Page 1
DEMA® MODEL 294DC FOAMER & 294DC-DS DROP
STATION FOAMER
INSTALLATION INSTRUCTION
NOTE: 294DC-DS is intended for use with another mixing device and to be used as a foaming drop station.
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 (optional accessory)
2. MOUNTING
Hold the unit in position on the wall and locate the positions for the mounting screws. Drill holes in wall
approximately 1” deep and insert mounting anchors. Install top 2 mounting screws, leaving approximately
1/8” extension between the wall and screw head. Mount the Foamer unit by inserting the screw heads through
the keyhole slots in the cover and tighten the screws. Screw the bottom 2 screws into the wall to secure.
Note: Attach proper air supply fittings before mounting unit to wall. See caution warning in Section 3
for air inlet.
3. INSTALLATION
This product is designed only to be used as described in this instruction sheet. Adhere to all warnings and
cautions identified in this document.
WARNING: Installations must conform to all local and national plumbing codes and use
approved backflow prevention and pressure relief devices where required.
ALWAYS DISCONNECT DISPENSER FROM WATER SOURCE WHEN DISPENSER
IS NOT IN USE.
Always read SDS for all chemicals used and follow personal protective guidelines.
A. Water inlet is 3/4” garden hose swivel.
B. Air inlet is 1/4” NPT. CAUTION: When tightening air supply fittings into 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 3/4” garden hose. Attach shut-off valve to the end of the 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
should be mounted no more than 6’ above the chemical container; greater lifts reduce injection capacity.
Form I-739 Page 1 of 7
Rev. F-40211
Page 2
DEMA® MODEL 294DC FOAMER & 294DC-DS DROP
STATION FOAMER
INSTALLATION INSTRUCTION
4. 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.
5. 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 flow and airflow.
TABLE 1 TABLE 2
HOSE SIZE
AND LENGTH
Water Air Water Air
25’ of 3/4” ID
50’ of 3/4” ID
25’ of 1/2” ID
MIN.
PRESSURES
40 psi 40 psi
50 psi 40 psi
60 psi 40 psi
MAX.
PRESSURE
125 psi 125 psi
Maximum Temperature – 150°F (65.5°C)
WATER
FLOW (GPM)
AIRFLOW
(SCFM)
Pressure (PSI)
40 50 60 80
1.4 1.6 1.7 2.1
3.5 4.2 4.8 6.1
Form I-739 Page 2 of 7
Rev. F-40211
Page 3
DEMA® MODEL 294DC FOAMER & 294DC-DS
DROP STATION FOAMER
INSTALLATION INSTRUCTION
Metering Tip
Color
Clear
Purple
Yellow
Green
Pink
Turquoise
Black
Gray
Red
Blue
Brown
White
Orange
Lt. Blue*
Tan*
None
All induction rates are based on 40 psi water pressure and 40 psi air pressure.
1 cps 75 cps 200 cps
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
0.84 152-1 0.65 197-1 0.45 284-1 0.30 427-1
1.35
2.40
4.20
5.25
9.40
11.75 11-1 8.80 15-1 6.35 20-1 4.20 30-1
14.50
18.00
20.60
24.10
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
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
95-1 1.10 116-1 0.90 142-1 0.60 213-1
53-1 2.00 64-1 1.50 85-1 1.10 116-1
30-1 3.40 38-1 2.65 48-1 2.10 61-1
24-1 4.50 28-1 3.45 37-1 2.60 49-1
14-1 7.25 18-1 5.45 23-1 3.70 35-1
9-1 10.80 12-1 7.75 17-1 4.75 27-1
7-1 13.20 10-1 8.30 15-1 5.00 26-1
6-1 14.70 9-1 8.65 14.8-1 5.20 25-1
5-1 16.15 8-1 9.30 14-1 5.50 23-1
4-1 18.90 6.8-1 10.20 12.5-1 6.00 21-1
*These tips are not standard tip pack.
6. SERVICING
Caution: When servicing, be sure that replacement parts have been install according to
drawing. Be certain that check valve parts are in place.
TABLE 3
Induction Rates for Viscosities Shown
500 cps
Problem See situation:
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
Form I-739 Page 3 of 7
Rev. F-40211
Page 4
DEMA® MODEL 294DC FOAMER & 294DC-DS
DROP STATION FOAMER
INSTALLATION INSTRUCTION
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 decrease air
Chemical to water ratio is too low. Change metering tip to one that is larger.
Foam hose is kinked. Straighten 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 effective detergent, and be sure that product is
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 or 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 off
Rust or build-up is clogging the foamer
aspirator.
Water scale or chemical build-up may
have formed in the water jets.
Immerse tube in chemical or replace.
pressure.
recommended for foaming.
Use only clean, dry air.
before it dries.
Disconnect water from unit and visually inspect. Remove
blockage.
Place the chemical tube in descaling 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, disassemble unit and soak foamer body in descaling
acid.
Form I-739 Page 4 of 7
Rev. F-40211
Page 5
7
8
DEMA® MODEL 294DC FOAMER & 294DC-DS
DROP STATION FOAMER
INSTALLATION INSTRUCTION
294DC Assembly
OPTIONAL ACCESSORIES
39
36
25
26
40
38
37
22
23
24
6
1
5
17
19
41
16
18
20
21
3
4
15
34
10
12
14
29
30
31
32
33
35
2
7
9
11
13
2
28
NO. PART NO. DESCRIPTION
1 16-11 Ball Valve (1/4” NPT)
2 25-137-9U Close Nipple (1/4” NPT)
3 93-1 Pressure Regulator
4 93-103-1 Pipe Nipple (1/8” NPT)
5 93-102-1 Elbow (1/8” NPT)
6 93-15-1 Pressure Gauge
7 29-18-2 5/16” Internal Snap Ring
8 29-17-3 Stainless Steel Washer
9 90-35V Air Check Valve O-Ring
10 26-49P Ball 3/16” Teflon
11 93-6-2 Air Check Valve Spring
12 29-14 Air Nozzle Adapter
13 30-5V-14 O-Ring
14 29-6-1 Foamer Body
15 29-15 Pin
16 29-11 Diffuser
17 29-16 Water Nozzle
18 29-5P Ball – 11/16” Dia.
19 29-7 O-Ring
20 29-17-2 Stainless Steel Washer
21 28-18-4 7/16” Snap Ring
22 93-105-1 Reducing Coupling (1/2”
NPT x 3/8” NPT)
NO. PART NO. DESCRIPTION
23 65-2 Ball Valve (3/8” NPT)
24 93-104-1 Swivel Adapter Stem
25 65-10 Coupling
26 100-38 Strainer Washer
27 29-8 Outlet
28 29-12 Check Valve Repair Kit
29 25-29V Metering Knob O-Ring
30 23-34-3 Check Valve Core
31 23-9-2 Check Valve Spring
32 23-10 Teflon Ball - 9/32” Dia.
33 23-11V Check Valve O-Ring
34 23-32T Metering Knob
35 61-9
61-9K
Metering Tip (Specify Color
or Metering Tip Kit)
36 29-10 Hi-Lo Screw (4 Reqd.)
37 61-107 Ceramic Weight
38 24-11L Foot Strainer
39 100-12L ½”OD Vinyl Tubing x 8’Lg.
OPTIONAL ACCESSORIES
NO. PART NO. DESCRIPTION
40 93-18 Spray Wand
41 93-14 ¾”ID x 25’Lg. Outlet Hose
Form I-739 Page 5 of 7
Rev. F-40211
Page 6
DEMA® MODEL 294DC FOAMER & 294DC-DS
DROP STATION FOAMER
INSTALLATION INSTRUCTION
294DC-DS Assembly
NO. PART NO. DESCRIPTION
1 16-11 Ball Valve (1/4” NPT)
2 25-137-9U Close Nipple (1/4” NPT)
3 93-1 Pressure Regulator
4 93-103-1 Pipe Nipple (1/8” NPT)
5 93-102-1 Elbow (1/8” NPT)
6 93-15-1 Pressure Gauge
7 29-18-2 5/16” Internal Snap Ring
8 29-17-3 Stainless Steel Washer
9 90-35V Air Check Valve O-Ring
10 26-49P Ball 3/16” Teflon
11 93-6-2 Air Check Valve Spring
12 29-14 Air Nozzle Adapter
13 30-5V-14 O-Ring
14 29-6-1 Foamer Body
15 29-15 Pin
16 29-5P Ball – 11/16” Dia.
17 29-7 O-Ring
18 29-17-2 Stainless Steel Washer
19 28-18-4 7/16” Snap Ring
20 93-105-1 Reducing Coupling (1/2”
NPT x 3/8” NPT)
NO. PART NO. DESCRIPTION
21 65-2 Ball Valve (3/8” NPT)
22 93-104-1 Swivel Adapter Stem
23 65-10 Coupling
24 100-38 Strainer Washer
25 29-8 Outlet
26 29-12 Check Valve Repair Kit
27 25-29 Metering Knob O-Ring
28 23-34-7 Check Valve Core
29 24-23 Check Valve Spring
30 23-10 Teflon Ball
31 24-25 Check Valve O-Ring
32 24-32T Metering Knob
33 100-15-18 Metering Tip
34 29-10 Hi-Lo Screw (4 Reqd.)
Form I-739 Page 6 of 7
Rev. F-40211
Page 7
DEMA® MODEL 294DC FOAMER & 294DC-DS
DROP STATION FOAMER
INSTALLATION INSTRUCTION
RETURNS: NO MERCHANDISE MAY BE RETURNED FOR CREDIT WITHOUT
DEMA’S WRITTEN PERMISSION. RETURN MERCHANDISE
AUTHORIZATION NUMBER REQUIRED IN ADVANCE OF RETURN.
WARRANTY: DEMA products are warranted against defective material and workmanship
under normal use and service for one 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 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-739 Page 7 of 7
Rev. F-40211
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