DEMA BLEND CENTER
MODELS 633MB, 633MB2
I-606
Pg. 1 of 4
Rev. B-36300 11/23/10
1. PARTS:
A. Blend Center assembly
B. 1 pc. 8’ long vinyl supply tubing with foot valve
C. 1 pc. Ceramic weight
1/4” ID, Model 633MB2; 3/8” ID, Model 633MB
D. 3 pcs. ea. #8x1-1/2” screws and anchors
E. 1 pc. label card
F. Metering tip kit
G. 1 pc. 1/4” NPT Garden Hose bushing
H. 1 pc. Hose clamp
I. Ball Valve (633MB2 only)
2. INSTALLATION:
This product is designed only to be used as described in this instruction sheet. Adhere to all warnings and
cautions identified in this document.
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.
A)
Mounting and Water Supply:
Remove the two cover retainer screws and the cover from the blend center assembly. Hold the unit to the wall and locate the
positions for the mounting screws. Mount the unit to the wall using 2 mounting screws and anchors, and replace the covers
and screws.
The water inlet is equipped with a female garden hose fitting (with strainer washer) for attaching a water supply hose. 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 OVERTIGHTEN.
B) Chemical Injection Adjustment:
WARNING: USE CARE WHEN HANDLING HAZARDOUS CHEMICALS.
Chemical feed rates are controlled by a metering tip screwed into the injector barb. Select a tip for the barb using Table 1 as
a guide.
633MB2 only: Screw ball valve onto inlet of injector.
C) Chemical Supply:
Place the chemical container in a convenient location not more than 6 feet below the blend center (greater lifts will reduce
injection capacity). Slip ceramic weight over tubing and insert the end with the foot valve into the chemical container. Cut
the tubing to any convenient length that will allow it to extend from the bottom of the chemical container to the injector inlet
barb (See figure 1). Gummed labels are provided for labeling chemicals.
D) Outlet:
Screw outlet hose (not provided) onto outlet of injector using the bushing. Squeeze hose clamp around hose. Locate
position for mounting screw and mount hose clamp to wall using remaining screw and anchor.
3. OPERATION:
The blend center is now ready for use. Depressing the push button opens the valve, allowing water to flow through the chemical
injector that mixes chemical at the desired rate. The button is spring loaded to prevent accidental overflow 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 turning 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 counterclockwise direction will release it, allowing the valve to shut off.
CAUTION: WHEN SERVICING UNIT BE SURE THAT REPLACEMENT PARTS HAVE BEEN INSTALLED
ACCORDING TO DRAWING. BE CERTAIN CHECK VALVE PARTS ARE IN PLACE.
4. SERVICING:
CAUTION: TURN OFF WATER SUPPLY BEFORE SERVICING.
A.
If unit fails to draw chemical. 1. Is the hose too long? (See Table 2)
2. Is the metering tip blocked? Remove tip and clear blockage. 3. Is the hose kinked or otherwise obstructed?
