DEMA® MODEL 481-2
DUAL METERING KNOB WITH SOLENOID VALVES
INSTALLATION INSTRUCTIONS
I-767
Pg. 2 of 3
Rev. B-29542
TABLE 2
When the dual feed metering knob assembly 481-2 shown in
column 1 is assembled with a ‘C’ or ‘B’ series injector shown
in column 2 it will become the dual feed injector model
number shown in column 3.
NPT SIZE
203C
713
3/8”
204C
714
½”
206C
206CT
716
716T
¾”
203B
203B2V2
3/8”
204B
204B2V2
½”
481-2
206B
206B2V2
¾”
4.
SERVICING:
CAUTION: Turn off water supply and electricity before servicing.
The check valve parts are in the metering knob and can be cleaned by removing the four screws. The knob may be rotated if it is more
convenient to have the adjusting screws on another side of the injector. As with any injector, if spray jets become clogged or downstream
restriction increases in any manner, the injector will stop drawing fluid.
CAUTION: When servicing, make sure that replacement parts have been installed according to drawing. Be certain
to check that check valve parts are in place.
RETURNS:
NO MERCHANDISE MAY BE RETURNED FOR CREDIT WITHOUT DEMA’S WRITTEN
PERMISSION. RETURN MERCHANDISE AUTHORIZATION NUMBER REQUIRED IN
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 caused by chemicals, corrosion,
improper voltage supply, physical abuse, or misapplication. Rubber and synthetic rubber parts 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 will be repaired or replaced 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.