Sentry AutoVREL - Page 16

16 Sentry Equipment Corp
c. FACTORY SETTING – This is available for factory personnel only and requires a
password
2. Enter Standby mode by pressing the ESCAPE button. “STANDBY MODE” is displayed
on the LCD display. While in Standby mode the unit does not actively manage ow.
a. VREL Calibration sequence:
 From Standby mode, press the ENTER button to enter Set Up mode; “CAL VREL”
is displayed on the LCD display.
 To calibrate the VREL press ENTER again. A message prompts you to ensure the
sample inlet isolation valve is closed.
 Once veried, press ENTER again and the unit executes VREL calibration.
 Once calibration is complete, press ESCAPE once to go back to Standby mode.
 To resume normal operation press ESCAPE again.
b. Factory Setting
 This option is not available for users and is restricted to factory authorized
personnel.
 If you accidentally enter this menu option, press ESCAPE once to go back to
Standby mode and ESCAPE again to resume normal operation.
Alarms
Local alarm
Operation LED is not lit when ow is outside of preset control limits.
External Alarm
External alarm is triggered on 2 events:
1. VREL valve error: VREL valve either does not turn or turns continuously without
control of ow.
2. TSV error: Limit switch on TSV trips, indicating an over temperature condition.
Manual Operation
There are two methods of manual operation available: physical operation of the VREL
valve and manual operation through the AutoVREL controller.
Physical Operation of the VREL Valve
If the AutoVREL ow controller becomes unavailable for any reason (e.g., stops working or
is returned to the factory for calibration), the VREL valve can be operated manually.
1. Place the unit in Standby mode or disconnect power.
2. Remove the two (2) Allen screws on the face of the control unit.
3. Pull o the control unit and disconnect the cables.
4. Remove the cotter pin from the VREL gear and then remove the gear.
5. Mount a VREL handle on the shaft and tighten the set screw.
6. Rotate the VREL valve until desired ow rate is achieved.