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 fire conditions.
9. Confirm that solenoid valves are de-energized and closed.
10. Open the air or nitrogen supply quick fill valve to restore
supervisory pressure in the sprinkler system and close
the pneumatic actuator. Allow the pressure to build to the
level specified 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.
Inspection and Testing
1. Water supply — Confirm that valves controlling water
supply to the EX Valve are opened fully and properly
monitored.
2. Alarm line — Confirm that the alarm line valve is open and
remains in this position.
3. Other trim valves — Confirm that the pushrod chamber
supply valve is open, as well as all pressure gauge valves.
The main drain valve, condensate drain valve, and alarm
test valve should be closed.
4. Ball drip valve — Push in on the plunger to be sure ball
check is off its seat. If no water appears, the Model EX
Valve water seat is tight. Inspect the bleed hole on the
underside of the pushrod chamber for leakage.
5. Supervisory pneumatic pressure — Inspect actuation
piping and system air (or nitrogen) pressure for
conformance to Table A.
6. Releasing device — Check outlet of the releasing devices
(i.e., hydraulic manual emergency station and solenoids)
for leakage. Also verify that tubing drain lines from releasing
devices are not pinched or crushed which could prevent
proper releasing of the EX Valve.
7. Testing alarms — Open the alarm test valve permitting
water from the supply to flow to the electric sprinkler
alarm switch and to the mechanical sprinkler alarm (water
motor). After testing, close this valve securely. Push in on
the plunger of ball drip valve until all water has drained
from the alarm line.
8. Operational test — Open the Model B Manual Emergency
Station. Alternatively, deplete pneumatic pressure from the
sprinkler system. Note: AN OPERATIONAL TEST WILL
CAUSE THE MODEL EX VALVE TO OPEN AND FLOW
WATER INTO THE SPRINKLER SYSTEM.
9. Secure the Model B Manual Emergency Station in the OFF
position with nylon tie after EX Valve is reset.
Testing Detection System Without Operating
Model EX Valve
1. Close the valve controlling water supply to the system
valve and open the main drain valve.
2. Verify that valve supplying hydraulic pressure to the piston/
pushrod chamber is open, allowing water to enter the
pushrod chamber.
3. Deplete pneumatic pressure from the sprinkler system.
4. Loss of pneumatic pressure must result in a sudden drop
of water pressure in the pushrod chamber, as indicated by
the pressure gauge on the hydraulic release trim.
5. Reset the valve per the reset instructions.
7.
Bulletin 739
June 2020
Page 7 of 9
www.reliablesprinkler.com
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