Trane R Series Installation Operation & Maintenance page 98

RTAC-SVX002A-EN
Unit Start-Up Procedures
Seasonal Unit Start-Up Procedure
1. Close all valves and reinstall the drain
plugs in the evaporator.
2. Service the auxiliary equipment ac-
cording to the start-up/maintenance
instructions provided by the respective
equipment manufacturers.
3. Close the vents in the evaporator
chilled water circuits.
4. Open all the valves in the evaporator
chilled water circuits.
5. Open all refrigerant valves to verify
they are in the open condition.
6. If the evaporator was previously
drained, vent and fill the evaporator and
chilled water circuit. When all air is re-
moved from the system (including each
pass), install the vent plugs in the evapo-
rator water boxes.
7. Check the adjustment and operation
of each safety and operating control.
8. Close all disconnect switches.
9. Refer to the sequence for daily unit
startup for the remainder of the seasonal
start-up.
System Restart After Extended Shut-
down
Follow the procedures below to restart
the unit after extended shutdown:
1. Verify that the liquid line service
valves, oil line, compressor discharge
service valves and suction service
valves are open (backseated).
CAUTION
Compressor Damage!
Catastrophic damage to the compres-
sor will occur if the oil line shut off
valve or the isolation valves are left
closed on unit start-up.
2. Check the oil separator oil level (see
Maintenance Procedures section).
3. Fill the evaporator water circuit. Vent
the system while it is being filled. Open
the vent on the top of the evaporator and
condenser while filling and close when
filling is completed.
CAUTION
Proper Water Treatment!
The use of untreated or improperly
treated water in the unit may result
in scaling, erosion, corrosion, algae
or slime. It is recommended that the
services of a qualified water treat-
ment specialist be engaged to deter-
mine what water treatment, if any, is
required. Trane assumes no respon-
sibility for equipment failures which
result from untreated or improperly
treated water, or saline or brackish
water.
4. Close the fused-disconnect switches
that provides power to the chilled water
pump.
5. Start the evaporator water pump and,
while water is circulating, inspect all pip-
ing for leakage. Make any necessary re-
pairs before starting the unit.
6. While the water is circulating, adjust
the water flows and check the water
pressure drops through the evaporator.
Refer to "Water System Flow Rates" and
"Water System Pressure Drop".
7. Adjust the flow switch on the evapora-
tor piping for proper operation.
8. Stop the water pump. The unit is now
ready for start-up as described in "Start-
Up Procedures".
Temporary Shutdown And Restart
To shut the unit down for a short time,
use the following procedure:
1. Press the STOP key on the CH530.
The compressors will continue to op-
erate and, after an unloading period
(which may be followed by pumpdown
cycle in outdoor ambients below 50oF),
will stop when the compressor contac-
tors de-energize.
2. CH530 pump control will turn off the
pump (after a minimum 1 min. delay)
when the STOP key is pressed and au-
tomatically restart the pump when the
unit starts normally.
3. The unit will start normally, provided
the following conditions exist:
– The CH530 receives a call for cooling
and the differential-to-start is above the
setpoint.
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