Johnson Controls York YIA Series Wiring Diagram page 6

N.O. CONTACTS (IN CONTROL
CENTER) RATED 2 AMPS INDUC-
TION AT 250VAC + 30VDC 5 AMPS
RESISTIVE AT 250VAC + 30VDC
FIG. 7 – ANTICIPATORY/ALARM CONTACTS
ANTICIPATORY/ALARM CONTACTS
These contacts will close whenever one or more of the
following WARNING conditions occurs. They will
remain closed as long as the condition is in effect. The
contacts will open only after the condition is no longer
present and the WARNING RESET key is pressed in
Operator (or higher) access level.
Low refrigerant temperature in evaporator, genera‑
tor high pressure, purge pump overloads open, faulty
strong solution temperature sensor, high steam supply
pressure, high hot water supply temperature, high steam
supply temperature, purge pump service recommended,
autopurge failure, purge tank pressure is greater than
100mmHg, purge pump OL contacts are in conflict,
purge transducer PT4 out of range, 8SOL failure, purge
failure, purge pump failure, refrigerant level switch con‑
flict, refrigerant from condenser RT9 or PT1 conflict.
FIG. 8 – REMOTE START-STOP CONTACTS
FROM ENERGY MANAGEMENT SYSTEM
REMOTE START AND STOP CONTACTS
FROM ENERGY MANAGEMENT SYSTEM
When the OptiView™ Control Center is in the "Digital",
"Analog" or "iSN" remote operating mode and the UNIT
switch is in the "RUN" (l) position, with the Remote
Stop Contacts open, and the Remote Mode Ready to
Start Contacts closed (Fig. 3), the unit will start via
a closure of the Re mote Start Contacts. A subsequent
6
closure of the Energy Management System Remote Stop
Contacts causes the chiller to shutdown. The OptiV‑
iew™ Control Center will display "REMOTE STOP"
because the Energy Management System Remote Stop
Contact has commanded the unit to shutdown.
It is recommended that maintained contacts be used for
LD04604
both START and STOP.
FIG. 9 – REMOTE/LOCAL CYCLING DEVICES
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™
Control Center will then display the following message
"CYCLING SHUTDOWN – AUTO RESTART".
LD06824
FORM 155.21-W2 (1209)
Even when the chiller is applied with
Remote Start‑Stop (when the Control
Center is in the "remote oper ating
mode"), an EMERGENCy StoP by
an operator or others can StoP the
unit from the optiView Control Center
and prevent the chiller from restart‑
ing. However, the operator cannot lo‑
cally start the unit using "UNIt" start
switch, when the control center is in
the "remote operating mode".
the optiView Control Center contains
a seven day time clock to select daily
schedule Start/Stop times (Sunday
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 pre‑
determined times, can be programmed
as a standard feature; an additional
program timer is not required for this
function.
JOHNSON CONTROLS
LD06825