Dema 681AG-3 Installation Manual

DEMA 681AG-3 BLEND CENTER

INSTALLATION INSTRUCTIONS

1. PARTS:

A. Blend center assembly. B. 3 – ¼”ID/3/8"ID x 8f t. long vinyl tubing, foot valve, ceramic weight.
C. 1 pc. 9/16" I.D. x 20 ft. long vinyl outlet tubing. D. 2 pcs. #8 pan head 3/4" long mounting screws & anchors.
E. 1 pc. label card. F. Metering tip kit.

2. INSTALLATION:

Note: All installations must conform to local plumbing codes and use approved backflow preventers.

Pressure indicating tee is to be installed with existing faucets according to local plumbing codes in the state of Wiscons in
and any other state that requires the use of a pressure indicating tee.

A. Mounting and water supply :

Remove Blend Center lid and hold unit in position to locate the mounting screw positions. Install the mounting screws; leaving
approximately 1/8" extension between the wall and screw head. Mount the Blend Center by inserting the screw heads through the
key hole slots in the base and tighten the screws (See Figure 1).
The water inlet is equipped with a female garden hose fitting (with strainer washer) for attaching a water supply hose. The fitting
may be removed to permit direct connection to a 3/8" NPT pipe. The unit is designed so water can be supplied to either side by
interchanging the pipe plug and the f emale hose fitting. Note: Apply pipe dope, hand tighten, and then tur n 12 times with a

wrench. DO NOT OVER TIGHTEN.

B. Pressure Indicating Tee Installation:

Screw female quick disconnect to faucet and attach pressure indicating tee to female quick disconnect. Attach female end of
reinforced hose to male threads of tee, then attach the male end to the f emale garden hose f itting at the w ater inlet of the Bl en d Ce nt er
(See Figure 3). Water supply should not exceed 125 psi and water temperature must not exceed 160°F.

C. Chemical supply:

Place the chemical containers in a conveni ent location no t more than 6 feet below the blend cent er (greater lift s wi ll re du ce in je ct io n
capacities) . Insert the vinyl supply tubing with the foot valve ends into the chemical containers. Cut the vinyl tubes to any
convenient length that will allow them to extend from the bottom of the chemical container to the proportioner inlet barbs. (See
Figure 1) Gummed labels are provided for product labeling.

D. Outlet:

Cut the 9/16" I.D. outlet tubing to the desired lengths and attach them to the proportioner outlets. Longer lengths may be u sed up to
10 feet. The 7" long tubing must be left on the 1 GPM proportioner to insure priming.

E. Chemical injection adjustment:

Chemical f eed rates are controlled by metering ti ps screwed into the proportioner barbs. Select a tip for each barb using T abl e 1 o r
2 as a guide.

Note: 1 cps (centipoise) is equal to the viscosity of water, 75 cps is approximately equal to the viscosity of 10 weight motor
oil, and 200 cps is approximately equal to the viscosity of most dishwashing detergents.

WARNING: USE CARE WHEN HANDLING HAZARDOUS CHEMICALS.

3. OPERATION:

The Blend Cente r is now ready for use. Depressi ng a push b utton opens the valve, allowing water to flow through the chemical
proportioner that mixes chemical at the desired rate. The buttons are spring loaded to prevent accidental overflow if unattended , bu t may
be converted to locking buttons by cutting of f the tab at the notch. (See Figure 2) Pushing the button and tubing it 1/4 turn clockwise at
the end of its travel allows the valve to lock on. This makes it unnecess ar y for the attendant to hold the button in while filling large
containers. Turning the button in a counter clockwise direction will release it, allowing the valve to shut off.

4. SERVICING: CAUTION: TURN OF F WATER SUPPLY BEFORE SERVICING.

A. Proportioner fails to draw chemical:

1. Pinch outlet tube to create back pressure which will cause unit to prime. The foot valve will keep the inlet tube primed.

2. Insufficient water supply p ressure. 2 0 PSI is the minimum allowable.

B. Proportioner stops drawing chemical:

1. Inspect foot valve for dried chemical or dirt. Soak in hot water to clean.

2. Propor tioner metering tip clogged with dried chemical. Remove tip and try injecting hot water to clear interior passa ges.

C. Propor tioner continues to draw chemical after water valve closes:

I-458 Pg. 1 of 6
Rev. C-36452 1/5/ 11

DEMA 681AG-3 BLEND CENTER

INSTALLATION INSTRUCTIONS

Chemical supply is higher than bottom of discharge tube creating a natural siphon. Lower the chemical supply or hang up outlet
tubing after use.

D. Valve malfunction:

Check that the button moves freely up & down and that a "click" can be heard when the button is pushed and released, indicating
that the magnet is activating the plunger properly. Remove cover. To inspect internal parts, unscrew magnet housing and ca ref ul ly
pull off the enclosing tube so as not to drop the plunger, kick-off spring, and spacer. Check for dirt of damage impending plunger
and kick-off spr ing movement. Inspect the diaphragm, making sure the two small p in holes (bleed holes ) in the diaphragm
convolution are clear to allow the valve to close.

CAUTION: When servicing unit, be sure that replacement parts have been installed according to drawing.

TABLE 1 - 164 BAG (1 GPM FLOW RATE PROPORTIONER - 1/4" BARB AND TUBING)

Metering Tip

Color

oz/gal ml/l Ratio oz/gal ml/l Ratio oz/gal ml/l Ratio

Tan 1.25 9.76 102-1 0.90 7.03 142-1 0.60 4.69 213-1
Orange 1.70 13.28 75-1 1.20 9.37 107-1 0.80 6.25 160-1
Turquoise 2.15 16.80 60-1 1.55 12.11 83-1 1.10 8.59 116-1
Pink 3.00 23.44 43-1 2.00 15.62 64-1 1.50 11.72 85-1
Light Blue* 3.90 30.47 33-1 2.75 21.48 47-1 1.80 14.06 71-1
Brown 4.55 35.55 28-1 3.00 23.44 43-1 2.00 15.62 64-1
Red 5.80 45.31 22-1 3.60 28.12 36-1 2.30 17.97 56-1
White 7.00 54.69 18-1 4.45 34.76 29-1 2.70 21.09 47-1
Green 7.90 61.72 16-1 5.00 39.06 26-1 3.00 23.44 43-1
Blue 9.80 76.56 13-1 5.75 44.92 22-1 3.30 25.78 39-1
Yellow 14.80 115.62 9-1 7.35 57.42 17-1 3.55 27.73 36-1
Black 20.15 157.42 6-1 8.50 66.40 15-1 3.70 28.91 35-1
Purple 27.80 217.20 5-1 9.80 76.56 13-1 3.80 29.69 34-1
Gray 31.60 246.87 4-1 10.50 82.03 12-1 3.90 30.47 33-1
No Tip 35.70 278.90 3.6-1 11.80 92.19 11-1 4.50 35.16 28-1

*Metering tip color was formerly clear. Note: All induction rates are base on a water pressure of 40 psi.

Leaner dilutions can be achieved by o rdering DEMA ultra lean metering tip kit 100-15KU.

1 cps 75 cps 200 cps

Injection Rates For Viscosities Shown

TABLE 2 - 164 AG (1 GPM FL OW RATE PROPORTIONER - 3/8" BARB AND TUBING)

Metering Tip

Color

oz/gal ml/l Ratio oz/gal ml/l Ratio oz/gal ml/l Ratio

Clear 1.40 10.94 91-1 1.00 7.81 128-1 0.85 6.64 151-1
Purple 2.15 16.80 60-1 1.75 13.67 73-1 1.40 10.94 91-1
Yellow 4.00 31.25 32-1 3.25 25.39 39-1 2.80 21.87 46-1
Green 6.70 52.34 19-1 5.40 42.19 24-1 4.50 35.16 28-1
Pink 8.70 67.97 15-1 7.00 54.69 18-1 5.60 43.75 23-1
Turquoise 14.15 110.54 9-1 11.15 87.11 11-1 8.15 63.67 16-1
Black 17.25 134.76 7-1 13.50 105.47 9-1 10.00 78.12 13-1
Gray 22.60 176.56 6-1 16.75 130.86 8-1 11.60 90.62 11-1
Red 25.15 196.48 5-1 19.50 152.34 7-1 13.50 105.47 9.5-1
Blue 27.50 214.84 4.7-1 21.65 169.14 6-1 14.25 111.33 9-1
Brown 31.00 242.18 4-1 24.25 189.45 5-1 15.60 121.87 8-1
White 33.50 261.71 3.8-1 26.25 205.07 4.9-1 16.70 130.47 7.7-1
Orange 35.40 276.56 3.6-1 28.00 218.75 4.6-1 17.40 135.93 7.4-1
Lt. Blue* 36.50 285.15 3.5-1 29.00 226.56 4.4-1 18.20 142.18 7-1
Tan* 37.80 295.31 3.4-1 29.90 233.59 4.3-1 18.65 145.70 6.9-1
No Tip 38.30 299.21 3.3-1 30.90 241.40 4.1-1 21.30 166.40 6-1

Note: All induction rates are base on a water pressure of 40 psi. *These tips are not included in standard tip kit.

I-458 Pg. 2 of 6
Rev. C-36452 1/5/ 11

1 cps 75 cps 200 cps

Injection Rates For Viscosities Shown

DEMA 681AG-3 BLEND CENTER

INSTALLATION INSTRUCTIONS

TABLE 3 - 163 AG (4 GPM FL OW RATE PROPORTIONER - 1/4" BARB AND TUBING)

Metering Tip

Color

oz/gal ml/l Ratio oz/gal ml/l Ratio oz/gal ml/l Ratio

Tan 0.30 2.34 427-1 0.20 1.56 640-1 0.15 1.17 853-1
Orange 0.40 3.12 320-1 0.30 2.34 427-1 0.25 1.95 512-1
Turquoise 0.60 4.69 213-1 0.40 3.12 320-1 0.30 2.34 427-1
Pink 0.80 6.25 160-1 0.50 3.91 256-1 0.40 3.12 320-1
Light Blue* 1.00 7.81 128-1 0.70 5.47 183-1 0.45 3.51 284-1
Brown 1.20 9.37 107-1 0.80 6.25 160-1 0.50 3.91 256-1
Red 1.50 11.72 85-1 0.90 7.03 142-1 0.60 4.69 213-1
White 1.85 14.45 69-1 1.10 8.59 116-1 0.70 5.47 183-1
Green 2.00 15.62 64-1 1.25 9.76 102-1 0.80 6.25 160-1
Blue 2.50 19.53 51-1 1.50 11.72 85-1 0.82 6.41 156-1
Yellow 4.00 31.25 32-1 1.85 14.45 69-1 0.90 7.03 142-1
Black 5.50 42.97 23-1 2.00 15.62 64-1 0.94 7.34 136-1
Purple 8.80 68.75 15-1 2.40 18.75 53-1 0.96 7.50 133-1
Gray 11.65 91.01 11-1 2.50 19.53 51-1 1.00 7.81 128-1
No Tip 16.20 126.56 8-1 3.00 23.44 43-1 1.20 9.37 107-1

TABLE 4 - 163 AG (4 GPM FL OW RATE PROPORTIONER - 3/8" BARB AND TUBING)

Metering Tip

Color

oz/gal ml/l Ratio oz/gal ml/l Ratio oz/gal ml/l Ratio

Clear 0.90 7.03 142-1 0.30 2.34 427-1 0.20 1.56 640-1
Purple 1.10 8.59 116-1 0.50 3.90 256-1 0.40 3.12 320-1
Yellow 1.80 14.06 71-1 1.00 7.81 128-1 0.70 5.47 183-1
Green 2.50 19.53 51-1 1.50 11.72 85-1 1.20 9.37 107-1
Pink 3.00 23.44 43-1 2.00 15.62 64-1 1.50 11.72 85-1
Turquoise 4.50 35.16 28-1 3.15 24.61 41-1 2.30 17.97 56-1
Black 4.80 37.50 27-1 3.75 29.30 34-1 2.80 21.87 46-1
Gray 6.70 52.34 19-1 4.80 37.50 27-1 3.35 26.17 38-1
Red 8.15 63.67 16-1 5.80 45.31 22-1 3.80 29.69 34-1
Blue 9.20 71.87 14-1 6.60 51.56 19-1 4.20 32.81 30-1
Brown 11.10 86.72 12-1 7.75 60.55 17-1 4.70 36.72 27-1
White 13.20 103.12 10-1 9.15 71.48 14-1 5.00 39.06 26-1
Orange 15.00 117.19 9-1 10.10 78.90 13-1 5.30 41.41 24-1
Lt. Blue* 16.70 130.47 8-1 11.10 86.72 12-1 5.50 42.94 23-1
Tan* 18.50 144.53 7-1 11.80 92.19 11-1 5.80 45.31 22-1
No Tip 19.40 151.56 6.6-1 13.00 101.56 10-1 6.20 48.44 21-1

Note: All induction rates are base on a water pressure of 40 psi. *These tips are not included in standard tip kit. Leaner

dilutions can be achieved by ordering DEMA ultra lean metering tip ki t 100-15KU.

1 cps 75 cps 200 cps

1 cps 75 cps 200 cps

Injection Rates For Viscosities Shown

Injection Rates For Viscosities Shown

RETURNS: NO MERC HANDISE MAY BE RETURNED FOR CREDIT W ITHOUT DEMA’S WRITTEN PERMI SSION.

RETURN MERCH ANDISE AUTHORIZATION NUMBER REQUI RED IN ADVANCE OF RETURN.

WARRANTY: DEMA p roducts are warranted against defective material and workmanship under normal use and service for one year

from the date of manufacture. This limited warranty does not apply to any products which have a normal life shorter
than one year or failure and damage caused by chemicals, corrosion, improper voltage supply, physical abuse, or
misapplication. Rubber and synthetic rubber parts such as “O”- rings, diaphragms, squeeze tubing and gaskets are
considered expendable and are not covered under warranty. This warranty is extended only to the original buyer of
DEMA products. If products are altered or repaired without prior approval of DEMA, this warranty will be void.
Defective units or parts should be returned to the factory with transportation prepaid. If inspection shows them to be
defective, they will be repaired or replaced without charge, F.O.B. factory. DEMA assumes no liability for damages.
Return merchandise authorization number, to return units for repair or replacement, must be granted in advance of
return.

I-458 Pg. 3 of 6
Rev. C-36452 1/5/ 11

DEMA 681AG-3 BLEND CENTER

INSTALLATION INSTRUCTIONS

PIPE PLUG & O-RING

PUSH BUTTON ACTUATOR

CLOSE NIPP LE

7" LG TUBING

(MODEL 164AG ONLY)

ADAPTER

INLET HOSE ADAPTOR

MOUNTING HOLES

AIR GAP PROPORTIONER

METERING TIP

STRAI NER WASHER

SUPPLY TUBING

TO CHEMICAL

VINYL DISCHARGE TUBING

PUSH BUTTON

KNIFE

FIGURE 1

CHEMICAL CONTAINER

CERAMIC WEIGHT

FOOT VALVE

FIGURE 2

I-458 Pg. 4 of 6
Rev. C-36452 1/5/ 11

DEMA 681AG-3 BLEND CENTER

INSTALLATION INSTRUCTIONS

PRESSURE INDICATING TEE INSTALLATION

BLEND CENTER

WATER INLET HOSE

OUTLET TUBING

PRESSURE

INDICATING

TEE

CHEMICAL
INLET TUBING

WATER INLET HOSE

DETAIL OF PRESSURE

INDICATING TEE

FIGURE 3

I-458 Pg. 5 of 6
Rev. C-36452 1/5/ 11

DEMA 681AG-3 BLEND CENTER

INSTALLATION INSTRUCTIONS

NO. PART NO. DESCRIPTION

1 66-139 MAGNET HOUSING
2 66-140 PUSH BUTTON
3 63-35 MAGNET
4 63-36 SPRING
5 41-7-25 ENCLOSING TUBE
6 63-87 VALVE REPAIR KIT
7 63-37 SPACER
8 41-1-8 KICKOFF SPRING
9 63-38 PLUNGER
10 41-15-10 DIAPHRAGM, EP
11 63-39 VALVE BODY
12 100-38 STRAINER WASHER
13 93-44 PIPE TO GARDEN HOSE

ADAPTOR
14 66-31 CLOSE NIPPLE
15 66-153 PIPE PLUG ASSY
16 16-30 ACTION GAP ASSY
17 61-22GAP-2 4 GPM PROPORTIONER (WHITE)
18 61-99GAP-2 1 GPM PROPORTIONER (GREEN)

NO. PART NO DESCRIPTION

19 61-21 ½” ID X 6’ LONG VINYL OUTLET

TUBE (4 GPM)

20 16-3-6 1/3” ID X 6’ LONG VINYL

OUTLET TUBE (1 GPM)
21 63-78 O-RING EP
22 63-79 INLET BARB (1/4”)
23 63-80 INLET BARB (3/8”)
24 100-15K METERING TIP KIT (1/4” BARB)
25 61-9K METERING TIP KIT (3/8” BARB)
26 100-12 ¼” I D X 8’ LONG VINYL SUPPLY

TUBING
27 61-107-2 CERAMIC WEIGHT FOR ¼”

TUBING
28 61-107 CERAMIC WEIGHT FOR 3/8”

TUBING
29 100-16E-1 FOOT VAL VE
30 68-6-QD2 PRESSURE INDICATING TEE
31 61-25-2 FRESH WATER OUTLET KIT

I-458 Pg. 6 of 6
Rev. C-36452 1/5/ 11