Dema 681GAP-4 Installation Manual

BLEND CENTER

MODEL: 681GAP-4

INSTALLATION INSTRUCTIONS

1. PARTS CHECKLIST

:

A. Blend Center Assembly B. Vinyl Supply Tubing and Foot Valve
C. Ceramic Weight D. Vinyl Outlet Tubing
E. Screw and Anchor Kit F. Label Card G. Metering Tip Kit

2. INSTALLATION

: Note: All installations m ust co nf orm to lo cal plumbing c o des and use appr o ved backf lo w preventers. Pr essure
indicating tee is to be installed w ith ex isting f aucets acco rding to local plumbing c odes in the state o f Wi sconsi n and any other state
that requires the use of a pressure indi cating tee. WARNING: Water supply should no t exce ed 125 psi an d w a te r t em pe r atu re m ust
not exceed 150°F.

A. MOUNTING AND WATER SUPPLY:

Locate mounting holes on a permanent surface. Drill all of the holes into the drywall using a 1/4” diameter bit for use with the included
#10 screw and anchor set. (If mounting the Blend S afe 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 they are flush with face of wall. Assemble all of th e #10
screws with a Phillips screwdriver into the anchors so the screw heads are sticking out of the wall approximately ½”. Mount the Blend
Safe by inserting 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 (wit h strainer washer) for attaching a wat er supply hose. The water inlet may be removed to permit d ire c t c on n ect io n
to a 3/8" NPT pipe. The unit is designed so water can be supplied to either side by interchanging the pipe plug with the pipe and female
hose fitting. Note: Apply pipe dope, hand tighten, and then turn 1-1/2 times with a wrench. DO NOT OVER TIGHTEN.
WARNING: Do not

use Teflon® tape to seal internal plastic threads as the extra thickness of the tape may c au se t he pla st ic to cra ck. Us e

a non-welding liquid sealant instead.

B. Pressu re Indica ting Tee Inst allat ion

: Screw female quick disconnect to faucet and attach pressure indicating tee to female quick

disconnect. Attach female end of reinf orced hose to m ale threads of tee, then at tach the m ale end to t he fem ale garden hose f itti ng at the
water inlet of the Blend Safe (See Figure 3).

C. Chemical Supply

: (Refer to Fig. 1) Place the chemical containers in a convenient location not more than 6 f e et be low th e B len d Ce nte r.

Slip a ceramic weight over the chem ical supply tube. Insert the end w ith the f oot valve and ceramic we i gh t o f t h e c he mi ca l suppl y t ubi ng
into the chemical container. Cut the chemical supply tubing to any convenient length that will allow it to extend from the bottom of the
chemical container to the proportioner inlet barb. Insert other end of chemical supply tubing onto the barb con ne cto r te e. Gu mm ed labe ls
are provided for product labeling.

D. Outlet

: Cut the 1/2" I.D. outle t tub ing to the des ired le ngths and attach them to the propor tioner outlets Not e: D o not force outlet

tubing onto the larger bar bs on the proportioner.

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

Chemical f eed rates are controlled by metering tips screwed into the proportioner barbs. Select a tip using Table 1 or 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

Metering Tip Color

1 cps 75 cps 200 cps

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

Li ght 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

I-797 Pg. 1 of 6
Rev. B-36452 1/5/11

BLEND CENTER

MODEL: 681GAP-4

INSTALLATION INSTRUCTIONS

*Metering tip color was formerly clear. All induction rates are base on a water pressure of 40 psi.

TABLE 2 - 4 GPM FLOW RATE PROPORTIONER, 1/4” I.D. TUBING

Injection Rates For Viscosities Shown

Metering Tip Color

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

1 cps 75 cps 200 cps

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

NOTE: Leaner dilutions can be achieved by ordering DEMA ultra lean tip kit 100-15KU

3. OPERATION

The Blend Safe is now ready f or use. Depressing a push button opens the valve, allowing water to flow through the chemical proport io ner th at
mixes chemical at the desired rate. The buttons are spring loaded to prevent accidental ov erflow if unattend ed it may be conv ert ed t o a lo ck in g
button 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 unnec essa ry for the attendant to hold the button in while filling large container s. Turning the button in a
counterclockwise direction will release it, allowing the valve to shut off.

4. SERVICING
A. Proportioner fails to draw chemical:

:

: CAUTION: TURN OFF WATER SUPPLY BEFORE SERVICING.

1. Pinch outlet tube to create back pressure, which will cause unit to prime. The foot valve w ill 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 meter ing tip clogged with dried c hemical. Remove tip and try injecting 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:

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 push ed and re lea sed ,

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 or d am age im ped ing plu ng er
and kick-off spring movement. Inspect the diaphragm, making sure the two small pin holes (bleed hol e) i n t he dia phrag m con vo lut ion are
clear to allow the valve to close.

Chemical supply is higher than bottom of discharge tube

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 RE QUIRE D IN ADVANCE OF RETURN.

I-797 Pg. 2 of 6
Rev. B-36452 1/5/11

BLEND CENTER

MODEL: 681GAP-4

INSTALLATION INSTRUCTIONS

WARRANTY: DEMA products are warranted against defective material and workmanship under normal use and service f o r o ne y ear

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, c orrosion, imp roper voltage sup ply, physical abuse, or
misapplication. Rubber and synthetic rubber p arts such as “O”- rings, diaphragms, squeeze tubing and gaskets are
considered expendable 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 parts should be returned to the factory with transportation prepaid. If inspection shows them to be
defective, they wil l be repaired or replaced without charge, F.O.B. f actory . DEMA assumes no liability f or damages.
Return mer chandi se authorization number , to r etur n units for r ep air or rep lac ement, must be granted in advanc e of
return.

Pipe Plug & O-Ring

Vinyl Discharge Tubing

Push Button Actuator

Close Nipple

Chemical Container

Adapter Stem

Mounting Holes

Action Gap

Proprotioner

Metering Tip

Inlet Hose Adapter

Strainer Washer

Supply Tubing

To Chemical

FIGURE 1

Push Button

Knife

Ceramic Weight

Foot Valve

FIGURE 2

I-797 Pg. 3 of 6
Rev. B-36452 1/5/11

BLEND CENTER

MODEL: 681GAP-4

INSTALLATION INSTRUCTIONS

PRESSURE INDICATING TEE INSTALLATION

BLEND CENTER

WATER INLET HOSE

OUTLET TUBING

PRESSURE

INDICATING

TEE

CHEMICAL
INLET TUBI NG

WATER INLET HOSE

FIGURE 3

I-797 Pg. 4 of 6
Rev. B-36452 1/5/11

BLEND CENTER

MODEL: 681GAP-4

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 TUB E
6 63-87 VALVE REPAIR KIT
7 63-37 SPACER
8 41-1-8 KICKOF F 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-797 Pg. 5 of 6
Rev. B-36452 1/5/11

BLEND CENTER

MODEL: 681GAP-4

INSTALLATION INSTRUCTIONS

5

1

1

2

3

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 Assemb ly

4

6

I-797 Pg. 6 of 6
Rev. B-36452 1/5/11