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Troubleshooting Guide:
Problem
Cause
1. No discharge
a. No water
b. Excessive water pressure
c. Eductor clogged
2. No concentrate draw
a. Clogged check valve
b. Metering tip clogged
c. Eductor clogged
d. Clogged water inlet
e. Clogged foot strainer
f. Low water pressure and/or
volume
g. Concentrate container empty
h. Check valve not screwed into
eductor firmly
3. Excess concentrate draw
a. Metering tip not in place
(Or wrong metering tip)
4. Water flow won't shut off
a. Ball valve defective
5. Leaks at plastic tube
a. Compression nut loose
6. Low or no water flow
a. Inlet screen clogged
b. Supply source inadequate
c. Scaled eductor or fittings
7. Backflow into concentrate
a. Eductor check valve inoperable
* In hard water areas, scale (mineral deposits) may form at the discharge of the eductor. This scale may be
removed by soaking the eductor in a descaling (deliming) solution or by running the descalant through the
system. When removing an eductor for soaking, firmly grasp the eductor and unthread the adapters located
above and below the eductor. Replace in the same manner.
Hydro Systems 3798 Round Bottom Road, Cincinnati, OH 45244 s Phone: (513) 271-8800 s Fax:(513) 271-0160
Solution
a. Open water supply
b. Install regulator if pressure
exceeds 85 PSI
c. Clean* or replace
a. Clean or replace
b. Rinse in hot water or replace:
DO NOT REAM CLEAN!
c. Clean or replace
d. Clean screen
e. Clean or replace
f. Minimum 25 PSI and 4 GPM
flow required to operate unit
g. Replace with full container
h. Tighten, but DO NOT OVER
TIGHTEN!
a. Press correct tip firmly into barb
a. Replace
a. Tighten nut 1/2 turn
a. Clean or replace
b. 4 GPM flow necessary to unit.
Move unit or replumb incoming
line.
c. Clean* or replace
a. Clean or replace check valve
10084408
REV. A 1/04
HydroChem Model 918
Multifunction Proportioning and Dispensing System
Wall mounted, high volume washing or foaming proportioner with one product eductor.
THANK YOU FOR YOUR INTEREST IN OUR PRODUCTS
Hydro Systems manufactures quality proportioning and dispensing equipment. Please use this equipment carefully and
observe all warnings and cautions.
************************************************************ NOTE ********************************************************
WEAR
protective clothing and eyewear when dispensing chemicals or other materials.
ALWAYS
observe safety and handling instructions of the chemical manufacturers.
ALWAYS
direct discharge away from you or other persons or into approved containers.
ALWAYS
dispense cleaners and chemicals in accordance with manufacturer's instructions. Exercise
CAUTION when maintaining your equipment.
CLEAN
equipment after each use in accordance with instruction sheet.
WEAR
protective clothing and eyewear when working in the vicinity of all chemicals, filling or emptying
equipment or changing metering tips.
ALWAYS
re-assemble equipment according to instruction procedures. Be sure all components are firmly
screwed or latched into position.
ATTACH
only to tap water outlets (85 PSI maximum).
Package includes:
-- complete unit mounted on stainless steel front plate
-- (1) 7-foot vinyl product suction tube with foot strainer
-- (1) metering tip kit
-- (4) screws and (4) wall anchors for wall mounting (use 9/32" drill)
-- parts list and product structure diagram
Instructions for Operation:
1. Attach unit to wall using hardware provided.
2. Select metering tip (see section on metering tip selection) and press firmly into hose barb provided at the side
of the eductor. Install product suction tube on hose barb. The strainer end of the suction tube can be dropped
directly into the concentrate container.
3. Connect water inlet hose with 3/4" male garden thread to female swivel at top left side of unit. Tighten to avoid
leaking.
4. Connect discharge hose to male 3/4" discharge provided at bottom of unit. Hose of 1/2" ID is recommended
if the hose length will be 50 feet or less. Use 3/4" ID hose if the total length of the hose will exceed 50 feet.
5. Turn on water supply to unit. Minimum 25 PSI water pressure is required to operate the unit.
6. Turn on product valve to begin proportioning and dispensing. Shut off the valve and turn on rinse (right) lever
for full volume rinse. Note: You may only use either the product or the rinse feature - only one valve may be in
use at a time.
Metering Tip Selection:
The final concentration of the dispensed solution is related to several factors in the application, such as viscosity
of the product, length and diameter of the discharge hose, water pressure, water flow rate, water temperature, hose
end attachments used, etc. A chart is provided on the next page which can be used as a guideline for selecting a
metering tip when proportioning water-thin concentrates. Test the actually achieved dilution using the Measure-
ment of Concentration procedure discussed on the next page. If product viscosity is greater than that of water,
choose a tip with a larger orifice than that which would deliver the desired water-to-product ratio for a water-thin
product. Test the actually achieved ratio using the Measurement of Concentration procedure on the next page.
Continue to choose and test tips until the desired dilution is achieved. A clear, undrilled tip is supplied to permit
drilling an orifice size not listed, if necessary.