Lafferty Air Foamer Manual - Pumps & Pressure Inc.

LAFFERTY EQUIPMENT MANUFACTURING, INC.
Installation & Operation Instructions
REQUIREMENTS
Water:
Pressure range................. 400 to 1000 PSI
Temp. range................... Ambient to 160° F
Nozzle................A-20SS Airless Foam Wand
Hose:
I.D............................................... 3/8" ONLY
Length ................................................... 50'
OPTIONS
# 917905 A-20SS Airless Foamer Complete
— High Pressure Airless Foamer —
All Stainless Steel Accessories
• Hose Rack................................. # 224150
• Jug Racks
1 Gallon
Round..................................# 224200
Square.................................# 224205
2 ½ Gallon................................. # 224210
8 ½" x 10 ½"
(inside dimensions)
5 Gallon..................................... # 224215
12" x 12"
(inside dimensions)
www.LaffertyEquipment.com
501-851-2820
!Safety & Operation Notes
• Mounting: Mount unit above chemical supply to
prevent siphoning.
Personal Safety
• Wear protective clothing, gloves and eyewear when
working with chemicals.
• Always direct the discharge away from people and
electrical devices.
• Follow the chemical manufacturer’s safe handling
instructions.
• Regular equipment maintenance should include
checking all hoses, tubes, clamps and connections.
(See also, Preventive Maintenance, page 4.)
OPERATION
• Turn off water when unit is not in use.
• Do not substitute nozzle or hose sizes. (See
"Requirements.") The unit will not work properly
with other nozzles or hose sizes.
• To prevent streaking, apply foam from the bottom
and work up.
• Rinse the work surface before foam dries.
Lafferty Equipment Manufacturing, Inc. • 5614 Oak Grove Road • North Little Rock, Arkansas 72118

Model # 917905 A-20SS Airless Foamer Complete
Principles of Operation:
For use with 400-1000 PSI water systems, Lafferty High Pressure Airless Foamers
are water-driven venturi systems that will draw chemical concentrates from any
container, providing up to 21 different dilution ratios, and apply foam to any surface.
Foam is created instantly in the venturi airless foam wand.
TO INSTALL refer to diagram
Read all Safety and Operational Precautions on page 1.
1. Mount the unit above chemical supply to prevent siphoning.
2. Connect the discharge hose assembly as shown in the diagram.
3. Select and install metering tip into chemical check valve.
Push the chemical tube over the check valve and immerse the chemical strainer
into your chemical concentrate.
How to Select the Correct Metering Tip
• The dilution ratios provided in the Metering Tip Selection Chart, at right, are
based on water-thin chemical with a water pressure of 700 PSI. Use the
Metering Tip Selection Formula if you have water pressure other than 700
PSI.
• Due to varying chemical viscosities, you may need to increase the metering
tip size. (See chemical label for dilution recommendation.)
4. Connect water supply. (400 PSI water pressure minimum.)
TO FOAM
1. Open the water ball valve and move to the area to be cleaned.
• Hold the trigger gun firmly and direct the discharge in a safe direction.
• Pull the trigger and begin application. Observe foam quality.
• If foam quality is poor, keep trying the next larger sized metering tip until the foam
and cleaning results are acceptable.
2. When foaming is completed, release the trigger. Return to the unit and close the
inlet ball valve, then squeeze the trigger to relieve pressure in the hose. Rinse the
work surface before the chemical dries.
3. If Foamer will not be used for a period of time it is BEST to draw fresh water
thru the pick up tube to prevent chemical from drying inside the check valve or
Foamer body or Airless Foam Wand.
Metering Tip
Color
Metering Tip Selection
Oz.
per
Min.
Example:
Dilution Ratio
@ 700 PSI
A-20SS
Brown .84 500:1
Clear 1.16 362:1
Bright Purple 1.4 300:1
White 2.0 210:1
Pink 2.7 155:1
Corn Yellow 3.4 123:1
Dark Green 4.0 105:1
Orange 5.3 79:1
Gray 6.1 69:1
Light Green 7.0 60:1
Med. Green 8.5 49:1
Clear Pink 9.2 46:1
Yellow Green 11.2 37:1
Burgundy 12.5 34:1
Pale Pink 12.9 33:1
Light Blue 14.2 30:1
Dark Purple 17.6 24:1
Navy Blue 21.4 20:1
Clear Aqua 30.2 14:1
Black 40.4 10:1
No Tip — 8:1
The dilution ratios provided above are
approximate values. Your actual dilution
ratio may be higher or lower due to
variation in chemical viscosity.
Metering Tip Selection Formula
(GPM x 128)
÷
=
Dilution Ratio
Oz. per Min.
See chart below for
GPM and convert to oz.
per min.
20:1, 30:1, etc.
Match to nearest number
in chart above.
Water Flow Rate Chart
Water Pressure Water Flow Rate
PSI
GPM
A-20SS Airless Foamer
400 2.50
500 2.76
600 3.04
700 3.28
800 3.52
900 3.71
1000 3.90
! Always turn off water when unit is not in use.
– Page 2 –

Model # 917905 A-20SS Airless Foamer Complete
– Page 3 –

Troubleshooting Guide
Model # 917905 A-20SS Airless Foamer Complete
PROBLEM
Possible Cause / Solution Categories
Startup
Maintenance
A) Foamer will not draw chemical. 1, 4, 5, 6, 7 8, 9, 10, 11, 12, 13
B) Water backing up into chemical container. 8
C) Dilution too strong. 3
D) Foam does not clean/perform properly. 2
E) Chemical solution backing up into water line. 13
Possible Cause / Solution
Startup
1. Inlet ball valve or discharge ball valve not
completely open
• Completely open the water and discharge ball valves.
2. Not enough chemical - metering tip too small
• Install larger metering tip.
3. No metering tip installed or metering tip too large
• Install smaller metering tip.
4. Chemical tube not immersed in chemical or
chemical depleted
• Immerse tube or replenish.
5. Discharge hose too long or wrong size or kinked
(SEE REQUIREMENTS)
• Straighten the hose - Replace hose with correct size.
6. Foam wand wrong size (SEE REQUIREMENTS)
7. Water pressure too low or water volume too low/
inlet piping too small
• Increase water pressure or water volume (SEE
REQUIREMENTS).
Maintenance
8. Chemical check valve stuck or failed
• Clean or replace.
9. Chemical strainer or metering tip partially blocked
• Clean or replace chemical strainer and/or metering tip.
10. Chemical tube stretched out or pin hole/cut in chemical
tube (sucking air in)
• Cut off end of tube or replace tube.
11. Vacuum leak in chemical pick-up connection
• Tighten the connection.
12. Chemical build-up may have formed in the foamer body
or airless foam wand, causing poor or no chemical pickup
• Follow Preventive Maintenance instructions below, using hot
water and/or descaling acid. When there is no draw at all,
carefully remove fittings and soak entire body in descaling acid.
13. No backflow preventer installed
• Install appropriate backflow preventer into water line.
PREVENTIVE MAINTENANCE: When the unit will be out of service for extended periods, remove chemical tube from
chemical concentrate and place in water. Completely open the water and discharge ball valves for a few seconds to flush
chemical and help prevent chemical build-up. Check and/or clean chemical strainer; replace if missing.
03/04/09 – Page 4 –
917905_A-20SS_AF_Complete