SECTION 8 – MAINTENANCE EXAMINATION
UL EX3470 ULC EX3470
2014-SEP-01 REV. 11 PAGE 8-3
R-102 Restaurant Fire Suppression Manual
SEMI-ANNUAL MAINTENANCE EXAMINATION (Continued)
Alternate Test Method: (Continued)
12. Examine threads on each tank adaptor and tank collar for
nicks, burrs, or cross-threading. Clean and coat o-ring with
a good grade of extreme temperature grease. See Figure
8-4. Remove 1/4 in. vent plug and clean and inspect for
free movement and corrosion (if necessary, replace Vent
Plug (Part No. 74247)). Reinstall vent plug. Make certain
bursting disc is in place and silver side is away from tank.
Clean seating surface and return adaptor/tube assembly to
each tank. Tighten securely.
O-RING
SILVER SIDE OF DISC
AWAY FROM TANK
FIGURE 8-4
000364
13. Place fully charged tanks in enclosures and/or brackets and
secure.
14. Carefully assemble and wrench tighten all expellant gas and
agent distribution piping.
15. Remove blow-off caps from nozzles. Inspect each blow-off
cap and replace if deteriorated. On older style metal blow-
off caps with spring clips, make certain spring clip rotates
freely on cap. On newer metal blow-off caps, make certain
integral o-ring is intact and undamaged. If there are signs of
deterioration, replace cap(s).
NOTICE
Rubber blow-off caps that have been
installed in the system for one year or
more must be replaced.
16. Verify that all nozzle types are correct. Check all nozzles
to ensure that they are free of cooking grease build-up and
have a thin coating of clean silicone grease across the
orifice.
Note: Do not allow silicone grease to enter nozzle orifice.
Note: If there is any evidence of cooking grease or other
residue in the nozzles or distribution piping or agent or
agent residue in the distribution piping, the entire piping
network must be inspected and thoroughly cleaned.
Portions of piping that cannot be thoroughly cleaned must
be replaced.
Utilizing the Nozzle Aiming Device (Part No. 431992 or Part
No. 439877) ensure that all nozzles are correctly aimed at
the appropriate location on the appliance. Reinstall blow-off
caps.
17. Remove the lock bar or lock pin and manually test the regu-
lated release assembly by operating the remote manual
pull station. Check pull station cover for damage or wear.
Replace cover if cable has worn a groove in the cover as
deep as the diameter of the cable. If flexible conduit is used
in installation, check conduit for damage, cuts and sharp
bends.
18. Cock the regulated release mechanism using cocking lever
(Part No. 14995 or 435603/Part No. 441042 or 441041).
See Figure 8-5.
Before proceeding with Step 18, test electric (snap-action)
switches:
a. With the AUTOMAN in the cocked or ready position,
press the lever of each switch up. If the switch is working
properly, there should be an audible click.
b. With the AUTOMAN in the fired position, press the lever
of each switch up, there should be no audible click.
c. If an audible click is heard in the fired position several
adjustments can be made. The trip lever extension pin
can be rotated so the peak of one of the hex points is
pointed up against the switch levers. Tighten it in that
position. If this doesn’t resolve the problem, loosen the
screws holding the switches, apply a small counterclock-
wise torque on the switches and retighten the screws. If
necessary, a final adjustment can be made by removing
the snap action switch and bending the lever slightly.
d. After adjustments, repeat Steps a. and b. Then, recock
AUTOMAN and insert lock bar or lock pin.
FIGURE 8-5
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