Taco | 3350-T3 | Installation guide | Taco 3350-T3 Installation Guide

Submittal Data:
Maximum Inlet Pressure:
Adjustment Range:
Maximum Temperature:
Factory Setting:
Media:
Materials of Construction:
Body
Cartridge Wetted Parts
Instruction Sheet
250 psi
10 – 50 psi
210°F
12 psi
Water
102-107
Cartridge Pressure Reducing Valve (PRV)
SUPERSEDES: January 2008
Plant ID# 001-3941
EFFECTIVE: January 1, 2010
Forged Brass
Stainless Steel,
Engineered Plastics,
Bronze, EPDM Seals
Replacement Cartridge:
LIMITED WARRANTY STATEMENT
Cartridge Assembly
Part Number:
3350-005 RP
Taco, Inc. will repair or replace without charge (at the company’s option) any
product or part which is proven defective under normal use within one (1)
year from the date of start-up or one (1) year and six (6) months from date
of shipment (whichever occurs first).
In order to obtain service under this warranty, it is the responsibility of the
purchaser to promptly notify the local Taco stocking distributor or Taco in
writing and promptly deliver the subject product or part, delivery prepaid, to
the stocking distributor. For assistance on warranty returns, the purchaser
may either contact the local Taco stocking distributor or Taco. If the subject
product or part contains no defect as covered in this warranty, the purchaser
will be billed for parts and labor charges in effect at time of factory examination and repair.
Any Taco product or part not installed or operated in conformity with Taco
instructions or which has been subject to misuse, misapplication, the addition of petroleum-based fluids or certain chemical additives to the systems,
or other abuse, will not be covered by this warranty.
If in doubt as to whether a particular substance is suitable for use with a Taco
product or part, or for any application restrictions, consult the applicable
Taco instruction sheets or contact Taco at [401-942-8000].
Taco reserves the right to provide replacement products and parts which are
substantially similar in design and functionally equivalent to the defective
product or part. Taco reserves the right to make changes in details of design,
construction, or arrangement of materials of its products without notification.
TACO OFFERS THIS WARRANTY IN LIEU OF ALL OTHER EXPRESS
WARRANTIES. ANY WARRANTY IMPLIED BY LAW INCLUDING WARRANTIES OF MERCHANTABILITY OR FITNESS IS IN EFFECT ONLY
FOR THE DURATION OF THE EXPRESS WARRANTY SET FORTH IN
THE FIRST PARAGRAPH ABOVE.
THE ABOVE WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES,
EXPRESS OR STATUTORY, OR ANY OTHER WARRANTY OBLIGATION
ON THE PART OF TACO.
TACO WILL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES RESULTING FROM THE USE
OF ITS PRODUCTS OR ANY INCIDENTAL COSTS OF REMOVING OR
REPLACING DEFECTIVE PRODUCTS.
This warranty gives the purchaser specific rights, and the purchaser may
have other rights which vary from state to state. Some states do not allow
limitations on how long an implied warranty lasts or on the exclusion of incidental or consequential damages, so these limitations or exclusions may
not apply to you.
COMFORT MADE EASY®
TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.
TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in Germany
Copyright 2010
TACO, Inc.
Cartridge Pressure
Reducing Valve
(PRV)
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.
+
Figure 3
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.
Dimensions:
NPT
4.3" (110 mm)
2.0"
(51 mm)
removal
space
1⁄2-14
Fast Fill:
The 3350 is equipped with an
automatically resetting fast fill feature. 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
Figure 4
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.
NPT
Figure 2
–
1⁄2-14
Installation:
1. Install the valve in the direction indicated by the flow
arrows on the body. The
360°
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
1⁄ " NPTF on the outlet and
2
may be connected using either
the 1⁄2" NPTF or the Taco union
threads on the inlet. The Taco
Figure 1
union threads are more commonly 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 professionals 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.
Installation Diagram:
11⁄4-14 UNS-2A
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.
0.7"
(17.8 mm)
0.7"
(17.8 mm)
1.5"
(38.1 mm)
3.5"
(90 mm)
Figure 5
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