56 KOMAC00607-09EN
!
CAUTION
If all power to the unit is turned off, the compressor heaters will become
inoperable. Once power is resumed to the unit, the compressor and oil separator
heaters must be energized a minimum of 12 hours before attempting to start the
unit.
Failure to do so can damage the compressors due to excessive accumulation of
liquid in the compressor.
Start-up After Temporary Shutdown
1. Insure that the compressor and oil separator heaters have been energized for at least
12 hours prior to starting the unit.
2. Start the chilled water pump.
3. With System switch Q0 in the "on" position, move pumpdown switches Q1 and Q2
to the "auto" position.
4. Observe the unit operation until the system has stabilized.
Extended (Seasonal) Shutdown
1. Move the Q1 and Q2 (and Q3) switches to the manual pumpdown position.
2. After the compressors have pumped down, turn off the chilled water pump.
3. Turn off all power to the unit and to the chilled water pump.
4. If fluid is left in the evaporator, confirm that the evaporator heaters are operational.
5. Move the emergency stop switch S1 to the "off" position.
6. Close the compressor discharge valve and the optional compressor suction valve (if
so equipped) as well as the liquid line shutoff valves.
7. Tag all opened compressor disconnect switches to warn against start-up before
opening the compressor suction valve and liquid line shutoff valves.
8. If glycol is not
used in the system, drain all water from the unit evaporator and
chilled water piping if the unit is to be shutdown during winter and temperatures
below -20°F can be expected. The evaporator is equipped with heaters to help
protect it down to -20°F. Chilled water piping must be protected with field-installed
protection. Do not leave the vessels or piping open to the atmosphere over the
shutdown period.
9. Do not
apply power to the evaporator heaters if the system is drained of fluids as
this can cause the heaters to burn out.
Start-up After Extended (Seasonal) Shutdown
1. With all electrical disconnects locked and tagged out, check all screw or lug-type
electrical connections to be sure they are tight for good electrical contact.
!
DANGER
LOCK AND TAG OUT ALL POWER SOURCES WHEN CHECKING
CONNECTIONS. ELECTRICAL SHOCK WILL CAUSE SEVERE PERSONAL
INJURY OR DEATH.
2. Check the voltage of the unit power supply and see that it is within the ±10%
tolerance that is allowed. Voltage unbalance between phases must be within ±3%.
3. See that all auxiliary control equipment is operative and that an adequate cooling
load is available for start-up.
4. Check all compressor flange connections for tightness to avoid refrigerant loss.
Always replace valve seal caps.
5. Make sure system switch Q0 is in the "Stop" position and pumpdown switches Q1
and Q2 are set to "Pumpdown and Stop", throw the main power and control
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