Page 1
DEMA Model 294DDF Spray Foam
I. PARTS
A. Foamer Assembly
B. 2 pcs. Plastic chemical supply tubing w/ foot valve and ceramic weight
C. Metering tip kit
D. Outlet hose 25’ long (optional acc essor y)
E. Shut-off valve (optional accessor y)
II. INSTALLATION
A. Water inlet is ¾” garden hose swivel. It may be removed to connect to ½” pipe.
B. Air inlet is ¼” NPT. CAUTION: When tightening air supply fittings to the ball valve, be sure to
secure the ball valve with a wrench or other similar tool. Avoid rotating ball valve when tightening
air supply fittings.
C. Foam outlet is ¾” garden hose. Attach shut-off valve to end of hose. See Table 1 for hose limitations.
D. Detergent can be drawn directly from any chemical container, which may be set on the floor. The unit
shou l d be mou nted no more than 6’ above the chemical container; greater lift s reduce injecti on capa ci ty.
INSTALLATION INSTRUCTION
Table 1
HOSE SIZE MIN. PRESSURES
AND LENGTH Water Air
25' of 3/4" ID
50' of 3/4" ID
25' of 1/2" ID
40 psi 40 psi
50 psi 40 psi
60 psi 40 psi
III. CHEMICAL ADJUSTMENT
Caution: Use care when handling hazardous chemicals.
Chemical dilution rates are set with a tip screwed into the inlet barb on the metering block. Select the proper tip
using Table 3 as a guide. Cut the inlet tubing to a convenient length so that it reaches from the bottom of the
chemical container to the chemical inlet. Slip the ceramic weight over the tubing and insert the end with the foot
valve into the chemical. Attach the other end of the tubing to the barb of the chemical inlet.
IV. OPERATION
Open the shutoff valve at the end of the hose. Turn on air supply and set at 40 psi. Turn on water supply. See
Table 2 for water and air flows.
WATER FLOW (GPM)
AIR FLOW (SCFM)
Table 2
Pressure (PSI)
40 50 60 80
1.4 1.6 1.7 2.1
3.5 4.2 4.8 6.1
Form I-662 Page 1 of 4
REV. E-31025 12/22/05
Page 2
DEMA Model 294DDF Spray Foam
INSTALLATION INSTRUCTION
V. SERVICING
Caution
certain check valve parts are in place.
Problem See situation:
Unit will not draw or stops drawing chemical 1, 2, 3, 5, 6, 10, 11, 12, 13, 15, 16
Poor foam qua lity 1, 2, 3, 5, 6, 10, 11, 12, 13, 15, 16
Foam surges 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 15, 16
Foa m out p u t is t oo w et 1, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 16
Foa m ou t put is t oo dry 2
Water is flowing into chemical container 12
Foam does not clean adequately 4, 8, 11, 14
: When servicing, be sure that replacement parts have been installed according to drawing. Be
POSSIBLE SITUATIONS
SITUATION CAUSE SOLUTION
1
Che mic al tube no t immerse d in
Immerse tube in chemical or replace.
chemical or chemical depleted .
2
3
Air pressure is too high for water. Adjust air regulator down.
Water pressure is too low. At least 30 psi is required. Increase if possible, or
decrease air pressure.
4
5
6
7
8
Chemical to water ratio is too low. Change metering tip to one that is larger.
Foam hose is kinked. Str aig hten ho se .
Foam hose is too long or wrong size. See table 1.
Air supply is inadequate. Increase air pressure by regulating up.
Detergent is wrong. Use a more effective detergent , and be sure that
product is recommended for foaming.
9
Using oil on the airline may deteriorate
Use only clean, dry air.
the quality of the foam.
10
Hole s or cuts are in c h emical inlet
Replace the tube.
tube.
11
12
13
14
Strainer and/or metering tip is blocked. Remove, clean or replace.
Solution check valve is not working. Remove, c lean or replace.
Air regulator is not working. Remove, clean or replace.
Soil has hardened on surface. Reapplication may be necessary. Be sure to rinse
foam o ff before it dries.
15
16
Rust or build-up is clogging the foamer
aspirator.
Water scale or chemical build-up may
have formed in the water jets.
Disconnect water from unit and visually inspect.
Remove blockage.
Place the chemical t ube in desca ling acid and
completely open the shut-off valve. Let unit run
until the chemical tube is fill with acid, then close
the shut-off valve and water supply. Elevate the
chemical tubing and outlet hose until acid has had
enough time to descale. Repeat if necessary. For
severe cases, disasse mble unit and so ak foamer
body in descaling acid.
Form I-662 Page 2 of 4
REV. E-31025 12/22/05
Page 3
DEMA Model 294DDF Spray Foam
INSTALLATION INSTRUCTION
Return Policy
No merchandise may be returned for credit without DEMA Engineering Company’s written permission. Return
Merchandise Authorization (RMA) number required in advance of ret urn.
Warranty
DEMA products are warranted against de fect ive material and workmanship under normal use and service for
one year from the date of manufacture. This limited warranty does not app ly to any product s which have a
normal life shorter than one year or failure and damage caused by chemicals, corrosion, improper voltage
supply, physical abuse or misapplication. Rubber and synthetic rubber parts such as “O”-rings, diaphragms,
squeeze tubing and gaskets are considered e xpendable and are not covered under warranty. This warr anty is
extended only to the original buyer of DEMA products. If products are altered or repaired without prior
approval of DEMA, this warranty will be void.
Defective units or parts should be returned to the factory with transportation prepaid. If inspection shows them
to be defective, they will be repaired or replaced without charge. F.O.B. factory DEMA assumes no liability for
damages. Return merchandise authorization number to return units for repair or replacement must be granted in
advance of return.
Form I-662 Page 3 of 4
REV. E-31025 12/22/05
Page 4
DEMA Model 294DDF Spray Foam
INSTALLATION INSTRUCTION
1
19
11
12
14
15
13
16
10
17
30
2
3
4
5
20
6
7
9
2
1
8
18
23
21
29
22 24
25
26
31
32
28
27
34
33
NO. PART NO. DESCRIPTION
1 29-10 HI-LO Screw (4 Req’d)
2 23-32T-2 Meter ing Knob
3 23-11V Check Valve O-Rng (Viton)
4 29-9 Check Valve Ball (9/32” Dia. Viton)
5 23-9 Check Valve Spring
6 23-34-3 Ch eck Valve Core
7 25-29V Metering Knob O-Ring (Viton)
8 29-12 Check Valve Repair Kit
9 29-15 Pin
10 29-8 Outlet
11 29-6-1 Foam er Bod y
12 30-5V-14 O-Ring (Viton)
NO. PART NO. DESCRIPTION
21 29-11 Diffuser
22 29-16 Water Nozzle
23 29-5P Ball 3/1 6” Dia. (Rubber )
24 29-7 O-Ring (Viton)
25 29-17-2 St ainless Steel Washer
26 29-18-2 5/16 Snap Ring
27 150-6 Rubber Washer
28 93-19 Inlet Hose Adapter
29 100-12L ½” OD Vinyl Tubing x 8’ Lg.
30 61-107 Ceram ic Weight
31 24-11L Foot Strainer
32 61-9K Metering Tip Kit
13 29-14 Air Noz zl e Adapter
14 93-6-2 Air Check Valve Spring
15 26-49P Ball 3/16” Dia. (Teflon)
16 90-35V Air Check Valve O-Ring (Viton)
17 2917-3 Stainless Steel Wa sher
18 29-18-2 5/16” Snap Ring
19 93-1 Pressu re Regulator
NO. PART NO. DESCRIPTION
33 93-18 Plastic Foam Wand
34 93-14 ¾” ID 25’ Lg. Outlet Hose
20 93-2 Pressure Guage
Form I-662 Page 4 of 4
REV. E-31025 12/22/05
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