Power Up Diagram; Ice Machine Control - Trane CVHE Installation, Operation And Maintenance Manual

Figure 41. Sequence of operation: normal shut-down to stopped and run inhibit

Power Up Diagram

Figure 38, p. 61 illustrates Tracer AdaptiView during a
power up of the main processor. This process takes from
30 to 50 seconds depending on the number of installed
Options. On all power ups, the software model always will
transition through the Stopped software state
independent of the last mode. If the last mode before
power down was Auto, the transition from Stopped to
Starting occurs, but it is not apparent to the user.

Ice Machine Control

The control panel provides a service level Enable or
Disable menu entry for the Ice Building feature when the
Ice Building option is installed. Ice Building can be entered
from Front Panel, or if hardware is specified the control
panel will accept either an isolated contact closure 1A19
Terminals J2-1 and J2-2 (Ground)) or a remote
communicated input (BAS) to initiate the ice building
mode where the unit runs fully loaded at all times. Ice
building will be terminated either by opening the contact
or based on entering evaporator fluid temperature. The
control panel will not permit the Ice Building mode to be
entered again until the unit is switched to the non-ice
building mode and back into the ice building mode. It is not
acceptable to reset the chilled water setpoint low to
achieve a fully loaded compressor. When entering ice
building, the compressor will be loaded at its maximum
rate and when leaving ice building the compressor will be
unloaded at its maximum rate. While loading and
CVHE-SVX02H-EN
unloading the compressor, all surge detection will be
ignored. While in the ice building mode, current limit
setpoints less than the maximum will be ignored. Ice
Building can be terminated by one of the following means:
• Front panel disable.
• Opening the external Ice. Contacts/ Remote
communicated input (BAS).
• Satisfying an evaporator entering fluid temperature
setpoint (default is 27°F [-2.8°C]).
• Surging for 7 minutes at full open IGV.
Start-up and Shut-down
63