Operating instructions

10
OPERATION
COOLING
1. Select STOP on the REMOTE-STOP-RUN
switch to stop heating operation. (If currently
operating in the heating mode.)
2. Push COOLING on the control panel to select
cooling mode. (Automatic selection on
chillers.)
3. Select RUN on the REMOTE-STOP-RUN
switch to start cooling operation. (Cooling
operation will commence 30 minutes after
heating operation is stopped.)
REMOTE CONTROL
Select REMOTE on the REMOTE-STOP-
RUN switch to allow external controls to start,
stop and select the chiller-heater operating
mode. (When REMOTE is selected the control
panel is disabled.)
SAFETY CONTROLS
Safety/limit controls monitor critical operating
conditions in the chiller or chiller-heater and
shutdown the unit when abnormal conditions
occur. An Error Code that designates the cause
of the shutdown, shown in Table 2, is displayed
on the control panel. When the abnormal
condition has cleared, push the Alarm Reset to
restart cooling or heating operation. If the chiller
or chiller-heater does not restart, contact your
Authorized Yazaki Service Provider.
HEATING
1. Select STOP on the REMOTE-STOP-RUN
switch to stop cooling operation. (If currently
operating in the cooling mode.)
2. Push HEATING on the control panel to
select heating mode.
3. Select RUN on the REMOTE-STOP-RUN
switch to start heating operation. (Heating
operation will commence 30 minutes after
cooling operation is stopped.)
WINTER SHUTDOWN
If a chiller-heater is only used in the cooling
mode and shutdown for the winter, operate the
chiller-heater for 30 minutes in the heating mode
to dilute the working fluids. Proceed with
winterizing the cooling tower and cooling water
circuit.
PRECAUTIONS
1. Ensure that all AUTO-OFF-MANUAL
switches for external pumps and the cooling
tower fan are set in the AUTO position
during normal operation. (The chiller or
chiller-heater is designed to automatically
control the chilled/hot water pump, cooling
water pump, heat medium pump and/or heat
medium bypass valve.)
2. At the beginning of the cooling season clean
and refill the cooling tower with fresh water.
3. During the heating season the cooling tower
and cooling water circuit should be drained
to avoid freezing and scaling in the absorber
and condenser of the chiller/chiller-heater.
4. When two or more absorption chiller-heater
modules are installed in parallel, set all units
for the same operating mode.