The All New . . .
TACO Zone Control Product Information Switching Relays Product No. SR501-4 SR501-HC-4 SR501-OR-4 SR502-4 SR503-4 SR504-4 SR506-4 Description 1 Zone Switching Relay 1 or 2 Zone Switching Relay, High Current Capacity 1 Zone Switching Relay with Outdoor Reset 2 Zone Switching Relay with Priority 3 Zone Switching Relay with Priority 4 Zone Switching Relay with Priority 6 Zone Switching Relay with Priority Expandable Switching Relays – Expandable to 120 Zones (20 Zoning Panels) Product No.
SR 501-4 COM 24 VAC FUSE 6 AMP JUMPER CIRCULATOR N H 3 4 4 N/O COM TO: TT ON BOILER 6 6 5 N/C SR 501-4 N/O COM CIRCULATOR 6 6 5 N/C FUSE 6 AMP 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.
SR501-HC-4 – One Zone Switching Relay with or without Boiler Enable Typical Wiring Alternative Wiring 24 VAC THERMOSTAT 24 VAC THERMOSTAT 24 R W1 W2 VAC T T T COM 24 R W1 W2 VAC T T T COM ONE ZONE HC SWITCHING RELAY ONE ZONE HC SWITCHING RELAY LED INDICATORS LED INDICATORS POWER POWER RELAY 1 RELAY 1 RELAY 2 RELAY 2 SR 501-HC-4 SR 501-HC-4 120 VAC INPUT 120 VAC INPUT RELAY 1 RELAY 2 BOILER CONTROL POWER N INPUT (120 VAC) H POWER INPUT (120 VAC) 120 VAC CIRCULATOR N H ZR 120 VAC CIRC
SR501-OR-4 – One Zone Switching Relay with Outdoor Reset TRANSFORMER THERMOSTATS (24VAC) 120 VAC INPUT 24 VAC THERMOSTAT OUTDOOR SENSOR BOILER SUPPLY SENSOR BOILER CONTROL ZONE VALVE END SWITCH(S) OUTDOOR SENSOR BOILER CONTROL BOILER SUPPLY SENSOR ON OFF ON OFF 24 VAC SW1 SW1 40 BOILER TSTAT DESIGN OUTDOOR TEMPERATURE FOR 180°F SUPPLY TEMPERATURE -10 0 10 -20 20 POT1 -30 30 SUPPLY SENSOR SENSOR DHW ONE ZONE SWITCHING RELAY WITH OUTDOOR RESET LED INDICATORS OFF 40 X X R W C R W OUT
L1 (HOT) L2 (NEUTRAL) T THERMOSTATS CIRCUIT BREAKER 24 VAC CUSTOMER EMERGENCY SWITCH X X R W R W R W R W THERMOSTATS ZONE 4 PRIORITY ISOLATED ZONE 1 ZONE 2 ZONE 3 ZONE 4 END SWITCH THERMOSTATS (24 VAC) PRIORITY ON OFF COM FOUR ZONE SWITCHING RELAY T LED INDICATORS L1 POWER ZONE 1 THERMAL FUSE (FIROMATIC) FUSE 6 AMP FUSE 6 AMP FUSE 6 AMP FUSE 6 AMP FUSE 6 AMP C1 ZONE 2 ZONE 3 L2 T T HONEYWELL L8124 OR EQUAL B2 C2 ZC ZR B1 ZONE 4 120 VAC 120 VAC CIRCULATORS PRIORITY INPU
Two Switching Relays Connected Together INDIRECT WATER HEATER AQUASTAT OR THERMOSTAT THERMOSTATS T TO: "TT" ON BOILER 24 VAC X X T W R R T W R W R ZONE 4 PRIORITY W ON OFF ISOLATED ZONE 1 ZONE 2 ZONE 3 ZONE 4 END SWITCH THERMOSTATS (24 VAC) PRIORITY COM LED INDICATORS FOUR ZONE SWITCHING RELAY POWER ZONE 1 FUSE 6 AMP FUSE 6 AMP FUSE 6 AMP FUSE 6 AMP ZONE 2 FUSE 6 AMP ZONE 3 ZONE 4 120 VAC 120 VAC CIRCULATORS PRIORITY INPUT ZC H ZR H ZONE1 ZONE2 ZONE3 ZONE4 N H N H N H N H 120
Priority Zoning Circulator Controlling Switching Relay MASTER PRIORITY MASTER/SLAVE SWITCH CIRC.
BOILER COM R W R T W R T W R THERMOSTATS T W FUSE 6 AMP FUSE 6 AMP FUSE 6 AMP FUSE 6 AMP ZC H ZONE1 ZONE2 ZONE3 ZONE4 N H N H N H N H REMOVE JUMPER ZR H N X R 24 VAC OUTPUT (OPTIONAL) COM 24 VAC R W R T W R T W R THERMOSTATS T W ISOLATED ZONE 1 ZONE 2 ZONE 3 ZONE 4 END SWITCH THERMOSTATS (24 VAC) PRIORITY X X T SR 504-4 ZONE 4 ZONE 3 FUSE 6 AMP FUSE 6 AMP ZC H ZONE1 ZONE2 ZONE3 ZONE4 N H N H N H N H REMOVE JUMPER ZR H N H 120 VAC 120 VAC 120 VAC CIRCULATORS PRI
9 BOILER COM R W R T W R T W R T W FUSE 6 AMP FUSE 6 AMP FUSE 6 AMP FUSE 6 AMP ZC H ZONE1 ZONE2 ZONE3 ZONE4 N H N H N H N H REMOVE JUMPER ZR H N H 120 VAC N/O COM R W R T W R T W R T W ZONE 4 120 VAC INPUT FUSE 6 AMP FUSE 6 AMP ZC H ZONE1 ZONE2 ZONE3 ZONE4 N H N H N H N H REMOVE JUMPER ZR H N H FUSE 6 AMP ZONE 4 ZONE 3 SR 504-4 120 VAC INPUT 120 VAC 120 VAC 120 VAC CIRCULATORS PRIORITY INPUT FUSE 6 AMP POWER ZONE 2 ZONE 3 FUSE 6 AMP ON OFF LED INDICATOR
SR501-EXP Switching Relay Controlling Another Switching Relay INDIRECT WATER HEATER AQUASTAT OR THERMOSTAT TO: "TT" ON BOILER NOTE 1: Terminals C are for optional 24V thermostat COMMON connections.
SR501-EXP Switching Relay Controlling a Zone Valve Control INDIRECT WATER HEATER AQUASTAT OR THERMOSTAT TO BOILER AQUASTAT RELAY NOTE 1: Terminals C are for optional 24V thermostat COMMON connections.
2 Expandable Switching Relays Connected Together NOTE 1: Terminals C are for optional 24V thermostat COMMON connections.
13 SLAVE ZC H ZR H 120 VAC FUSE 6 AMP OFF FUSE 6 AMP ACCESSORY PORT FUSE 6 AMP END SWITCH LOW LIMIT (ZC) ON N H N SLAVE FUSE 6 AMP PRIMARY ZONE1 ZONE2 ZONE3 ZONE4 ZONE4 N H N H N H N H N H N H PRIORITY N/C FUSE 6 AMP FUSE 6 AMP N H INPUT 120 VAC FOUR ZONE EXPANDABLE SWITCHING RELAY ZONE 4 ZONE 3 ZONE 2 ZONE 1 POWER LED INDICATORS PRIORITY ZONE 4 30 SEC/2 WK LOW LIMIT (ZC) ON N H FUSE 6 AMP PRIORITY N/C FUSE 6 AMP N H FUSE 6 AMP ZC H ZR H 120 VAC X X X X FUSE 6 AMP
14 BOILER COM R W R T W R T W R W FUSE 6 AMP FUSE 6 AMP FUSE 6 AMP FUSE 6 AMP ZR H JUMPER ZC H ZONE NOT USED ZONE1 ZONE2 ZONE3 ZONE4 N H N H N H N H N H 120 VAC R W R W H H H COM 24 VAC R W R T W R T W R W ISOLATED ZONE 1 ZONE 2 ZONE 3 ZONE 4 END SWITCH THERMOSTATS (24 VAC) PRIORITY X X T THERMOSTATS ZONE 4 ZONE 3 120 VAC INPUT FUSE 6 AMP FUSE 6 AMP ZR H JUMPER ZC H ZONE NOT USED ZONE1 ZONE2 ZONE3 ZONE4 N H N H N H N H N H 120 VAC 120 VAC 120 VAC CIRCULA
15 PRIMARY SYSTEM CIRCULATOR (OPTIONAL) ZC H ZR H 120 VAC FUSE 6 AMP OFF X X X X FUSE 6 AMP ACCESSORY PORT FUSE 6 AMP END SWITCH T THERMOSTATS ZONE 2 ZONE 3 FUSE 6 AMP ZONE NOT USED PRIMARY ZONE1 ZONE2 ZONE3 ZONE4 ZONE4 N H N H N H N H N H N H PRIORITY N/C FUSE 6 AMP FUSE 6 AMP N H INPUT 120 VAC FOUR ZONE EXPANDABLE SWITCHING RELAY THERMOSTATS (24 VAC) ZONE 1 NET R W R W H H 30 SEC/2 WK LOW LIMIT (ZC) ON POST PURGE ON PRIORITY PROTECT ON PUMP EXERCISE ON PRIMARY PUMP ON
PC700 Boiler Reset Control Connected to SR501-EXP Switching Relay OUTDOOR SENSOR THERMOSTAT T NOTE 1: Terminals C are for optional 24V thermostat COMMON connections. PC700 BOIL OUT SEN SEN ZONE CONTROL BOILER SENSOR To: DHW Aquastat if PC700 Boiler Reset Temperature is to be overridden during DHW call.
SR501-EXP and PC700 Boiler Reset Control Connected to an Existing Switching Relay OUTDOOR SENSOR Note: If Zone Control comes on without a call for heat, reverse Reset Override input (1 & 2) wires on SR501-EXP.
SR501-EXP and PC700 Boiler Reset Control Connected to an Existing Zone Valve Control OUTDOOR SENSOR Note: If Zone Control comes on without a call for heat, reverse Reset Override input (1 & 2) wires on SR501-EXP.
SR501-EXP and PC702 Boiler Reset Control Connected to an Existing Switching Relay OUTDOOR SENSOR Note: If Zone Control comes on without a call for heat, reverse Reset Override input (1 & 2) wires on SR501-EXP.
20 OUTDOOR SENSOR ZONE CONTROL BOILER SENSOR BOIL OUT SEN SEN PC700 BOILER SLAVE 30 SEC/2 WK LOW LIMIT (ZC) ON PRIMARY SYSTEM CIRCULATOR (OPTIONAL) ZC H ZR H 120 VAC FUSE 6 AMP OFF FUSE 6 AMP ACCESSORY PORT FUSE 6 AMP NOTE 1: Terminals C are for optional 24V thermostat COMMON connections.
21 BOILER #2 BOILER #1 BOILER SENSOR STAGE STAGE BOIL OUT ZONE 1 2 SEN SEN CONTROL PC702 DHW DEMAND OUTDOOR SENSOR SLAVE WIRING NEEDED ONLY IF PRIORITY ZONE IS DHW PRIMARY SYSTEM CIRCULATOR (OPTIONAL) ZC H ZR H 120 VAC FUSE 6 AMP OFF X X X X FUSE 6 AMP ACCESSORY PORT FUSE 6 AMP END SWITCH T NOTE 1: Terminals C are for optional 24V thermostat COMMON connections.
22 OUTDOOR SENSOR ZONE CONTROL BOILER SENSOR SUPPLY SENSOR BOIL SUP OUT SEN SEN SEN PC705-2 BLACK BLUE RED SLAVE LOW LIMIT (ZC) ON SYSTEM AND/OR BOILER CIRCULATOR (SEE NOTE A) ZC H ZR H 120 VAC FUSE 6 AMP OFF X X X X FUSE 6 AMP ACCESSORY PORT FUSE 6 AMP END SWITCH T ZONE 2 ZONE 3 FUSE 6 AMP PRIMARY ZONE1 ZONE2 ZONE3 ZONE4 ZONE4 N H N H N H N H N H N H PRIORITY N/C FUSE 6 AMP H ZONE 4 ZONE 3 ZONE 2 ZONE 1 POWER LED INDICATORS NET NOTE B: WHEN SYSTEM CIRCULATOR IS CONNECTE
PC700 Boiler Reset Control Connected to 2 EXP Switching Relays SWITCH SETTINGS BOILER MASTER See NOTE 1 MASTER SLAVE POWER CONTROLS THERMOSTATS T Master/Slave: Master Priority Zone: On or Off Reset/Normal: Reset OFF PRIORITY ON X X X X NORMAL RESET A B C R W C R W C R W C R W C 1 2 PRIMARY PUMP ON OFF MAIN PRIORITY EXPANSION POST PURGE ON PRIORITY PROTECT ON PUMP EXERCISE ON OFF OFF OFF END SWITCH 30 SEC/2 WK ZONE 3 ACCESSORY PORT NET ZONE 4 PRIORITY FOUR ZONE EXPANDABLE SWITCHI
PC702 2–Stage Boiler Reset Control Connected to 2 EXP Switching Relays SWITCH SETTINGS OUTDOOR SENSOR MASTER SLAVE POWER CONTROLS OFF NORMAL X X X X PRIMARY PUMP ON OFF MAIN PRIORITY EXPANSION POST PURGE ON PRIORITY PROTECT ON PUMP EXERCISE ON OFF OFF OFF END SWITCH RESET PC702 See NOTE 1 MASTER PRIORITY ON DHW DEMAND THERMOSTATS T Master/Slave: Master Priority Zone: On or Off Reset/Normal: Reset 30 SEC/2 WK A B C R W C R W C R W C R W C 1 2 ZONE 3 ACCESSORY PORT NET ZONE 4 PRIOR
PC705 Variable Speed Pump Injection Control Connected to 2 EXP Switching Relays TO: "TT" ON BOILER SWITCH SETTINGS BOILER MASTER OFF PRIORITY ON NORMAL X X X X PRIMARY PUMP ON OFF MAIN PRIORITY EXPANSION POST PURGE ON PRIORITY PROTECT ON PUMP EXERCISE ON OFF OFF OFF END SWITCH RESET OUTDOOR SENSOR See NOTE 1 MASTER SLAVE POWER CONTROLS A B C R W C R W C R W C R W C 1 2 ZONE 2 ZONE 3 ACCESSORY PORT LED INDICATORS POWER ZONE 1 ZONE 2 RED BLUE FUSE 6 AMP SYSTEM CIRCULATOR FUSE 6 AM
PC700 and PC705 Controls Connected to 2 EXP Switching Relays TO: "TT" ON BOILER SWITCH SETTINGS BOILER MASTER POWER CONTROLS See NOTE 1 MASTER SLAVE OFF PRIORITY ON NORMAL X X X X PRIMARY PUMP ON OFF MAIN PRIORITY EXPANSION POST PURGE ON PRIORITY PROTECT ON PUMP EXERCISE ON OFF OFF OFF END SWITCH RESET A B C R W C R W C R W C R W C 1 2 ZONE 1 ZONE 2 ZONE 3 THERMOSTATS (24 VAC) OFF ACCESSORY PORT NET ZONE 4 PRIORITY FOUR ZONE EXPANDABLE SWITCHING RELAY 4 MIN/24 HOUR 30 SEC/2 WK L
PC702 and PC705 Controls Connected to 2 EXP Switching Relays OUTDOOR SENSOR SWITCH SETTINGS MASTER DHW DEMAND POWER CONTROLS STAGE STAGE BOIL OUT ZONE 1 2 SEN SEN CONTROL See NOTE 1 MASTER SLAVE OFF PRIORITY ON NORMAL X X X X PRIMARY PUMP ON OFF MAIN PRIORITY EXPANSION POST PURGE ON PRIORITY PROTECT ON PUMP EXERCISE ON OFF OFF OFF END SWITCH RESET PC702 THERMOSTATS T Master/Slave: Master Priority Zone: On or Off Reset/Normal: Reset ZONE 1 ZONE 2 ZONE 3 OFF ACCESSORY PORT NET ZON
H N BOILER A B SYSTEM PUMP 24 VAC 24 VAC SYSTEM PUMP AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.
29 H N 120 VAC INPUT BLACK WHITE BLACK 120 VAC INPUT WHITE A B 24 VAC 24 VAC DHW PUMP X X PUMP END SWITCH N/O COM N/C ZONE 6 PUMP END SWITCH FUSE 5 AMP FUSE 5 AMP TO: BOILER AQUASTAT RELAY BOILER TURNS ON WHEN ANY ZONE VALVE OPENS. DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
WHITE 120 VAC INPUT BLACK WHITE BLACK 120 VAC INPUT B 24 VAC 24 VAC SYSTEM PUMP A X N/O COM N/C ZONE 6 PUMP END SWITCH DHW PUMP X PUMP END SWITCH FUSE 5 AMP FUSE 5 AMP TO: BOILER AQUASTAT RELAY SYSTEM PUMP AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS. DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
31 WHITE 120 VAC INPUT BLACK WHITE BLACK 120 VAC INPUT B SYSTEM PUMP A 24 VAC 24 VAC DHW PUMP X N/O COM N/C ZONE 6 PUMP END SWITCH SECONDARY PUMP X PUMP END SWITCH FUSE 5 AMP FUSE 5 AMP TO: BOILER AQUASTAT RELAY T T 2 WIRE ZONE VALVE (NO END SWITCH) MUST USE JUMPER TACO 3 WIRE ZONE VALVE 1 2 3 MOTOR END SWITCH ZONE 5 1 2 3 4 Powered from Transformer B NOTE 1: Terminals C are for optional 24V thermostat COMMON connections.
2 ZVC403/404/405/406 Connected Together with Priority THERMOSTATS (24VAC) TO: BOILER AQUASTAT RELAY T T T PRIORITY ON 24 VAC R W C R W C R W C R W C X X ZONE 1 ZONE 2 ZONE 3 ZONE 4 ISOLATED END SWITCH THERMOSTATS (24 VAC) PRIORITY FUSE 5 AMP H WHITE 120 VAC INPUT BLACK ZONE 4 PRIORITY POWER IN 24 VAC N FACTORY INSTALLED TRANSFORMER See NOTE 1 ON OFF LED INDICATORS POWER ZVC 404 – 4 FOUR ZONE ZONE VALVE CONTROL 24 VAC ZONE VALVES ZONE 1 1 2 3 4 PUMP END ZONE 4 PUMP SWITCH END SWITCH X X
2 EXP Zone Valve Controls Connected Together with System Pump TO: "TT" ON BOILER WITH DHW "TT" INPUT Powered from Transformer A TO: BOILER AQUASTAT RELAY BOILER Powered from Transformer B SWITCH SETTINGS Master/Slave: Master Priority Zone: On Reset/Normal: Normal INDIRECT WATER HEATER AQUASTAT OR THERMOSTAT THERMOSTATS (24 VAC) T T T See NOTE 1 POWER CONTROLS A 24 VAC X X X X A B C R W C R W C R W C R W C R W C R W C 1 2 MAIN PRIORITY EXPANSION ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6 NET EN
2 EXP Zone Valve Controls Connected Together with DHW Pump TO: "TT" ON BOILER WITH DHW "TT" INPUT Powered from Transformer A TO: BOILER AQUASTAT RELAY BOILER Powered from Transformer B SWITCH SETTINGS Master/Slave: Master Priority Zone: On Reset/Normal: Normal INDIRECT WATER HEATER AQUASTAT OR THERMOSTAT THERMOSTATS (24 VAC) T T T See NOTE 1 POWER CONTROLS A 24 VAC X X X X A B C R W C R W C R W C R W C R W C R W C 1 2 MAIN PRIORITY EXPANSION ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6 NET END S
2 EXP Zone Valve Controls Connected Together with System and DHW Pumps TO: "TT" ON BOILER WITH DHW "TT" INPUT Powered from Transformer A TO: BOILER AQUASTAT RELAY BOILER Powered from Transformer B SWITCH SETTINGS Master/Slave: Master Priority Zone: On Reset/Normal: Normal INDIRECT WATER HEATER AQUASTAT OR THERMOSTAT THERMOSTATS (24 VAC) T T T See NOTE 1 POWER CONTROLS A 24 VAC X X X X A B C R W C R W C R W C R W C R W C R W C 1 2 MAIN PRIORITY EXPANSION ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE
2 EXP Zone Valve Controls Connected Together with System, DHW and Secondary Pumps TO: "TT" ON BOILER WITH DHW "TT" INPUT Powered from Transformer A TO: BOILER AQUASTAT RELAY BOILER Powered from Transformer B SWITCH SETTINGS Master/Slave: Master Priority Zone: On Reset/Normal: Normal INDIRECT WATER HEATER AQUASTAT OR THERMOSTAT THERMOSTATS (24 VAC) T T T See NOTE 1 POWER CONTROLS A 24 VAC X X X X A B C R W C R W C R W C R W C R W C R W C 1 2 MAIN PRIORITY EXPANSION ZONE 1 ZONE 2 ZONE 3 ZONE 4
37 OUTDOOR SENSOR N 120 VAC INPUT H ZONE CONTROL A B 24 VAC 24 VAC BOILER X X SYSTEM PUMP DRY CONTACTS N/O COM N/C T T THERMOSTATS (24 VAC) Powered from Transformer A T TACO 3 WIRE ZONE VALVE Powered from Transformer A 2 WIRE ZONE VALVE (NO END SWITCH) MUST USE JUMPER 1 2 3 MOTOR END SWITCH ZONE 5 1 2 3 4 PRIORITY ZONE JUMPER 3&4 ZONE 6 1 2 3 4 PRIORITY Powered from Transformer B 4 WIRE ZONE VALVE (POWER OPEN, SELF CLOSING) ZONE 2 ZONE 3 ZONE 4 1 2 3 4 1 2 3 4 1 2 3 4 JUMPER
120 VAC H INPUT N BOILER #2 BOILER #1 120 VAC INPUT BLACK WHITE 120 VAC INPUT BLACK WHITE A B 24 VAC 24 VAC WIRING NEEDED ONLY IF PRIORITY ZONE IS DHW X X PUMP END SWITCH SYSTEM PUMP N/O COM N/C ZONE 6 PUMP END SWITCH FUSE 5 AMP FUSE 5 AMP SWITCH SETTINGS T TACO 3 WIRE ZONE VALVE Powered from Transformer A 2 WIRE ZONE VALVE (NO END SWITCH) MUST USE JUMPER 1 2 3 END SWITCH PRIORITY ZONE JUMPER 3&4 ZONE 6 1 2 3 4 Powered from Transformer B 4 WIRE ZONE VALVE (POWER OPEN, SELF CLOS
39 ZONE CONTROL BLACK BLUE 120 VAC INPUT BLACK WHITE 120 VAC INPUT BLACK WHITE A B INJECTION CIRCULATOR SYSTEM CIRCULATOR AND/OR BOILER 24 VAC 24 VAC X DRY CONTACTS N/O COM N/C ZONE 6 PUMP END SWITCH T T THERMOSTATS (24 VAC) Powered from Transformer A T TACO 3 WIRE ZONE VALVE Powered from Transformer A 2 WIRE ZONE VALVE (NO END SWITCH) MUST USE JUMPER 1 2 3 MOTOR END SWITCH ZONE 5 1 2 3 4 PRIORITY ZONE JUMPER 3&4 ZONE 6 1 2 3 4 Powered from Transformer B 4 WIRE ZONE VALVE (
PC700 Boiler Reset Control Connected To 2 EXP Zone Valve Controls OUTDOOR SENSOR TO: "TT" ON BOILER WITH DHW "TT" INPUT TO: BOILER AQUASTAT RELAY BOILER Powered from Transformer A Powered from Transformer B PC700 SWITCH SETTINGS ZONE CONTROL Master/Slave: Master Priority Zone: On or Off Reset/Normal: Reset FACTORY INSTALLED TRANSFORMER WHITE 120 VAC INPUT BLACK T FACTORY INSTALLED TRANSFORMER 120 VAC INPUT BLACK T T See NOTE 1 POWER CONTROLS A 24 VAC X X X X A B C R W C R W C R W C R W C R
PC702 2–Stage Boiler Reset Control Connected To 2 EXP Zone Valve Controls OUTDOOR SENSOR DHW DEMAND PC702 Powered from Transformer B Powered from Transformer A STAGE STAGE BOIL OUT ZONE 1 2 SEN SEN CONTROL WIRING NEEDED ONLY IF PRIORITY ZONE IS DHW BOILER SENSOR Master/Slave: Master Priority Zone: On or Off Reset/Normal: Reset T FACTORY INSTALLED TRANSFORMER 120 VAC INPUT BLACK T See NOTE 1 A 24 VAC X X X X A B C R W C R W C R W C R W C R W C R W C 1 2 MAIN PRIORITY EXPANSION ZONE 1 ZONE 2 ZON
PC705 Variable Speed Pump Injection Control Connected To 2 EXP Zone Valve Controls OUTDOOR SENSOR GREEN/GROUND (SEE NOTE B ON PAGE 22) TO: "TT" ON BOILER WITH DHW "TT" INPUT SYSTEM CIRCULATOR BLUE TO: BOILER AQUASTAT RELAY RED BOILER PC705-2 BLACK BOIL SUP OUT SEN SEN SEN INJECTION CIRCULATOR ZONE CONTROL Powered from Transformer A Powered from Transformer B SWITCH SETTINGS SUPPLY SENSOR BOILER SENSOR INDIRECT WATER HEATER AQUASTAT OR THERMOSTAT THERMOSTATS (24 VAC) Master/Slave: Master Pri
PC700 and PC705 Connected To 2 EXP Zone Valve Controls OUTDOOR SENSOR TO: "TT" ON BOILER WITH DHW "TT" INPUT TO: BOILER AQUASTAT RELAY BOILER Powered from Transformer B Powered from Transformer A PC700 ZONE CONTROL BOILER SENSOR FACTORY INSTALLED TRANSFORMER WHITE 120 VAC INPUT BLACK T FACTORY INSTALLED TRANSFORMER 120 VAC INPUT BLACK 24 VAC A T See NOTE 1 X X X X A B C R W C R W C R W C R W C R W C R W C 1 2 MAIN PRIORITY EXPANSION ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6 NET END SWITCH THE
PC702 and PC705 Connected To 2 EXP Zone Valve Controls OUTDOOR SENSOR DHW DEMAND PC702 Powered from Transformer B Powered from Transformer A STAGE STAGE BOIL OUT ZONE 1 2 SEN SEN CONTROL WIRING NEEDED ONLY IF PRIORITY ZONE IS DHW INDIRECT WATER HEATER AQUASTAT OR THERMOSTAT THERMOSTATS (24 VAC) SWITCH SETTINGS BOILER SENSOR FACTORY INSTALLED TRANSFORMER 120 VAC INPUT BLACK A 24 VAC X X X X A B C R W C R W C R W C R W C R W C R W C 1 2 MAIN PRIORITY EXPANSION ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
HAFC101-4 with 1 Speed Air Handler THERMOSTAT T Optional Power Wire to Thermostat that Requires 24VAC To: Aquastat on Return Line of Hydro Coil C R W Y G THERMOSTAT T T AQUASTAT HAFC101-4 HYDRO AIR FAN CONTROL LED INDICATORS POWER HEAT CALL COOL FAN HEAT FAN BOILER AIR HANDLER X X C R Y G G L H HAFC101-4 24 VAC JUMPER FAN RELAY LINE Dry Contacts To: “T T” on Boiler or Switching Relay OUTDOOR CONDENSER UNIT M HAFC 101 WITH 1 SPEED AIR HANDLER (Both HFC 101 and HAFC 201 are capable of 1 and 2
HAFC101-4 with 2 Speed Air Handler THERMOSTAT T Optional Power Wire to Thermostat that Requires 24VAC To: Aquastat on Return Line of Hydro Coil C R W Y G THERMOSTAT T T AQUASTAT HAFC101-4 HYDRO AIR FAN CONTROL LED INDICATORS POWER HEAT CALL COOL FAN HEAT FAN BOILER AIR HANDLER X X C R Y G G H HAFC101-4 Dry Contacts To: “T T” on Boiler or Switching Relay LINE HIGH LOW 24 VAC L FAN RELAY OUTDOOR CONDENSER UNIT M HAFC 101 WITH 2 SPEED AIR HANDLER (Both HFC 101 and HAFC 201 are capable of 1 a
HAFC201-4 with 1 Speed Air Handler To: Optional Aquastat on Return Line of Hydro Coil THERMOSTAT T To: Optional Aquastat or Thermostat to sense low ambient temperature Optional Power Wire to Thermostat that Requires 24VAC T T T T WATER FREEZE COIL PROT. C R W Y G THERMOSTAT AQUASTATS HAFC201-4 HYDRO AIR FAN CONTROL LED INDICATORS POWER OFF NOTE: For 4 minute ON DELAY of Heating Fan, switch 1 and 3 MIN ON DELAY to ON position.
HAFC201-4 with 2 Speed Air Handler To: Optional Aquastat on Return Line of Hydro Coil THERMOSTAT T To: Optional Aquastat or Thermostat to sense low ambient temperature Optional Power Wire to Thermostat that Requires 24VAC T T T T WATER FREEZE COIL PROT. C R W Y G THERMOSTAT AQUASTATS HAFC201-4 HYDRO AIR FAN CONTROL LED INDICATORS POWER OFF NOTE: For 4 minute ON DELAY of Heating Fan, switch 1 and 3 MIN ON DELAY to ON position.
49 BOILER T T AQUASTAT TO: "TT" ON BOILER M H FAN RELAY COM R W R ZR H M H FUSE 6 AMP FAN RELAY LED INDICATORS W R W R W FUSE 6 AMP FUSE 6 AMP ZONE1 ZONE2 ZONE3 ZONE4 N H N H N H N H N H 120 VAC To: Aquastat on Return Line of Hydro Coil ZONE 4 ZONE 3 ZONE 2 ZONE 1 POWER SR 504-4 FUSE 6 AMP ON OFF ZONE 4 PRIORITY LED INDICATORS OUTDOOR CONDENSER UNIT HAFC101-4 HEAT FAN COOL FAN HEAT CALL POWER TWO SPEED AIR HANDLER L FOUR ZONE SWITCHING RELAY FUSE 6 AMP JUMPER
New Expandable Switching Relay Connected to an Older Expandable Switching Relay SWITCH SETTINGS Master/Slave: Master Priority Zone: Off Reset/Normal: Normal THERMOSTATS T SLAVE (EXISTING CONTROL) SLAVE PLUG-IN CARDS 1234 ZONE 4 PRIORITY ON OFF MASTER POWER CONTROL INTERFACE ZONE 1 ZONE 2 ZONE 3 ZONE 4 FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY RESET NORMAL POWER ZONE 1 ZONE 2 ZONE 3 ZONE 4 24 VAC POWER 120V RELAY X X SR 504-EXP ZC ZR END SWITCH ZONE1 ZONE2 ZONE3 ZONE4 POWER INPUT
New Expandable Zone Valve Control Connected to an Older Expandable Zone Valve Control NOTE 1: Terminals C are for optional 24V thermostat COMMON connections.
SR504-EXP Switching Relay Connected to a MOD–CON Boiler DHW DEMAND INDIRECT WATER HEATER AQUASTAT OR THERMOSTAT THERMOSTATS MOD-CON BOILER NOTE 1: Terminals C are for optional 24V thermostat COMMON connections.
53 BOILER SLAVE ZC H ZR H 120 VAC FUSE 6 AMP OFF PRIMARY CIRCULATOR (OPTIONAL) LOW LIMIT (ZC) ON X X X X FUSE 6 AMP ACCESSORY PORT FUSE 6 AMP END SWITCH R W C tn4 R W C tn4 ZONE 2 ZONE 3 FUSE 6 AMP PRIMARY ZONE1 ZONE2 ZONE3 ZONE4 ZONE4 N H N H N H N H N H N H PRIORITY N/C FUSE 6 AMP FUSE 6 AMP N H INPUT 120 VAC FOUR ZONE EXPANDABLE SWITCHING RELAY THERMOSTATS (24 VAC) ZONE 1 NET N H 120 VAC INPUT ZONE 4 ZONE 3 ZONE 2 ZONE 1 POWER LED INDICATORS PRIORITY ZONE 4 A B C R
BOILER H 120 VAC INPUT N 120 VAC INPUT BLACK WHITE 120 VAC INPUT BLACK WHITE TO: “TT” ON BOILER A B FACTORY INSTALLED TRANSFORMER FACTORY INSTALLED TRANSFORMER 24 VAC 24 VAC X ZONE 4 PUMP END SWITCH DRY CONTACTS R W C tn4 R W C tn4 2 WIRE ZONE VALVE (NO END SWITCH) MUST USE JUMPER END SWITCH 4 WIRE ZONE VALVE (POWER OPEN, SELF CLOSING) MOTOR ZONE 3 1 2 3 4 Powered from Transformer A TACO 3 WIRE ZONE VALVE 1 2 3 JUMPER 3&4 ZONE 1 ZONE 2 1 2 3 4 1 2 3 4 24 VAC ZONE VALVES VALVE 4
SR503-EXP Switching Relay Controlling a Standard (Non-Expandable) Switching Relay THERMOSTATS (24 VAC) TO: "TT" ON BOILER WITH DHW "TT" INPUT TO: "TT" ON BOILER AQUASTAT ON DHW HEATER A MASTER POWER CONTROLS SLAVE MASTER OFF PRIORITY ON RESET PRIMARY PUMP ON POST PURGE ON PRIORITY PROTECT ON PUMP EXERCISE ON 30 SEC/2 WK LOW LIMIT (ZC) ON NORMAL X X X X OFF MAIN PRIORITY EXPANSION OFF OFF OFF 4 MIN/24 HOUR END SWITCH OFF A B C R W C R W C R W C 1 2 ZONE 1 ZONE 2 THERMOSTATS NET ZONE 3 PR
ZVC404-EXP Zone Valve Control Controlling a Standard (Non-Expandable) Switching Relay Powered from Transformer A Powered from Transformer B INDIRECT WATER HEATER AQUASTAT OR THERMOSTAT TO: “TT” ON BOILER WITH DHW “TT” INPUT THERMOSTATS (24 VAC) TO: “TT” ON BOILER NOTE 1: Terminals C are for optional 24V thermostat COMMON connections.
ZVC404-EXP Zone Valve Control Controlling a Standard (Non-Expandable) Zone Valve Control Powered from Transformer A TO: “TT” ON BOILER WITH DHW “TT” INPUT Powered from Transformer B THERMOSTATS (24 VAC) NOTE 1: Terminals C are for optional 24V thermostat COMMON connections.
3 Wire Thermostat Connected to TACO Non-Expandable Switching Relay 3 WIRE THERMOSTAT THERMOSTATS T COM TO: "TT" ON BOILER T T T BOILER 24 VAC X X W R R W R W R ZONE 4 PRIORITY W ON OFF ISOLATED ZONE 1 ZONE 2 ZONE 3 ZONE 4 END SWITCH THERMOSTATS (24 VAC) PRIORITY COM LED INDICATORS FOUR ZONE SWITCHING RELAY POWER ZONE 1 FUSE 6 AMP FUSE 6 AMP FUSE 6 AMP FUSE 6 AMP ZONE 2 FUSE 6 AMP ZONE 3 ZONE 4 120 VAC 120 VAC CIRCULATORS PRIORITY INPUT ZC H ZR H ZONE1 ZONE2 ZONE3 ZONE4 N H N H
59 120 VAC INPUT BLACK WHITE 120 VAC INPUT BLACK WHITE A B FACTORY INSTALLED TRANSFORMER FACTORY INSTALLED TRANSFORMER 24 VAC 24 VAC X ZONE 5 PUMP END SWITCH N/O COM N/C DRY CONTACTS TO CIRCULATOR X PUMP END SWITCH FUSE 5 AMP FUSE 5 AMP “R” TT SCREW (SEE NOTE) T T 3 WIRE ZONE VALVE (TACO TYPE) Powered from Transformer A WHITE-ROGERS 1361 HYDRONIC ZONE VALVE 2 1 4 3 1 2 3 ZONE 4 1 2 3 4 MOTOR END SWITCH PRIORITY ZONE JUMPER 3&4 ZONE 5 1 2 3 4 PRIORITY Powered from Transform
120 VAC INPUT BLACK WHITE 120 VAC INPUT BLACK WHITE A B FACTORY INSTALLED TRANSFORMER FACTORY INSTALLED TRANSFORMER 24 VAC 24 VAC X ZONE 5 PUMP END SWITCH DRY CONTACTS “R” TT SCREW (SEE NOTE) T T 3 2 6 4 1 Powered from Transformer A 3 WIRE ZONE VALVE (TACO TYPE) 1 2 3 ZONE 4 1 2 3 4 MOTOR END SWITCH PRIORITY ZONE JUMPER 3&4 ZONE 5 1 2 3 4 PRIORITY Powered from Transformer B 4 WIRE ZONE VALVE (HONEYWELL TYPE) ZONE 1 ZONE 2 ZONE 3 1 2 3 4 1 2 3 4 1 2 3 4 24 VAC ZONE VALVES FIVE
61 R W X X R C THERMO- END 24 VAC STAT SWITCH POWER A B 24 VAC 24 VAC PRIORITY ON CIRC. ON 120 VAC INPUT SYSTEM PUMP X X PUMP END SWITCH DRY CONTACTS N/O COM N/C ZONE 6 PUMP END SWITCH FUSE 5 AMP FUSE 5 AMP TO: BOILER AQUASTAT RELAY SYSTEM PUMP AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.
Radiant Mixing Block (RMB) Back of Control Boiler Operation Off-Enable On-Control Front of Control R C US 158033 Meets Class B: Canadian ICES FCC Part 15 Boiler Power: 120 V + 10% 50/60 Hz, 750 VA Var.
Radiant Mixing Block Connected to Zone Valve Control with System Pump Wired off the RMB N WHITE NOTE 1: Terminals C are for optional 24V thermostat COMMON connections.
X - Pump Block (XPB) Back of Control Boiler Operation Off-Enable On-Control Front of Control R C US 158033 Meets Class B: Canadian ICES FCC Part 15 Boiler Power: 120 V + 10% 50/60 Hz, 750 VA Var.
X - Pump Block Connected to Zone Valve Control THERMOSTATS (24VAC) T Boiler BLACK FUSE 5 AMP N H R W C R W C R W C R W C X X ZONE 1 ZONE 2 ZONE 3 ZONE 4 ISOLATED END SWITCH THERMOSTATS (24 VAC) PRIORITY ON OFF LED INDICATORS POWER ZVC 404 – 4 Back of Control FOUR ZONE ZONE VALVE CONTROL Pump ComSup Sys Com Boil Out Com Heat Dem Ret PRIORITY OFF ZONE 4 PRIORITY POWER IN 24 VAC 120 VAC INPUT WHITE Boiler Operation Off-Enable On-Control XPB NOTE 1: Terminals C are for optional 24V thermostat
Typical Radiant Floor to Water Heater Installation Domestic Hot Supply Cold Supply X-PUMP BLOCK Relief Valve Air Separator C MIX H Return ASSE 1017 Tempering Valve Exp. Tank RADIANT SYSTEM (Secondary Side of the System) Supply Check Valve Hot Cold WATER HEATER WARNING! A pressure relief valve and expansion tank must be installed on the secondary side in addition to any pressure relief valve and expansion tank which is installed on primary side of system.
iSeries Mixing Valve System Supply Sensor Boiler Return Sensor Back of Control Boiler Return Sensor (optional) BOILER SUPPLY SETBACK C POWER GREEN R BOILER SUPPLY OUTDOOR 24 VAC POWER INPUT SENSOR ERROR RED SENSOR COMMON Setback Input Back of Control System Supply Sensor C POWER GREEN R 24 VAC POWER INPUT SENSOR ERROR RED SENSOR COMMON Outdoor Sensor 24 V (ac) or Transformer (Constant Power) End Switch End Switch 24 V (ac) or Transformer (Constant Power) iValve-S iValve-R iValve, 2
iValve, 3-Way Mixing Working with SR502/503 Switching Relay with DHW Priority INDIRECT WATER HEATER AQUATSTAT OR THERMOSTAT THERMOSTATS (24VAC) T T X X 24 VAC BACK OF iVALVE-R MIXING VALVE ACTUATOR Power Input H 24 VAC POWER INPUT SENSOR COMMON W R ZONE 3 PRIORITY W ON OFF LED INDICATORS COM THREE ZONE SWITCHING RELAY POWER N ZONE 1 FUSE 6 AMP C R FUSE 6 AMP FUSE 6 AMP FUSE 6 AMP ZONE 2 ZONE 3 24 Volt BOILER POWER SUPPLY GREEN OUTDOOR W R ISOLATED ZONE 1 ZONE 2 ZONE 3 PRIORITY END
Wiring for Boilers with Honeywell Control Center Model R8285 or Equivalent TACO LTR0243T-1 WH RED YEL GRN YEL FACTORY WIRING FEMALE CONNECTOR MALE CONNECTOR GROUND CONNECTION Alternate Wiring TACO LTR0243T-1 WH RED YEL GRN YEL 24 VAC CLASS 2 TRANSFORMER LIMIT CONTROLS HOT 120 VAC 24 VAC GAS VALVE COMMON 69
Wiring Boilers with a United Technologies Integrated Control Module and a Taco LTR0243U-1 INTEGRATED BOILER CONTROL MALE CONNECTOR FEMALE CONNECTOR FACTORY WIRING BOILER MODULE WIRING HARNESS Wiring Boilers with a United Technologies Ucontrol or other Integrated Control Modules which accept a 4-pin harness and a Taco LTR0243L-1 4-PIN CONNECTOR (#1) 4-PIN CONNECTOR (#2) INTEGRATED CONTROL MODULE WIRING HARNESS Wiring Instructions 1.
Wiring Taco LN and LTA-2 Series Low Water Cutoffs Using Burner Circuit Power Source * *Factory Installed NOTE: For 24 VAC models, LNA024xx and LTA0243S-2, 24 VAC to be supplied by an EXTERNAL Class 2 power source to terminals H and N. For 120 VAC models, LNA120xx and LTA1203S-2, 120 VAC is supplied by an external circuit to terminals H and N.
Wiring Taco LT Series (1st generation, -1) Low Water Cutoffs Using Burner Circuit Power Source * *Factory Installed NOTE: For 24 VAC models, LTx024xx-1, 24 VAC to be supplied by an EXTERNAL Class 2 power source to terminals H and N. For 120 VAC models, LTx120xx-1, 120 VAC is supplied by an external circuit to terminals H and N.
Wiring Taco LF Series Low Water Cutoffs Using Burner Circuit Power Source NOTE: Remote probe available on remote probe models only. NOTE: For 24 VAC models, LFx024xx, 24 VAC to be supplied by an EXTERNAL Class 2 power source to terminals H and N. For 120 VAC models, LFx120xx, 120 VAC is supplied by an external circuit to terminals H and N.
Taco Low Water Cutoff Replacement Guide Taco Hydrolevel Honeywell LFA1203S-1 LTA1203N-1 LTA1203S-1 PS-801-120 PS-800-120 PS-850-120 900 900C 450 CG450 650 650SV OEM170C OEM170TD RW700A1031 RW700A1056 RW700A1080 LFM1203S-1 LTM1203N-1 LTM1203S-1 PS-801-M-120 PS-851-M-120 PS-851-SP-M-120 PS-850-M-120 900M 901M 902M 550 550SV 750 OEM170MC OEM170M RW700B1054 RW700B1039 RW700B1021 PS-802-24 PS-800-24 PS-850-24 400 CG400 600 600SV OEM24C OEM24TD RW700A1098 LFA0243S-1 LTA0243N-1 LTA0243S-1 LFM0243S-1
Taco LF Series 120 Volt LWCO Competitive Wiring Cross Reference 120 VAC Models with 120 VAC Burner Circuits McDONNELL & MILLER PS-801/851-120 w/Red & Amber LEDs Series 750 TACO LFx120x NC NO COM H N GND P 1 2 3 4 5 HOT HOT BURNER CIRCUIT 120 VAC CIRCUIT FACTORY INSTALLED JUMPER BURNER CIRCUIT 120 VAC CIRCUIT NEUTRAL NEUTRAL McDONNELL & MILLER PS-801/851-120 w/Red & Green LEDs HYDROLEVEL 450, 550, 650 & 750 2 1 P1 P2 N A HOT H C W B HOT BURNER CIRCUIT 120 VAC CIRCUIT BURNER CIR
Taco LF Series 24 Volt LWCO Competitive Wiring Cross Reference 24 VAC Models with 24 VAC Burner Circuits TACO LFx024x NC NO COM H N GND P HOT BURNER CIRCUIT 24 VAC CIRCUIT FACTORY INSTALLED JUMPER NEUTRAL McDONNELL & MILLER PS-802/852-24 HYDROLEVEL 400, 500, 600 & 700 2 1 P1 P2 N A HOT H C W B HOT BURNER CIRCUIT 24 VAC CIRCUIT BURNER CIRCUIT 24 VAC CIRCUIT NEUTRAL NEUTRAL 24 VAC Models with 120 VAC Burner Circuits TACO LFx024x NC NO COM H N GND P HOT BURNER CIRCUIT 120 V
Taco LTA-2 Series 120 Volt LWCO Competitive Wiring Cross Reference 120 VAC Models with 120 VAC Burner Circuits McDONNELL & MILLER RB-120 TACO LTA1203S-2 N H COM NC NO 1 HOT 2 3 4 5 HOT 120 VAC CIRCUIT FACTORY INSTALLED JUMPER BURNER CIRCUIT BURNER CIRCUIT 120 VAC CIRCUIT NEUTRAL NEUTRAL McDONNELL & MILLER RB-122E N H B HYDROLEVEL 1150 H C HOT N HYDROLEVEL 170 CUT-OFF GN HOT BURNER CIRCUIT 120 VAC CIRCUIT P1 P2 A HOT BURNER CIRCUIT 120 VAC CIRCUIT NEUTRAL H BURNER CIRCUI
Taco LTR and LTA-2 Series 24 Volt LWCO Competitive Wiring Cross Reference 24 VAC Models with 24 VAC Burner Circuits McDONNELL & MILLER RB-24E TACO LTA0243S-2 N COM NC H Red White Yellow Yellow Wire Wire Wire Wire NO HOT HOT 24 VAC CIRCUIT BURNER CIRCUIT FACTORY INSTALLED JUMPER NEUTRAL NEUTRAL TACO LTR0243T-1 HYDROLEVEL 1100 Red White Yellow Yellow Wire Wire Wire Wire Red White Yellow Yellow Wire Wire Wire Wire HOT 24 VAC CIRCUIT BURNER CIRCUIT 24 VAC CIRCUIT 24 VAC CIRCUIT NEUTRAL 2
Wiring Taco LF Series Low Water Cutoffs to Taco Electric Water Feeder with the Same Voltages EWF Standard Wiring Taco LFx120x / L F x024x NC NO COM H N GND P HOT BURN ER C IR C U IT FACTORY INSTALLED JUMPER 120 V AC / 24 V A C C I R C U IT NEUTRAL LW N H Taco E W F 120 /E W F 024 Wiring Taco LF Series Low Water Cutoffs to Taco Electric Water Feeder with Different Burner Voltages EWF Alternate Wiring T a c o L F x 02 4 x T a co L F x1 2 0 x NC NO COM H * B UR NE R CI RC UI T N GND
Wiring Taco 24VAC Electric Water Feeder to Taco LF Series 24VAC Low Water Cutoff or 24VAC McDonnell & Miller or Hydrolevel Low Water Cutoffs M c D o n n e l l & M il l e r P S -8 0 2 /8 5 2 -2 4 B W C H N H yd ro le v e l 400, 50 0, 600, & 700 P2 A P1 1 2 Taco LFx024x NC NO COM H N GND P HOT B UR N E R C IR C U IT ** Ma y be fa ctory installed on som e L W C O s 24 V A C C IR C U IT INSTALLED JUMPER ** N O T E : Wiring s hown only for control an d burner circuits of the sam e volta
Wiring TACO LTA-2 or LF Series 24VAC Low Water Cutoff to McDonnell & Miller Series WF2 Uni-Match Electric Water Feeder SWITCH POSITION #2 1 UNI-MATCH WATER FEEDER MODEL WF2-U-24 24VAC SUPPLY 50/60 Hz 2 3 0R W N M&M 2 3 H N Note on switch position: H BURNER N H If using the LTA-2 series, choose whichever position best matches the application: NC NO COM Switch setting 1 (M&M), the feed cycle repeats indefinitely. Position 2 and 3 gives one feed cycle.
Wiring TACO LF Series 24VAC Low Water Cutoff to Hydrolevel VXT-24 Water Feeder (Non-Display Model) Set Safgard as desired. SAFGARD VXT-24 WATER FEEDER WHITE BLACK N 24VAC SUPPLY 50/60 Hz H Remove jumper between H and COM if using power source other than burner circuit or when using mixed voltages. BURNER N H COM NC NO AC POWER OUTPUT CONTACTS Do not connect feeder to a manual reset LWCO.
Wiring TACO LTA-2 or LF Series 24VAC Low Water Cutoff to Hydrolevel VXT-24 Programmable Water Feeder (Model with Display) Set Safgard as desired. SAFGARD VRTX-24 WATER FEEDER WHITE 24VAC SUPPLY 50/60 Hz BLACK RED N H Remove jumper between H and COM if using power source other than burner circuit or when using mixed voltages. BURNER N H COM NC NO AC POWER OUTPUT CONTACTS Do not connect feeder to a manual reset LWCO.
RB-120 RB-24 24 170 1100 1150 McDonnell & Miller McDonnell & Miller Hydrolevel Hydrolevel Hydrolevel Hydrolevel Hydrolevel Hydrolevel RW700A1098 400, 500, 600, 700, 450, 550, 650, 750 RW700 Series (Except RW700A1098) RB-122 McDonnell & Miller Hydrolevel Series 750 McDonnell & Miller McDonnell & Miller McDonnell & Miller McDonnell & Miller PS-801/851 (Older Models w/Red & Amber LEDs) PS-801/851 (New Models w/Red & Green LEDs) PS-802/852 (Older Models w/Red & Amber LEDs) PS-802/852 (Ol
Aquastat Wiring L1 (HOT) L2 (NEUTRAL) 120 VAC INPUT L1 T L2 T END SWITCH C1 B2 TACO ZONE CONTROL ZC C2 ZR B1 CIRCULATOR ON BOILER (IF ATTACHED) HONEYWELL L8124A & C OR EQUAL LINE VOLTAGE OIL BURNER RELAY OR GAS VALVE MILLI-VOLTAGE GAS VALVE B1 T B2 T END SWITCH TACO ZONE CONTROL C L1 L1 (HOT) TV L2 CIRCULATOR ON BOILER (IF ATTACHED) C2 L2 (NEUTRAL) 120 VAC INPUT HONEYWELL L8124B OR EQUAL Z T END SWITCH TACO ZONE CONTROL CIRCULATOR ON BOILER (IF ATTACHED) B1 C1 C2 L1 L
Aquastat Wiring TV Z T END SWITCH L1 ZC ZR B1 L2 B2 C2 C1 LINE VOLTAGE OIL BURNER RELAY OR GAS VALVE 120 VAC INPUT L1 (HOT) CIRCULATOR ON BOILER (IF ATTACHED) L2 (NEUTRAL) L1 (HOT) TACO ZONE CONTROL HONEYWELL L8124G & L OR EQUAL L2 (NEUTRAL) 120 VAC INPUT L1 T L2 T END SWITCH B2 C1 ZC C2 ZR B1 CIRCULATOR ON BOILER (IF ATTACHED) L1 (HOT) TACO ZONE CONTROL HONEYWELL L8124M OR EQUAL LINE VOLTAGE OIL BURNER RELAY OR GAS VALVE L2 (NEUTRAL) 120 VAC INPUT L1 T L2 T END SWITCH
Aquastat Wiring TV T W END SWITCH CIRCULATOR ON BOILER (IF ATTACHED) Z B1 C1 C2 L1 L2 B2 W TP Z 120 VAC INPUT L1 (HOT) LOW VOLTAGE GAS VALVE TV L2 (NEUTRAL) HONEYWELL L8148E OR EQUAL T END SWITCH MILLIVOLTAGE GAS VALVE B1 B2 C1 C2 L1 L2 B3 L1 (HOT) TACO ZONE CONTROL CIRCULATOR ON BOILER (IF ATTACHED) LOW VOLTAGE GAS VALVE OR TACO ZONE CONTROL L1 (HOT) 120 VAC INPUT L2 (NEUTRAL) HONEYWELL L8148J OR EQUAL L2 (NEUTRAL) 120 VAC INPUT L1 B1 L2 B2 C2 OIL BURNER AND IGN
Aquastat Wiring L1 (HOT) L2 (NEUTRAL) 120 VAC INPUT L1 T L2 T T ZC THERMOSTAT (IF INDEPENDENT ZONE) C1 B2 ZR N H ZC C2 ZR B1 CIRCULATOR ON BOILER (IF ATTACHED) HONEYWELL L8124A & C OR EQUAL LINE VOLTAGE OIL BURNER RELAY OR GAS VALVE THERMOSTAT (IF INDEPENDENT ZONE) T TV TACO SWITCHING RELAY X X END SWITCH TACO SWITCHING RELAY Z T X X END SWITCH ZC L1 ZC ZR B1 L2 B2 C2 C1 120 VAC INPUT CIRCULATOR ON BOILER (IF ATTACHED) L2 (NEUTRAL) L1 (HOT) ZR N H LINE VOLTAGE O
Aquastat Wiring L1 (HOT) 120 VAC L2 (NEUTRAL) INPUT L1 T L2 T R B2 3 W THERMOSTAT (IF INDEPENDENT ZONE) T ZC B B L6006 LOW LIMIT CONTROLER TACO SWITCHING RELAY X X END SWITCH ZR N H R C1 C2 B2 B1 LINE VOLTAGE OIL BURNER RELAY OR GAS VALVE CIRCULATOR ON BOILER (IF ATTACHED) L1 (HOT) L2 (NEUTRAL) 120 VAC INPUT L1 HONEYWELL L8148A OR EQUAL B1 L2 B2 C2 C1 ZC OIL BURNER AND IGNITION TACO SWITCHING RELAY X X END SWITCH CIRCULATOR ON BOILER (IF ATTACHED) ZC ZR N H ZR T T
Wiring for Boilers with Honeywell Aquastat Model L8124E or Equivalent FACTORY WIRING (unplug from B1 terminal) TACO LTR0243T-1 WH RED YEL GRN YEL TV Z T CIRCULATOR ON BOILER (IF ATTACHED) HONEYWELL L8124E B1 C1 C2 L1 L2 MALE CONNECTOR B2 G L1 (HOT) FEMALE CONNECTOR L2 (NEUTRAL) 120 VAC INPUT NOTE: The green wire must be connected to a ground source electrically common to the boiler ground.
Aquastat Wiring to 24VAC Low Water Cutoff TO THERMOSTAT TACO LNA024 or LTA024-2 N TV COM NC NO HONEYWELL L8148E T W H Z B CIRCULATOR ON BOILER (IF ATTACHED) R B1 C1 C2 L1 L2 B2 SPILL SWITCH L1 (HOT) G L2 (NEUTRAL) 120 VAC INPUT LOW VOLTAGE GAS VALVE Aquastat Wiring to 120VAC Low Water Cutoff TO THERMOSTAT TACO LNA120 OR LTA120-2 N TV COM NC NO HONEYWELL L8148E T W H Z CIRCULATOR ON BOILER (IF ATTACHED) B R B1 C1 C2 L1 L2 B2 G SPILL SWITCH LOW VOLTAGE GAS VALVE L1
Instruction Sheet SR501-4 Switching Relay Features: Typical Wiring External Indicator Lights Universal Replaceability Snap-in PC Board Simplified Wiring Sealed Relays Fuse Protected Outputs 100% Factory Tested Contractor Friendly PC Board Layout Universal Thermostat Compatibility UL Approved Extended 3 Year Warranty Made in the USA Alternative Wiring THERMOSTAT R W T T THERMOSTAT 24 VAC R W T T COM ONE ZONE SWITCHING RELAY FUSE 6 AMP 24 VAC COM ONE ZONE SWITCHING RELAY LED INDICATORS LED INDI
Instruction Sheet SR501-HC-4 Switching Relay, High Current Features: External Indicator Lights Simplified Wiring Sealed Relays 100% Factory Tested Contractor Friendly PC Board Layout Universal Thermostat Compatibility UL Approved Extended 3 Year Warranty Made in the USA Typical Wiring 24 VAC THERMOSTAT 24 R W1 W2 VAC T T T COM ONE ZONE HC SWITCHING RELAY POWER 120 VAC Application: 1 zone switching relay with boiler enable or 2 zone without boiler enable.
SR501-HC-4 Switching Relay Instruction Sheet (page 2) THERMOSTAT #1 (24 VAC) THERMOSTAT #2 (24 VAC) 24 VAC THERMOSTAT 24 R W1 W2 VAC T T T COM 24 R W1 W2 VAC COM T T T ONE ZONE HC SWITCHING RELAY ONE ZONE HC SWITCHING RELAY LED INDICATORS LED INDICATORS POWER POWER RELAY 1 RELAY 1 RELAY 2 RELAY 2 SR 501-HC-4 SR 501-HC-4 120 VAC INPUT 120 VAC INPUT RELAY 1 RELAY 2 RELAY 1 RELAY 2 N H X1 X1 X2 X2 N H X1 X1 X2 X2 CIRCULATOR #2 (120 VAC) POWER INPUT (120 VAC) CONTROL POWER INPUT (120 VAC)
Instruction Sheet SR501-OR-4 Switching Relay with Outdoor Reset APPLICATION: THERMOSTATS (24VAC) The SR501-OR is a microprocessor-based control designed to regulate the supply water temperature of a single boiler, based on the outdoor temperature. The SR501-OR is a boiler reset control and switching relay in one unit. The SR501-OR is ideal for retrofit application, but may also be used in new installations as well.
SR501-OR-4 Switching Relay Instruction Sheet (page 2) Boiler Operation: on Bo iler on Boi ler Supply Water Temperature 155°F (6 8°C) Time 210 (99) 170 (77) 150 (65) 130 (54) Boiler Minimum 110 (43) Reset Ratio 90 (32) Supply Water Temperature 190 (88) WWSD Temperature Minimum Boiler Supply: Most boilers require a minimum supply water temperature in order to prevent corrosion from flue gas condensation.
SR501-OR-4 Switching Relay Instruction Sheet (page 3) Step Two: Step Three: Installing the Control: Wiring to the Zone Control: The enclosure is to be mounted flush onto a wall or any ridge surface. • The mounting holes in the enclosure accept #6 screws. • Line voltage to enter from bottom of control and low voltage to enter from top of control. Installing the Outdoor Sensor: Note: The temperature sensor (thermistor) is built into the enclosure.
SR501-OR-4 Switching Relay Instruction Sheet (page 4) TROUBLESHOOTING: Step Five: Testing the Sensors: As in any troubleshooting procedure, it is important to isolate a problem as much as possible before proceeding. The blinking error LED light greatly simplifies troubleshooting of the SR501-OR. If you suspect a wiring fault, return to step three and carefully check all external wiring and wiring connections.
Instruction Sheet SR502/503/504/506-4 Switching Relay Cold Start Boiler Application Tankless Coil Boiler Application (Alternative Wiring) THERMOSTATS TO: "TT" ON BOILER 24 VAC X X R W R W W R R W R W R W ISOLATED ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6 END THERMOSTATS (24 VAC) PRIORITY SWITCH COM ZONE 6 PRIORITY ON OFF 24 VAC X X R W R W W R R W R R W W ISOLATED ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6 END THERMOSTATS (24 VAC) PRIORITY SWITCH LED INDICATORS COM SIX ZONE SWI
Instruction Sheet SR501-EXP-4 Switching Relay Operation: When the thermostat calls for heat, the circulating pump is energized and the isolated end switch (X and X) will start the boiler. Priority Operation: When the priority dip switch is set to ON and the zone is actuated, all other connected zoning panels will stop operation until the zone is satisfied. When the priority dip switch is set to OFF and the zone is actuated, all other connected zoning panels will operate independently.
Instruction Sheet SR503-EXP, SR504-EXP & SR506-EXP Switching Relay Operation: When any thermostat calls for heat, the appropriate circulating pump is energized and the isolated end switch (X and X) will start the boiler. Priority Operation: When the priority dip switch is set to ON and the priority zone is actuated, all other zones will stop operation until priority zone is satisfied. When not switched to priority, all zones will operate independently.
Instruction Sheet ZVC403/404/405/406-4 Zone Valve Control Wiring Diagram Powered from Transformer A Powered from Transformer B THERMOSTATS (24VAC) WHITE 120 VAC INPUT BLACK T T See NOTE 1 ZONE 6 PRIORITY A POWER IN 24 VAC FACTORY INSTALLED TRANSFORMER TO: BOILER AQUASTAT RELAY INDIRECT WATER HEATER AQUASTAT OR THERMOSTAT 24 VAC R W C R W C R W C R W C R W C R W C X X ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6 ISOLATED END SWITCH THERMOSTATS (24 VAC) PRIORITY FUSE 5 AMP FUSE 5 AMP FACTORY INST
Instruction Sheet ZVC404-EXP & ZVC406-EXP Zone Valve Control Wiring Diagram Powered from Transformer A TO: "TT" ON BOILER WITH DHW "TT" INPUT Powered from Transformer B THERMOSTATS (24 VAC) INDIRECT WATER HEATER AQUASTAT OR THERMOSTAT 120 VAC INPUT BLACK POWER CONTROLS A 24 VAC X X X X A B C R W C R W C R W C R W C R W C R W C 1 2 MAIN PRIORITY EXPANSION ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6 NET END SWITCH THERMOSTATS (24 VAC) PRIORITY FUSE 5 AMP POWER IN 24 VAC WHITE FACTORY INSTALLED TRAN
Instruction Sheet Hydro Air Fan Controls Operation HAFC101 and 201: T T HAFC101-4 HYDRO AIR FAN CONTRL X 1 MIN FAN DELAY 3 MIN FAN DELAY PUMP EXERCISE PUMP X LED INDICATORS POWER HEAT CALL H2O COIL COOL FAN HIGH FAN LOW FAN HEAT FAN ON WARNING: Wiring connections must be made in accordance with all applicable electrical codes. Use copper wire only. 120 VAC wiring must have a minimum temperature rating of 75°C.
Standard Terms and Definitions Switching Relay: Transformer and relay in one box, which allows a low voltage thermostat to control a line voltage load (circulator), with an isolated end switch that can energize the boiler. Zone Valve Control: Transformer and relay in one box, which allows a low voltage thermostat to control a low voltage zone valve, with an isolated end switch that can energize the boiler and/or circulators.
106 Zone Zone Zone Zone Zone Zone Zone Switching Switching Switching Switching Switching Switching Switching Relay Relay Relay Relay Relay Relay Relay with with with with with Outdoor Reset Priority Priority Priority Priority (DPDT) Zone Zone Zone Zone Switching Switching Switching Switching Relay Relay Relay Relay with with with with Priority Priority Priority Priority Zone Valve Zone Valve Zone Valve Zone Valve Control Control Control Control with with with with Priority Priority Priority P
ARH-1, ARH-2, ARH-3 DPM-2 ARGO AQ25400B BB3000 WA300 AQ25110B BB1200 ERIE 1. Does not have both normally open and normally closed contacts. 2. Has only one set of normally open contacts (SPST). 3. Does not have optional priority. 4. Can be expanded to five and six zones with the addition of EXP10 relays. 5. Argo ARM units are expandable to 10 zones using special controls (ARM-1, ARM-4) with a phone jack.
CONTROLS MADE EASY.® TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360. TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436. Visit our web site at: http://www.taco-hvac.com Printed in USA Copyright 2010 TACO, Inc.