Operating instructions
44
Become familiar with refrigeration chiller and related
equipment before operating the chiller.
1. Prepare the system for start-up, start and stop the
chiller, and place the system in a shutdown condition.
2. Maintain a log of operating conditions and document
any abnormal readings.
3. Inspect the equipment, make routine adjustments, and
perform a Control Test. Maintain the proper oil and
refrigerant levels.
4. Protect the system from damage during shutdown
periods.
5. Maintain the set point, time schedules, and other PIC
functions.
1. Start the water pumps, if they are not automatic.
2. On the ICVC default screen, press the LOCAL or
CCN softkey to start the system. If the chiller is in the
OCCUPIED mode and the start timers have expired,
the start sequence will begin. Follow the procedure
described in chapter 5.2 “Dry run to test start-up
sequence”.
After the compressor starts, the operator should monitor
the CVC display and observe the parameters for normal
operating conditions:
1. The oil reservoir temperature should be above 49°C
during shutdown, and above 52°C during compressor
operation.
2. The bearing oil temperature accessed on the 'COM-
PRESS' status screen should be 49 to 74°C. If the
bearing temperature reads more than 83°C with the
oil pump running, stop the chiller and determine the
cause of the high temperature. Do not restart the
chiller until corrected.
3. The oil level should be visible anywhere in one of the
two sight glasses. Foaming oil is acceptable as long as
the oil pressure and temperature are within limits.
4. The oil pressure should be between 124 to 207 kPa
differential, as seen on the ICVC default screen.
5. The moisture indicator sight glass on the refrigerant
motor cooling line should indicate refrigerant flow
and a dry condition.
6. The condenser pressure and temperature varies with
the chiller design conditions. Typically the temperature
range will be 15 to 41°C. The condenser entering water
temperature should be controlled below the specified
design return water temperature to save on compressor
kilowatt requirements.
7. Cooler pressure and temperature also will vary with
the design conditions. Typically the temperature range
will be 1 to 8°C.
8. The compressor may operate at full capacity for a short
time after the pulldown ramping has ended, even though
the building load is small. The pulldown rate can be
decreased to avoid a high demand charge for the short
period of high demand operation. Pulldown rate can
be based on power output or temperature rate. It is
accessed on the equipment service screen ‘RAMP DEM’.
IMPORTANT: Power equipment fault reports should be
checked on the ICVC first. On the 19XRV machines
additional information can be obtained by a direct check
on the starter device; please refer to the appendix starting
with chapter 8.
The occupancy schedule will start and stop the chiller
automatically once the time schedule is set up.
By pressing the STOP button for one second, the alarm
light will blink once to confirm that the button has been
pressed. Then, the compressor will follow the normal shut-
down sequence as described in chapter 6.2 of the Controls
manual. The chiller will not restart until the CCN or
LOCAL softkey is pressed. The chiller is now in the ‘Off
control’ mode.
NOTE: After the compressor has stopped the oil pump
must ensure post-lubrication. Other than for emergency
stops initiated by the control the compressor must not be
stopped by an action that also stops the oil pump. For
19XRV machines please refer to the appendix starting
with chapter 8. If the machine is stopped by an alarm, do
not restart it until the operating problem has been
diagnosed and corrected.
No special preparations should be necessary. Follow the
regular preliminary checks and starting procedures.
The refrigerant should be transferred into the pumpout
storage tank provided (refer to the transfer unit installation
manual, document order no. 19999, chapter “Pumpout and
refrigerant transfer procedures”) in order to reduce chiller
pressure and the possibility of leaks. Maintain a holding
charge of 2.27 to 4.5 kg of refrigerant or nitrogen to
prevent air from leaking into the chiller.
If freezing temperatures are likely to occur in the chiller
area, drain the chilled water, condenser water, and the
pumpout condenser water circuits to avoid freeze-up.
Keep the waterbox drains open.
Leave the oil charge in the chiller with the oil heater and
controls energized to maintain the minimum oil reservoir
temperature.