Make the switch! The Taco SR501 Switching Relay’s layout makes short work of any job.
With its’ compact design and front mounted diagnostic lights; make any installation a snap.
Combined with the complete line of Taco zone controls, 00
®
circulators, thermostats and
zone valves, the circuit for simplified installation and service work is complete.
©Taco Catalog #100-89 Effective Date: 07/28/10
Supersedes:
#100-5.3 •
07/11/07 Printed in USA
Single Zone Switching Relay
Electronic Controls
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC700
SWITCH SETTINGS
Master/Slave: Master
Reset/Normal: Reset
SYSTEM
CIRCULATOR
TO: "TT" ON BOILER
POWER
ZONE 1
LED
INDICATORS
FUSE
6 AMP
FUSE
6 AMP
SR 501-EXP-4
POWER
CONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORY
PORT
HN/O N H
120 VAC
CIRCULATOR
PRIMARY
OUTPUT
N/C
INPUT
120 VAC
END
SWITCH
RESET
OVERRIDE
THERMOSTATEXPANSION
X
WR
X 1A 2CB
24 VOLTS AC ONLY
C
SINGLE ZONE
EXPANDABLE SWITCHING RELAY
THERMOSTAT
T
120 VAC INPUT
H
N
BOILER
To: DHW Aquastat if PC700
Boiler Reset Temperature is
to be overridden during
DHW call.
Wiring Diagram for Typical Installation
ONE ZONE
SWITCHING RELAY
SR 501-4
FUSE
6 AMP
POWER
ZONE 1
LED
INDICATORS
FUSE
6 AMP
N H 3 4 4 56 6
O/NO/N N/C N/C MOCMOC
120 VAC
INPUT
T T
COM
R
W
24
VAC
TO: 120 VAC POWER
CIRCULATOR
JUMPER
TO: TT ON
BOILER
THERMOSTAT
Submittal Data Information
Single Zone Switching Relay
Submittal Data # 101-145 & 102-375 Effective: 07/28/10
Supersedes: 101-053 — 07/11/07
Features
Front Diagnostic Lights
Simplified Wiring
Premium Sealed Relays
Compact Design
Fuse Protected (with spare)
100% Factory Tested
Isolated End Switch
Contractor Friendly PC Board Layout
Universal Thermostat Compatibility
24 Volt Power Output for hard
wired thermostats
Field Replaceable Transformer
UL Approved
Extended 3 Year Warranty
Made in the USA
Additional EXP Features
One Add-on Power Control Plug
Input to override Outdoor Boiler
Reset if Using PC700, When
DHW Calls for Heat
Interface with all -EXP
Multi-Zone Controls
SR501-HC Features
High Current Switching Capacity
Capable of Controlling:
1 Circulator (120 VAC) with
Boiler Enable or 2 Circulators
(120 VAC) without Boiler Enable
or 1 Circulator (240 VAC)
without Boiler Enable
The Taco Connection
Combine the reliability of the Taco Zone
Valves, Priority Zoning Circulators, Thermo-
stats, and the 00
®
family of circulators with
the advanced features of the Taco Zone Con-
trols to achieve total system integration. No
matter the application, Taco now provides the
products to maximize system performance
while simplifying both installation and service.
External Diagnostics
It’s no longer necessary to open the box
to troubleshoot the system. Externally
visible lights show full functionality of the
switching relay. The green light should
always be on, indicating that power is
connected. When the thermostat calls for
heat, both the appropriate circulator and
red indicating light is energized.
Switching Relays
The single zone switching relay should be standard equipment for every installer. No matter
what type of job, our single zone switching relay replaces every brand made by every manu-
facturer. The single zone switching relays are compatible with conventional and programmable
thermostats, UL listed and come with a 3 year warranty. External indicator lights provide
instant diagnostic feedback, making a snap of service calls or new installation start-ups.
The SR501-HC with its high current switching capability, makes it is ideal for large
residential or light commercial installations.
Taco Expandable Switching Relays
Whether you want to expand up to 120 zones or utilize the advanced features of the
Add-on Power Controls, Taco -EXP controls allow for a simple integration of advanced
features. Energy savings and increased comfort can be easily achieved in any new or
existing system by plugging a PC700 Outdoor Reset Power Control into the SR501-EXP.
Switching Relays
Product Number Transformer Maximum Dimensions of Enclosure
Number of Zones Voltage Combined Load Width Height Depth
SR501 1 Zone 120 VAC Input 12 amps 4-7/8” 6-5/8” 2-3/8”
SR501-EXP 1 Zone 120 VAC Input 12 amps 4-7/8” 6-5/8” 2-3/8”
SR501-HC 1 or 2 Zones 120 VAC Input 20 amps 4-7/8” 6-5/8” 2-3/8”
SR501 and SR501-EXP have a single phase motor rating per zone of 1/3 hp (6 A) @ 120 VAC
SR501-HC Relays has a single phase motor rating per zone of 3/4 hp (13.8 A) @ 120 VAC
All relays are rated for 0-240 Volts
Taco SR501 Replacement Cross-Reference
Manufacturer Model Connections
Taco SR501 H N 3 4 N/O 4 N/C 5 6 N/O 6 N/C R/T W/T COM
SR501-EXP H N N Circ. Output N/O Priority Out N/C X X R/T W/T COM
SR501-HC H N 3 4 X2 X2 R/T W1 & W2
COM
Argo AR821 1 2 3 4 --- 5 6 --- T T ---
AR822 L1 L2 3 4 NO 4 NC 5 6 NO 6 NC R/T G/T C
Columbus MR10 L1 L2 3 4 NO 4 NC 5 6 NO 6 NC R/T G/T C
Erie SR100 L1 N 3 4 NO 4 NC 5 6 NO 6 NC R/T G/T C
Honeywell RA89A 1 2 3 4 --- --- T T
RA832A 1 2 3 4 --- X X T T
R845A 1 2 3 4 --- 5 6 --- T T ---
White-Rogers 889-189 1 2 3 4 --- --- T T ---
829-845 1 2 3 4 --- 5 6 --- T T ---
Taco Inc., 1160 Cranston Street. Cranston, RI 02920 / (401) 942-8000 / Fax (401) 942-2360
Taco (Canada) Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8 / (905) 564-9422 / Fax (905) 564-9436
www.taco-hvac.com
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