DEMA 681AG-4 Blend Center
PARTS CHECKLIST
- Blend Center Assembly
- 4-¼ x8 Long Vinyl tubing and foot valve assembly.
- Ceramic Weight
- Screw/Anchor Kit Set.
- Metering Tip Kit.
- 4-3/8 ID x 8 Long Vinyl tubing and Foot Valve
- 9/16 ID x 20 Long Vinyl Outlet Tubing.
- Label Card
INSTALLATION
This product is designed only to be used as described in this instruction sheet. Adhere to all warnings and cautions identified.
WARNING
Installations must conform to all local and national plumbing codes and use approved backflow prevention and pressure relief devices where required. ALWAYS DISCONNECT DISPENSER FROM WATER SOURCE WHEN DISPENSER IS NOT IN USE. Always read SDS for all chemicals used and follow personal protective guidelines.
Note
Pressure indicating tee is to be installed with existing faucets according to local plumbing codes in the state of Wisconsin and any other state that requires the use of a pressure indicating tee.
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 female hose fitting. Note: Apply pipe dope, hand tighten, and then turn 12 times with a wrench. DO NOT OVER TIGHTEN.
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 female garden hose fitting at the water inlet of the Blend Center (See Figure 3). Water supply should not exceed 125 psi and water temperature must not exceed 160°F.
Chemical supply
Place the chemical containers in a convenient location not more than 6 feet below the blend center greater lifts will reduce injection 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 proportioned inlet barbs. Gummed labels are provided for product labeling.
Outlet
Cut the 9/16″ I.D. outlet tubing to the desired lengths and attach them to the proportioned outlets. Longer lengths may be used up to 10 feet. The 7″ long tubing must be left on the 1 GPM proportioned to insure priming.
Chemical injection adjustment
WARNING
USE CARE WHEN HANDLING HAZARDOUS CHEMICALS. Chemical feed rates are controlled by metering tips screwed into the proportioner barbs. Select a tip for each barb using Table 1 or 2 as a guide.
DEMA 681AG-4 BLEND CENTER INSTALLATION INSTRUCTIONS
OPERATION
The Blend Center is now ready for use. Depressing 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 overflow if unattended, but may be converted to locking buttons by cutting off 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 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.
SERVICING
CAUTION
TURN OFF WATER SUPPLY BEFORE SERVICING.
Proportioner fails to draw chemical
- Pinch outlet tube to create back pressure which will cause unit to prime. The foot valve will keep the inlet tube primed.
- Insufficient water supply pressure. 20 PSI is the minimum allowable.
Proportioner stops drawing chemical
- Inspect foot valve for dried chemical or dirt.
- Soak in hot water to clean.
- 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. - Chemical supply is higher than bottom of discharge tube creating a natural siphon.
- Lower the chemical supply or hang up outlet tubing after use.
ValvXe 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 carefully 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 spring movement. Inspect the diaphragm, making sure the two small pin 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.
| Metering Tip Color | Injection Rates For Viscosities Shown | |||||
| 1 cps | 75 cps | 200 cps | ||||
| 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 |
| Light Blue* | 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 |
Metering tip color was formerly clear. Note: All induction rates are base on a water pressure of 40 psi.
TABLE 2 164 AG GPM FLOW RATE PROPORTIONER 3/8 BARB AND TUBING
| Metering Tip Color | Injection Rates For Viscosities Shown | |||||
| 1 cps | 75 cps | 200 cps | ||||
| 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 |
|
DEMA 681AG-4 BLEND CENTER INSTALLATION INSTRUCTIONS
| Metering Tip Color | Injection Rates For Viscosities Shown | |||||
| 1 cps | 75 cps | 200 cps | ||||
| 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 | 11.80 | 11-1 | 5.80 | 22-1 |
| No Tip | 19.40 | 6.6-1 | 13.00 | 10-1 | 6.20 | 21-1 |
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 and workmanship under normal use and service for one year.
DEMA 681AG-4 BLEND CENTER INSTALLATION INSTRUCTION
PRESSURE INDICATING TEE INSTALLATION
| 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 | 61-22GAP-2 | GPM PROPORTIONER (WHITE) |
| 17 | 61-99GAP-2 | GPM PROPORTIONER GREEN |
| NO. | PART NO | DESCRIPTION |
| 18 | 61-21 | ½” ID X 6’ LONG VINYL OUTLET TUBE (4 GPM) |
| 19 | 16-3-6 | 1/3” ID X 6’ LONG VINYL OUTLET TUBE 1 GPM |
| 20 | 63-78 | O-RING EP |
| 21 | 63-79 | INLET BARB 1/4 |
| 22 | 63-80 | INLET BARB 3/8 |
| 23 | 100-15K | METERING TIP KIT 1/4 BARB |
| 24 | 61-9K | MTERING TIP KIT 3/8 BARB |
| 25 | 100-12 | ¼ ID X 8’ LONG VINYL SUPPLY TUBING |
| 26 | 100-12L | 3/8 ID X 8’ LONG VINYL SUPPLY TUBING |
| 27 | 61-107-2 | CERAMIC WEIGHT FOR ¼TUBING |
| 28 | 61-107 | CERAMIC WEIGHT FOR 3/8 TUBING |
| 29 | 100-16E-1 | FOOT VALVE |
| 30 | 68-6-QD2 | PRESSURE INDICATING TEE |
