Taco 3350-T3 Installation Guide download pdf (Page 2)

Installation:

1. Install the valve in the direc-

tion indicated by the flow

arrows on the body. The

valve can be installed in any

orientation. Rotate the set

point indicator so that the

pressure setting is always

visible (figure 1).

2. The 3350 PRV connects via a

⁄

" NPTF on the outlet and

may be connected using either

the

⁄

" NPTF or the Taco union

threads on the inlet. The Taco

union threads are more com-

monly used on existing installations already connected

by a union nut. To use the union connection, remove the

plastic thread protector on the valve inlet and connect

the existing union nut. Replace the old union gasket with

the new one supplied with the 3350.

Note: This product should be installed by profession-

als familiar with the correct function and performance

of hydronic heating systems and their associated

components.

Caution: Protect the 3350 from freezing and exposure

to chemicals or solvents.

Adjusting the Set Presure:

1. Turn the green locknut counter clockwise to loosen

(figure 2).

2. Turn the adjustment knob (figure 3) counter clockwise to

reduce pressure or clockwise to increase the pressure

until the indicator points to the desired pressure setting.

3. The PRV does not release pressure. When adjusting

to a lower setting any excess pressure will need to be

released through a suitable release point. Turn the

green locknut clockwise until finger tight.

Fast Fill:

The 3350 is equipped with an

automatically resetting fast fill fea-

ture. The fast fill overrides the set

pressure during filling and purging

of the system. To activate the fast

fill simply push in the button

marked fast fill located on top of

the PRV (figure 4). When the set

pressure is reached the fast fill

button will pop out. The valve is

now out of the fast fill mode and

back into the normal operating

mode.

NOTE: If the fast fill button is unintentionally pushed in

prior to installation it may be returned to the normal

operating mode as follows.

1. Unscrew and remove the lock knob carefully so as not

to lose the spring.

2. If the spring is still inside the lock knob remove it.

3. Using a suitable tool, such as a small screwdriver or pen,

reach inside the lock knob and push the button back out.

4. Put the spring back into the lock knob and screw the

knob back onto the cartridge.

Maintenance:

To clean the integrated strainer in

the pressure reducing valve, close

the isolating valve upstream of the

unit. Remove the PRV cartridge by

turning the black 8 point cam nut

on the cartridge counter clockwise

and pull out. Clean with water

only. Reverse the procedure to

install (figure 5).

Caution: Do not over tighten the

cartridge as this may damage

the threads in the new cartridge

or in the valve body and require

that they be replaced.

Application:

Taco’s PRV (Boiler Feed Valve) is designed for use in

today’s Hydronic heating systems. The model 3350 PRV

reduces incoming pressure and automatically maintains

the system pressure to the valve’s adjustable set point.

If the system pressure drops below the valve’s set point

it will automatically add water to the system. It is suitable

for systems with fill pressure requirements between

10-50 PSI. The Taco PRV showcases a fast fill button

with automatic reset. The valve automatically exits the

fast fill mode once the system is full and the desired set

pressure is reached. No more manually holding the valve

open or locking it in an open position, possibly over

pressurizing to the point of setting off the relief valve.

Installation Diagram:

Figure 2

–+

Figure 3

Figure 4

Figure 5

4.3" (110 mm)

2.0"

(51 mm)

removal

space

⁄4-14 UNS-2A

⁄2-14 NPT

0.7"

(17.8 mm)

1.5"

(38.1 mm)

3.5"

(90 mm)

0.7"

(17.8 mm)

⁄2-14 NPT

Dimensions:

360°

Figure 1

1 2

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