Dema P203C Installation Manual

DEMA MODELS P203C, P203CP, P203CT, & P203CTC

I. PARTS:

A. Injector.
B. 1 pc. Foot Strainer & 1/4" I.D. Tubing.
C. 1 pc. Ceramic Weight.

II. INSTALLATION:

A. Water Supply.

The water inlet and outlet is 3/8" NPT pipe.

WARNING: Water supply should not exceed 125 psi and water temperature must not exceed 150°F.

B. Pos s ib le Outlet Connections .

The outlet can b e pipe or hose. To connect a dis charge hose to the outlet a garden hose fitt ing will be needed. Spray
guns, spray nozzles or foaming wands may be used on the hose outlet, note that this Injector is designed to operate with a
total spray nozzle flow rating of no less than 4 GPM total at 40 PSI. When a spray gun or nozzle is used, hose lengths
must not exceed those shown in Table 1. Hoses, spray guns and foam wands are available through Dema. See the parts
list on page 4, under Optional Accessories for various styles.

INSTALLATION INSTRUCTIONS

TABLE 1

Hose I.D. 3/8" 1/2" 5/8"
Max. Length 15 ft. 50 ft. 100 ft.

C. Placement in the Water Line.

The injector may be placed in a horizontal or vertical line and with the metering knob in any position below, above, or to
the side. Water flow must be in the direction of the arrow on the injector body. If the injector pipe size is different from
the line size, use pipe bushings or reducers as required. (Injector selection is based on flow not pipe size.)

D. Chemical Supply.

WARNING: USE CARE WHEN HANDLING HAZARDOUS CHEMICALS.

Place the chemical container in a convenient location not more than six feet below the Injector. (Greater lifts will reduce
injection capabilities). The top of the container should not be above the injector. Cut the vinyl tube to any convenient
length that will allow the tubing to reach the bottom of the container. Drop the tubing end with the strainer and ceramic
weight into the chemical container. Push the other end of the tubing over the chemical inlet barb.

III. FEED RATE ADJUSTMENT:

A. Model P203C and P203CP (with Metering Screw).

See page 4 for the location of the metering screw in the metering knob. The maximum and minimum injection rates are
shown in Table 2. Turn the screw all of t he way in for the minimum injection rate and five turns counterclockwise for
maximum rates.

Viscosity, (cps) 1 75 200
oz/gallon (minimum) 0.33 ----- -----

oz/gallon (maximum) 12.80 3.50 1.55

All injection rates are based on 40 PSI inlet water pressure and a water flow rate of 2.5 GPM.

TABLE 2

B. Model P203CT & P203CTC (with Metering Tips).

The chemical feed rate is controlled by a metering tip screwed into the metering barb on the side of the u nit. Th e fe e d ra tes
can be changed by using a different size metering tip which is available through Dema (See parts list o n pag e 4). To se le ct
a proper size metering tip for the desired dilution ratio refer to Table 3.

I-435 Pg. 1 of 4
Rev. A0600

DEMA MODELS P203C, P203CP, P203CT, & P203CTC

INSTALLATION INSTRUCTIONS

TABLE 3

DEMA MODEL P203CT & P203CTC

METERING TIP SELECTION CHART

INJECTION RATES USING METERING TIPS (100-15)

Injection Rate for Viscosities Shown

1 cps 75 cps 200 cps

Metering Tip Color
Tan 0.40 320-1 0.25 512-1 0.20 640-1

Orange 0.50 256-1 0.35 366-1 0.25 512-1
Turquoise 0.75 171-1 0.45 284-1 0.35 366-1
Pink 0.95 135-1 0.65 197-1 0.45 284-1
Clear 1.30 98-1 0.80 160-1 0.55 233-1
Brown 1.50 85-1 0.90 142-1 0.60 213-1
Red 1.90 67-1 1.00 128-1 0.70 183-1
White 2.25 57-1 1.30 98-1 0.80 160-1
Green 2.64 49-1 1.50 85-1 0.90 142-1
Blue 3.20 40-1 1.75 73-1 1.00 128-1
Yellow 4.85 26-1 2.25 57-1 1.10 116-1
Black 6.50 20-1 2.40 53-1 1.15 111-1
Purple 9.20 14-1 2.70 47-1 1.20 107-1
Gray 10.40 12-1 2.85 45-1 1.25 102-1
No Tip 12.80 10-1 3.50 37-1 1.55 83-1

Oz/Gal Ratio Oz/Gal Ratio Oz/Gal Ratio

All injection rates are based on 40 PSI inlet water pressure and a water flow rate of 2.5 GPM.

IV. SER VICING:

CAUTION: TURN OFF WATER SUPPLY BEFOR E SERVICING.

A. If unit fails to draw chemical.

1. Is the hose too long? (See Table 1)

2. Is the gun or nozzle(s) sized properly? (Refer to Section II B). Remove gun and/or nozzle(s) and turn on water. If
the injector inducts chemical, the gun and nozzle(s) are improperly sized.

3. Is the metering tip blocked? Remove tip and clear blockage. (P203CT & P203CTC Only)

4. Is the meterin g screw backed off? (Refer to Section III A). (P203C & P203CP Only)

5. Is the hose kinked or otherwise obstructed?

6. Is the spray gun or foam wand fully open?

B. If unit stops drawing che mical.

1. Is the foot strainer clogged? Lift from drum and clean.

2. Are the spray nozzle(s) partially clogged? Remove and clean.

3. Is the metering tip blocked? Remove and clean. (P203CT & P03CTC Only)

4. Is the metering screw clogged? (P203C & P203CP Only)

5. Is the injector check valve clogged? Remove square, plastic metering knobs to inspect check valve ball, spring and

O-ring.

CAUTION: WHEN SERVICING UNIT BE SURE THAT R EPLACEM ENT PARTS HAVE BEEN INSTALLED

ACCORDING TO DRAWING. BE CERTAIN CHECK VALVE PARTS ARE IN PLACE.

I-435 Pg. 2 of 4
Rev. A0600

DEMA MODELS P203C, P203CP, P203CT, & P203CTC

INSTALLATION INSTRUCTIONS

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 ca use d by chemicals, corr osi on, impr op er voltage s up p ly, physical
abuse, or misapplication. Rubber and synthetic rubber parts such as “o”- rings, diaphragms, squeeze tubing and
gaskets ar e cons idered exp endab le and ar e not cover ed under war ranty. This war ranty is extended only to the
original b uyer of DEMA products. If products a re altered or repair ed without prior ap proval 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 r eplaced 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.

I-435 Pg. 3 of 4
Rev. A0600

DEMA MODELS P203C, P203CP, P203CT, & P203CTC

INSTALLATION INSTRUCTIONS

24-67

100-15-

SPECIFY COLOR

PART NO.

24-11MP
24-23
24-24P
24-25
24-25S
25-29
25-29S
24-32

100-12

61-107-2

24-11MP

DESCRIPTION

FOOT STRAIN ER

CHECK VALVE SPRING
CHECK VALVE BALL
CHECK VALVE O-RING
CHECK VALVE O-RING (P203CTC)
O-RING
O-RING (P203CTC)
METERING KNOB (P203C & P203CP)

PART NO.

24-32T
24-34
24-67
24-68

61-107-2
100-12
100-15­100-24

100-24

24-25
24-25S

24-24P

24-23

24-34

25-29
25-29S

DESCRIPTION

METERING KNOB (P203CT & P203CTC)
CHECK VALVE CORE

SCREW (1" LG 4- REQD.)

VALVE BODY

CERAMI C WEIGHT
VINYL TUBING (1/4" ID X 8' LG)
METERING TIP (SPECIFY COLOR)
METE RING SCREW

24-32
24-32T

24-68

I-435 Pg. 4 of 4
Rev. A0600