DEMA SPRAY FOAM MODELS 294CV-2 AND 294CV-4
INSTALLATION INSTRUCTIONS
I-147
Pg. 1 of 3
Rev. B10/01
1. PARTS
A. Foamer Assembly
B. Hose to ½" NPT Coupling
C. Plastic tubing with foot strainer and ½” ID ceramic weight
D. Spray nozzles with adjustable joints
(2 with 294CV-2, 4 with 294CV-4)
2. INSTALLATION
A. Connect water compressed air and spray nozzles as shown in
figures 1 and use ½" or larger pipe or tubing in spray
manifold.
B. Power. Connect solenoid coil leads to power source. Coils
are 120 volt/60hz unless otherwise specified. (Refer to coil
housing.)
C. Detergent nay be drawn directly from any size container,
which usually is set on the floor. Use the plastic tubing for
connecting to the injector barb. First, cut to desired length
then slip the ceramic weight over the tube and drop the end
with the strainer into the container.
TABLE 1
VISCOSITY CPS
1
75
220
500
MAX. OZ/GAL.
27
13
10
9
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
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 caution when handling hazardous chemicals.
The recessed screw in the metering knob controls the
detergent feed rate. Turning the screw in (clockwise) will
decrease
the detergent feed rate; backing the screw out
(counterclockwise) will
increase
the rate to the maximums shown in Table 1. To increase dryness of foam, raise air
pressure 5 PSI. Repeat if necessary. See Table 2 for water and air flows.
5. SERVICING
CAUTION: Turn off air, water, and electricity before servicing.
If flow surges and unit fails to make foam:
A. Is the metering screw backed off?
B. Is there electrical power to both solenoids?
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 the foot strainer clogged? Lift from drum and clean.
B. Is the detergent check valve clogged? Remove the 4 metering knob screws and inspect 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
.
