Elkhart Brass HF-500 Hydro-Foam Nozzle - Manual

Hydro-Foam Nozzle
HF-350, HF-350-A, HF-500, & HF-500-A
Operating & Maintenance Instructions
The Hydro-Foam nozzle is one of the most
efficient and effective tools for AFFF firefighting
available today.
The nozzle’s unique design, with built-in
educator, allows it to be attached to any existing
fixed monitor, portable monitor, or deck gun.
The nozzle can also be used with plain water for
cooling exposures or for fire attack. When the
need arises for high application rates of AFFF,
simply inserting the pick-up hose into your foam
supply produces an instant AFFF foam system. In
many cases, knock-down of large fires can be
achieved while hand lines are being pulled for
final extinguishment.
The proportioning rate of these nozzles can be
changed easily in the shop or fire station.
Remove the foam inlet adapter or nipple, and
remove the previously installed foam metering
washer. Note: the HF-350 & 350-A, 6% setting
uses NO metering washer. The metering
washers will be marked 500 or 350 and the
percentage they are to be used for: ½%, 1%, or
3%. Insert new washer into the inlet nipple or
adapter, and thread it back into the nozzle body.
Loctite #262 should be used to secure
adapter/nipple threads.
The HF nozzles are factory set with a 3% metering
washer. A ½% & 1% washer is also provided.
The HF-350 is factory set for 3% proportioning,
for 6% use NO metering washer. Metering
washers for ½% and 1% proportioning are
provided. If you have chosen to use the optional
3-6% metering valve with your nozzle, DO NOT
INSTALL any of these washers.
Illustrations on the back of this sheet show
installation of the various available foam inlet
options. The quick connect coupling is a
convenience option. It allows you to keep the
suction hose stored until the need for foam
arises. You can then quickly attach the hose and
start foam operations. The quarter turn on/off
valve allows you to keep the suction hose
permanently attached to the foam supply and the
instant you need foam you can open the valve.
The 1-3% & 3-6% metering valves are ideal for
quickly switching between two types of foam. (1-
3% & 3-6% valves only available for HF-350 &
350-A)
MAINTENANCE INSTRUCTIONS
The HF-350 & 500 nozzles are constructed of
rugged brass alloys (HF-350-A & 500-A are
aluminum versions). The nozzle tip turns on a
cam mechanism to easily change stream
patterns. This cam should be lubricated
periodically with a light petroleum base grease
to insure smooth operation. If the tip becomes
hard to rotate (change patterns), by removing the
cam screw, you can slide the tip off the nozzle
body. Clean the inside of the tip as well as the
nozzle body and cam slot. Before reassembling,
apply a light coating of grease to the O-rings in
body and tip. Apply grease to cam slot. Clean
excess grease from nozzle after assembly to
prevent adhesion of dirt and grit to close
clearance parts.
As with any other foam appliances, be sure to
flush foam lines with clean water after each use.
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