
10093954
8/10
Package Should Contain:
1. Proportioner unit.
2. Supply tubing 28' total.
3. Foot valve assemblies
& weights (4).
4. Discharge tubing for
each eductor.
5. Metering tip kits.
6. Mounting anchor kit.
7. Hose hook for 3.5 GPM
eductor.
8. Instruction sheet.
Clip or
bend
these
tabs to
depress button
into locked
position.
Proportioner
Model 3974AG & 3975AG
with Airgap Eductors
Hydro Systems 3798 Round Bottom Road, Cincinnati, OH 45244 ▲ Phone: (513) 271-8800 ▲Fax: (513) 271-0160
Installation and Operation:
1. Remove cabinet cover. Install the short, whitish inner discharge tubes on the outlets of the eductors. They go over the smaller
barbed parts on the bottoms of the eductors. These tubes must be in place for the eductors to function. The inner discharge
tube for the 3.5 GPM (yellow) eductor has a yellow flooding ring inside it. The inner discharge tube for the 1.0 GPM (grey)
eductor has a grey flooding ring inside it. Install the end of the tube nearest the flooding ring on the eductor's inner discharge
barb. To ensure the IDTs are on correctly, see that the metal rings get positioned above the small barbs.
2. Find suitable place close to water source for unit. Mounting bracket should be installed approx. 5' from floor. Level bracket
& mark holes. Drill 9/32" holes & install mounting anchors and screws in bracket. Drill holes for the three wall anchors with a
5/16" drill bit, using the cabinet back as template for proper spacing of the mounting screws. Install mounting anchors, and
then screws in top two anchors. Slide key holes in cabinet back over screw heads, tighten screws, then install bottom screw.
Do not mount more than 6 feet (1.8 meters) above the bottom of the concentrate container, nor below the highest concentrate
level (never mount your concentrate higher than the proportioner).
3. Select metering tips (up to 4) for each selector valve. (see next two sections) Push each tip firmly into a separate hose barb
extending from the selector valve. A tip with no hole (clear plastic) can be used to block any valve port being used. (This may be
used for dispensing water only). Select and install a metering tip for the single product eductor (right side) in the same manner.
4. Cut tubing provided into separate supply tubes for each product to be dispensed (tubing allows 7 feet of tube per product).
Supply tubes should reach from hose barbs on the selector valve body and eductor to bottom of concentrate containers. Slide
ceramic weights over one end of each tube and slide foot valves into the same ends of the tubes.
5. Slip other end of supply tube through an opening in either side of the cabinet and push over the hose barb/metering tip on the
eductor. (Repeat for all eductors.)
6. Place foot valve ends of supply tubes into concentrate containers. REMEMBER TO CHECK FOOT VALVE STRAINERS
PERIODICALLY FOR CLOGGING: CLEAN IF NECESSARY.
7. A short discharge tube is used with the 1GPM eductor; minimum tube length is 8 inches (20cm) for proper operation. Longer
tubes (4 feet) are used with a 3.5 GPM eductor. Do not remove the flooding rings from inside the tubes. Slide end of tube
with flooding ring over eductor discharge outlet. (Repeat for all eductors.) Hooks may be installed on longer tubes to allow
discharge tube to conveniently hang from dispenser when not in use.
8. Replace cabinet cover. Push the sides in, behind the latch holes, to snap the cover in place. The two screws provided may be
installed in the holes in the cabinet sides to prevent easy removal of cover.
9. Connect water supply hose of at least 3/8 " ID to water inlet swivel. (Minimum 25 PSI pres-
sure, with water running, is required for proper operation.) Connect opposite end of hose
to water supply. Turn water supply on.
10. Push button to start flow of desired water/concentrate solution, and hold until supply tube
is primed (filled). Then push the button whenever dispensing is desired, and release button
to stop flow of solution. If you wish to be able to lock the button in the “on” position:
clip or bend the two tabs behind the lower front portion of the button (see diagram). This
allows the button to be fully depressed and allows it to latch in the “on” position. To unlock,
pull the button out.
Troubleshooting Chart:
* In hard water areas, scale may form inside the discharge end of the eductor, as well as in other areas of the unit that are exposed
to water. This scale may be removed by soaking the eductor in a descaling solution (deliming solution). To remove an eductor
located in the cabinet, rmly grasp water valve and unthread eductor. Replace in same manner. Alternatively, a scaled eductor can
be cleaned (or kept from scaling) by drawing the descaling solution through the unit. Operate the unit with the suction tube in the
descaling solution. Operate the unit until solution is drawn consistently, then ush the unit by drawing clear water through it for a
minute. Replace concentrate container and put suction tube into concentrate.
1. No discharge a. No water a. Open water supply
b. Magnetic valve not functioning b. Install valve parts kit
c. Eductor clogged c. Clean* or replace
d. Clogged water inlet strainer d. Disconnect inlet water line and clean s
strainer
2. No concentrate draw a. Clogged foot valve a. Clean or replace
b. Metering tip or eductor has b. Clean (descale)* or replace
scale build-up
c. Low water pressure c. Minimum 25 PSI (with water running)
required to operate unit properly
d. Discharge tube and/or ooding d. Push tube rmly onto eductor discharge
ring not in place hose barb, or replace tube if it doesn't
have a ooding ring.
e. Concentrate container empty e. Replace with full container
f. Inlet hose barb not screwed f. Tighten, but do not overtighten
into eductor tightly
g. Clogged water inlet strainer g. Disconnect inlet water line and clean
strainer
h. Air leak in chemical pick-up tube h. Put clamp on tube or replace tube if brittle
i. Selector out of position i. Assure selector is in position desired
3. Excess concentrate draw a. Metering tip not in place a. Press correct tip rmly into barb on
eductor
b. Chemical above eductor b. Place concentrate below the eductor
4. Failure of unit to turn o a. Water valve parts dirty or a. Clean* or replace with valve parts kit
defective
b. Magnet doesn't fully return b. Make sure magnet moves freely.
c. Push button stuck c. Remove button and clean cabinet/button
to remove any dirt lodged in slide recess
5. Excess foaming in discharge a. Air leak in pick-up tube a. Put clamp on tube or replace tube if brittle
SolutionCause
Problem
protective clothing and eyewear when dispensing chemicals or other materials or when working in the vicinity of all chemicals,
filling or emptying equipment, or changing metering tips.
observe safety and handling instructions of the chemical manufacturer.
direct discharge away from you or other persons or into approved containers.
dispense cleaners and chemicals in accordance with manufacturer's instructions. Exercise CAUTION when maintaining your
equipment.
reassemble equipment according to instruction procedures. Be sure all components are firmly screwed or latched into position.
only to tapwater outlets (85 PSI maximum)
equipment clean to maintain proper operation.
if the unit is used to fill a sink or discharge hose can be placed into a sink, the unit must be mounted so that the bottom of the
cabinet is above the overflow rim of the sink.
THANK YOU FOR YOUR INTEREST IN OUR PRODUCTS
WEAR
ALWAYS
KEEP
Please use this equipment carefully and observe all warnings andcautions.
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ATTACH
NOTE