Instructions / Assembly

OPERATION:
1. To fill the system, open the shut-off valve upstream of the
Boiler Feed Valve. This valve must always be kept open
when the system is in operation.
2. The FAST FILL lever must be pushed all the way over to
the side of the cover slot, over the “A” on the cover flange
for AUTOMATIC operation. The supply water will flow into
the system until it is full and under pressure.
3. The Taco Boiler Feed Valves have such a high flow capac-
ity that the FAST FILL feature is not usually needed during
filling. It is supplied for use during purging of the system.
By moving the lever down and to the side over the “O” on
the flange of the cover (OVERRIDE position), the valve will
be held open, overcoming the closing action of pressure
increases against its diaphragm.
4. After filling and purging, the FAST FILL lever must be
placed at the AUTOMATIC (“A” side) position. Under sys-
tem pressure the lever will move up and be secured in the
notch. The lever should not be moved during system oper-
ation. This position allows the valve to maintain normal
pressure in the system automatically.
5. The Boiler Feed Valve is factory set to deliver water to the
boiler at 12 psi. To determine the required pressure if the
factory setting is not sufficient to lift the water to the highest
radiation, calculate the number of feet from the regulator to
the top of the highest radiation. Multiply this by .43 and add
3 psi. This is the pressure needed to raise the water to the
highest radiation and keep it under sufficient pressure. To
increase the valve setting, loosen the locking nut on the
adjusting screw at the top of the valve. Now turn the adjust-
ing screw in (clockwise) slowly until the gauge indicates
the pressure calculated. Then lock the adjusting screw with
its locking nut.
6. The pressure relief valve of the Dual Control is non-
adjustable and is set to relieve at 30 psi.
OVERRIDE
POSITION
FAST FILL
AUTOMATIC
POSITION
NORMAL
OPERATION
PRESSURE
SETTING
ADJUSTING
SCREW AND
LOCKNUT
WARNING: Using the FAST FILL feature with
the purge valve closed can cause system over
pressurization. This may cause the pressure
relief to discharge extremely hot water, result-
ing in personal injury or death and damage to
other system components or water damage
to other property. Care must be taken to pre-
vent over pressurizing the system.
A Taco Family Company
2017
LIMITED WARRANTY STATEMENT
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 manufacture.
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 pur-
chaser may either contact the local Taco stocking distributor or Taco. If
the subject product or part contains no defect as covered in this warran-
ty, 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 defec-
tive 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 WAR-
RANTIES, EXPRESS OR STATUTORY, OR ANY OTHER WARRANTY
OBLIGATION ON THE PART OF TACO.
TACO WILL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDI-
RECT 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 exclu-
sion of incidental or consequential damages, so these limitations or
exclusions may not apply to you.