Wiring Guide

ManualsBrandsTaco Comfort Solutions ManualsElectronicsZone Controller

Table Of Contents

102-571

SUPERSEDES: New Plant ID # 9300-4099 EFFECTIVE: February 17,2021

For information on Taco’s Switching Relays (SR)

including catalog sheet, instruction sheets, Visio stencils

and our highly praised Zone Controls Wiring Guide, scan the QR code to the left or go

to our website:

www.TacoComfort.com.

Overview:

The SR506-5 is a six zone switching relay that can have up to 6 thermostats

connected and will operate up to 6 zone circulators, plus 2 auxiliary outputs (AUX) to

control circulators; like boiler and primary loops.

The SR506-5 has a priority zone option, allowing zone 1 to operate and deactivate

zones 2 through 6 during a priority call; this is ideal for when using an indirect water

heater.

The SR506-5 includes timing options for Post Purge, Pump Exercise and Priority

Protection. The SR506-5 includes an energy saving program that can adjust the

temperature of a modulating-condensing boiler or conventual On/Off boiler to

increase the comfort level and use less fuel, without the need to install an outdoor

sensor.

Table of Contents

1. Warnings & Safety Information

2. Location & Installation

3. Operation & Dip Switch Settings

4. Wiring Procedure

5. Product & Applications Diagrams

6. Reset Control Setup & Wiring

7. The Taco eLink mobile app

8. Troubleshooting & FAQ’s

9. Inner Cover Removal & Fuses

10. Specifications

11. Accessories & Replacement Parts

12. Warranty

Summary of content (16 pages)

PAGE 1
02-571 SUPERSEDES: New Plant ID # 9300-4099 EFFECTIVE: February 17,2021 For information on Taco’s Switching Relays (SR) including catalog sheet, instruction sheets, Visio stencils and our highly praised Zone Controls Wiring Guide, scan the QR code to the left or go to our website: www.TacoComfort.com.
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1. Warnings & Safety Information: FCC Regulatory Statements This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference. (2) This device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the Federal Communication Commission (FCC) rules.
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2. Location & Installation: Planning: Included in Package: SR506-5 switching relay; six zone Instruction sheet 2 Spare fuses attached to inner cover Strap-on temperature sensor Tools & Material Needed: Small straight blade screwdriver Screws or hardware for mounting Phillips screwdriver Electrical connectors for field wiring Torpedo level Low and live voltage wiring (per code) Wire strippers Location: Do not mount to a surface that exceeds 104°F (40°C).
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3. Operation & Dip Switch Settings: General Operation: When any thermostat calls for heat, the appropriate circulating pump is energized, the red light goes on and the boiler end switch relay and AUX circulator relay(s) are energized. Expansion Connections: Set dip switch (#1) to MASTER on the switching relay that is designated as the priority zone control. Set all other daisy chained zone controls to EXPANSION.
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4. Wiring Procedure: End Switches (Low Voltage Dry Contacts): Main The main end switch closes when any zone thermostat calls for heat and connects to T-T on boiler operating control. Priority The priority end switch closes only when the priority zone thermostat or aquastat is calling for heat and connects to DHW T-T on boiler (optional). Thermostat Input (24 vac): R W C Hot side of transformer. Connect to R on thermostat. Switched R signal from thermostat. Connect to W on thermostat.
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5. Product & Applications Diagrams: PA01-C - SR506-5 with 5 Zone Circulators & Indirect DHW; Supply & Return Headers Mechanical Diagram Electrical Diagram Dip Switch Settings 1. OFF - Master 2. ON - Priority 3. OFF - Primary Pump 4. OFF or ON - Post Purge 5. OFF or ON - Pump Exercise 6.
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PA02-C - SR506-5 with 5 Zone Circulators & Indirect DHW; Primary/Secondary Mechanical Diagram Electrical Diagram Dip Switch Settings 1. OFF - Master 2. ON - Priority 3. OFF - Primary Pump 4. OFF or ON - Post Purge 5. OFF or ON - Pump Exercise 6. OFF - ZC Low Limit Conceptual Sketches Only, refer to individual manufacture’s installation instructions for additional details.
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PA03-C –High & Low Temp Temperature Zones & Indirect DHW; Primary/Secondary Mechanical Diagram Electrical Diagram Dip Switch Settings;Master 1. OFF-Master 2. ON-Priority 3. OFF-PrimaryPump 4. OFFor ON-PostPurge 5. OFFor ON-PumpExercise 6. OFF-ZCLowLimit Conceptual Sketches Only, refer to individual manufacture’s installation instructions for additional details. Local codes shall prevail. Dip Switch Settings; Expansion 1. ON-Expansion 2. OFF-Priority 3. OFF-PrimaryPump 4. OFFor ON-PostPurge 5.
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PA04-C – Oil Fired Boiler with Tankless Coil; Supply & Return Headers Mechanical Diagram Electrical Diagram Dip Switch Settings 1. OFF-Master 2. OFF-Priority 3. OFF-PrimaryPump 4. OFFor ON-PostPurge 5. OFFor ON-PumpExercise 6. ON -ZCLowLimit Conceptual Sketches Only, refer to individual manufacture’s installation instructions for additional details. Local codes shall prevail. SAFETY NOTICE TWO SEPARATE sources of power may be connected to an oil boiler’s aquastat control.
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6. Reset Control Setup & Wiring (Optional) Boiler Reset Types: The ZVC406-5 includes two types of boiler reset control logic: Indoor Reset Control (Load Reset) uses the thermostat cycling information to determine the supply water temperature. Thermostat short cycling usually indicates supply water temperature is too high. Long on cycles usually indicates supply water temperature is too low.
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7. The Taco eLink Mobile App (Optional) Note: The Taco eLink mobile app is not required for standard installations. Advanced Control & Monitoring Options: The Taco eLink mobile app is required for advanced control functions and parameters to operate. Search for Taco eLink within the App Store or Google Play on your mobile device to download the mobile app.
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The eLink APP
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The eLink APP
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8. Trouble Shooting & FAQ’s For your convenience, the Taco Tech Support team is available anytime 24/7. Just call 401942-8000 for help. Problem: Digital thermostats do not work correctly when connected to a switching relay. Solution: Some thermostats are a “Power Stealing” type which means they are powered by the switching relay with just 2 wires (R & W). A resistor may be needed in order to have the thermostat work properly.
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10. Specifications: Power and Electrical Ratings: Power Supply: 120VAC ±10%, 60Hz, 20A Zone Pump Output Rating: 120 Vac, 1/6 HP AUX(s) Pump Output Rating: 120 Vac, 1/6 HP Boiler End Switch Contact Rating: 24 Vac, 1A, Boiler Modulating Output Rating: 0-10 VDC Mode; 500 Ω min impedance 4-20 mA Mode; 1k Ω max impedance Expansion Terminals: Low voltage, 3-wire polarity-sensitive, digital communications that links other Switching Relays (SR-5), Zone Valve Controls (ZVC-5) and other Modbus equipment.
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12. LIMITED WARRANTY STATEMENT Taco, Inc.