Hydro 3874GB-2,3875GB-2 User Manual
Installation and Operation:
1. Remove cabinet cover. Drill holes for the three wall anchors with a 7mm drill bit, using the cabinet back as a template
for correct 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
1.8 metres above the bottom of the concentrate container, nor below the highest concentrate level (never mount
concentrate higher than the proportioner).
2. 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) can be used to block any valve
port not being used. (This may be used for dispensing water only.)
3. Cut tubing supplied for chemical inlet (6mm ID) into lengths required so that tubes will reach from barbs on selector
valve to bottom 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.
4. Push tubes from each side through the notches in the cabinet.
5. Place foot valve end of supply tubes into concentrate containers. REMEMBER TO CHECK FOOT VALVE
STRAINERS PERIODICALLY FOR CLOGGING: CLEAN IF NECESSARY.
6. A short discharge tube is used with a 4 LPM (grey) eductor – Model 3875GB-2 ; minimum tube length is 20 cm
for correct operation. A longer tube (1.2 m) is used with a 16 LPM (yellow) eductor – Model 3874GB-2. Slide
end of tube over eductor discharge outlet. The hose hook supplied with Model 3874GB-2 may be installed on the
long tube to allow it to hang from dispenser when not in use.
7. 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.
8. Connect water supply hose of at least 13mm ID to water inlet swivel. (Minimum 1.76 Bar pressure, with water
running, is required for correct operation.) Connect opposite end of hose to water supply. Turn water supply on.
9. Purge air from the system by depressing the buttons briefly.
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 below.) This allows the button to be fully depressed and allows it to latch in the "on" position. TO UNLOCK
PULL BUTTON OUT.
AccuDose Series Proportioner
Models 3874GB-2 & 3875GB-2
Package Contains:
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 3874GB-2 only).
7. Instruction sheet.
Clip or
bend
these
tabs to
depress
button
into locked
position.
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 water-thin products, the chart at
right 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 4 LPM eductor is grey; a 16 LPM 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:
4
6
7
23 1
5
1 238100 Strainer washer
2 10082835 Swivel collar
3 10082816 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
No Tip .187 (3/16) 2:1 3:1
Grey .128 (30) 2:1 3:1
Black .098 (40) 2:1 4:1
Beige .070 (50) 3:1 8:1
Red .052 (55) 4:1 14:1
White .043 (57) 5:1 20:1
Blue .040 (60) 6:1 24:1
Tan .035 (65) 8:1 30:1
Green .028 (70) 12:1 45:1
Orange .025 (72) 16:1 56:1
Brown .023 (74) 18:1 64:1
Yellow .020 (76) 24:1 90:1
Aqua .018 (77) 32:1 128:1
Purple .014 (79) 45:1 180:1
Pink .010 (87) 128:1 350:1
Ratio (per Eductor Flow)
16 LPM
Tip Color
APPROXIMATE DILUTIONS
AT 2.86 BAR FOR WATER-THIN PRODUCTS (1.0 CP)
Orifice Std. Drill
Size Number
4 LPM
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