Sequence of operations, Operation modes – Orion System PREHEAT-X User Manual
Page 11
SEQUENCE OF OPERATIONS
11
PREHEAT-X Technical Guide
Emergency Shutdown
The Emergency Shutdown input must always be used and wired
as a 24 VAC normally closed contact. If an Emergency Shutdown
occurs, and that contact opens:
•
All outputs will be immediately de-energized.
•
An alarm will be generated.
High Leaving Air Temperature Alarm
•
If the Leaving Air Temperature is above the LAT High
Temperature Alarm Limit for more than the Alarm
Delay all heating outputs will be de-energized
immediately.
•
An alarm will be generated.
•
A manual reset will be required.
Low Leaving Air Temperature Alarm
If the Leaving Air Temperature is below the LAT Low Temperature
Alarm Limit for more than 2 minutes, the heat will remain on but
an alarm will be generated.
Operation Modes