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Instruction Sheet
100-3.2A
Zone Valves
Models 555-1/2", 556-3/4", 557-1", 570-1/2", 571-3/4", 572-1", 573-1 1/4"
SUPERSEDES: June 25, 1983 EFFECTIVE: March 21, 2019
Plant I.D. 001-302
TO SERVICE
1. Twist off Power Head 2. Remove the 4 screws from
hold down plate
WARNING: Never remove Power Head while thermostat is calling for heat. If necessary to remove Power
Head, disconnect No. 1 wire from Power Head, wait four (4) minutes, then proceed.
TO REASSEMBLE
Reverse above procedure pushing down on seat assembly
and hold down plate against return spring.
APPLICATION
The Taco Heat Motor Zone Valve is an electricity operated
valve used for zone control of Hydronic Heating and/or
Cooling Systems. It controls the ow of water in a room
or zone in response to the demands of the room or zone
thermostat.
RATING
Electrical
Temperature Range
Working Pressure
(at valve, including pump head)
Maximum
differential pressure
across valve
(pump head)
Service
Volts 24
Amps 0.9
Maximum 240°F (115°C)
Minimum 40°F (5°C)
555-557 150 ft. (46m)
570-573 65 ft (20m)
125PSI (861kPa)
Closed system water
or water/glycol up
to 50%
INSTALLATION
Valves should be installed vertically, to simplify replacement or
cleaning of the seat, if ever required at some future date. The
vertical installation permits drawing a vacuum in the system and
replacing or cleaning the seat without draining the system.
Valve may be sweat into the line without taking apart, provided, care is taken to prevent overheating. Follow these simple
instructions:
1. Use a torch with sharp, pointed ame.
2. Clean surfaces thoroughly and use a good grade of ux.
3. Use of a solder with a melting point below 600°F is recom-
4. Avoid excessive use of ux.
3. Remove seat assembly
Pressure Drop Characteristics
Size
C
V
1/2" 4.2 3.6 8 2.4
3/4" 6.1 5.3 20 6.1
1" 7.0 6.1 65 19.8
1 1/4" 7.2 6.2 150 45.7
mended. Do not overheat! Direct ame tip away from the
center of the valve.
K
V
Equiv. Length of Pipe
Feet Meters
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TRANSFORMER
Use a Model 569 Taco Transformer or other make rated
at 115/24V-40VA. One transformer can accommodate a
maximum of 3 Taco-Zone Valves.
TYPICAL INSTALLATION DIAGRAM INDIVIDUAL ROOM CONTROL
2 WAY MODELS
MANUAL OPENING LEVER
For gravity circulation thru valve, push lever in Power Head
all the way down. Push back up to restore to automatic
operation. Lever moves easily when valve is open. Resistance
is encountered when valve is closed.
TYPICAL WIRING DIAGRAM
TACO THERMOSTATS
TACO ZONE VALVES
3 ZONES - 40 VA TRANSFORMER
BASIC WIRING DIAGRAM
INTERMITTANT OPERATING PUMP
24V
115V
TO “T” TERMINALS ON
BOILER CONTROL
TRANSFORMER RELAY
RETURN
RETURN
HEATING UNIT
FIG. 4
HEATING UNIT
FIG. 5
FAN COIL UNIT
(HEATING ONLY)
FIG. 6
FAN COIL UNIT
(HEATING ONLY)
FIG. 7
SUPPLY
SUPPLY
(3)
SUPPLY
RETURN
(3)
RETURN
SUPPLY
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
• 550 Series: One (1) year from date code.
• 570 Series:
- Body - Five (5) years from date code.
- Power Head - Three (3) years from date code.
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 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 addi-
tion of petroleum-based uids 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
notication.
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,
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 specic 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.
A Taco Family Company
2019
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