ESP Zone Valve™ Wiring Diagrams
2-Way, 3-Way, Normally Open, Normally Closed
EFFECTIVE: August 1, 2003
SUPERSEDES: 102-111, dated July 1, 2002
Simplified Internal
Schematic:
Thermostats
Rh/Rc
w/y
c
Transformer
Rh/Rc
w/y
Rh/Rc
w/y
T
T
To “T” Terminals
on Boiler Control
Transformer Relay
SUPPLY
RETURN
SUPPLY
RETURN
w/y
c
End Switch
w/y
c
End Switch
w/y
c
End Switch
LED
End Switch
L1 (Hot)
L2
24 v
Capacitor
(Motor)
w/y
3-Way Installation:
Typical ESP Zone Valve Wiring:
Up to 12 Valves per
40va Transformer
MIX
Actuator’s power connections must be
over the supply port to ensure proper flow direction.
Taco ESP Zone Valves
Wiring a Taco ESP Zone Valve to Replace a
Honeywell, Erie or Sparco Valve:
MIX
Wiring a Taco ESP Zone Valve to Replace a
Flair or Taco 3-Wire Valve:
Honeywell, Erie and Sparco Wire Leads
Flair
Thermostat
Thermostat
See Chart
L1 (Hot)
L2
Motor
See Chart
L1 (Hot)
L2
4
1
2
Red
Motor Wire Color
5
Motor
3
Red
Honeywell = Yellow
Erie = Black
Sparco = Orange/Yellow
End Switch
End Switch
To “T” Terminals
To “T” Terminals
Taco 570 Series
Honeywell and Erie Terminal Block
L1 (Hot)
L2
TH
Motor
TH
TR
Thermostat
End Switch
Thermostat
L1 (Hot)
L2
ES
1
Motor
2
ES
3
TR
End Switch
To “T” Terminals
To “T” Terminals
Taco ESP Valve
Taco ESP Valve
c
w/y
L2
L1 (Hot)
c
w/y
L2
L1 (Hot)
End Switch
Thermostat
Thermostat
To “T” Terminals on Boiler
Control Transformer Relay
End Switch
To “T” Terminals on Boiler
Control Transformer Relay
Wiring a Taco ESP Zone Valve to Replace a White Rodgers Valve:
Taco ESP Valve
White-Rodgers (1311 or 1321)
To “T” Terminals
Thermostat
5
6
Motor
L2
L1 (Hot)
End Switch
6
IT
6
5
3
c
w/y
End Switch
Thermostat
4
DO
4
4
2
5
1
ONCE. DO
IT
L1 (Hot)
L2
To “T” Terminals on Boiler
Control Transformer Relay
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 2003
TACO, Inc.