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144 RTAC-SVX01F-EN
Unit Start-Up Procedures
Daily Unit Start-Up
The time line for sequence of operation is shown at the end of this section and
depicts the nominal delays and sequences that a chiller would experience during a
typical operational cycle. The time line begins with a power up of the main power to
the chiller. The sequence assumes a 2 circuit, 2 compressor air-cooled RTAC chiller
with no diagnostics or malfunctioning components. External events such as the oper
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ator placing the chiller in Auto or Stop, chilled water flow through the evaporator, and
application of load to the chilled water loop causing loop water temperature increases
are depicted and the chillers responses to those events are shown, with appropriate
delays noted. The effects of diagnostics, and other external interlocks other than evap
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orator water flow proving, are not considered. The response of the EasyView Display
is also depicted on the time line.
NOTE: Unless the CH530 TechView and building automation system are controlling
the chilled water pump, the manual unit start sequence is as follows. Operator
actions are noted.
CAUTION
Compressor Damage!
Ensure that the compressor and oil separator heaters have been
operating for a minimum of 24 hours before starting. Failure to do so
may result in equipment damage.
General
If the pre-start checkout, has been completed, the unit is ready to start.
1. Press the STOP key on the CH530.
2. As necessary, adjust the setpoint values in the CH530 menus using TechView.
3. Close the fused-disconnect switch for the chilled water pump. Energize the
pump(s) to start water circulation.
4. Check the service valves on the discharge line, suction line, oil line and liquid line
for each circuit. These valves must be open (backseated) before starting the com
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pressors.
CAUTION
Compressor Damage!
Catastrophic damage to the compressor will occur if the oil line shut off
valve or the isolation valves are left closed on unit start-up.
5. Press the AUTO key. If the chiller control calls for cooling and all safety interlocks
are closed, the unit will start. The compressor(s) will load and unload in response
to the leaving chilled water temperature.
6. Verify that the chilled water pump runs for at least one minute after the chiller is
commanded to stop (for normal chilled water systems).