Trane CVGF-SVU02B-E4 Operation And Maintenance Manual page 74

Unit Startup
Unit Start-Up Procedures
Daily Unit Start-Up
1. Verify the chilled water pump
and condenser water pump
starter are in "ON" or
"AUTO."
2. Verify the cooling tower is in
"ON" or "AUTO."
3. Check the oil tank oil level; the
level must be visible in or
above the lower sight glass.
Also be sure to check the oil tank
temperature; normal oil tank
temperature before start-up is
140°F to 145°F (60° to 63°C).
Note: The oil heater is energized
during the compressor off cycle.
During unit operation, the oil
tank heater is de-energized.
74
Unit
Startup
4. Check the chilled water
setpoint and readjust it, if
necessary, in the Chiller
Settings menu.
5. Check the current limit
setpoint and readjust it, if
necessary, in the chiller
settings menu.
6. Press <AUTO>.
Next, the CH530 checks the
leaving evaporator water
temperature and compares it to
the chilled water setpoint. If the
difference between these values
is less than the start differential
setpoint, cooling is not needed.
If the CH530 determines that the
difference between the
evaporator leaving water
temperature and chilled water
setpoint exceeds the start
differential setpoint, the unit
enters the initiate in the start
mode, the oil pump and the
condenser water pump are
started. If condenser water flow
is not proven (flow switch 5S2
does not close) within 4 minutes
15 seconds, the unit is locked out
on a MMR Diagnostic.
Oil pressure must be verified
within 3 minutes or a MMR
diagnostic is generated.
When less than 5 seconds
remain on the restart inhibit, the
pre-start test is conducted on Y-
Delta starters. If faults are
detected, the unit's compressor
will not start, and a MMR
Diagnostic will be generated.
Note: Whenever the CH530
detects a MMR diagnostic
condition during start-up, unit
operation is locked out, and
manual reset is required before
the start-up sequence can begin
again. If the fault condition has
not cleared, CH530 will not
permit restart.
When the cooling requirement is
satisfied, the CH530 originates a
"Shutting down" signal. The
inlet guide vanes are driven
closed for 50 seconds, and the
unit enters a 1 minute post-lube
period. The compressor motor
and condenser water pump
starter are de-energized
immediately, but the oil pump
continues to run during this 3
minute interval; the evaporator
pump will continue to run. Once
the post-lube cycle is done, the
unit returns to auto mode.
CVGF-SVU02B-E4