Knight Idex MX PLUS User manual

Page 1 of 12
0901220 Rev: A (final 04/20)
INSTALLATION
Mounting the unit
(1) Choose a convenient location close to water supply and not more than 5’ off floor.
(2) Remove the cover of the unit as the mounting holes are behind the cover.
(3) Hold the unit against the wall and mark keyholes (shown to the right) — use a
level for marking holes.
(4) Drill holes and install mounting anchors and screws (supplied).
(5) Hang the unit and tighten screws. Always refer to hardware manufacturer’s
specifications for weight capacity and usage.
(6) When reattaching the cover, be sure that the buttons line up properly with the tabs
on the water valves and that the dials (if used) are properly aligned.
Connecting the water supply
This proportioner operates best with a flowing water pressure of 30 - 60 PSI.
Fluctuating pressure can affect dilution ratios — use a water source that is not feeding
other equipment whenever possible. Water temperature should be between 40ºF and
140ºF.
(1) Attach male end of high pressure supply hose to inlet side of proportioner using a
garden hose washer. Water inlet can be located on the left side if necessary (see
optional water connections available, page 5).
(2) Attach female connector on high pressure hose to water source.
(3) Turn on water and check for possible leaks.
IMPORTANT NOTE:
If proportioner is connected to a janitor’s
sink with an atmospheric vacuum breaker, a
special connection kit is required by
A.S.S.E. specification 1055. Failure to use
this kit, or equivalent connection means, will
invalidate the A.S.S.E. and I.A.P.M.O.
(UPC) certification. Specify P/N 7600187
when ordering the kit.
CAUTION: Wear protective clothing and eyewear when dispensing chemicals or other
materials. Observe safety handling instructions (MSDS) of chemical mfrs.
CAUTION: When installing any equipment, ensure that all national and local safety and
plumbing codes are met.
SPECIFICATION MATERIAL SPECIFICATION
Flow rates 1 GPM (3.8 LPM) bottle fill
4 GPM (15.2 LPM) bucket fill
Back flow preventer Flex-gap or Aire-Gap
Max Temperature 140° F (60° C)
Optimal Min Pressure
Optimal Max Pressure 30 PSI (2 bar)
60 PSI (4 bar)
Cover ABS
Flex-gap Polypropylene
O-ring EPDM & Viton
Water Valve Acetal
Water Inlet Brass
MX PLUS
INSTRUCTION MANUAL
KNIGHT

0901220 Rev: A (final 04/20)
Page 2 of 12
OPERATION
Connecting the chemical supply
(1) Locate chemical container(s) below the proportioner.
(2) Insert the foot-valve end of the 3/8" vinyl tube into each container (use ceramic
weight if necessary to sink tube to bottom).
(3) For all ports, connect the inlet tube over the colored metering tip — secure with
a plastic zip tie.
Installing bucket-fill or bottle fill tube (optional)
(1) Connect the bucket or bottle fill tube with the flow restrictor (plastic insert) end
closest to the venturi body.
(2) Secure tube to venturi body with tie wraps provided.
Dispensing chemical-water mix
(1) Select the desired product with the selector knob (for dial operated units).
(2) Press the button on the front cover—release button when container is full.
(3) If desired, the button can be “locked” in the ON position for filling large
containers such as mop buckets or floor scrubbers. Simply push the latch into
the button when pressed in. To release, push latch away from button.
DIAL POSITION
The selector dial has 4 positions that correspond to the 4 chemical inlet ports (see
figure to the right). Labels can be applied to the cover of the unit to identify where
to point the dial for each particular chemical. When inserting metering tips, be sure
to match up the correct tip for the chemical that will be used on each port.
CHOOSING THE FLOW RATE
FLEX-GAP VENTURI
For the Flex-Gap systems, the flow rate is controlled by a venturi insert located
inside bottom of the Flex-gap housing.
WHITE Venturi insert (2200106) = 1 GPM
BLACK Venturi insert (2200105) = 4 GPM
To change the venturi insert.
(1) Remove the cover by gently snapping it away from the unit.
(2) Disconnect tubing from Flex-Gap housing.
(3) Twist the Flex-Gap housing counter-clockwise to remove it from the water valve
body.
(4) Push out existing venturi tube by inserting a pen up through the bottom of the
Flex-Gap housing (note the order of the parts as they are removed from the flex-
gap/venturi housing). See Figure 1
(5) Insert the new venturi insert (for the desired flow rate) into the Flex-Gap housing,
ensuring that it seats firmly. Place the flex-gap parts in the order removed from
the previous step.
(6) Twist the Flex-Gap housing clockwise to reattach it to the water valve.
Figure 1 (Flex-Gap Assembly)
Flex-gap housing
Venturi Insert
PEN
Stem
Sleeve
1
2
3
4

Page 3 of 12
0901220 Rev: A (final 04/20)
METERING TIP CHART (Flex-Gap & Aire-Gap Venturi)
1 GPM 4 GPM
TIP COLOR OZ/GAL RATIO OZ/GAL RATIO
NO INSERT
WHITE 30.00 4.3:1 14.00 9.1:1
YELLOW 29.00 4.4:1 13.00 9.8:1
PINK 27.00 4.7:1 11.00 11.6:1
GREEN 24.00 5.3:1 9.00 14.2:1
BLACK 20.00 6.4:1 7.00 18.3:1
BROWN 14.00 9.1:1 5.00 25.6:1
GRAY 10.00 12.8:1 4.00 32.0:1
BLUE 8.00 16.0:1 3.00 42.7:1
RED 6.00 21.3:1 2.00 64.0:1
PEACH 5.00 25.6:1 1.50 85.3:1
LT BLUE 4.00 32.0:1 1.25 102.4:1
PURPLE 3.00 42.7:1 1.00 128.0:1
LT GREEN 2.00 64.0:1 0.75 170.7:1
ORANGE 1.00 128.0:1 0.50 256.0:1
LT BROWN 0.50 256.0:1 0.25 512.0:1
This chart is based upon the chemical
viscosity of water (CPS = 1.0) and should
only be used as a guide. Actual ratios and
flow rates may vary due to product
viscosity, flow pressure, and tubing
distance.
CHOOSING DILUTION RATES
METERING TIP SELECTION
The dilution chart for Flex-Gap and Aire-Gap venturi are the same for both 1
GPM and 4 GPM flow rates. For each valve in the system, install appropriate
metering tip from the chart below. Be sure the metering tip is threaded in
hand-tight only.
CALIBRATING ACTUAL PRODUCT RATIOS
To easily calculate the ounces per gallon for a specific product:
(1) Fill a graduated cylinder, or bottle (that has ounce markings) with product.
(2) Install metering tip closest to the desired ounces per gallon — see dilution
charts.
(3) Drop chemical pick-up tube into the container holding the product.
(4) Activate valve until chemical line is primed up to the metering tip.
(5) Note how many ounces (of product) are in the container.
(6) Activate valve again and fill a one gallon container with water/product mix.
(7) Note how many ounces (of product) were used.
(8) You now have determined actual ounces per gallon for this product.
Figure 2 (Aire-Gap Assembly)
AIRE-GAP VENTURI
For Aire-Gap venturi systems, the flow rate is controlled by a nozzle, deflector plate, and venturi insert. These internal parts
are color coded to identify their GPM rating: Aire-Gap Nozzle: LIGHT GREY = 1 GPM / LIGHT BLUE = 4 GPM Splash
Deflector & Venturi tube: WHITE = 1 GPM / BLACK = 4 GPM. To change the Aire-Gap venturi:
(1) Remove the cover by gently snapping it away from the unit. Disconnect tubing from Aire-gap housing.
(2) Twist and disconnect Aire-Gap housing counter-clockwise to remove water valve body.
(3) Remove existing nozzle, deflector plate, and venturi tube by disassembling the Aire-Gap assembly — See Figure 2.
(4) Reassemble the Aire-Gap using new nozzle, splash deflector, and venturi tube (for the desired flow rate). To avoid
leakage, install the rubber washer with the ribs facing upwards.
(5) Put Aire-Gap assembly back in place in the order that parts were removed.
(6) Twist and reconnect Aire-Gap assembly back onto the water valve body.

0901220 Rev: A (final 04/20)
Page 4 of 12
CONNECTING MULTIPLE UNITS
• Multiple units can be connected side by side using the quick connector (7366049) for any configuration that is required.
See Figure 3
• Water inlet connection can be relocated from right to left side if necessary by following the steps below.
(1) Remove the brass inlet fitting from the right side by turning it counter-clockwise (Figure 4).
(2) Remove the plastic plug from the left side by turning it counter-clockwise.
(3) Insert the brass inlet fitting into the left side by turning it clockwise until hand-tight and the flats are aligned.
(4) Insert the plastic plug into the right side by turning it clockwise until hand-tight and the flats are aligned.
DILUTION
DYNAMIC WATER PRESSURE
30 PSI
40 PSI
50 PSI
1 GPM
512:1
P/N 2201221-35
P/N 2201221-30
P/N 2201221-25
4 GPM
512:1
P/N 2201221-05
P/N 2201221-05
P/N 2201221-05
750:1
P/N 2201221-10
P/N 2201221-10
P/N 2201221-10
935:1
P/N 2201221-15
P/N 2201221-15
P/N 2201221-15
1400:1
P/N 2201221-25
P/N 2201221-25
P/N 2201221-25
TORTUOUS PATH METERING DEVICE (TPMD)
Many sink sanitizers and concentrated cleaning products require dilution rates that exceed 250 to 1. For these products, the
TPMD was developed to meter precise amounts of chemical to water without plugging, and with unparalleled accuracy.
Dilution rates range from 250:1 to 1500:1 with the Flex Gap or Aire Gap backflow preventers. The following table will guide
your selection of the TPMD that suits your needs. Tortuous paths metering devices are optional items.
Note: Mixing Ratios should be used for reference only. Ratios and flow rate will vary depending on water pres-
sure, chemical viscosity, and length of chemical lines.
Figure 3
Figure 4

Page 5 of 12
0901220 Rev: A (final 04/20)
Part Number DESCRIPTION
0300519 Ceramic Tube Weight
0901220 Manual
0300121 3.5” Cable Ties
2201200 Metering tip kit with chart
2201225 Umbrella Foot Valve
7025842 Pick-up Tube, T-38V Vinyl 1/4" ID x 3/8"
OD 6 ft.
7026905 6’ Chemical Discharge Tube w/ restrictor,
(Flex-gap bucket fill hose)
7026905-16“ Chemical Discharge Tube w/ restrictor,
(Flex-gap bottle fill hose)
1202012 Chemical Labels
7600121 Mounting Kit w/ #10 Screws and anchors -
2 ea
SAFETY AND SERVICING TIPS
• Avoid direct contact with chemicals — handle containers with caution. To avoid spillage, be careful not to tip containers.
• Insert chemical suction line into container so that footvalve and ceramic weight sink to the bottom.
• If valve fails to draw chemical, check the metering tip and footvalve for blockage — soak in warm water to clear.
TROUBLESHOOTING
1. Proportioner will not draw chemical:
A. Check metering tip for obstruction.
B. Check water pressure for 30 – 60 PSI.
C. Check or change footvalve.
2. Proportioner leaks at joints:
A. Ensure that there are two o-rings in place and in good condition on
each end of connector.
3. Mixed chemical concentration is too weak:
A. Check water pressure for a minimum of 25 PSI of flow pressure.
B. Change metering tip to a higher dilution ratio.
4. Supply line loses chemical prime:
A. Check or change foot valve.
5. Water leaks at cap on valve assembly:
A. Check that cap is fully turned clock-wise and tight.
B. Check for debris or damage to valve tab assembly
C. Excessive water pressure. Use Regulator.
6. Button activator will not activate valve:
A. The cover is loose or damaged, snap on cover or replace the cover.
B. Adjust calibration screw until full flow is achieved. See Figure 5
7. Dial 4 will not draw chemical:
A. Check condition of o-ring on dial selector knob. See Figure 6
B. Ensure Dial “Clicks” to selected product.
8. Low water flow:
A. Check that diaphragm cover is firmly attached.
B. Check for sediment in screen washer or valve body.
C. Check water pressure.
Figure 5
Figure 6
O-ring
Calibration
screw
ACCESSORY KIT PARTS (NOT SHOWN)
Note: Quantities and variations of the items will vary
depending the system ordered.
Part Number DESCRIPTION
6400006 Metering tip wrench
7366041-25 Quick Water Connection, Hose Swivel-
US, 25 each
7366040-25 Quick Water Connection, Hose Swivel-
UK, 25 each
0600873-10 Quick Connect, 3/8" John Guest Elbow,
10 each
0600874-10 Quick Connect, 3/8: Compression, 10
each
7366035 Quick Connect, 1/2" barb, 25 each
7366049 Quick Connect Valve Connector
OPTIONAL ITEMS

0901220 Rev: A (final 04/20)
Page 6 of 12
SINGLE ENGINE PARTS DIAGRAM

Page 7 of 12
0901220 Rev: A (final 04/20)
DUAL ENGINE PARTS DIAGRAM

0901220 Rev: A (final 04/20)
Page 8 of 12
TRIPLE ENGINE PARTS DIAGRAM

Page 9 of 12
0901220 Rev: A (final 04/20)
FLEX-GAP ANNUAL CLEANING AND TEST PROCEDURES FOR UNITS INSTALLED IN CANADA
Each year, your chemical dispenser must be cleaned and its backflow prevention performance verified. As this device is an
end-of-line device (versus an in-line device) and evidence of effective backflow prevention is determined visually, a two-
minute pressure test is not necessary.
If the Flex-Gap device cannot readily be seen during the test procedure, the housing of the chemical dispensing unit must be
removed during testing. Apply the appropriate test procedure below as applicable for your chemical dispensing unit.
4 GPM VENTURIS
1. Fill discharge hose with water by opening the valve.
2. When water begins to exit the discharge hose turn off the water and raise the end of the hose above the Flex-Gap.
3. Observe that water is exiting the Flex-Gap.
4. If the water is exiting the Flex-Gap it has passed the test.
5. If the water is not exiting from the Flex-Gap, replace the Flex-Gap sleeve as per the instruction manual and re-test.
6. If the water is not exiting from the Flex-Gap after replacing the sleeve and re-testing, replace the complete Flex-Gap
assembly and re-test.
7. If the water is not exiting from the Flex-Gap after replacing the Flex-Gap assembly, disconnect the water supply and
replace the complete unit.
1 GPM VENTURIS
1. Remove the Fill Tube Spout and replace with a 4-foot length of 1/2” ID hose.
2. Fill the discharge hose with water by opening the valve.
3. When water begins to exit the discharge hose, turn off the water and raise the end of the hose above the Flex-Gap.
4. Observe that water is exiting the Flex-Gap.
5. If the water is exiting the Flex-Gap, it has passed the test.
6. If the water is not exiting from the Flex-Gap, replace the Flex-Gap sleeve and re-test.
7. If the water is not exiting from the Flex-Gap after replacing the sleeve and re-testing, replace the complete Flex-Gap
assembly and re-test.
8. If the water is not exiting from the Flex-Gap after replacing the Flex-Gap assembly, disconnect the water supply and
repace the complete unit.

0901220 Rev: A (final 04/20)
Page 10 of 12
NOTES

Page 11 of 12
0901220 Rev: A (final 04/20)
NOTES

0901220 Rev: A (final 04/20)
Page 12 of 12
DISCLAIMER
Knight LLC does not accept responsibility for the mishandling, misuse, or non-performance of the described items when used
for purposes other than those specified in the instructions. For hazardous materials information consult label, MSDS, or Knight
LLC. Knight products are not for use in potentially explosive environments. Any use of our equipment in such an environment
is at the risk of the user, Knight does not accept any liability in such circumstances.
WARRANTY
All Knight controls and pump systems are warranted against defects in material and workmanship for a period of ONE year. All
electronic control boards have a TWO year warranty. Warranty applies only to the replacement or repair of such parts when
returned to factory with a Knight Return Authorization (KRA) number, freight prepaid, and found to be defective upon factory
authorized inspection. Bearings and pump seals or rubber and synthetic rubber parts such as “O” rings, diaphragms, squeeze
tubing, and gaskets are considered expendable and are not covered under warranty. Warranty does not cover liability resulting
from performance of this equipment nor the labor to replace this equipment. Product abuse or misuse voids warranty.
FOOTNOTE
The information and specifications included in this publication were in effect at the time of approval for printing. Knight LLC
reserves the right, however, to discontinue or change specifications or design at any time without notice and without incurring
any obligation whatsoever.
Knight Headquarters
Tel: [phone]
Fax: [phone]
USA Toll Free
Tel: [phone]
Knight Canada
Tel: [phone]
Fax: [phone]
KNIGHT LLC (www.knightequip.com)