DEMA 681GAP-2P User manual

DEMA BLEND CENTERS
MODEL 681GAP-2P
INSTRUCTION SHEET
I-795 Pg. 1 of 4
Rev. B-36452 1/5/11
1. PARTS CHECKLIST:
A. Blend Center Assembly B. Vinyl Supply Tubing with Foot Valve
C. Ceramic Weight D. Vinyl Outlet Tubing (For 4 or 1 GPM side)
E. Screw/Anchor Kit F. Label Card G. Metering Tip Kit
* Quantities may vary depending on the model.
2. INSTALLATION:Note: All installations must conform to local plumbing codes and use the approved backflow preventers.
Pressureindicating teeisto beinstalled with existing faucetsaccording to local plumbingcodesin thestateofWisconsinand
any other state that requires the use of a pressure indicating tee. WARNING: Water supply should not exceed 125 psiand
water temperature must not exceed 150°F.
A. Mounting and water supply:
Locate mounting holes on a permanent surface for the Blend Center. Drill all of the holes into the drywall usinga 1/4” diameterbit for
use with the included #10 screw and anchor set. (If mounting the Blend Center to wood and you do not plan to use the included
anchors, drill 1/8” diameter holes.) Insert the anchors into drilled holes and hammer them into the wall until theyareflushwithfaceof
wall. Assemble all of the #10 screws with a Phillips screwdriver into the anchors so the screw heads are sticking out of the wall
approximately ½”. Mount the Blend Center byinserting the screw heads through the keyhole slots in the base and tighten the screws.
The water inlet is equipped with a female garden hose fitting (with strainer washer) for attaching a water supplyhose. The fittingmay
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 female hose fitting. Note: Apply pipe dope, hand tighten, then turn 1-½ times with a wrench. DO
NOT OVER TIGHTEN. WARNING: Do not use Teflon® tape to seal internal plastic threads as the extra thickness ofthe tape may
cause the plastic to crack. Use a non-welding liquid sealant instead.
B. Chemical supply:
Place the chemical containers in a convenient location not more than 6 feet belowthe blend center (greater lifts will reduce injection
capabilities). Insert the vinyl supply tubing with the foot valve ends into the chemical containers. Cutthevinyltubestoanyconvenient
length that will allow the tubing to extend from the bottom ofthe chemical container to the proportioner inlet barbs. (See Figure 1)
Gummed labels are provided for product labeling.
C. Outlet:For 4 gpm proportioner, cut the ½” ID X 6’ Lg. tubing to the desired length and attach it to the proportioner outlet barb. Do
not slide tubing pass the first three barbs. For 1 gpm proportioner, do not cut the ½” ID X 6’ Lg. tubing.
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 using Tables 1 and 2.
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 approximately equal to the viscosity of most dishwashing detergents
TABLE 1 - 1 GPM FLOW RATE PROPORTIONER, 1/4” I.D. TUBING
Injection Rates For Viscosities Shown
1 cps 75 cps 200 cps
Metering Tip Color
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
Tan 1.03 125-1 0.76 168-1 0.38 333-1
Orange 1.24 103-1 0.98 130-1 0.53 241-1
Turquoise 1.43 89-1 1.07 119-1 0.61 211-1
Pink 2.47 52-1 1.58 81-1 0.92 139-1
Light Blue* 3.05 42-1 2.1 61-1 1.06 121-1
Brown 3.48 37-1 2.31 55-1 1.15 111-1
Red 4.38 29-1 2.83 45-1 1.23 104-1
White 5.33 24-1 3.1 42-1 1.37 93-1
Green 6.38 20-1 3.63 35-1 1.4 91-1
Blue 6.77 19-1 3.78 34-1 1.45 88-1
Yellow 9.90 13-1 5.1 25-1 1.48 86-1
Black 15.00 9-1 6.54 20-1 1.53 84-1
Purple 24.94 5-1 7.28 18-1 1.57 82-1
Gray 35.94 4-1 8.5 15-1 1.64 78-1
No Tip 73.21 2-1 9.35 14-1 1.87 69-1
*Metering tip color was formerly clear.All induction rates are base on a water pressure of 40 psi.
3. OPERATION:
The Blend Center is now ready for use. Pressing a push button opens the water valve, allowing flow throughthechemicalproportioner that
mixes chemical at the desired rate. The buttons are spring loaded to prevent overflow if unattended, but may be converted to locking
buttons bycutting offthe 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. Turning the button in a counter-clockwise direction will release it, allowing the valve to shut off.

DEMA BLEND CENTERS
MODEL 681GAP-2P
INSTRUCTION SHEET
I-795 Pg. 2 of 4
Rev. B-36452 1/5/11
TABLE 2 - 4 GPM FLOW RATE PROPORTIONER, 1/4” I.D. TUBING
Injection Rates For Viscosities Shown
1 cps 75 cps 200 cps
Metering Tip Color
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
Tan 0.33 387-1 0.26 500-1 0.12 1090-1
Orange 0.42 307-1 0.32 430-1 0.17 735-1
Turquoise 0.51 251-1 0.34 382-1 0.19 676-1
Pink 0.78 165-1 0.56 230-1 0.3 422-1
Light Blue* 0.87 147-1 0.67 192-1 0.33 391-1
Brown 0.99 129-1 0.74 174-1 0.37 345-1
Red 1.37 93-1 0.91 141-1 0.44 289-1
White 1.52 84-1 1.04 123-1 0.48 264-1
Green 1.72 74-1 1.22 105-1 0.52 244-1
Blue 2.13 60-1 1.27 101-1 0.54 239-1
Yellow 3.05 42-1 1.71 75-1 0.56 229-1
Black 4.50 28-1 1.96 65-1 0.57 224-1
Purple 7.75 17-1 2.4 53-1 0.59 217-1
Gray 9.86 13-1 2.54 50-1 0.63 204-1
No Tip 19.63 7-1 3.16 40-1 0.67 190-1
NOTE: Leaner dilutions can be achieved by ordering DEMA ultra lean tip kit 100-15KU or capillary tip 44-61P.
4. SERVICING:CAUTION: TURN OFF 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 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 tryinjecting in hot water. If there is no suction, remove
proportioner and soak in hot water to clear interior passages.
3. Inspect proportioner to ensure that there are no mineral deposit build-ups on the nozzle. If so, soak proportioner body in de-
liming solution. (Remove all parts attached to proportioner before soaking in de-liming solution.) Note: Use care when
handling hazardous chemicals.
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 supply vessel or hang up outlet tube after use.
D. Valve Malfunction: Check that the button moves freely in & out 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 carefullypull off the enclosing tube so as not to drop the plunger, kick-offspring, and spacer. Check for dirt or damage
impeding plunger and kick-off spring movement. Inspect the diaphragm, making sure the two small pinholes (bleed hole) 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.
RETURNS: NO MERCHANDISE MAY BE RETURNED FOR CREDIT WITHOUT DEMA’S WRITTEN PERMISSION.
RETURN MERCHANDISE AUTHORIZATION NUMBER REQUIRED IN ADVANCE OF RETURN.
WARRANTY: DEMA products are warranted against defective material andworkmanship under normal use and service for oneyearfrom
the date of manufacture. This limited warranty does not applyto anyproducts which have a normal life shorterthan oneyear
or failure and damage caused bychemicals, corrosion, improper voltage supply, physical abuse, or misapplication. Rubber
and synthetic rubber parts such as “O”- rings, diaphragms, squeeze tubing and gaskets areconsideredexpendableandarenot
covered under warranty. This warrantyis 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, theywill be repaired or replaced without charge, F.O.B. factory. DEMA assumes no liabilityfor damages. Return
merchandise authorization number, to return units for repair or replacement, must be granted in advance of return.

DEMA BLEND CENTERS
MODEL 681GAP-2P
INSTRUCTION SHEET
I-795 Pg. 3 of 4
Rev. B-36452 1/5/11
NO. PART NO. DESCRIPTION
1 150-6 Rubber Washer
2 61-36 Flow Disk
3 16-3-6 1/2” I.D. x 6” Lg. Vinyl
Outlet Tube (1 GPM Only)
4 61-21 1/2” I.D. x 6’ Lg. Vinyl
Outlet Tube (4 GPM Only)
5 63-89-1 Rubber Washer (1/32”
Thick)
6 16-30 Action Gap Assembly
Action Gap
Mounting Holes
Coupling
Foot Valve
Metering Tip
Proportioner
Vinyl Disharge Tubing
FIGURE 2
Push Button
Utility Knife
Ceramic Weight
FIGURE 1
Chemical Container
Push Button Actuator
Pipe Plug & O-Ring
Close Nipple
Supply Tubing
To Chemical
Inlet Hose
Adapter
Strainer
Washer
3
1
2
4
1
5
6

DEMA BLEND CENTERS
MODEL 681GAP-2P
INSTRUCTION SHEET
I-795 Pg. 4 of 4
Rev. B-36452 1/5/11
NO. PART NO. DESCRIPTION
1 66-139 Magnet Housing (Specify Color)
2 66-140 Push Button (SpecifyColor)
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 Kick-off Spring
9 63-38 Plunger
10 41-15-10 Diaphragm
11 63-39 Valve Body
12 100-38 Strainer Washer
13 65-10-2 Adapter
14 65-100-2 Coupling
15 63-57 3/8” Coupling
16 99-5-1 3/8” Nipple x 1 ½” Lg.
17 66-31 Close Nipple
18 66-153 Pipe Plug & O-Ring Assy.
NO. PART NO. DESCRIPTION
19 16-30 Action Gap Assembly
20 61-99GAP-2 1 GPM (1/4” Barb) Proportioner (green)
21 61-22GAP-2 4 GPM (1/4” Barb) Proportioner (Gray)
22 63-78 O-Ring
23 63-79 Inlet Barb (1/4”)
24 100-15K Metering Tip Kit–14Sizes (For ¼” Barb)
25 16-3-6 ½”id x 6”Lg. Vinyl Outlet Tube (1GPM)
26 61-21 ½”id x 6’Lg. Vinyl Outlet Tube (4GPM)
27 100-12 ¼”id x 8’Lg. Vinyl Supply Tubing
28 61-107-2 Ceramic Weight
29* 100-16E-1 Foot Valve
ACCESSORIES
NO. PART NO. DESCRIPTION
30 68-6-QD2 Pressure Indicating Tee
*Foot Valve also available with silicone (100-16S-1) or Viton (100-16V-1) rubber seals. Please specify when ordering.
(SPECIFY COLOR)
(SPECIFY COLOR)
25 26
29
18 17
19
22
24
23
See page 8 for
breakdown
See page 8 for
breakdown
20 21
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27
16 15 14
10
11
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