Dema 681-1 Installation Manual

Page 1

DEMA BLEND CENTER

MODEL: 681-1

INSTALLATION INSTRUCTIONS

1. PARTS:

A. Blend center assembly. B. 1 pc. 1/4"ID x 8ft. long vinyl supply tubing, foot valve and ceramic weight. C. 1 pc. 1/2"ID x 6ft. long vinyl outlet tubing. D. 2 pcs. #8 pan head 1-1/2" long mounting screws & anchors. E. 1 pc. label card. F. Metering tip kit.

2. INSTALLATION: Note: All installations must conform to lo cal plumbing codes and use approved backflo w preventers.

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 th e k ey 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 f itting 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 1-1/2 times with a wrench. DO NOT OVER

TIGHTEN.

B. Chemical supply:

Place the chemical container 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 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:

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 flow rate propor tioner - D o not cut tub ing to less than 1 8 " long to insure p riming. Longer lengths may be used up to 1 0 feet. Models with the optional 1 GPM proportioners may use tubing cut to any length.

D. Chemical injection adjustment: WARNING: USE CARE WHEN HANDLING HAZARDOUS CHEMICALS.

The chemical feed rate is controlled by a metering ti p screwed into the proportioner barb. Select a tip using Table 1 or 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 approxim ately equal to the viscosity of most dis hwashing detergents.

3. OPERATION:

The Blend Center is now ready for use. Depressing the push button opens the valve, allowing water to flow through the chemical proportioner that mixes chemica l at the des ir ed r ate. The button is s p ring loaded to p r event a ccidenta l over flow if unattended, but may be converted to a locking button by cutting off the tab at the notch. (See Figure 2). Pushing the button and tubing it 1/4 turn clockwise at the en d of i ts trav el al low s the valve to lock on. This makes it unnece ss ary for the attendant to hold the button in while filling large containers. Tur ning 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 SE RVICING.

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 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 tr y injecting hot water to clea r interior passa ges.

C. Proportioner continues to draw chemical after water valve closes:

Chemical supply is higher than bottom of dischar ge tube creating a natur al 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 p lunger 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.

I-404 Pg. 1 of 4 Rev. B-36452 1/3/11

Page 2

DEMA BLEND CENTER

MODEL: 681-1

INSTALLATION INSTRUCTIONS

Table 1 - 1 GPM flow rate

Injection Rates For Viscosities Shown

Metering Tip Color

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

Clear 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

1 cps 75 cps 200 cps

Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio

Table 2 - 4 GPM flow rate

Injection Rates For Viscosities Shown

Metering Tip Color

1 cps 75 cps 200 cps

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

Clear 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

RETURNS: NO MERCHANDISE MAY BE RETURNE D FOR CREDIT WITHOUT DEMA’S WRIT TEN PE RMI S SI ON .

RETURN MERCHANDISE AUTHORIZATION NUMBER REQUIRED IN ADVANCE OF RETURN.

WARRANTY: DEMA products are warranted against defectiv e material and workmanship under no rm al us e an d serv ic e f o r o ne y ea r f ro m

the date of manufacture. This limited warranty does not apply to any products which have a normal life shorter than one year or failu re and dam age 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 expe nd able 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 p ar ts should b e retur ned to the factory with transportation p rep aid. If inspection s hows them to be defective, they will be rep aired 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-404 Pg. 2 of 4 Rev. B-36452 1/3/11

Page 3

PUSH BUTTON ACTUATOR

PIPE PLUG & O-RING

SIPHON BREAKER

PROPORTIONER

VINYL DISCHARGE TUBING

DEMA BLEND CENTER

MODEL: 681-1

INSTALLATION INSTRUCTIONS

MOUNTING HOLES

METERING TIP

SUPPLY TUBING TO CHEMICAL

PUSH BUTTON

KNIFE

CHEMICAL CONTAINER

FIGURE 1

CERAMIC WEIGHT

FOOT VALVE

FIGURE 2

I-404 Pg. 3 of 4 Rev. B-36452 1/3/11

Page 4

DEMA BLEND CENTER

MODEL: 681-1

INSTALLATION INSTRUCTIONS

1817

20 27

(SPECIFY COLOR)

25 26

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 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” 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-404 Pg. 4 of 4 Rev. B-36452 1/3/11