Page 1
DEMA MODEL 681AG-2P
BLEND CENTER
INSTALLATION INSTRUCTIONS
I PARTS
A. Blend Center Assembly
B. 2 pcs. ¼" I.D. or 3/8” I.D. x 8 ft. long vinyl supply tubing, foot valve, and ceramic weight
C. 1 pc. 9/16” I.D. x 10 ft. long vinyl outlet tubing
D. 2 pcs. #8 pan head, 1 ¾” long mounting screws & anchors
E. 1 pc. label card
F. Metering Tip Kit
II INSTALLATION
Note: All installations must conform with local plumbing codes and use approved backflow preventers.
A. Mounting and water supply:
Remove the cover retaining screws and the cover from the blend center assembly. Mount the unit in position on the wall
and locate t he pos it ion for t he two s crews in t he outer mos t holes in t he valve bodies. Mount the unit t o the wall and
replace the cover and screws.
The water inlet is equipped with a female garden hose fitting (with strainer washer) for attachi ng a w ate r su pply h ose . Th e
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 female hose fitting. Note: Apply pipe dope, hand tighten, and then turn
1 ½ times with a wrench. DO NOT OVER TIGHTEN.
B. Chemical supply:
Place the chemical containers in a convenient location not more than 6 feet below the blend center (greater li fts w i ll re duc e
injection capabilities). 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 then to extend from the bottom of the chemical contai ne r to the pro porti on er
inlet barbs. (See Figure 1). Gummed labels are provided for product labeling.
C. Outlet:
Cut the 9/16” I.D. outlet tubing to the desired lengths and attach them to the proportioner outlets. Longer lengths may be
used up to 10 feet. The 7’ long 3/16” I.D. tubing must be left on the 1 GPM proportioner to insure priming.
D. Chemical injection adjustment:
WARNING: USE CARE WHEN HANDLING HAZARDOUS CHEMICALS.
Chemical feed rates are controlled by metering tips screwed into the proportioners barbs. Select a tip for each barb using
Tables 1 and 2 as a guide.
Note: 1 cps (centipoise) is equal to the viscosity of water, 75 cps is approximately equal to th e viscosity of 10 weight
motor oil, and 200 cps is approximately equal to th e viscosity of most dishwashing detergents.
I-582 Pg. 1 of 6
Rev. A-0600
Page 2
DEMA MODEL 681AG-2P
BLEND CENTER
INSTALLATION INSTRUCTIONS
Table 1
164BAG (1 GPM FLOW RATE PROPOR TIONER – ¼" BARB AND TUBING)
Injection Rates For Viscosities Shown
Metering Tip Color
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
Tan 1.25 102 : 1 0. 90 142 : 1 0.60 213 : 1
Orange 1.70 75 : 1 1.20 107 : 1 0.80 160 : 1
Turquoise 2.15 60 : 1 1.55 83 : 1 1.10 116 : 1
Pink 3.00 43 : 1 2.00 64 : 1 1.50 85 : 1
Clear 3.90 33 : 1 2.75 47 : 1 1.80 71 : 1
Brown 4.55 28 : 1 3.00 43 : 1 2.00 64 : 1
Red 5.80 22 : 1 3.60 36 : 1 2.30 56 : 1
White 7.00 18 : 1 4.45 29 : 1 2.70 47 : 1
Green 7.90 16 : 1 5.00 26 : 1 3.00 43 : 1
Blue 9.80 13 : 1 5.75 22 : 1 3.30 39 : 1
Yellow 14.80 9 : 1 7.35 17 : 1 3.55 36 : 1
Black 20.15 6 : 1 8.50 15 : 1 3.70 35 : 1
Purple 27.80 5 : 1 9.80 13 : 1 3.80 34 : 1
Gray 31.60 4 : 1 10.50 12 : 1 3.90 33 : 1
No Tip 35.70 3.6 : 1 11.80 11 : 1 4.50 28 : 1
1 cps 75 cps 200 cps
Table 2
164AG (1 GPM FLOW RATE PROPOR TIONER – 3/8" BARB AND TUBING)
Injection Rates For Viscosities Shown
Metering Tip Color
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
Clear 1.40 91 : 1 1.00 128 : 1 0.85 151 : 1
Purple 2.15 60 : 1 1.75 73 : 1 1.40 91 : 1
Yellow 4.00 32 : 1 3.25 39 : 1 2.80 46 : 1
Green 6.70 19 : 1 5.40 24 : 1 4.50 28 : 1
Pink 8.70 15 : 1 7.00 18 : 1 5.60 23 : 1
Turquoise 14.15 9 : 1 11.15 11 : 1 8.15 16 : 1
Black 17.25 7 : 1 13.50 9 : 1 10.00 13 : 1
Gray 22.60 6 : 1 16.75 8 : 1 11.60 11 : 1
Red 25.15 5 : 1 19.50 7 : 1 13.50 10 : 1
Blue 27.50 4.7 : 1 21.65 6 : 1 14.25 9 : 1
Brown 31.00 4 : 1 24.25 5 : 1 15.60 8 : 1
White 33.50 3.8 : 1 26.25 4.9 : 1 16.70 7.7 : 1
Orange 35.40 3.6 : 1 28.00 4.6 : 1 17.40 7.4 : 1
Lt. Blue 36.50 3.5 : 1 29.00 4.4 : 1 18.20 7 : 1
Tan 37.80 3.4 : 1 29.90 4.3 : 1 18.65 6.9 : 1
No Tip 38.30 3.3 : 1 30.90 4.1 : 1 21.30 6 : 1
1 cps 75 cps 200 cps
I-582 Pg. 2 of 6
Rev. A-0600
Page 3
DEMA MODEL 681AG-2P
BLEND CENTER
INSTALLATION INSTRUCTIONS
Table 1
163BAG (4 GPM FLOW RATE PROPOR TIONER – ¼" BARB AND TUBING)
Injection Rates For Viscosities Shown
Metering Tip Color
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
Tan 0.30 427 : 1 0.20 640 : 1 0.15 853 : 1
Orange 0.40 320 : 1 0.30 427 : 1 0.25 512 : 1
Turquoise 0.60 213 : 1 0.40 320 : 1 0.30 427 : 1
Pink 0.80 160 : 1 0.50 256 : 1 0.40 320 : 1
Clear 1. 00 128 : 1 0.70 183 : 1 0.45 284 : 1
Brown 1.20 107 : 1 0.80 160 : 1 0.50 256 : 1
Red 1. 50 85 : 1 0.90 142 : 1 0.60 213 : 1
White 1.85 69 : 1 1.10 116 : 1 0.70 183 : 1
Green 2.00 64 : 1 1.25 102 : 1 0.80 160 : 1
Blue 2.50 1 : 1 1.50 85 : 1 0.82 156 : 1
Yellow 4.00 32 : 1 1.85 69 : 1 0.90 142 : 1
Black 5.50 23 : 1 2.00 64 : 1 0.94 136 : 1
Purple 8.80 15 : 1 2.40 53 : 1 0.96 133 : 1
Gray 11.65 11 : 1 2.50 51 : 1 1.00 128 : 1
No Tip 16.20 8 : 1 3.00 43 : 1 1.20 107 : 1
1 cps 75 cps 200 cps
Table 2
163AG (4 GPM FLOW RATE PROPOR TIONER – 3/8" BARB AND TUBING)
Injection Rates For Viscosities Shown
Metering Tip Color
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
Clear 0.90 142 : 1 0.30 427 : 1 0.20 640 : 1
Purple 1.10 116 : 1 0.50 256 : 1 0.40 320 : 1
Yellow 1.80 71 : 1 1.00 128 : 1 0.70 183 : 1
Green 2.50 51 : 1 1.50 85 : 1 1.20 107 : 1
Pink 3.00 43 : 1 2.00 64 : 1 1.50 85 : 1
Turquoise 4.50 28 : 1 3.15 41 : 1 2.30 56 : 1
Black 4.80 27 : 1 3.75 34 : 1 2.80 46 : 1
Gray 6.70 19 : 1 4.80 27 : 1 3.35 38 : 1
Red 8.15 16 : 1 5.80 22 : 1 3.80 34 : 1
Blue 9.20 14 : 1 6.60 19 : 1 4.20 30 : 1
Brown 11.10 12 : 1 7.75 17 : 1 4.70 27 : 1
White 13.20 10 : 1 9.15 14 : 1 5.00 26 : 1
Orange 15.00 9 : 1 10.10 13 : 1 5.30 24 : 1
Lt. Blue 16.70 8 : 1 11.10 12 : 1 5.50 23 : 1
Tan 18.50 7 : 1 11.30 11 : 1 5.80 22 : 1
No Tip 19.40 6.6 : 1 13.00 10 : 1 6.20 21 : 1
1 cps 75 cps 200 cps
Note: All induction rates are based on a water pressure of 40 PSI.
I-582 Pg. 3 of 6
Rev. A-0600
Page 4
DEMA MODEL 681AG-2P
BLEND CENTER
INSTALLATION INSTRUCTIONS
III OPERATION
The Blend Cente r is now ready for use. Depressi ng a push button 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 o ve rfl ow if u nat ten de d, bu t may be
converted to locking buttons by cutting off the tab at the notch. (See Figure 2). Pushing the button and turning it 1/4 turn clockwise at the
end of its travel allows the valve to lock on. This makes it unnecessary 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.
IV SERVICING
CAUTION: TURN OF F WATER SUPPLY BEFORE SERVICING.
A. Proportioner fails to draw chemical:
1. Proportioner outlet tubing is cut too short for priming. Pinch outlet tube to create back pressure which will cause unit to prime.
The foot valve will keep the inlet tube primed thereafter.
2. Insufficient water supply p ressure. 2 0 PSI is the minimum allowable.
B. Proportioner stops drawing chemical:
1. Inspect foot valve for dr ied chemical or dir t. Soak in hot water to clean.
2. Prop ortioner metering tip clogged with dr ied chemical. Remove tip and try injecti ng hot water to clear interior pas sages .
C. Proportioner continues to draw chemical after water valve closes:
Chemical supply is higher than bottom of discharge tube creating a natural siphon. Lower the chemical suppl y or ha ng up o utl et tubi ng
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 hou sin g a nd care fu ll y pu ll of f
the enclosing tube so as not to drop the plunger, kick-off spring, and spacer. Check for dirt of damage impending plun ge r an d kic k-of f
spring movement. Inspect the diaphragm, making sure the two small pin holes (bleed holes) in the diaphragm conv olu ti on are cle ar t o
allow the valve to close.
CAUTION: When servicing unit, be sure that replacement parts have been installed according to drawing.
RETURNS: NO MERCHAN DISE MAY BE RETUR NED FOR CREDIT WITHOUT DEM A’S WR ITTEN
PERMISSI ON. RET URN MERCHANDISE AUTHORI ZATI ON NUMBER REQ UIRED IN
ADVANCE OF RETURN.
WARRANTY: DEMA products are warranted against defective material and wo rkm ansh ip u nde r n orm al u se and serv ic e
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 , i mpro pe r
voltage supply, physical abuse, or misapplication. Rubber and synthetic rubber parts such as “o”- ring s,
diaphragms, squeeze tubing and gaskets are considered expendable and are not covered unde r w ar ranty .
This warra nty is ext ended only to t he original buyer of DEMA products. If p roducts are alt ered or
repaired without prior approval of DEMA, this warranty will be void.
Defective units or part s should b e returned to the fact ory with transp ortat ion prepaid. If ins pection
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 u nits f or repai r o r
replacement, must be granted in advance of return.
I-582 Pg. 4 of 6
Rev. A0700
Page 5
DEMA MODEL 681AG-2P
FIGURE 2
PUSH BUT TO N ACTUATOR
PIPE PLUG & O-RING
VINYL DISCHARGE TU BING
CLOSE NIP PL E
COUPLING
INLET HOSE
ADAPTOR
STRAINER
WASHER
MOUNTING HOLES
AIR GAP PR OPORTIONER
METERING TIP
SUPPLY T UBING
TO CHEMICAL
PUSH BUT T ON
UTILITY KNIFE
7" LG TUBING
(MODEL 164AG ONLY)
FIGURE 1
CHEMICAL CONTAINER
CERA MIC WEIGHT
FOOT VALVE
I-582 Pg. 5 of 6
Rev. A0700
Page 6
66-31
BLEND CENTER, MODEL 681AG-2P
66-153
4 GPM
63-73
1 GPM
63-74
*SEE TABLE BELOW
1 GPM ONLY
63-82
63-78
100-59
4 GPM
63-76
1 GPM
63-77
93-44
1/4" BARB
63-79
3/8" BARB
63-80
3/8" BA RB
1/4" BA RB
100-15
61-9
100-38
66-139
(SPECIFY COLOR)
(SPECIFY COLOR)
1/4" TUBE
100-12
3/8" TUBE
100-11L
63-87
CERAMIC WEIGHT
FOR 1/4" TUBE
61-107-2
FOR 3/8" TUBE
61-107-1
63-39
66-140
63-35
63-36
41-7-25
63-37
41-1-8
63-38
41-15-5
63-88
4" LONG
1 GPM ONLY
63-84
10' LONG
PART NO.
41-1-8
41-7-25
41-15-5
61-22AG-4
61-22BAG-4
61-32AG-1
61-32BAG-1
61-107-1
61-107-2
63-35
63-36
63-37
63-38
63-39
63-73
63-74
63-76
63-77
63-78
63-79
63-80
DESCRIPTION
KICK-OFF SPRING
ENCLOSING TUBE
DIAPHRAGM
*4-GPM (3/8" BARB) PROPORTIONER ASSY.
*4-GPM (1/4" BARB) PROPORTIONER ASSY.
*1-GPM (3/8" BARB) PROPORTIONER ASSY.
*1-GPM (1/4" BARB) PROPORTIONER ASSY.
CERAMIC WEIG HT (F OR 3/8" TUBE)
CERAMIC WEIG HT (F OR 1/4" TUBE)
MAGNET
SPRING
SPACER
PLUNGER
VALVE BODY
NOZZLE (4 GPM)
NOZZLE (1 GPM)
SCREEN (4 GPM)
SCREEN (1 GPM)
O-RING
INLET BARB (1/4")
INLET BARB (3/8")
PART NO.
63-82
63-84
63-87
63-88
66-31
66-139
66-140
66-153
93-44
100-11L
100-11P
100-12
100-38
100-59
61-9K
61-25-2
100-15K
100-11P
DESCRIPTION
VINYL TUBE (3/16" ID X 7" LG) 1 GPM ONLY
VINYL TUBE (9/16 ID X 10' LG)
VALVE REPAIR KIT
VINYL TUBE (9/16" ID X 4" LG) 1 GPM ONLY
CLOSE NIPPLE
MAGNET HOUSING (SPECIFY COLOR)
PUSH BUTTON (SPECIFY COLOR)
PIPE PLUG & O-RING
PIPE TO GARDEN HOSE ADAPTOR
VINYL TUBE 3/8" ID X 8' LG.
FOOT VALVE
VINYL TUBE (1/4 ID X 8' LG.)
INLET WASHER SCREEN
STRAINER WASHER
ACCESSORIES
METERING TI P KIT (15 SIZES)
FRESH WATER OUTLET KIT
METERING TI P KIT (14 SIZES)
I-582 Pg. 6 of 6
Rev. A0700
Loading...