Seasonal Unit Start-Up; Daily Unit Shut-Down - Trane CVHE Installation, Operation And Maintenance Manual

Start-up and Shut-down
unit enters the initiate Start Mode and the oil refrigerant
pump and the condenser water pump are started. If flow is
not initially established within 4 minutes 15 seconds of the
condenser pump relay energization, an automatically
resetting diagnostic "Condenser Water Flow Overdue"
shall be generated which terminates the prestart mode
and de-energizes the condenser water pump relay. This
diagnostic is automatically reset if flow is established at
any later time.
Note: This diagnostic does not automatically reset if
Tracer AdaptiView is in control of the condenser
pump through its condenser pump relay, since it is
commanded off at the time of the diagnostic. It may
reset and allow normal chiller operation if the
pump was controlled from some external source.
When less than 5 seconds remain on the restart inhibit, the
pre-start starter test is conducted on wye-delta starters. If
faults are detected, the unit's compressor will not start, and
a diagnostic will be generated. If the compressor motor
starts and accelerates successfully, Running appears on
the display. If the purge is set to AUTO, the purge will start
running and will run as long as the chiller is running.
Note: If a manual reset diagnostic condition is detected
during start-up, unit operation will be locked out,
and a manual reset is required before the start-up
sequence can begin again. If the fault condition has
not cleared, the control panel will not permit
restart.
When the cooling requirement is satisfied, the control
panel originates a Shutting down signal. The inlet guide
vanes are driven closed for 50 seconds, the compressor
stops, and the unit enters a 3-minute post-lube period. The
evaporator pump may continue to run for the amount of
time set using Tracer AdaptiView.
Once the post-lube cycle is done, the unit returns to auto
mode.

Seasonal Unit Start-up

1. Close all drain valves, and reinstall the drain plugs in
the evaporator and condenser headers.
2. Service the auxiliary equipment according to the start-
up and maintenance instructions provided by the
respective equipment manufacturers.
3. Fill and vent the cooling tower, if used, as well as the
condenser and piping. At this point, all air must be
removed from the system (including each pass). Then
close the vents in the condenser waterboxes.
4. Open all of the valves in the evaporator chilled water
circuit.
5. If the evaporator was previously drained, fill and vent
the evaporator and chilled water circuit. When all air is
removed from the system (including each pass), close
the vent valves in the evaporator waterboxes.
6. Lubricate the external vane control linkage as needed.
68
7. Check the adjustment and operation of each safety and
operating control.
8. Close all disconnect switches.
9. Perform instructions listed in
p. 67.

Daily Unit Shut-down

Note: Also refer to Figure 41, p.
1. Press STOP .
2. After compressor and water pumps shut-down, the
operator may turn Pump Contactors to OFF or open
pump disconnects.
Seasonal Unit Shut-down
Important: Control power disconnect switch must
remain closed to allow oil sump heater
operation. Failure to do this will allow
refrigerant to condense in the oil pump.
1. Open all disconnect switches except the control power
disconnect switch.
2. Drain the condenser piping and cooling tower, if used.
Rinse with clean water.
3. Remove the drain and vent plugs from the condenser
headers to drain the condenser. Air dry bundle of
residual water.
4. Once the unit is secured for the season, the
maintenance procedures described
Table 20, p. 71 should be performed by qualified Trane
service technicians.
Note: During extended shut-down periods, be sure to
operate the purge unit for a two-hour period every
two weeks. This will prevent the accumulation of
air and noncondensables in the machine. To start
the purge, change the purge mode to ON in the unit
control "Settings Purge" menu. Remember to turn
the purge mode to "Adaptive" after the two-hour
run time.
"Daily Unit Start-up, "
63.
Table 19, p. 70 and
CVHE-SVX02H-EN