Instruction Sheet
Priority Zoning Circulator –Models 005-0012
aco
®
102-070
SUPERSEDES: September 1, 1994
Patent Pending
EFFECTIVE: October 15, 1995
Plant I.D. 001-999
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TACO, INC.
, 1160 Cranston Street, Cranston, RI 02920
Telephone: (401) 942-8000
FAX: (401) 942-2360.
TACO (Canada), Ltd.
, 6180 Ordan Drive, Mississauga, Ontario L5T 2B3.
Telephone: 905/564-9422.
FAX: 905/564-9436.
Printed in USA
Copyright 1994
TACO, Inc.
Description:
The Taco Priority Zoning Circulator combines the reliability
of the “00” circulator with the convenience and efficiency of
a PC board mounted switching relay package. Each Zoning
Circulator has a built-in Priority Switch mounted directly on
the PC board. The priority switch allows the installer to
choose the zone that requires the most priority, and when
activated only that circulator will run. The Priority Zoning
Circulator can be used in conjunction with circulators or
zone valves. It is compatible with electronic digital ther-
mostats. This modular design has two PC boards that fit all
models.
Application:
Hydronic systems that require the installer to choose one
zone that has priority over all other zones.
• In-direct hot water heaters.
• Zoning with circulators.
• Add a zone to existing heating systems.
• Under-sized zones that never come up to heat can now
be switched to first priority.
Installation:
FOLLOW ALL INSTRUCTIONS IN THE SEQUENCE THAT
THEY APPEAR.
BASIC “00” Circulator Installation Instructions
1. Refer to instruction sheet number 102-054 for all basic
circulator application/installation instructions packed
separately in the Priority Zoning Circulator box.
Priority Switch:
1. All Priority Zoning Circulators are shipped with the prior-
ity switch in the ‘ON’ position.
2. When using the priority feature, leave the ‘ONE’ priority
circulator in the ‘ON’ position, and switch the non-prior-
ity circulators to the ‘OFF’ position. A maximum of 1 pri-
ority “00” circulator and 3 non-priority “00” circulators
can be connected together.
Priority Zoning Circulator Operation:
1. Priority circulator thermostat calls for heat.
2. The Priority circulator turns ‘ON’.
3. The Non-Priority circulators turn ‘OFF’.
4. The dry contact switch to the boiler control closes allow-
ing the boiler to operate.
Electrical Hook-Up:
1. All electrical work must be performed by an electrician in
accordance with the latest edition of the National
Electrical Codes and Local Codes and Regulations.
2. Disconnect all Electrical Power.
3. Wiring Connections: Follow Basic Priority Zoning
Circulator Wiring Diagrams.
Terminals 1 & 2: Maximum 24VAC
Thermostat – Connect terminals 1 and 2 to the individual
room thermostat.
Terminals 3 & 4: Maximum 240VAC 5AMP
Relay-Contact – Connect terminals 3 and 4 to the boiler
controls.
High Voltage Terminal Strip
Line Voltage – Connect 115VAC to Live and Neutral termi-
nals.
Priority Switch – Connect PR out to PR in of next circulator.
Repeat step until all Zoning Circulator PR in and PR out
connections are made.
Non-Priority – If the Priority feature is not used, then don’t
connect the PR in or PR out terminals.
Ground – Provide the proper ground connection wire and
attach it to the green ground screw inside the circulator’s
capacitor box.
