DEMA® MODEL 693T FOAM STATION II
INSTALLATION INSTRUCTION
I-747
Page 4 of 8
Rev. E-40261
11/13/14
5.
SERVICING:
CAUTION: TURN OFF WATER SUPPLY BEFORE SERVICING
.
WHEN SERVICING UNIT, BE SURE THAT
REPLACEMENT PARTS HAVE BEEN INSTALLED ACCORDING TO DRAWING. BE 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, 17
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
POSSIBLE SITUATIONS
Situation Cause
Solution
1
Chemical tube not immersed in chemical
or chemical depleted.
Immerse tube in chemical or replace.
2
Air pressure is too high for water.
Adjust air regulator down.
3
Water pressure is too low.
At least 30 psi is required. Increase if possible, or decrease air pressure.
4
Chemical to water ratio is too low.
Change metering tip to one that is larger.
5
Foam hose is kinked.
Straighten hose.
6
Foam hose is too long or wrong size.
See Table 1.
7
Air supply is inadequate.
Increase air pressure by regulating up.
8
Detergent is wrong.
Use a more effective detergent, and be sure that product is
recommended for foaming.
9
Using an oiler on the airline may
deteriorate the quality of the foam.
Use only clean, dry air.
10
Holes or cuts are in chemical inlet tube.
Replace the tube.
11
Strainer and/or metering tip are blocked.
Remove, clean or replace.
12
Solution check valve is not working.
Remove, clean or replace.
13
Air regulator is not working.
Remove, clean or replace.
14
Soil has hardened on surface.
Reapplication may be necessary. Be sure to rinse foam off before it
dries.
15
Rust or build-up is clogging the foamer
aspirator.
Disconnect water from unit and remove injector from unit. Visually
inspect. Remove blockage.
16
Water scale or chemical build-up may
have formed in the water jets.
Place the chemical tube in descaling acid and completely open the shut-
off valve. Let unit run until the chemical tube is filled with acid, then
close 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.
17
More than one valve is open.
Close the rinse valve and the injector valve that is not in use.
