Terminal Description:
T & T Thermostat Connection
COM Common side of transformer, to power some setback thermostats
N Neutral wire of power input
H Hot wire of power input
3 Common terminal for 4 n/o and 4 n/c
4 n/o Normally open terminal
4 n/c Normally closed terminal
6 n/c Normally closed terminal
6 n/o Normally open terminal
5 Common terminal for 6 n/o and 6 n/c
Specifications:
PRODUCT NUMBER TRANSFORMER MAXIMUM DIMENSIONS OF ENCLOSURE
NUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR501 1 Zone 120 VAC Input 7.2 amps 4 1/4" 5 1/4" 2 3/4"
All Switching Relays are relay type DPDT, have a thermostat current of .18, and have a single
phase motor rating per zone of 1/3 hp (7.2A) @ 120 VAC.
Instruction Sheet
SR501 Switching Relay
Do it Once. Do it Right.
®
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.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2005
TACO, Inc.
Features:
External Indicator Lights
Universal Replaceability
Snap-in PC Board
Simplified Wiring
Fully Enclosed Snap-Out Relays
100% Factory Tested
Contractor Friendly PC Board Layout
Universal Thermostat Compatibility
UL Approved
Extended 3 Year Warranty
Made in the USA
Operation:
Connect a thermostat to the “T T” terminals on
the switching relay. When the thermostat calls for
heat, the relay is energized and power is given to the
circulator.
Power Input:
Connect 120 volt ac power to terminals N and H.
Jumper Placement:
The jumper is factory installed between terminals H
and 3 to switch power on terminals 4 n/o and 4 n/c.
External Diagnostics:
The External lights show full functionality of the
switching relay. The green light should always be on,
indicating that power is connected. When the ther-
mostat calls for heat, both the appropriate circulator
and red indicating light is energized.
The Taco Connection:
Combine the reliability of the Taco Zone Valves,
Priority Zoning Circulators, Thermostats, and the “00”
family of circulators with the advanced features of the
Taco Zone Controls to achieve total system integra-
tion. No matter the application, Taco now provides
the products to maximize system performance while
simplifying both installation and service.
Warning: Wiring connections must be made in accordance with all applicable elec-
trical codes and these instructions. Use copper wire only. Failure to follow this
instruction can result in personal injury or death and/or property damage. 10-18
gauge wire recommended for 120 VAC connections with 9 in.lbs. max torque, 12-22
gauge wire for thermostat connections with 9 in.lbs. max torque, and 12-22 gauge
wire for 24 VAC source with 5 in.lbs. max torque.
Note: When using Alternative Wiring diagram, the boiler operating con-
trol’s ZC terminal will see the load of the circulator(s).
Warning: When using Alternative Wiring diagram, wiring instructions
must be followed so power originates from the boiler aquastat. Failure to
follow these wiring instructions may result in a secondary source of power
being connected to the boiler that may activate it under certain circum-
stances, causing injury or death.
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