Taco 25520Z User guide

Brand: Taco

Model: 25520Z

Type: User guide

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

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 1A 2CB

24 VOLTS AC ONLY

SINGLE ZONE

EXPANDABLE SWITCHING RELAY

THERMOSTAT

120 VAC INPUT

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

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

Taco 25520Z User guide

Taco 25520Z User guide

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