Technical data

MUST be suppressed using a standard R/C
suppressor to avoid electrical noise which
could cause a malfunction or damage to the
unit.
To avoid the possibility of motor failure due to
excessive start cycles, the unit should not
normally be cycled using the remote
connections. Cycling of the unit based on
cooling demand is accomplished
automatically by the control centre. In
addition, the control centre has a
programmable time clock function as a
standard feature with holiday capability. This
offers one preset automatic Start-Stop per
day on a seven day calendar basis with the
ability to program a single additional holiday
start and stop time up to a week in advance.
4.21.1 Remote Start / Stop (R/STT - TB2: terminals 1 & 7)
(R/STP - TB2: terminals 1 & 8)
With the control centre is in the "REMOTE" operating
mode, the "COMPRESSOR' switch is in the "run"
position and the Remote Ready to Start Contacts
indicate the unit is ready to start, holding contacts open
across the Remote Stop Connections and closing
contacts across the Remote Start Connections will start
the unit. A subsequent closure of the Remote Stop
Contacts causes the unit to shutdown.
If the Remote Start and Remote Stop connections are to
be used at a remote control station rather than by an
EMS/ BAS it is recommended that a change over
contact is used between the terminals.
When the unit is operated in remote mode using the
Remote Start-Stop connections, an EMERGENCY
STOP by an operator or others will STOP the
compressor from the control centre and prevent the unit
from restarting. However, the operator cannot locally
start the compressor using the COMPRESSOR start
switch, when the control centre is in the "REMOTE"
operating mode
4.21.2 Remote / Local Cycling
(R/LC - TB2: terminals 1 & 13)
The closure of an automatic reset device across these
terminals will permit the unit to operate in all operating
modes. Conversely, an opening of the device contacts
will inhibit the unit from operating. (These connections
may also be used to install a condenser water flow
switch to give protection against loss of cooling water
through the condenser).
4.21.3 Chilled Water Flow Interlock
(CPWI - terminals 1 & 12)
A suitable flow switch which closes on presence of flow
must be installed between these contacts, to give
adequate protection against loss of chilled liquid flow.
The flow switch contacts should be rated for 5 mA at
115 Vac.
035L02381-GB0 4-9
3 50Hz
380/
4
00
V
U
PE
PE
VW
L3L2L1
-QSDF
Solid State
Starter
Fused Disconnect
Switch
Figure 4.7 Solid State Starter Connections