Page 1
DEMA 652-163 DUO-FEED
INSTALLATION INSTRUCTIONS
I. PARTS:
A . Dispenser assembly
B. 1 pc.1/2 in. I.D. X 6 ft. vinyl outl et tubing.
C. 2 pc. 3/8 in. O.D. X 8 ft. vinyl supply tubing, foot valve & ceramic weight.
D. 4 pc. #10 pan head 3/4 in. long mounting screw.
E. 4 pc. 7/8 in. long plastic mounting anchor.
F. 1 pc. Metering tip kit.
II. INSTALLATION: (See Figure 1 for setup diagram)
A. Mounting and Water Supply:
Mount the unit on a permanent surface using 4 screws inserted through the holes in the case. The water inlet i s equ ipped w ith a
female garden hose adapter to permit connection to the right hand side of the unit. The water supply can be attached to the left
side of the unit by interchanging the plug in the left-hand side with the garden hose adapter. Note: The water supply pressure
should not exceed 150 psi.
B. Chemical Supply:
Place the chemical containers in a convenient location not more than 6 ft. below the dispensing unit. Note: greater lifts will
reduce injection ca paciti es. Inser t the ends with the foot valves of the 8 ft long, 3/8 in. O.D . vinyl tubes into the chemical
containers. Cut the vinyl tubes to any convenient length that will allow the tubes to extend from the bottom of the chemical
container to the proportioner inlet barb. Slide the ceramic weights over the 3/8 in. O.D. tubing and down to the foot valves.
Repeat this procedure for both containers.
C. Outlet:
For each of the prop ortioner outlets: Cut a piece of the 1/2 in. I.D. outlet tubing into the des ired lengths and attach to the
proportioner outlet. Note: To insure priming, do not cut tubing to less than 18 in.
Caution: To prevent co ntinuous sipho ning, the outlet of the discharge tubing shoul d not be b el o w th e le ve l of c he mi c al
D. Injection Adjustment:
WARNING: USE CARE WHEN HANDLING HAZARDOUS CHEMICALS.
Chemical feed rates are controlled by metering tips screwed into the proportioner barb. Use Table 1 as a gu id e f or ti p se lec ti on .
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 approx imately equal to the viscosity of many dishwashing detergents.
III. OPERATION:
The model 652-163 is activated by turning one of the two on-off ball valves fully counter-clockwise. When the desired amount of
chemical water solution has been obtained turn the ball valve fully clockwise. Note: Do not use ball valves to throttle ch em ic al wat er
flow rate; this will result in inconsistent induction rates.
IV. SERVICING:
CAUTION: TURN OF F WATER SUPPLY BEFORE SERVICING.
A. Proportioner fails to draw chemical:
1. Proportioner outlet tubing cut too short for priming. Pinch outlet tube to create back pressure which will cause unit to
2. Insufficient water supply pressure. 20 psi is the minimum allowable pressure.
in the container.
prime. The foot valve will keep the inlet tube primed thereafter.
B. Proportioner stops drawing chemical:
1. Inspect foot valve for dried chemical or dirt. Soak in hot water to clean.
2. Prop ortioner inlet clogged with dr ied chemical. Remove metering top and tr y injecting in hot water. If there is no
suction, remove proportioner and soak in hot water to clear interior passages.
DEMA 652-163 DUO-FEED
I-571 Pg. 1 of 4
Rev. A-0600
Page 2
INSTALLATION INSTRUCTIONS
TABLE 1
4 GPM FLOW RATE PROPORTIONER
Injection Rates For Viscosities Shown
Metering Tip Color
Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio
Tan 0.25 512-1 0.20 640-1 0.15 853-1
Orange 0.33 388-1 0.25 512-1 0.20 640-1
Turquoise 0.50 256-1 0.35 366-1 0.25 512-1
Pink 0.75 171-1 0.50 256-1 0.40 320-1
Clear 1.00 128-1 0.65 197-1 0.45 284-1
Brown 1.13 114-1 0.75 171-1 0.50 256-1
Red 1.25 102-1 0.90 142-1 0.60 213-1
White 1.50 85-1 1.10 116-1 0.65 197-1
Green 2.00 64-1 1.25 102-1 0.70 183-1
Blue 2.25 57-1 1.45 88-1 0.75 171-1
Yellow 3.50 37-1 2.00 64-1 0.80 160-1
Black 5.00 26-1 2.20 58-1 0.85 151-1
Purple 8.40 15-1 2.50 51-1 0.90 142-1
Gray 11.00 12-1 2.70 47-1 0.95 135-1
No Tip 25.50 5-1 2.85 45-1 1.00 128-1
1cps 75 cps 200 cps
All dilutions based on 4 GPM flow at 40 psi. water pressure
RETURNS: NO MERCHANDISE MAY BE RETURNED FOR CREDIT WITHOUT DEMA’S WRITTEN
PERMISSION. RETURN MERCHANDISE AUTHORIZAT ION NUMBER REQUIRED I N ADVANCE
OF RETURN.
WARRANTY: DEMA products are warranted against defective material and workmanship under normal use and service for one
year 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 ca use d by chemicals, corr osi on, impr op er voltage s up p ly, physical
abuse, or misapplication. Rubber and synthetic rubber parts such as “o”- rings, diaphragms, squeeze tubing and
gaskets ar e cons idered exp endab le and ar e not cover ed under war ranty. This war ranty is extended only to the
original b uyer of DEMA products. If products a re altered or repair ed without prior ap proval 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 will be repaired or r eplaced 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.
DEMA 652-163 DUO-FEED
INSTALLATION INSTRUCTIONS
I-571 Pg. 2 of 4
Rev. A0600
Page 3
BALL VALV E (2)
OUTLET TUBE
SWIVEL ADA PTER
CHEMICAL SUPPLY TU BE
CHEMICAL SU PPLY TU BE
OUTLET TUBE
CHEMICAL
CONTAINER
FIG U R E 1
I-571 Pg. 3 of 4
Rev. A0600
Page 4
DEM A 652-163 DUO-FEE D
65-6
65-9
100-38
65-10
100-15
100-12
63-78
65-7
65-8
34-22-4
163C
65-7
65-8
34-22-4
150-6
163C
63-78
100-15
100-12
61-21
61-107-2
100-11P
PART NO.
34-22-4
61-21
61-107-2
65-6
65-7
65-8
65-9
I-571 Pg. 4 of 4
Rev. A0600
VACUUM BREAKER
VINYL T UBE (1/2 I.D . X 6' LG .)
CERAMIC WEIGHT (1/4" TUBE)
PLUG
1/4" BALL VALVE
ADAPTER
SWIVEL ADAPTER
DESCRIPTION
ACCESSORIES
100-15K
PART NO.
65-10
100-11P
100-12
100-38
150-6
163C
MET ER IN G TIP KI T- 14 SIZES (1/ 4" BARB)
GARDEN HOSE ADAPTER
FOOT VALVE
VINYL TUBE (1/4" I.D. X 8' LG.)
STRAINER WASHER
WASHER
4 GPM PROPORTIONER
DESCRIPTION
61-107-2
100-11P
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