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DAH "Dilution at Hand" Blend Centers
Warning: Use care when handling hazardous chemicals and use protective clothing/eyewear as recommended by Chemical Manufacturer.
The DAH "Dilution at Hand" blend center is a chemical/water solution dispensing system engineered to dilute
concentrated chemicals utilizing versatile controls and ASSE Standard 1055 Type B approved backflow
prevention devices with 1 and/or 4 GPM flow rate proportioners. Depending on the DAH blend center
equipment, the flow of inlet water and the desired mixture of chemical can be either activated by sliding a lift
button by hand, sliding the lever with the spray bottle, or depressing the trigger on the remote fill gun. Once the
valve control mechanism is activated, the water inlet valve opens allowing water to flow through the backflow
prevention device/proportioner that mixes a chemical/water solution at the desired induction rate with the use of
metering tips.
Bottle & Hose Fill Application: A return spring is used on the sliding lift button and sliding lever to prevent an
accidental overflow of chemical/water solution if unattended (Note: Unless the sliding lift button is in the
"Lock" position). To "Lock" the sliding lift button, slide the button all the way up then push it in towards the
wall. Slowly release the button and it will stay in the "Lock" position. To "Unlock" the button, the button
and/or the lever can be pushed upward to automatically release the locking mechanism.
Remote Fill Application: A return spring is used on the remote gun trigger to prevent an accidental overflow of
chemical/water solution if unattended (Note: Unless the trigger lock is in the "Lock" position). To "Lock" the
remote gun trigger, depress the trigger and slide the lock lever to the right. Slowly release the trigger and it will
stay in the "Lock" position. To "Unlock" the trigger, depress the trigger again to automatically release the
locking mechanism.
Sold by
I-776
Rev. G29208
700 SERIES
(Not all models are shown)
Owners Manual

Basic DAH Blend Center Operation

DEMA
Engineering Company, St. Louis, MO 63122 U.S.A.
Page 1 of 18

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Summary of Contents for DEMA 700 Series

  • Page 1: Basic Dah Blend Center Operation

    700 SERIES DAH “Dilution at Hand” Blend Centers (Not all models are shown) Owners Manual Basic DAH Blend Center Operation Warning: Use care when handling hazardous chemicals and use protective clothing/eyewear as recommended by Chemical Manufacturer. The DAH “Dilution at Hand” blend center is a chemical/water solution dispensing system engineered to dilute concentrated chemicals utilizing versatile controls and ASSE Standard 1055 Type B approved backflow prevention devices with 1 and/or 4 GPM flow rate proportioners.
  • Page 2: Getting To Know Your Dah Blend Center

    Getting to Know Your DAH Blend Center (Some models may not include all items listed below) Sliding Lift Button: The button controls the flow of a chemical/water solution through the outlet hose. The button can be locked for continuous flow by lifting the button all the way up then pushing it in towards the wall. Slowly release the button and it will stay in the “Lock”...
  • Page 3: Table Of Contents

    Product 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 that have a normal life shorter than one year or failure and damage caused by chemicals, corrosion, physical abuse, or misapplication.
  • Page 4: Unpacking And Checking Contents

    Unpacking and Checking Contents Table of Contents Item Description Blend Center or Blend Center/Rack Assembly Bag of Loose Parts (See table below) **Outlet Hose Chemical Supply Tube & Foot Valve Assembly DAH Owners Manual Drip Tray (Only supplied on some DAH Blend Center/Rack Models) Note: Save owners manual for servicing and parts information.
  • Page 5: Installing New Dah Blend Center/Rack Assembly To The Wall

    2. Laying out and drilling holes in the wall for mounting the DAH Blend Center: Carefully layout the proper mounting holes on the wall based on the information in step 1 on previous page using a tape measure and straight edge/level for hanging the blend center on the wall.
  • Page 6: Typical Dah Blend Center "Chemical Supply & Hose Installation

    2. Laying out and drilling holes in the wall for mounting the DAH Blend Center/Rack Assembly: Carefully layout the proper mounting holes on the wall based on the information in step 1 on previous page using a tape measure and straight edge/level for hanging the rack assembly on the wall.
  • Page 7: Metering Tips(S) Selection And Installation

    8. Outlet hose installation: Select and install the outlet hose(s) according to the proper sketch(s) as follows: Sketch Type of Backflow Prevention Proportioner Flow Rate Qty & Type of Device/Proportioner & Color of Proportioner Outlet Hose(s) “Action Gap”/Proportioner 1 GPM Green Single short hose “Action Gap”/Proportioner...
  • Page 8: Dah Blend Center Proportioner Induction Flow Rate Charts

    More viscous products (75cps – 200cps) may require larger 3/8” hose barbs and metering tips. If you are having difficulty achieving the ratio you require, call DEMA and ask for the technical department.
  • Page 9: Maintaining And Servicing Dah Blend Center

    Maintaining and Servicing the DAH Blend Center Caution: Turn off water supply before doing maintenance or servicing. Warning: Use care when handling hazardous chemicals and use protective clothing/eyewear as recommended by Chemical Manufacturer. This includes handling of chemical supply and outlet tubes. Note: Water supply pressure should be in the 20-125 psi range and water temperature must not exceed 150°F.
  • Page 10: Checking Backflow Prevention Device/Proportioner, Metering Tip(S), And/Or Foot Valves

    Checking backflow prevention device/proportioner, metering tip(s), and/or foot valve(s): Remove cover(s) and selector knob as necessary. Remove outlet hoses and chemical supply tubes as necessary. See section labeled “Disassembling & reassembling the remote fill hose assembly” on previous page for removing the remote fill hose assembly.
  • Page 11 Remove the valve body mounting screws from the base(s). Carefully slide the valve subassembly from the base(s) and set it on a clean and flat surface or table. (Note: Be careful not to separate the parts within the valve subassembly otherwise the o-rings will need to be removed and reassembled to avoid water leakage.
  • Page 12 One groove 15. Assemble one o-ring against the shoulder of the male Align innermost facing up boss feature for each connection needing to be groove for cap Align both grooves for reassembled as shown in detail “A”. (Note: Lube o- installation valve body installation CAP (Radial...
  • Page 13: Trouble Shooting

    Trouble Shooting (Some models may not include all items listed below) Water supply pressure should in the 20-125 psi range and water temperature must not exceed 150°F. See section labeled “Maintaining and Servicing the DAH Blend Center” on page 9 for more information. Trouble Probable Cause Remedy...
  • Page 14: Parts List For Dah Blend Center (Bottle/Hose Fill Applications)

    Parts List For DAH Blend Center (Bottle/Hose Fill Applications) (Some models may not include all items listed below) (Always order by part number) SEE FIGURE 2 FIGURE 1 SEE FIGURE 6 SEE FIGURE 7 FIGURE 2 NOTE: No Thru Hole 63-35 Magnet 98-4-1...
  • Page 15: Parts List For Dah Blend Center (Remote Fill Hose Assembly Application)

    Parts List For DAH Blend Center (Remote Fill Hose Assembly Application) (Some models may not include all items listed below) (Always order by part number) FIGURE 4 FIGURE 3 NOTE: Thru Hole (SEE FIGURE 5) High Pressure Tube (Blue) 98-5-2 Nut, Diaphragm 98-26-1 Diaphragm W/O center hole (EPDM)
  • Page 16 Parts List For DAH Blend Center (Some models may not include all items listed below) Always order by part number) 150-6 Rubber Washer 61-36 Flow Disk Proportioner Assembly (1 GPM) 61-99GAP-3 Proportioner Assembly (4 GPM) 61-22GAP-3 150-6-11 Rubber Washer 87-3-1 Nozzle 87-5-1 Diaphragm...
  • Page 17 Parts List For DAH Blend Center (Some models may not include all items listed below) (Always order by part number) #6 HI-LO Screw 58-60 63-111-2 Selector Knob 58-60 Screw, RD Head Retainer 63-100 63-104 Washer 63-101-2 Knob 63-51 Seal Ring 25-77 O-Ring (4 Req'd) 63-98...
  • Page 18: Parts List For Dah Rack Assemblies

    Parts List for DAH Rack Assemblies (Some models may not include all items listed below) (Always order by part number) Single Product Rack 98-105-1 Drip Tray 98-104-1 66-127 #12 Screw & Anchor Kit (Qty. 4 Each/Set) 98-103-1 #10 Screw, Washer & Nut Kit (Qty. 4 Each/Set) 98-112-1 Single Product Rack/Drip Tray Kit 98-90-1...

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