YORK INTERNATIONAL
6
FIG. 9 – CONDENSER WATER FLOW INTERLOCK
If desired, a condenser water flow interlock can be ap-
plied. Flow switch – McDonnel type FS8W, max. 150
psi (YORK Part No. 024-15793) available at additional
cost. If condenser water flow switch is not used, a
jumper must be installed between terminals 1 and 11 .
When condenser water is flowing, the flow switch con-
tact will close. Opening of the condenser water flow
switch contacts for 2 continuous seconds will cause unit
shutdown. The Flow Switch Status is checked 30 sec-
onds into “System Run” and continuously thereafter.
The OptiView Control Center will display the following
message: “CYCLING SHUTDOWN – AUTO RE-
START” and “CONDENSER FLOW SWITCH
OPEN”.
FIG. 7 – REMOTE/LOCAL CYCLING DEVICES
FIG. 7 – REMOTE/LOCAL CYCLING DEVICES
The closure of an automatic reset device across this
input will permit the unit to operate in all operating
modes. Conversely, an opening of the device contacts
will inhibit the unit from operating; the OptiView Con-
trol Center will then display the following messages:
“CYCLING SHUTDOWN – AUTO RESTART” and
“SYSTEM CYCLING – CONTACTS OPEN”.
The OptiView Control Center con-
tains a seven day time clock to select
daily schedule Start/Stop times (Sun-
day through Saturday including one
or more holidays in week) up to one
full week at a time. So automatic start
and stop of the unit on a daily basis,
at predetermined times, can be pro-
grammed as a standard feature; an ad-
ditional program timer is not required
for this function.
LD06828
FIG. 8 – MULTI-UNIT SEQUENCE
FIG. 9 – CONDENSER WATER FLOW INTERLOCK
LD06825
LD06827
FIG. 8 – MULTI-UNIT SEQUENCE
For multiple chiller installation application, Multi-Unit
Sequence contacts are available to start and stop each
unit. The maintained closure of a device contacts across
terminals
1
and
9
will permit the unit to operate in
all the operating modes with the “compressor” switch
in the “RUN” (
l
) position. Conversely, an opening of
the device contacts will inhibit the unit from operating;
the OptiView Control Center will then display the fol-
lowing message: “CYCLING SHUTDOWN – AUTO
RESTART” and “MULTIUNIT CYCLING – CON-
TACTS OPEN”. An accessory sequence control kit
for two, three or four units is available from YORK –
See Fig. 10 for Two Unit Sequence Control kit.