Recessed Installation: Pendent Sprinklers
Figure 2
Wrenches
Model W2 (pendent)
Model W4 (recessed pendent)
Installation
Model F1FR Series sprinklers must be installed with the
W2 (pendent) or W4 (recessed pendent) Reliable sprinkler
installation wrench as identified in this Bulletin. Any other wrench
may damage the sprinkler. The Models W2 and W4 wrenches
have two sets of jaws. Use the smallest set of jaws that fit the
wrench flats of the sprinkler. A leak tight sprinkler joint can be
obtained with a torque of 8 to 18 lb-ft (11 to 24 N-m). Do not
tighten sprinklers over the maximum recommended installation
torque. Exceeding the maximum recommended installation
torque may cause leakage or impairment of the sprinkler.
Both the Model W2 and W4 wrench have two sets of jaws.
Use the smallest set of jaws that fit on the wrench flats of the
sprinkler. The Model W4 wrench is used in conjunction with
a nominal 1/2” square drive ratchet with a nominal 5” long
extension (not provided).
Glass bulb sprinklers have orange bulb protectors or protective
caps to minimize bulb damage during shipping, handling
and installation. Reliable sprinkler installation wrenches are
designed to install sprinklers with bulb protectors in place.
Remove the bulb protector at the time when the sprinkler
system is placed in service for fire protection. Removal of the
bulb protector before this time may leave the bulb vulnerable
to damage. Remove bulb protectors by undoing the clasp by
hand. Do not use tools to remove bulb protectors.
Bulletin 183
October 2020
Page 3 of 4
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