I-148
Pg. 1 of 3
Rev. A0500
FOAM OUTLET
FIGURE 1
DETERGENT INLET
METERING SCREW
WATER INLET
PRESSURE REGULATOR
AND GUAGE
AIR INLET
DEMA SPRAY FOAM MODEL 294CDF
(DUAL FEED, LINE PRESSURES)
INSTALLATION INSTRUCTIONS
1.
PARTS
A. Foamer assembly
B. 2 pcs. plastic supply tubing with strainer
*C. Outlet hose ¾” ID x 25’ lg.
*D. Shutoff valve
*Optional
2.
INSTALLATION
A. Water inlet is ¾” garden hose swivel. It may be removed if
attaching to ½” pipe.
B. Air Inlet is ¼” NPT female pipe.
C. Foam outlet is ¾” garden hose. See Table 1 for hose
limitations.
D. Detergent may be drawn directly from any size container
which is usually set on the floor. Use the plastic tubing for
connecting to the injector barbs. First cut to desired length
and then drop the end with the strainer into the container.
MIN. PRESSURES
HOSE SIZE AND
LENGTH
WATER
AIR
25' of 3/4" ID
40 PSI
40 PSI
50' of 3/4" ID
50 PSI
40 PSI
25' of 1/2" ID
60 PSI
40 PSI
TABLE 1
VISCOSITY CPS
1
75
220 500
MAX. OZ/GAL.
33
31
28
24
TABLE 2
PRESSURE PSI
40
50
60
80
WATER
FLOW
GPM 1.4 1.6 1.7 2.0
AIR FLOW SCFM
3.5 4.2 4.8 6.1
TABLE 3
3.
OPERATION
Open shutoff valve at end of hose. Turn on air supply. Set pressure at 40 PSI. Turn on water supply.
4.
ADJUSTMENT
WARNING:
Use care when handling hazardous chemicals. Adjust detergent feed rate by turning recessed screws in the square
knobs. Turning to the left increases the rate to the maximums shown in Table 2. To increase dryness of foam, raise air pressure 5
PSI. Repeat if necessary. See Table 3 for water and air flows.
5.
SERVICING
CAUTION:
Turn off air and water supplies before servicing.
If flow surges and unit falls to make foam:
A. Is the metering screw backed off?
B. Is the outlet hose too small or too long?
C. Is there sufficient water and air pressure? At least 30 PSI is required.
D. Does the detergent contain a foaming agent?
E.
Is the foamer outlet attached to a manifold with too few or too small nozzles? They should have a combined water rating of
20 GPM @40 PSI.
If unit stops operating:
A. Is a foot strainer clogged? Lift from drum and clean.
B. Is a detergent check valve clogged? Remove the 4 screws in a square knob. Remove knob to inspect and clean check valve
ball, spring and o-ring.
CAUTION:
When servicing unit be sure that replacement parts have been installed according to drawing. Be certain check valve
parts are in
place.
