Unit Shutdown; Normal Shutdown To Stopped; Seasonal Unit Shutdown - Trane CGAM Installation & Operation Manual

Unit Shutdown

Normal Shutdown to Stopped

Figure 104 shows transition from Running through a
Normal (friendly) Shutdown. Dashed lines on top attempt
to show final mode if you enter stop via various inputs.
Figure 104. Normal shutdown to stopped or run inhibitl
Local Stop
Normal Shutdown Diagnostic*, Latched
Normal Shutdown Diagnostic*, Non-Latched
BAS Stop
External Auto-Stop
Local Schedule Stop
Shutting Down
Running
(Operational Pumpdown)
Waiting for EXV to Close
(0 to 10 Seconds)
Close EXV
De-Energize all Non-
Pumpdown
Compressors **

Seasonal Unit Shutdown

1. Perform normal unit stop sequence using <Stop> key.
Note: Starter disconnect switch must remain closed to
provide power to compressor oil sump heaters.
2. Verify that the chilled water and pumps are cycled off.
If desired, open the disconnect switches to the pumps.
3. Verify that the compressor oil sump heaters are
installed tightly around the compressor. Energize and
verify heaters are operational using a temperature
probe. See Table 71, p.
Table 71. Compressor oil sump heater summary
Heater Group Heater Description
Compr 1A, Ckt 1
Compr 1B, Ckt 1
Compr 1C, Ckt 1
Compressor Oil Sump
Compr 2A, Ckt 2
Compr 2B, Ckt 2
Compr 2C, Ckt 2
(a) Not all heaters are present on all unit configurations. See schematics
and component locations in
CG-SVX17E-EN
Shutting Down
(Operational Pumpdown)
Waiting for Saturated Suction
Temperature to fall to 0 Degrees F
(Less than 30 Seconds)
Confirm Pumpdown
Termination. See Note***
* Normal Shutdown Diagnostic:
- Chiller Level Diagnostic
- Circuit Level Diagnostic on only running circuit
- Compressor Level Diagnostic on only running compressor
** Pumpdown Compressor is:
- One compressor on each circuit running during Operational Pumpdown
*** If normal pumpdown termination does not occur within the Pumpdown Timeout
129.
(a)
Heater
Designation(s)
3M1E1
3M2E1
3M3E1
4M1E1
4M2E1
4M3E1
section"Unit Wiring," p. 151.
Shutting Down
(Evaporator Water
Pump Off Delay)
Time out Evap Pump Off Delay
(adj 0-30 minutes)
De-Energize Pumpdown
Compressors
De-Energize All Fans
4. Verify that the freeze protection heaters are
operational. See Table 72, p.
thermostat and verify current flow. See section
Wiring, " p. 151 for component locations.
NOTICE:
Equipment Damage!
If the chiller evaporator or evaporator water piping is
drained of water, the evaporator immersion heater
must be de-energized. Failure to de-energize the heater
will cause it to burn out.
Stopped
or
Run Inhibit
De-Energize Evaporator
Water Pump
130. Install jumper across
"Unit
129