Hydro 3874AG-2, 3875AG-2 Installation And Operation Manual

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, firmly 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 flush 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. Excessive water pressure c. Install regulator if water pressure exceeds

60 PSI (flowing)

d. Eductor clogged d. Clean* or replace

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 20 PSI (with water running)

required to operate unit properly

d. Discharge tube(s) not in place d. Push tube firmly onto eductor discharge

or flooding ring missing from hose barb; be sure inner discharge tube

inner discharge tube is installed and has flooding 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. Selector out of position h. Assure selector is in position desired

3. Excess concentrate draw a. Metering tip not in place a. Press correct tip firmly into barb on
eductor

b. Chemical above eductor b. Place concentrate below the eductor

4. Failure of unit to turn off 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
b. Inner discharge tube not in place b . Install inner discharge tube

6. Water discharge from air a. Restricted discharge hose a. Be sure discharge tube is not immersed,

vents on eductor kinked or elevated. Be sure there is no

liquid in the discharge tube when begin­ning to operate dispenser

b. High water pressure b. Install pressure regulator if flowing water

pressure exceeds 60 PSI (flowing)

SolutionCause

Problem

10082102

Rev. A 3/05

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. Drill holes for the three wall anchors with a 5/16" drill bit, using the cabinet back as a 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 the 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 color) can be used to block any valve port not being
used. (This may be used for dispensing water only.)

4. Cut tubing supplied for chemical inlet (¼" ID) into lengths required so that tubes will reach from barbs on selector valve
to bottoms of concentrate containers. For each inlet tube, slide a weight over one end and slip end over the barb on a foot
valve. Slide weight down to foot valve and attach opposite end of each tube over one of the hose barbs on the selector
valve.

5. Route tubes from each side through the notches in the cabinet.

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 a 1 GPM (grey) eductor – Model 3875AG-2 ; minimum tube length is 8 inches (20 cm)
for proper operation. A longer tube (4 feet) is used with a 3.5 GPM (yellow) eductor – Model 3874AG-2. Slide end of tube
over inner discharge tube and onto eductor discharge outlet. The hose hook supplied with Model 3874AG-2 may be
installed on the long tube to allow it 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 1/2" ID to water inlet swivel. (Minimum 20 PSI pressure, with water running, is
required for correct operation.) Connect opposite end of hose to water supply. Turn water supply on.

10. Purge air from the system by depressing the buttons briefly. There may be some water discharge from the eductor vents
until the air is purged.

11. 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. (Seediagram at right.) This allows the button to be fully depressed and allows
it to latch in the "on" position. To unlock, pull the button out.

12. It is essential that the discharge hose not be obstructed. If discharge is

restricted, water will flow out the eductor vents. Do not start to operate the
dispenser with liquid in the discharge tube.

THANK YOU FOR YOUR INTEREST IN OUR PRODUCTS

Please use this equipment carefully and observe all warnings and cautions.
****************************************************** NOTE ****************************************************

protective clothing and eyewear when dispensing chemicals or other materials.
observe safety and handling instructions of the chemical manufacturers.
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.
equipment clean to maintain proper operation.
protective clothing and eyewear when working in the vicinity of all

chemicals, filling or emptying equipment or changing metering tips.
re-assemble equipment according to instruction procedures. Be sure all

components are firmly screwed or latched into position.
only to tap water outlets (85 PSI maximum).

ALWAYS
ALWAYS
ALWAYS

WEAR

ALWAYS

WEAR

KEEP

ATTACH

AccuDose Series Proportioner

Models 3874AG-2 & 3875AG-2

with HydroGap

TM

Air Gap Eductors

Package Should Contain:

1. Proportioner unit.

2. Chemical inlet tubing .
3 Foot valves (4) and

weights (4).

3. Discharge tube.

4. Metering tip kit.

5. Mounting hardware.

6. Hook for discharge tube
(Model 3874AG-2 only).

7. Instruction sheet.

Hydro Systems 3798 Round Bottom Road, Cincinnati, OH 45244 ▲ Phone: [phone] ▲ Fax:[phone]

Clip or
bend
these
tabs to
depress
button
into locked
position.

1 GPM 3.5 GPMTip Color

APPROXIMATE DILUTIONS

AT 40 PSI FOR WATER-THIN PRODUCTS (1.0 CP)

Orifice Std. Drill
Size Number)

Ratio (per Eductor Flow)

No Tip .187 (3/16) 3:1 6.5:1
Grey .128 (30) 3:1 6.5:1
Black .098 (40) 3:1 7:1
Beige .070 (50) 4:1 10:1
Red .052 (55) 5:1 16:1
White .043 (57) 7:1 20:1
Blue .040 (60) 8:1 24:1
Tan .035 (65) 10:1 30:1
Green .028 (70) 16:1 45:1
Orange .025 (72) 20:1 56:1
Brown .023 (74) 24:1 64:1
Yellow .020 (76) 32:1 90:1
Aqua .018 (77) 38:1 128:1
Purple .014 (79) 64:1 180:1
Pink .010 (87) 128:1 350:1

Metering Tip Selection:

The final concentration of the dispensed solution is
related to both the size of the metering tip opening and
the viscosity of the liquid being siphoned. For water­thin products, the chart at left can be used as a
guideline. If product is noticeably thicker than water,
consult the Measurement of Concentration Procedure
below to achieve your desired water-to-product ratio.
Because dilution can vary with water temperature and
pressure, actual dilution achieved can only be ascer­tained by using the Measurement of Concentration
Procedure. The clear, undrilled tip is provided to permit
drilling to size not listed should you need a dilution ratio
that falls between standard tip sizes.

NOTE: A 1 GPM eductor is grey; a 3.5 GPM eductor is
yellow. Refer to parts diagram if unfamiliar with names
of system components.

Measurement of Concentration:

You can determine the dispensed water-to-product
ratio for any metering tip size and product viscosity. All
that is required is to operate the primed dispenser for
a minute or so and note two things: the amount of
dispensed solution, and the amount of concentrate
used in preparation of the solution dispensed. The water-to-product ratio is then calculated as follows:

Dilution Ratio (X:1) where X =

Amount of Mixed Solution — Amount of Concentrate Drawn

Amount of Concentrate Drawn
Dilution Ratio, then, equals X parts water to one part concentrate (X:1). If the test does not yield the desired ratio, choose
a different tip and repeat the test. Alternative methods to this test are 1) pH (using litmus paper), and 2) titration. Contact your
concentrate supplier for further information on these alternative methods and the materials required to perform them.

AccuDose Parts Diagram:

910

11a
11b

12a
12b

13a
13b

16

AccuDose Parts Diagram/List:

4

6 7

23 1

a

b

c

d

8

14

5

1 238100 Strainer washer
2 10082830 Swivel collar
3 10082811 Swivel stem

10075950 O-ring (stem /valve connection)
4 10075925 Pipe plug
5 10080710 Button, dark grey (standard)

10080711 Button, sky blue

10080712 Button, red

10080713 Button, green

10080714 Button, light grey

10080715 Button, yellow
6 10080894 Cabinet
7 10020700 Selector valve grommet

10020900 Back up ring for grommet

DescriptionPart No.Key

16

15

e

fg

Suction tube assembly
(materials for 4 provided):
attach open ends to barbs

on selector valve

18

19

17

8 10075980 Valve parts kit

a. diaphragm, b. armature,

c. spring, d. valve bonnet
9 10079010 Spring
10 10079000 Magnet
11 a 160 1 GPM Eductor kit (grey)

b 161 3.5 GPM Eductor kit (yellow)

Kits include inner and outer

discharge tubes
12 a 10070170 1 GPM inner discharge tube

b 10070470 3.5 GPM inner discharge tube

13 a 10064794 1 GPM outer discharge tube

b 10077310 3.5 GPM outer discharge tube

14* 10080720 Hose hook, dark grey (std)

10080721 Hose hook, sky blue
10080722 Hose hook, red
10080723 Hose hook, green
10080724 Hose hook, light grey
10080725 Hose hook, yellow

* Hose hook provided with

Model 3874AG-2 only
15 10080920 Selector valve replacement kit:

e. Suction stub, f. O-ring,

g. selector valve assembly
16 690014 Metering tip (kit)
17 500870 Tubing, ¼" x 7'
18 509900 Weight
19 10089410 Foot valve -- Viton (EPDM also

available. Order 10076302.)
NOT SHOWN:

641751 Security screws (cabinet sides)

DescriptionPart No.Key