DEMA 915418-NH Stainless Steel Foam/Rinse Hose Drop Station Instruction Manual

: June 6, 2024
: DEMA

Table of Contents

REQUIREMENTS
OPTIONS
OVERVIEW
SAFETY & OPERATIONAL PRECAUTIONS
TO INSTALL (REFER TO DIAGRAM ON NEXT PAGE)
TO OPERATE
Troubleshooting Guide
Read User Manual Online (PDF format)
Download This Manual (PDF format)

DEMA ENGINEERING
Installation & Operation Instructions
Model # DEMA 915418-NH · LC Foam / Rinse Hose Drop Station

Instruction Manual
demaeng.com

WARNING! READ ALL INSTRUCTIONS BEFORE USING EQUIPMENT!

REQUIREMENTS

Chemical Concentrate

Water

OPTIONS

Dispenser ONLY, No HOSE	# 915418-NH-1
Complete with 15m x 3/4″ Hose	# 915418-NH-1-C1
Complete with 20m x 3/4″ Hose	# 915418-NH-1-C2

OVERVIEW

The LC Foam / Rinse Hose Drop Station is a medium volume foam applicator for projecting foaming chemicals onto any surface up close or at a distance and for rinsing. This unit features a full stainless steel enclosure. The venturi injection system uses standard city water pressure (35 – 125 PSI) to draw and blend chemical concentrate into the water stream to create an accurately diluted solution. Rich, clinging foam is created by injecting compressed air into the solution to greatly increase volume and coverage ability. The foam is then projected through the discharge hose and fan nozzle at distances up to 3.66 meters. Rinse at full pressure through a unique and powerful stainless steel 4-hole nozzle.

DEMA Engineering Company

SAFETY & OPERATIONAL PRECAUTIONS

When connecting to a potable water supply follow all local codes for backflow prevention.
WARNING: Severe damage to your facility, or contamination of your potable water supply, can occur without proper backflow prevention.
For proper performance do NOT modify, substitute the nozzle, hose diameter, or length.
The manufacturer assumes no liability for the use or misuse of this unit.
Wear protective clothing, gloves, and safety goggles when working with chemicals.
Always direct the discharge away from people and electrical devices.
For pressures over 100 PSI, remove the discharge valve or lower pressure.
Never leave inlet ball valves on when the unit is not in use.
Follow the chemical manufacturer’s safe handling instructions.
NEVER mix chemicals without first consulting a chemical manufacturer.

TO INSTALL (REFER TO DIAGRAM ON NEXT PAGE)

Mount the unit to a suitable surface above the chemical supply to prevent siphoning.
Connect the discharge hose.
When connecting to a potable water supply follow all local codes for backflow prevention.
Connect water supply. To prevent blocking the small water jets in the foamer body, flush any new plumbing of debris before connecting. If water piping is older and has known contaminants, install a filter.
Connect air supply. If the airline is older and has known contaminants install a filter.

Set the chemical dilution ratio by threading one of the color-coded metering tips into each chemical check valve. See chemical labels for dilution ratio recommendations or consult your chemical supplier.

For the strongest dilution ratio do NOT install a colored metering tip.
The dilution ratios in the metering tip chart are based on water thin chemicals with a viscosity of 1CPS.
Thicker chemicals will require a larger tip than the ratios shown in the chart.
Application results will ultimately determine the final tip color.
Select the tip color that is closest to your desired chemical strength and thread it into the tip holder. DO NOT
OVER-TIGHTEN.
Push the chemical tube over the check valve barb and place the suction tube in the chemical concentrate.
If necessary, cut suction tube(s) to length before attaching the suction strainer.

TO OPERATE

Always make sure the discharge is closed or pointed in a safe direction before turning the water on. Discharge cabe shut off at any time during operation but should not be left unattended for long periods of time. Expect a strong blast when re-opening the discharge ball valve or trigger gun.
TO FOAM

Make final metering tip adjustments based on application results.
With the wand in hand open the water ball valve and the airball valve.
Open the discharge ball valve.
• Wait a few seconds and observe foam consistency.
• Use the least amount of air needed to achieve good foam quality to prevent water pressure fluctuations from affecting performance. Air pressure must be kept lower than water pressure.
• To adjust the foam consistency pull out on the air regulator knob, turn slightly clockwise for dryer foam and counterclockwise for wetter foam. Wait a few seconds to see each adjustment.
• Medium wet foam will give the best cleaning results! Dry foam will NOT clean as well!
• You may also have to try different sized metering tips and air settings until foam consistency and
cleaning results are acceptable. Once this is set and desired foam consistency is achieved push-lock the
knob on the air regulator. You are ready to start the application.
When foaming is completed, close the discharge ball valve, return to the unit and close the water and airball valves. Briefly re-open the discharge ball valve to relieve pressure in the hose.
Rinse before the foam dries.

TO RINSE

With the spray wand in hand and the discharge ball valve closed open the inlet ball valve.
Open the discharge ball valve to rinse.
When complete, close the discharge ball valve then close the inlet ball valve.
Briefly re-open the discharge ball valve to relieve pressure in the hose.

METERING TIP SELECTION

METERING TIP
COLOR| OZ/MIN| DILUTION RATIO @ 40 PSI
---|---|---
RINSE| FOAM
Brown| 0.56| —| 306:01:00
Clear| 0.88| —| 195:01:00
Bright Purple| 1.38| —| 124:01:00
White| 2.15| —| 80:01:00
Pink| 2.93| —| 59:01:00
Corn Yellow| 3.84| —| 45:01:00
Dark Green| 4.88| —| 35:01:00
Orange| 5.77| —| 30:01:00
Gray| 6.01| —| 29:01:00
Light Green| 7.01| —| 24:01:00
Med. Green| 8.06| —| 21:01
Clear Pink| 9.43| —| 18:01
Yellow Green| 11.5| —| 15:01
Burgundy| 11.93| —| 14:01
Pale Pink| 13.87| —| 12:01
Light Blue| 15.14| —| 11:01
Dark Purple| 17.88| —| 10:01
Navy Blue| 25.36| —| 7:01
Clear Aqua| 28.6| —| —
Black| 50| —| —
No Tip Ratio Up To:| —| 6:01
The dilution ratios above are approximate values. Due to chemical viscosity, actual dilution ratios may vary.
FORMULA
GPM × 128 ÷ Desired Dilution Ratio = oz/min
• See Unit Flow Rates chart for GPM
• Use 20 for 20:1 dilution ratio, 30 for 30:1, etc.
• Match calculated ounces per minute (oz/min) to nearest oz/min in Metering Tip Selection chart.

UNIT FLOW RATES

PSI	GPM
RINSE	FOAM
35	6.73
40	7.2
50	8.05
60	8.82
70	9.52
80	10.18
90	10.8
100	11.38
110	11.94
120	12.47
125	12.73

Troubleshooting Guide

Problem	Possible Cause / Solution
Startup	Maintenance
A) Foam surges and/or hose “bucks”.	1, 2, 3, 4, 6, 7, 8, 9, 10

1, 3, 4, 7, 8, 9
2, 3, 4, 6, 7, 8, 9, 10
1, 4, 6, 11
5| 12, 13, 14, 15, 16, 18, 19
12, 13, 14, 15, 16, 18, 19
13, 14, 15, 16, 18, 19
17
18
20
B) Foamer will not draw chemicals.
C) Foam too wet.
D) Foam does not clean properly (too dry).
E) Using too many chemicals.
F) Water/chemical backing up into airline.
G) Water backing up into a chemical container.
H) Air/chemical solution backing up into water line.

Possible Cause / Solution

Startup	Maintenance

1. Air pressure too high
• Adjust the air regulator slowly counterclockwise until output stabilizes.
2. Water pressure or water volume too low/inlet piping too small causing poor chemical to pick up
• Increase water pressure or water volume (SEE REQUIREMENTS).
3. Inlet, discharge ball valve not completely open, or chemical ball valve not open (2 & 3-Way)
• Completely open the inlet, discharge, and chemical ball valves.
4. Not enough chemical – metering tip too small
• Install larger metering tip.
5. No metering tip installed or metering tip too large
• Install smaller metering tip.
6. Improper chemical
• Ensure product is recommended for foaming and the application.
7. Chemical tube not immersed in chemical or depleted
• Immerse tube or replenish.
8. Discharge hose too long or wrong size or kinked
• Straighten the hose or replace the hose with the correct size and length.
• If the hose must be longer than the listed Requirement, water pressure must be 65 PSI or more for up to a 75′ hose.
9. Nozzle size too small
• Replace the nozzle with the correct size.
10. Use of an oiler in the airline will cause poor foam quality
• Use only clean, dry air.
11. Soil has hardened on the surface, rinse foam before it dries
• Reapplication may be necessary.| 12. Foamer inlet orifice clogged
• Check/clean inlet orifice for obstructions. DO NOT DRILL OUT. Install a water filter.
13. Chemical strainer or metering tip partially blocked
• Clean or replace chemical strainer and/or metering tip.
14. Chemical tube stretched out or pinhole/cut in chemical tube sucking air.
• Cut off the end of the tube or replace the tube.
15. Vacuum leak in chemical pick-up connections
• Tighten the connection.
16. Air regulator failed to allow too much air or not enough air
• Clean or replace.
17. Air check valve failed – Discharge ball valve left closed with inlet ball valves open
• Clean or replace.
18. Chemical check valve stuck or failed
• Clean or replace.
19. Hard water scale or chemical build-up may have formed in the foamer body causing poor or no chemical pick-up
• Follow Preventive Maintenance instructions below, using hot water or descaling acid. When there is no draw at all, carefully remove fittings and soak the entire body in descaling acid.
20. No backflow preventer installed and/or inlet ball valve left on when not in use
• Install appropriate backflow preventer into the waterline.

PREVENTIVE MAINTENANCE: When the unit will be out of service for extended periods, place a chemical tube(s) in water and flush the chemical out of the unit to help prevent chemicals from drying out and causing build-up. Periodically check and clean chemical strainer and replace if missing.