Page 1
1. PARTS
A. Foamer Assembly
B. Plastic chemical supply tubing w/ foot valve and ceramic weight
C. Metering tip kit
D. Outlet hose 25’ long (optional accessory)
E. Shut-off valve (opt ional accessory)
2. 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 into the ball valve (not
included), 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 floo r. The
unit should be mounted no more t han 6’ above t he chemical container; greater lifts reduce injection
capacity.
DEMA Model 294D Spray Foam
INSTALLATION INSTRUCTIONS
HOSE SIZE
AND LENGTH
25’ of ¾” ID
50’ of ¾” ID
25’ of ½” ID
3. CHEMICAL ADJUSTMENT
Caution: Use care when handling hazardous chemicals.
Chemical dilution rat es are set with a t ip screwed into the inlet barb on the metering block. Select the
proper t ip using Table 3 as a guide. Cut the inlet tubing to a convenient length so that it reaches from the
bo ttom o f th e ch emica l contain e r to t h e ch e mical in let . Slip the ceramic weight ov e r t h e tu b in g a n d in sert
the end with the foot valve into the chemical. Attach the o ther end of the t ubing to the barb of the
chemical inlet.
4. 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 flow.
WATER FLOW (GPM)
AIR FLOW (SCFM)
Table 1
MIN. PRESSURES
Water Air
40 psi 40 psi
50 psi 40 psi
60 psi 40 psi
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-661 Page 1 of 5
REV. E-31025 12/22/05
Page 2
Metering Tip
Color
DEMA Model 294D Spray Foam
INSTALLATION INSTRUCTIONS
TABLE 3
Induction Rates for Visc osities Shown
1 cps 75 cps 200 cps 500 cps
Oz/Gal Ratio Oz/GalRatio Oz/Gal Ratio Oz/GalRatio
Clear
Purple
Yellow
Green
Pink
Turquoise
Black
Gray
Red
Blue
Brown
White
Orange
Lt. Blue*
0.84 152-1 0.65 197-1 0.45 284-1 0.30 427-1
1.35 95-1 1.10 116-1 0.90 142-1 0.60 213-1
2.40 53-1 2.00 64-1 1.50 85-1 1.10 116-1
4.20 30-1 3.40 38-1 2.65 48-1 2.10 61-1
5.25 24-1 4.50 28-1 3.45 37-1 2.60 49-1
9.40 14-1 7.25 18-1 5.45 23-1 3.70 35-1
11.75 11-1 8.80 15-1 6.35 20-1 4.20 30-1
14.50 9-1 10.80 12-1 7.75 17-1 4.75 27-1
18.00 7-1 13.20 10-1 8.30 15-1 5.00 26-1
20.60 6-1 14.70 9-1 8.65 14.8-1 5.20 25-1
24.10 5-1 16.15 8-1 9.30 14-1 5.50 23-1
27.50 4.7-1 17.80 7-1 9.70 13-1 5.70 22-1
30.00 4.3-1 18.50 6.9-1 10.10 12.7-1 5.85 21.9-1
32.00 4-1 18.90 6.8-1 10.20 12.5-1 6.00 21-1
Tan*
None
All induction rat es are based on 40 psi wat er pressure and 40 psi air pre ssure.
32.50 3.9-1 19.25 6.6-1 10.40 12.3-1 6.25 20.5-1
34.25 3.7-1 20.45 6-1 10.60 12-1 6.50 20-1
*These tips are not included in the standard tip pack.
1 cps (centipoise) is equal to the viscosity of water
75 cps is approximately equal to the viscosity of 10 weight motor oil
200 cps is approximately equal to the viscosity of most dishwashing detergents
Injection rate can be doubled with no tip by using 1/2in I.D. inlet tubing. Use a short piece of 3/8 in. I.D. typing
on p rop ortioner and fo ot valve barb fo r bushing.
Form I-661 Page 2 of 5
REV. E-31025 12/22/05
Page 3
DEMA Model 294D Spray Foam
5. SERVICING
Caution
that check valve parts are in place.
: When servicing, be sure that replacement parts have been install according to drawing. Be certain
INSTALLATION INSTRUCTIONS
Problem
Unit will not draw or stops drawing chemical 1, 2, 3, 5, 6, 10, 11, 12, 13, 15, 16
Poor foam quality 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
Foam output is too wet 1, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 16
Foam output is too dry 2
Water is flowing into chemical container 12
Foam does not clean adequately 4, 8, 11, 14
See s ituation:
POSSIBLE SITUATIONS
SITUATION CAUSE SOLUTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Chemical tube not immersed in
chemical or chemical depleted.
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
Chemical to water ratio is too low. Change metering tip to one that is larger.
Foam hose is kinked. St raight en hose .
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 effect ive detergent, and be sure that product
Using oil on the airline may deteriorate
the quality of the foam.
Holes or cuts are in chemical inlet tube. Replace the tube.
Strainer and/or metering tip is blocked. Remove, clean o r replace.
Solution check valve is not working. Remove, clean 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
Rust or build-up is clogging the foamer
aspirator.
Water scale or chemical build-up may
have formed in the water jets.
Immerse tu b e in c hemic al or replace.
decrease air pressure.
is rec ommended for foaming.
Us e only clean, d ry a ir.
off before it dries.
Dis conne ct water from un it and visu ally inspect.
Remove blockage.
Place the c hemic al tube in descalin g acid and comple tely
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, disassemble unit and soak
foamer body in descaling acid.
Form I-661 Page 3 of 5
REV. E-31025 12/22/05
Page 4
DEMA Model 294D Spray Foam
INSTALLATION INSTRUCTIONS
Return Policy
No merchandise may be returned for credit without DEMA Engineering Company’s writt en permission. Return
Merchandise Authorization (RMA) number required in advance of return.
Warranty
DEMA product s ar e war ranted against defective material and wo rkmanship under normal use and service for o ne
year from the date of manufacture. This limited warranty does not apply to any products 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 expendable and are not covered under warranty. This warranty 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 part s should be returned to the factory with transportation prepaid. If inspection shows them
to be defective, they will be repaired o r replaced without charge. F.O. B. factory DEMA assumes no liability for
damages. Return merchandise authorization number t o ret urn units for repair or replacement must be granted in
advance of return.
Form I-661 Page 4 of 5
REV. E-31025 12/22/05
Page 5
DEMA Model 294D Spray Foam
INSTALLATION INSTRUCTIONS
22
4
6
8
13
15
19
16
18
17
11
12
14
27
10
22
23
24
25
26
21
3
5
7
9
20
OPTIONAL ACCESSORIES
1
29
30
31
32
33
28
NO. PART NO. DESCRIPTION
1 93-2 Pressure Guage
2 93-1 Pressure Regulator
3 29-18-2 5/16 Snap Ring
4 2917-3 Stainl ess S teel Washer
5 90-34V Air Check Valve O-Ring (Viton)
6 26-49P Ball 3/16” Dia. (Teflon)
7 93-6-2 Air Check Valve Spring
8 29-14 Air Nozzle Adapter
9 30-5V-14 O-Ring (Viton)
10 29-6-1 Foam er Body
11 29-15 Pin
12 29-11 Diffuser
13 29-16 Water Nozzle
14 100-24 Ball 11/32” Dia. (Teflon)
15 29-7 O-Ring (Viton)
16 29-17-2 Stai nless St eel Washer
17 29-18-4 7/16” Snap Ring
18 150-6 Rubber Wash er
19 93-19 I nlet Hose Adapter
20 29-8 Outlet
34
NO. PART NO. DESCRIPTION
21 29-12 C heck Valve Repair Kit
22 25-29V Metering Knob O-Ring (Viton)
23 23-34-3 Check Valve Core
24 23-9-2 Check Valve Spring
25 23-10 Check Valve Ball (9/32” Dia. Stainless
Steel)
26 23-11V Check Valve O-Rng (Viton )
27 24-59-5 Metering Knob
28 61-9
61-9K
Metering Tip (Specify Color) or
Metering Tip Kit
29 61-107 C erami c Weight
30 24-11L Foot Strainer
31 100-12L ½” OD Vinyl Tubing x 8’ Lg.
32 29-10 HI-LO Screw (4 Req’d)
ACCESSORIES
NO. PART NO. DESCRIPTION
33 93-14 ¾” ID 25’ Lg. Outlet Hose
34 93-18 Plastic Foam Wand
Form I-661 Page 5 of 5
REV. E-31025 12/22/05
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