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Taco SR502-5 Instruction Sheet

Switching relay
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SUPERSEDES: NEW
Plant ID No. 9300-4099
OVERVIEW:
The "SR50X-5" refers to a model number where "X" represents the number of control zones. Model number "SR506-5" is used for reference
in this document. 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 in boiler and primary loops, for example.
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 when
using an indirect water heater.

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5. Product & Application Diagrams
SR502/503/504/506-5 Switching Relay
7.
8.
9.
Instruction Sheet
EFFECTIVE: 10/11/24
The SR506-5 includes timing options for
Post Purge, Pump Exercise and Priority
Protection. The SR506-R-5 also includes
an energy saving program that can
adjust the temperature of a modulating-
condensing boiler or conventional On/
Off boiler to increase the comfort level
and use less fuel, without the need to
install an outdoor sensor. It also supports
Outdoor Reset (Weather Compensation)
when outdoor sensor is connected (or
separately purchased Plug-In Reset
Control for standard SR506-5 model).
For information on Taco's Switching
Relays (SR) including catalog, instruction
sheets, submittal data sheets, and our
highly praised Zone Controls Wiring
Guide, scan the QR code below or visit
www.TacoComfort.com.
102-571
1

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Summary of Contents for Taco SR502-5

  • Page 1: Table Of Contents

    Outdoor Reset (Weather Compensation) when outdoor sensor is connected (or separately purchased Plug-In Reset Control for standard SR506-5 model). For information on Taco’s Switching Relays (SR) including catalog, instruction sheets, submittal data sheets, and our highly praised Zone Controls Wiring Guide, scan the QR code below or visit www.TacoComfort.com.

  • Page 2: Warnings And Safety Information

    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.

  • Page 3: Location And Installation

    2. LOCATION & INSTALLATION: Planning: Included in Package: SR506-5 switching relay; 6 zone Quick Start Guide SR506-R-5 switching relay also includes: Strap-on temperature sensor 2 Spare fuses attached to inner cover Tools & Materials Needed: Small straight blade screwdriver Screws or hardware for mounting Phillips screwdriver Electrical connectors for field wiring Torpedo level...

  • Page 4: Operation & Dip Switch Settings

    Pump Exercise Operation: When the DIP switch (#5) is set to ON, the solid state timer cycles all the circulating pumps that are attached to the Switching Relay to run for 30 seconds every 2 weeks. More adjustments are available when using the Taco Control mobile app.

  • Page 5: Wiring Procedure

    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).
  • Page 6 DHW Recirculation using SmartPlus Logic SmartPlus Recirc Logic Sensor • Mount the strap-on sensor on domestic hot water supply pipe on water heater using wire tie or pipe clamp and insulate sensor with pipe insulation. • The sensor must be strapped to metal piping. A short piece of copper or brass tube should be added into non metallic systems for sensor attachment.

  • Page 7: Mechanical Diagram

    5. PRODUCT & APPLICATIONS DIAGRAMS: PA01C – SR506-5 with 5 Zone Circulators & Indirect DHW; Supply & Return Headers Mechanical Diagram C-ZV Electrical Diagram HEAT Note 1 Note 2 DIP Switch Settings 1. OFF - Master 2. ON - Priority 3.
  • Page 8 PA02C - SR506-5 with 5 Zone Circulators & Indirect DHW; Primary/Secondary Mechanical Diagram Note 3 Electrical Diagram Note 1 DIP SWITCH SETTINGS DIP SWITCH SETTINGS DIP SWITCH SETTINGS DIP SWITCH SETTINGS Master Master Master Master Expansion Expansion Expansion Expansion Priority On Priority On Priority On Priority On...
  • Page 9 PA03C – High & Low Temperature Zones & Indirect DHW; Primary/Secondary Electrical Diagram...
  • Page 10 PA04C – Boiler with Tankless Coil; Supply & Return Headers Mechanical Diagram LEGEND Electrical Diagram DIP Switch Settings 1. OFF - Master 2. OFF - Priority 3. OFF - Primary Pump 4. OFF or ON - Post Purge 5. OFF or ON - Pump Exercise DIP SWITCH SETTINGS DIP SWITCH SETTINGS DIP SWITCH SETTINGS...
  • Page 11 PA05C – Legacy Zone Controls – SR506-EXP-4 (Master) Connected to SR504-5 (Expansion) Electrical Diagram...
  • Page 12 PA06C – Legacy Zone Controls – SR504-5 (Master) Connected to SR506-EXP-4 (Expansion) Electrical Diagram...
  • Page 13 PA07C – Legacy Zone Controls – SR504-5 (Master) Connected to SR506-EXP-2 (Expansion) Electrical Diagram...
  • Page 14 PA07C – Legacy Zone Controls – SR506-EXP-4 (Master) with PC700-2 Boiler Reset Control Connected to SR504-5 (Expansion) Electrical Diagram...

  • Page 15: Reset Control Setup & Wiring

    Control Setup: The Taco Control mobile app is required to set type of reset control and parameters to operate. Wiring of Reset Control: Make all sensor and analog output connections to the small Plug-In Reset Control on SR506-R-5.

  • Page 16: Troubleshooting & Faqs

    7. TROUBLE SHOOTING & FAQs 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. This resistor should be placed between the W &...

  • Page 17: Specifications

    -58°F to 230°F (-50°C to 110°C) 24 VAC, 1A DIP Switch Timing Settings: Expansion Terminals: Low voltage, 3-wire Post Purge: 30 seconds; adjustable with Taco Control polarity-sensitive, digital communications that mobile app links other Switching Relays (SR-5), Zone Valve Controls (ZVC-5) and other Modbus equipment.

  • Page 18: Warranty

    Taco reserves the right to provide replacement products and parts which are substantially similar in design and functionally equivalent to the defective product or part. Taco reserves the right to make changes in details of design, construction, or arrangement of materials of its products without notification.

This manual is also suitable for:

Sr503-5Sr504-5Sr506-5

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