
ΙΙ
-22
ROTARY GEAR PUMP
ELECTRONIC FOAM PROPORTIONING SYSTEM
Section
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: Installation
each of the other ports. The bypass port on
the ADT is identified by a label above the
port.
Bypass hose connections are ½ inch NPT
threads. Hose fittings compatible with all
foam concentrates to be used must be
provided. The hose from the BYPASS port is
plumbed to the atmosphere and should not
receive high pressures. This hose is used for
calibrating the foam pump, pumping the
concentrate into a container to empty the
foam tank or to assist in priming of the foam
pump. The hose from the BYPASS port must
be long enough to reach a container
outside the truck. This hose must be coiled
for storage when not in use.
If the handle or placard is removed from
the bypass valve for repairs or to facilitate
remote mounting make sure they are
installed on the valve correctly. Make sure
the tang on the handle engages the cast
stops as shown in figure 2-20.
ADT AIR CONNECTIONS
If the ADT option is used, install the
operating switch and indicator light placard
for the ADT on the apparatus operator
panel. A mounting cutout diagram is
provided as figure 2-21
After mounting the placard assembly install
the air hoses from the ADT to the placard
assembly. Make sure proper connections
are made at the placard assembly as
indicated in figure 2-22. A color coded
decal attached to the ADT valve assembly
along with an optional color coded air hose
harness simplifies air hose connections. If
the optional air hose harness is not used ¼
inch inside diameter air brake tubing can
be substituted. Make sure the air brake
tubing selected has the proper DOT
approval. When cutting the air harness or
air brake tubing to size make sure the ends
are square using a tubing cutter or razor
knife.
Figure 2-20. Bypass Valve Assembly
ACORN NUT
BYPASS HOSE
CONNECTION
INJECT HOSE
CONNECTION
PLACARD
CAST
BOSSES
HANDLE
TANG
PLACARD
SCREWS
HANDLE