035-19569-101 (0109)
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6.7 Stopping the System
The graphic control centre (OptiView) can be programmed
to start and stop automatically (maximum, once each
day) whenever desired. To stop the chiller, proceed as
follows:
1. Push the compressor STOP/RESET(O) switch. The
compressor will stop automatically. The oil pump will
continue to run for shutdown period. The oil pump
will then stop automatically.
2. Stop the chilled water pump (if not wired into the
graphic control centre, in which case it will shut off
automatically simultaneously with the oil pump.) (The
actual water pump contact operation is dependent
upon the position of the microprocessor board jumper
J54.)
3. Open the switch to the cooling tower fan motors, if
used.
4. The compressor sump oil heater (thermostatically
controlled) is energised when the unit is stopped.
6.8 Prolonged Shutdown
If the chiller is to be shut down for an extended period of
time (for example, over the winter season), the following
paragraphs detail the procedure to be followed.
1. Test all system joints for refrigerant leaks with a
leak detector. If any leaks are found, they should be
repaired before allowing the system to stand for a
long period of time.
During long idle periods, the tightness of the system
should be checked periodically.
2. If freezing temperatures are encountered while the
system is idle, carefully drain the water from the
cooling tower, condenser, condenser pump, and the
chilled water system, chilled water pump and coils.
Open the drains on the evaporator and condenser
liquid heads to assure complete drainage. (If a
Variable Speed Drive is fi tted, drain its water cooling
system. If a Solid State Starter is fi tted drain water
from starter cooling loop).
3. On the SETUP Screen, disable the clock. This
conserves the battery.
4. Open the main disconnect switches to the compressor
motor, condenser water pump and the chilled water
pump. Open the 115 V circuit to the control centre.
6.9 Start-up after Prolonged Shutdown
1. When putting the system into operation after
prolonged shutdown (during the winter), remove all oil
from the compressor. Install a new fi lter element and
charge the compressor with fresh oil. On the SETUP
Screen, enable the clock. Energise the 115 V circuit to
the control centre to energise the compressor sump
oil heater for at least 12 hours.
2. Operate the Oil Pump (press and release the
MANUAL OIL PUMP key) until steady oil pressure is
established. Then press and release the OIL PUMP
key to stop operation of the oil pump. If the water
systems were drained, fi ll the condenser water circuit
and chilled liquid circuit.
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