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D
EM
A
INSTALLATION INSTRUCTIONS
1. PARTS
A. Pump as sembly
B. 8 ft. of 1/4" OD vinyl tubing with foot strainer
C. Metering orifices #3 and #7
2. INSTALLATION
A. Mountin g –
1) Direct mounting in rinse line: (See Fig. 1). Drill the rinse line with an R (.339 dia.) drill and tap 1/8 NPT. The
location must be downstream from the siphon breaker. Most plumbing codes require it to be 6" below the
breaker. If the piping is too thin for tapping, a 1/8 NPT saddle fitting may be used (Dema Part No. 25-37). The
excess white tubing shou ld b e cut to allow at least 1/8" extension beyond t he end of the fitting, including the
saddle fitting is used. Loosen the Locking Set Screw and pull the water inlet assembly from the pump along with
the white 1/8" OD tubing, retainer washer, spring and o-ring. Screw water inlet assembly into the rinse line and
push the pump body over the other end, making sure the spring and tubing are in p lace. The pump body may be
swiveled to any position before locking the set screw.
2) Remote Mounting: The pump may be mounted on any surface up to 4 feet away from the rinse line by means of
mounting bracket and coaxial impolene tubing with fittings. Ask for Dema Kit No. 26-1.
WATER-ACTUATED RINSE FLUID PUMP
DEMA MODEL 261
For stationary-Rack Dishwashing Machines
Operating at a Rinse Spray Pressure of 5 to 25 PSI
B. Rinse Supply Tubing Connection -- Drop the end of the vinyl tubing with the strainer into the rinse fluid container,
cut tubing to convenient length, and slip the open end onto the pump inlet fitting. (The end of the tubing may be
softened by imme rsi o n i n h ot water).
3. OPERATION:
The pump is operated by rinse line pressure. When the rinse valve is actuated, pumping action will commence and is
indicated by the movement of the indicator rod at the end of the pump. When the rod reaches the end of its str oke,
pumping stops. To rest the pump, the rinse valve must be turned off to allow rinse line pressure to drop to zero. To
prime the pump, turn the rinse valve on and off until rinse fluid reaches the pump.
4. ADJUSTMENT:
WARNING: Use care when handl ing hazardous chemicals.
The pump is adjustable up to 1/2 cc/ min feed rate based on a 12-second rinse cycle. The distance the indicator rod has
protruded at the end of the rinse cycle indicates the rate at which fluid has been injected. Each line indicates a rate of 2
cc/min. This rate is controlled by an orifice in the water inlet assembly. The inlet fitting is equipped with a #5 (.018 dia.)
metering orifice. The injection rate will depend on line pressure. If more or less fluid is needed, a larger or smaller
orifice should be used. See Table 1. Remove the knurled cap with filter screen from the water inlet assembly, and use a
screwdriver to replace the orifice. See Figure 1.
If the feed ra te required is unknown, then this must b e judged by obs erving the condition of the dishes as they leave the
machine.
I-139
Rev. A0600
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Page2 of 4
WATER-ACTUATED RINSE FLUID PUMP
DEMA MODEL 261
For stationary-Rack Dishwashing Machines
Operating at a Rinse Spray Pressure of 5 to 25 PSI
5. SERVICING
TABLE 1
CAUTION: Turn off water supply before
servicing.
Failure to pump or pr ime may be caused by:
A. Low rinse line pressur e. 5 PSI minimum required
at the pump
.
B. Clogged strainer screen in rinse fluid reservoir.
Clean.
RINSE
LINE
PRESSURE
ORIFICE SELECTION
CC\MIN INJECTION RATE FOR
ORIFICE NUMBERS SHOWN
PSI
5 2 3 4
#3 #5 #7
C. Dirt or dried rinse fluid in inlet, check valve.
Remove knurled knob from end of pump and
inspect b all, spr ing and o -ring.
D. Clogged strainer screen in water inlet fitting.
Clean.
7 3 5 8
10 5 7 12
15 7 10 20 8 12 -
CAUTION: When servicing unit, be sure that replacement parts have been installed according to drawing. Be
certain check valve parts are in place.
INDICATOR ROD
ROD MOVEMENT INDICATES OPERATION
DEMA
MODEL
261
RINSE
PUMP
AND INJECTION AMOUNT
SCREW - BACK OUT FULLY
I-139
Rev. A0600
ORIGI NAL ADJESTING
SET
SCREW
WATER
INLET
ASSEMBLY
1/8" MINIMUM
EXTENSION
RINSE
LINE
METERING
ORIFICE
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WATER-ACTUATED RINSE FLUID PUMP
DEMA MODEL 261
For stationary-Rack Dishwashing Machines
Operating at a Rinse Spray Pressure of 5 to 25 PSI
RINSE
FLUID
CONTAINER
VINYL
TUBING
FIGURE 2
SIPHON
BREAKER
RINSE
VALVE
RETURNS: NO ME RCHANDI SE MAY BE RETURNED FOR CREDIT WITHOUT DEMA’S WRITT EN
PERMISSION. RET URN MERCHANDISE AUTHORIZATION NUMBER REQUI RED IN
ADVANCE OF RETURN.
WARRANTY: DEMA products are warr anted against defective material and workmanship under normal use a nd
service for one year from the date of manufacture. This limited warranty does not apply to any
products which have a nor mal life shorter than one year or failure a nd damage caused by chemicals,
corrosion, improper voltage supply, physical abuse, or misappl ication. Rubber and synthet ic rubber
parts such as “o”- rings, diaphragms, squeeze tubing and gaskets are cons idered expendable and are
not covered under warranty. This warranty is extended only to the original buyer of DEMA
produ ct s. I f p r odu ct s ar e a lt er ed or r epa ir ed withou t p r ior a p pr ova l o f DE M A, t his wa r ra nt y w ill b e
void.
Def ectiv e unit s or p art s shoul d be r etur ned to t he fa ctor y with t ra nspor tat ion pr epai d. If i nspect io n
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, mu st b e granted in advance of return.
I-139
Rev. A0600
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HYDRAULIC RINSE PUMP, MODEL 261, AND KIT 26-1
26-20
26-29
26-13
26-12
26-11
26-10
26-21
26-15
24-10
ACCESSORY
26-16
26-2
26-22
26-19
26-18
26-3
26-30
26-27
26-28
26-24
26-60
26-61
26-4
26-9
26-25
26-26
26-5
25-36-3
26-8
25-29
26-14
24-23
24-24P
26-6
26-17
24-25
26-4-2
26-7
24-11SP
PART NO.
24-10
24-11SP
24-23
24-24P
24-25
24-29
25-36-3
25-37
26-1
26-2
26-3
26-4
26-4-2
26-5
26-6
26-7
26-8
26-9
26-10
26-11
26-12
26-13
25-37
DESCRIPTION
8' Lg. 1/4" O.D. Plastic Tubing
Foot Strainer
Spring
Ball
O-Ring
O-Ring
1/4" OD x 4' Long Impolene Tubing
Saddle Clamp Fitting (accessory part)
Kit for Remote Mounting
Plug with O-Ring
Metering Oriface - Specify Size
Tubing and Clamp Assembly
Impolene Tubing Assy
Tube Clamp Spring
Inlet Fitting with O-Ring
Check Valve Knob
Check Valve Core with O-Ring
Piston Assembly
Diaphragm
Power Piston
Indicator Rod
Power Spring
KIT 26-1
PART NO.
26-14
26-15
26-16
26-17
26-18
26-19
26-20
26-21
26-22
26-24
26-25
26-26
26-27
26-28
26-29
26-30
26-60
26-61
26-62
26-63
26-64
26-63
26-62
DESCRIPTION
Set Screw
Washer H ead Screw
Nut
O-Ring
O-Ring
Gasket
Nut
Washer
Buffer P late
Pump Body with Center Seal
U-Cup
Piston Nut
Piston Plate
Stem
Power Cylinder
Metering Screw (not shown)
Stem Guide
O-Ring
Compression Fitting - MPT
Compression Fitting - FPT
Mounting Bracket w/screws
26-64
I-139
Rev. A0600
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