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TACO SR501-845RP REPLACEMENT CROSS-REFERENCE
MANUFACTURER MODEL CONNECTIONS
Taco SR501-845RP L1 L2 3 4 5 6 R/T W/T
Argo AR821 1 2 3 4 5 6 T
AR822 L1 L2 3 4 NO 5 6 NO R/T G/T
Colombus MR10 L1 L2 3 4 NO 5 6 NO R/T G/T
Erie SR100 L1 L2 3 4 NO 5 6 NO R/T G/T
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
Features:
Universal Replaceability
Indicator Lights
Snap-in PC Board to Existing Enclosure
Simplified Wiring
Fully Enclosed Snap-Out Relay
100% Factory Tested
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 L1 and L2.
Jumper Placement:
The jumper is factory installed between terminals
L1 and 3 to switch power on terminal 4.
Diagnostics:
The Indicator 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 cir-
culator 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
integration. No matter the application, Taco now pro-
vides the products to maximize system performance
while simplifying both installation and service.
Typical
Wiring
Alternative
Wiring
TO: ZR
TO: ZC
THERMOSTAT
TO: 120 VAC POWER
INPUT
R
W
T
T
L2 L1 3 4 5 6
120 VAC
POWER
T STAT
UNIVERSAL REPLACEMENT RELAY
MODEL: SR501-845RP
REPLACES HONEYWELL
R845, RA89A & RA832
OR COMPARABLE RELAY
CIRCULATOR
THERMOSTAT
TO: 120 VAC POWER
CIRCULATOR
TO: TT ON BOILER
JUMPER
R
W
T
T
L2 L1 3 4 5 6
120 VAC
INPUT
POWER
T STAT
UNIVERSAL REPLACEMENT RELAY
MODEL: SR501-845RP
REPLACES HONEYWELL
R845, RA89A & RA832
OR COMPARABLE RELAY
Terminal Description:
T & T Thermostat Connection
L2 Neutral wire of power input
L1 Hot wire of power input
3 Common terminal for 4
4 Normally open terminal
6 Normally open terminal
5 Common terminal for 6
Specifications:
PRODUCT NUMBER TRANSFORMER MAXIMUM DIMENSIONS OF ENCLOSURE
NUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR501-845RP 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
SR501-845RP Universal Replacement Relay
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.
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.
Note: When using Alternative Wiring diagram, the boiler operating control’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 circumstances,
causing injury or death.
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