Page 1
DEMA BLEND CENTER
MODELS: 681-1-163T
INSTALLATION INSTRUCTIONS
1. PARTS
A. Blend Center Assembly B. ¼” ID x 8’ Long Vinyl Supply Tubing/Foot Valve
C. Ceramic Weight 3/8 ID D. ½” ID x 6’ Long Vinyl Outlet Tubing (4 GPM)
E. #10 Screw and Anchors F. Label Card
G. Metering Tip Kit.
:
2. INSTALLATION
A. Mounting and water supply:
Remove Blend Center lid and hold unit in pos ition to locate the mounting screw p ositions. Install the mounting scr ews; leaving
approximately 1/8" extension between the wall and screw head. Mount the Blend Center by inserti ng the scre w head s t hrou gh th e k ey
hole slots in the b ase a nd tighten the s cr ews ( See Figure 1 ). T he water inlet is eq uipp ed with a female garden hose fitting (with
strainer washer) for attaching a water supply hose. The f itting m ay be removed to permit direct conn ection to a 3/8" NPT pipe. Th e
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 10 times with a wrench. DO NOT OVERTIGHTEN.
B. Chemical supply
Place the chemical container in a convenient location not more than 6 f eet below the blend center (greater lifts wil l reduce injection
capacities). Insert the vinyl supply tubing with the foot valve end into the chemical container. Cut the vinyl tube to any convenient
length that will allow it to extend from the bottom of the chemical container to the proportioner inlet barb. (See Figure 1) Gummed
labels are provided for product labeling.
C. Outlet
D. Chemical injection adjustment
:
Cut the 1/2"ID outlet tubing to the desired length and attach it to the proportioner outlet; model 681-1 with the standard 4 GPM f lo w
rate proportioner - do not cut tubing to less than 18" long to insure priming. Longer lengths may be used up to 10 feet. Models with
the optional 1 GPM proportioners may use tubing cut to any length.
The chemical feed rate is controlled by a metering tip screwed int o the proportioner barb. Select a tip using Table 1 or 2 as a guide.
1 cps (centipoise) is equal to the viscosity of water
75 cps is approximately equal to the viscosity of 10 weight motor oil
200 cps is approxim ately equal to the visco sity of most dishwashing detergents
: Note: All installations must conform to local plumbing codes and use approved backflow preventers.
:
: WARNING: USE CARE WHEN HANDLING HAZARDOUS CHEMICALS.
3. OPERATION
The Blend Cente r is now ready for use. Dep ressi ng the push b utton opens t he valve, allowing water t o flow through the chemical
proportioner that mixes chemical at the desired rate. The button is spring loaded to prevent accidental ov erf low i f una tte nd ed, but ma y be
converted to a locking button 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 tr avel allows the va lve to lock on. This makes it unneces sa r y for the attendant to hold the button in while filling large
containers. Turning the button in a counterclockwise 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. Propor tioner outlet tub ing is cut too shor t for pr iming. Pinch outlet tube to create back pressur e which will cause unit to
prime. The foot valve will keep the inlet tube primed thereafter.
2. Insufficient water supply pressure. 20 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. Proportioner metering tip clogged with dried chemical. Remove tip and try injecting hot water to clear interior passages.
C. Proportioner continues to draw chemical after water valve closes
creating a natural siphon. Lower the chemical supply or hang up outlet tubing after use.
I-447 Pg. 1 of 5
Rev. C-36452 1/5/11
:
:
: Chemical supply is higher than bottom o f disc ha rge tube
Page 2
DEMA BLEND CENTER
MODELS: 681-1-163T
INSTALLATION INSTRUCTIONS
D. Valve malfunction
and released, indicating that the magnet is activating the plunger properly. Remove cover. To inspect internal parts, unscrew
magnet housing and carefully pull off the enclosing tube so as not to drop the plunger, kick-off spring, and spa ce r. Che ck fo r d irt
or damage impeding plunger and kick-off spring movement. Inspect the diaphragm, making sure the two small pinholes (bl eed
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.
Metering Tip Color
Clear 0.30 430-1 0.22 592-1 0.13 864-1
Purple 0.48 265-1 0.32 406-1 0.24 524-1
Yellow 1.28 100-1 0.82 157-1 0.6 212-1
Green 1.67 77-1 1.29 99-1 1 128-1
Pink 2.36 54-1 1.65 77-1 1.25 103-1
Turquoise 3.76 34-1 2.55 50-1 1.85 69-1
Black 4.47 29-1 3.03 42-1 2.12 60-1
Gray 5.53 23-1 3.67 35-1 2.58 50-1
Red 7.00 18-1 4.79 27-1 2.79 46-1
Blue 8.78 15-1 5.39 24-1 3.06 42-1
Brown 10.95 12-1 6.49 20-1 3.35 38-1
White 14.19 9-1 7.08 18-1 3.46 37-1
Orange 17.58 7-1 7.91 16-1 3.71 35-1
Light Blue 21.75 6-1 8.66 15-1 3.9 33-1
Tan 27.98 5-1 9.15 14-1 4.11 31-1
No Tip 33.15 4-1 10.54 12-1 4.52 28-1
Metering Tip Color
Clear 2.28 56-1 0.63 204-1 0.44 292-1
Purple 2.98 43-1 1.22 105-1 0.76 168-1
Yellow 5.18 25-1 2.51 51-1 2.01 64-1
Green 6.37 20-1 4.22 30-1 3.14 41-1
Pink 8.76 15-1 5.59 23-1 4.17 31-1
Turquoise 12.01 11-1 8.44 15-1 6.12 21-1
Black 15.16 8-1 9.93 13-1 7.09 18-1
Gray 18.97 7-1 12.55 10-1 8.73 15-1
Red 25.38 6-1 15.84 8-1 10.07 13-1
Blue 28.24 5-1 17.92 7-1 11.7 11-1
Brown 36.99 4-1 21.31 6-1 12.04 10.5-1
White 45.52 3-1 25.26 5-1 12.67 10-1
Orange 53.31 2.5-1 28.44 4.5-1 13.14 9.75-1
Light Blue 60.27 2.25-1 30.5 4-1 13.51 9.5-1
Tan 72.94 2-1 33.4 3.75-1 14 9-1
No Tip 77.90 1.75-1 35.85 3.5-1 14.5 8.75-1
: Check that the button moves freely up & down and that a "click" can be heard when the button is pushed
Table 1 - 4 GPM flow rate
Injection Rates For Viscosities Shown
1 cps 75 cps 200 cps
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
Table 2 - 1 GPM flow rate
Injection Rates For Viscosities Shown
1 cps 75 cps 200 cps
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
Note: All induction rates are based on a water inlet pressure of 40 psi.
* Tips are available upon special request.
I-447 Pg. 2 of 5
Rev. C-36452 1/5/11
Page 3
DEMA BLEND CENTER
MODELS: 681-1-163T
INSTALLATION INSTRUCTIONS
RETURNS: NO MERCHANDISE MAY BE RETURNED FOR CREDIT WITHOUT DEMA’ S WRITTEN PERMISSION. RETU RN
MERCHANDISE AUTHORIZATION NUMBER REQUIRED IN ADVANCE OF RETURN.
WARRANTY: DEMA products are warranted against defective material and workmanship under normal use and service f or one year from
the date of manufacture. This limited warranty does not apply to any products which have a normal life shorter tha n o ne y ea r
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 con sid ered ex pend able and are no t
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 retur ned to the factory with transpor tation prep aid. If inspection shows them to be
defective, they wil l be repaired or replaced without charge, F.O.B. f actory. DEMA assumes no liabi l it y f o r d am ag es . Ret urn
merchandise authorization number, to return units for repair or replacement, must be granted in advance of return.
Push Button Actuator
Pipe Plug & O-Ring
Siphon Breaker
Proportioner
Vinyl Discharge Tubing
Mounting Holes
Metering Tip
Supply Tubing To Chemical
Chemical Container
FIGURE 1
Ceramic Weight
Push Button
Foot Valve
FIGURE 2
Knife
I-447 Pg. 3 of 5
Rev. C-36452 1/5/11
Page 4
DEMA BLEND CENTER
MODELS: 681-1-163T
INSTALLATION INSTRUCTIONS
NO. PART NO. DESCRIPTION
1 66-139 MAG NET HOUSING
2 66-140 PUSH B UTTON
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 GAR DEN 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’ L ONG VINYL OUTLET
TUBE (4 GPM)
20 16-3-6 1/3” ID X 6’ LONG VI NYL
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” BAR B)
25 61-9K METERING TIP KIT (3/8” BARB)
26 100-12 ¼” ID 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 VALVE
30 68-6-QD2 PRESSURE INDICATING TEE
31 61-25-2 FRESH WATER OUTLET KIT
I-447 Pg. 4 of 5
Rev. C-36452 1/5/11
Page 5
DEMA BLEND CENTER
MODELS: 681-1-163T
INSTALLATION INSTRUCTIONS
PROPORTIONER BREAKDOWN
1 GPM
Proportioner
1
2
3
4 GPM
Proportioner
1
4
“ACTION GAP”/PROPORTIONER
NO. PART NO. DESCRIPTION
1 150-6 Rubber Washer
2 61-36 Flow Disc
3 16-3-6 ½” I.D. x 6” Lg. Vinyl tube ( 1 GPM
Only
4 16-3-6 ½” I.D. x 6” Lg. Vinyl tube ( 1 GPM
Only
I-447 Pg. 5 of 5
Rev. C-36452 1/5/11
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