Bulletin 739
January 2021
Page 6 of 9
www.reliablesprinkler.com
Resetting the Model EX Single Interlock
System (Ref. Fig. 5)
1. Close the valve controlling water supply to the Model EX Valve
and close the air or nitrogen supply to the sprinkler system.
2. Close the pushrod chamber supply valve.
3. Open main drain valve and drain system. Close main drain
valve.
4. Open all drain valves and vents at low points throughout the
system, closing them when flow of water has stopped.
5. Open the Manual Emergency Station to relieve pressure in
the pushrod chamber of the Model EX Valve.
6. With the alarm line valve open, push in the plunger of ball drip
valve, forcing the ball from its seat, and drain the alarm line.
Close the alarm line valve.
7. With the Manual Emergency Station open, push in and rotate
the Model EX Valve external reset knob counterclockwise
(when facing the valve), until you hear a distinct noise
indicating that the clapper has reset. Note: The reset knob
can be rotated only while pressure in the pushrod chamber is
vented to atmospheric condition (0 psig) in step 5.
8. Inspect and replace any portion of the detection system and/
or sprinkler system subjected to re conditions.
9. Conrm that solenoid valves are de-energized and closed.
10. Open the air or nitrogen supply quick ll valve to restore
supervisory pressure in the sprinkler system and close
the pneumatic actuator. Allow the pressure to build to the
level specied in Table A, then set the pneumatic supply to
automatic operation.
11. Open the main drain approximately two turns.
12. Open the pushrod chamber supply valve.
13. Slightly open the main control valve until water can just be
heard running out the main drain.
14. Slowly close the main drain, directing water to the Manual
Emergency Release. Allow water to flow through the Manual
Emergency release to purge air from the pushrod chamber.
Note: Venting of air from the pushrod chamber is very
important to ensure proper system operation and avoid false
tripping of the Model EX Valve.
15. Upon seeing a solid flow of water from the drain tubing, close
the Manual Emergency Release valve. Allow pressure to build
below the Model EX Valve clapper.
16. Open the alarm line valve. If no leak occurs, the Model EX
Valve clapper is sealed.
17. Slowly open the main valve controlling water supply until fully
open and verify that it is properly monitored.
18. Verify that the pushrod chamber supply valve and alarm line
valve are open. The pushrod chamber supply valve must
remain open when the Model EX Valve has been reset to
maintain water pressure in the pushrod chamber.
19. Verify that the Manual Emergency Station is secured in the
OFF position with the appropriate nylon tie.
Model EX Type A Components
Figure 4
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