EWWD120~540MBYNN
Packaged water-cooled water chillers
4PW22684-1A
Installation manual
10
Example 2: Single ring system with separate pumps
Figure 2 shows the system configuration, field wiring and terminals
for field wiring of this example.
Purpose
Purpose of this system is to deliver a constant water flow at a
constant temperature to a particular load. One unit, slave 3 (S3), is
kept as a standby unit.
Setup
■
The system is controlled on leaving water temperature. It is
required to install the additional sensor R8T (EKCLWS) in the
mixed water outlet and to connect it to the PCB of the master
unit.
■
Pump 1, pump 2 and pump 3 keep running as long as the mas-
ter unit, slave 1 or slave 2 are ON. Pump 4 only starts running if
slave 3 is switched ON. After switching OFF the units, the pump
runs for a time indicated by the
setting.
■
Slave 3 (S3) is configured to operate when its remote start/stop
switch S6S (S3) is pushed by the operator.
■
Slave 1 (S1), slave 2 (S2) and the master unit (M) are switched
ON or OFF using the remote start/stop switch S6S (M) which is
connected to the master unit.
■
The setpoint can be switched from
to
using the dual setpoint selection switch S10S
which is connected to the master unit.
Parameter settings of the units
Usersettings menu:
Changeable inputs/outputs must be defined as follows:
Service setting menu:
Remark
Slave 3 can be configured to start up automatically if:
■
1 of the other units is in alarm or;
■
all other units are running on full capacity and the setpoint is not
reached yet.
To have your slave 3 unit act this way, set its mode to
. In this
case, S6S (S3) has no function.
Example 3: Double ring system with several pumps
Figure 3 shows the system configuration, field wiring and terminals
for field wiring of this example.
Purpose
Purpose of this system is to keep a buffer at a constant temperature
and to feed a load from this buffer. One unit, slave 3 (S3), is kept as a
standby unit.
Setup
■
The system is controlled on entering water temperature.
■
The pumps of the slave units only run when their compressor is
running (energy saving). the pump runs for a time indicated by
the
setting.
■
The pump of the master unit must run continuously so as to
sense the correct temperature.
■
Slave 3 (S3) is configured to operate when its remote start/stop
switch S6S (S3) is pushed by the operator.
■
Slave 1 (S1), slave 2 (S2) and the master unit (M) are switched
ON or OFF using the remote start/stop switch S6S (M) which is
connected to the master unit.
■
The setpoint can be switched from
to
using the dual setpoint selection switch S10S which is
connected to the master unit.
Parameter settings of the units
Usersettings menu:
Changeable inputs/outputs must be defined as follows:
Service setting menu:
Remark
Slave 3 can be configured to start up automatically if:
■
1 of the other units is in alarm or;
■
all other units are running on full capacity and the setpoint is not
reached yet.
To have your slave 3 unit act this way, set its mode to
. In this
case, S6S (S3) has no function.
NOTE
■
K*P can also be a 24 V DC or 230 V AC contactor.
■
The additional sensor R8T (EKCLWS) must be
connected directly to the PCB of the master unit.
Slave 3
Slave 2
Slave 1
Master
)
)
Slave 3
Slave 2
Slave 1
Master
Terminal 76-78
S10S DI1
Terminal 76-79
S6S DI2
Terminal 76-85
DI3
Terminal 76-86
DI4
Terminal 8T+8T–
R8T AI1
NOTE
K*P can also be a 24 V DC or 230 V AC contactor.
Slave 3
Slave 2
Slave 1
Master
)
)
Slave 3
Slave 2
Slave 1
Master
Terminal 76-78
S10S DI1
Terminal 76-79
S6S DI2
Terminal 76-85
DI3
Terminal 76-86
DI4
Terminal 8T+8T–
R8T AI1