Trane CVHE Troubleshooting Manual page 109

0
1
1
1
1
1
1
Pumps:
Condenser pump control shall be as in Normal Cooling.
Chilled Water pump control shall be as in Normal Cooling.
Upon termination of Ice Building based on evaporator entering water temperature, either the
UCM or Unit must provide a contact closure that can be used to turn off the pump system. This
requirement shall be satisfied as follows:
During the ICE-BUILDING COMPLETE mode the CHWP relay shall be de-energized
immediately upon entering "Ice Building Complete" (following the "post lubrication" mode) as if
the chiller had been manually put to STOP. Assuming the chiller is still in the AUTO mode when
the External Ice Contacts are opened, the CHWP relay shall be re-energized.
Ice Building Relay:
The ice building relay will be held on as long as there is a valid ice building command and the Ice
building complete mode has never occurred. If ice building is interrupted by a diagnostic or some
type of stop command, the relay will be held on. This is because clearing of the diagnostic or re-
entering the auto condition will allow ice building to resume. Said another way, the ice building
relay is on whenever there is a Ice Building command (External or Remote Communicated
(Tracer)) but we are not in the Ice Building Complete mode.
CVHE-SB-32A
Ice (Short) >
Normal (0pen) >
Ice (Short) >
Ice (Short) <
Ice (Short) >
Normal (Open) >
Ice (Short) >
Stop
Auto
Ice-building, Run Full Load.
Ice-completed, Ice-building
Terminated Because the
Ice Completion Setpt was
Met.
Ice Completed, Cannot
Restart Ice-building
Because the Ext Ice Input
was not Cycled Out and
Back Into "Ice Building".
Auto, Normal Chiller
Operation Based and
Chilled Water Setpoint.
Ice-building.
104