 150~300kPa Default: 175kPa
L E.P SHUTDOWN: 150~300kPa Default: 165kPa
CR BUFFER
：
1.0
–
2.5
℃
Default: 2.5
℃
LOW LELT
：
1.0
–
7.0
℃
Default: 2.0
℃
Parameter setting instructions:
LEL TEMP SET: Set the desired leaving evaporator fluid
temperature, the default is 7.0
℃
LEL TEMP CR: Used to decide the desired fluid temp-
erature control range, the default is 1.0
℃
LOW LELT: If the leaving evaporator liquid temper-
ature
≤
LOW LELT setpoint, fault alarm will be
displayed and the compressor will be shut off, but the
water pump is still on runing. The Cycling Startup Logic
will be actived when the leaving chilled liquid
temperature
≥
(LOW LCLT se10.0
℃
).
HIGH LCLT
：
If the leaving condenser liquid temper-
ature
≥
HIGH LCLT setpoint, fault alarm will be
displayed and the compressor will be shut off, but the
water pump is still on runing. The Cycling Startup Logic
will be actived when the leaving cooling liquid
temperature
≤
(HIGH LCLT temperature setpoint -
10.0
℃
).
L E.P UNLOAD: If the evaporator pressure
≤
L E.P
UNLOAD setpoint, the compressor will unload
compulsively,the unit will come back to normal capacity
control when the evaporator pressure
≥
(L E.P UNLOAD
s25Kpa ). Default L E.P UNLOAD setpoint is
175kPa.
L E.P SHUTDOWN: If the evaporator pressure
≤
L E.P
SHUTDOWN setpoint, the unit will stop immediately.
Default L E.P SHUTDOWN setponit is 165 kPa.
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.
YEWS-E Water Cooling Screw Chiller/Heat Pump
HEAT(E-HP) SETTING
31