Smart Thermostatic Control 32
Installation Guide for Tank Water Heaters

Table of Contents

→Smart Thermostatic Control 32 for Tank Water Heaters Installation Guide

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Smart Thermostatic Control 32 for Tank Water Heaters – Installation Guide

Congratulations on purchasing the most advanced microprocessor-controlled, hot water recirculation pump controller made. This system is designed to run the recirculation pump only when you need it thus saving both water and energy. It is designed and built with pride in the USA to provide years of service and savings.

Mandatory system test at the beginning of the QuickStart Guide must be performed in order to receive installation support.

Unboxing Your Product

(1)        Smart Thermostatic Control 32 with RJ-45 connector

smart thermostatic control 32 for on demand hot water

(1)       Temperature Sensor with RJ-14 connector

Temperature Sensors with RJ-14 connectors and RJ-14 Splitter

(1)       ¾” or 1” NPT Flow Sensor with JST connector

NPT Flow Sensor with JST Connector

(1)       Wiring Harness with RJ-45, RJ-14 & JST connectors

Wiring Harness with RJ-45 RJ-14 JST connectors

Items Not Included: You will need the following items for installation that are not included. 

→ Electrical Tape
→ PTFE (Teflon) Tape
→ Wire fasteners for securing wiring to the wall

You may need.

→ One or more 3/4″ NPT couplers to connect the flow meter and/or pump depending on your installation.

QUICKSTART GUIDE

Before you begin

Perform the following system test.

  1. Connect the wiring harness to the controller.
  2. Connect the flow meter to the wiring harness.
  3. Connect the temperature sensor to the wiring harness.
  4. Plug the controller into a wall outlet and ensure that the LED on the side of the controller flashes green 3 times. (This will be followed by 30 seconds of the green LED blinking on and
    off every second while the controller is in provisioning mode.)
  5. Blow through the flow meter in the direction of the arrow and ensure the controller makes a slight audible click and the red LED turns on for approximately 5 seconds.


If this test fails, disconnect all connections and inspect the wires to ensure they are not broken or loose and that the pins in the RJ-14 connector are not bent. Reconnect all connections ensuring they snap together and re-test.

NOTE: If the controller light blinks fast red, the issue is with a temperature sensor connection at the Y connector. See Troubleshooting Symptom 1.

Quickstart Install

  1. Install the flow meter at the cold water input to the water heater ensuring the arrow on the flow meter points in the direction of flow. NOTE: PTFE tape is necessary when connecting to a female NPT connector. PTFE tape is NOT necessary when connecting to a flexible hook up line as they have a washer that creates the seal.
  2. Attach the temperature sensor to smooth copper piping near the hot water outlet from the water heater with electrical tape ensuring the entire length of the sensor is in contact with the pipe. Do not attach it to a coupler, corrugated flex pipe or a hookup hose. Cover the temperature sensor with insulation.
  3. Plug the controller into an outlet and plug the pump into the controller.
  4. Turn a hot water faucet fully on for 1 second and the pump will turn on for at least the initial run time of 5 seconds. If the hot water line is cold the pump will continue to run until hot water reaches the thermostatic cross over valve causing it to close and the flow to be cut off. When this happens the controller will turn the pump off.


If the pump fails to turn on or fails to stay on past the initial 5 seconds or continues to run after you have hot water at the faucet(s) where the crossover valve(s) is (are) installed, see Troubleshooting.

LED Legend

GREEN LED: will blink 3 times when first plugged in to indicate the unit is functioning correctly
GREEN LED: will blink once every second for 30 seconds after first being powered on to indicate the device is in provisioning mode.
GREEN LED: solid on when a timer is active and pump is not running
GREEN LED: will blink every 10 seconds when no other LED is lit (e.g. no timer active, pump not running)
RED LED: fast blinking indicates that the temperature sensor is not connected properly
RED LED: will blink every 5 seconds when Max Pump Run Time is exceeded.
RED LED: solid on when the pump is running whether due to a timer or due to demand
BLUE LED: solid on when connected via the smart phone app

DETAILED INSTRUCTIONS

Please read over the following detailed instructions. If you are not comfortable with any part of them please contact a licensed plumber to perform the installation.

Prior to installation you must perform the system test at the beginning of the Quickstart Guide.

Installation

  1. Note setting of water heater thermostat and then set to lowest temperature setting (do not turn off the pilot light).
  2. Shut off the cold water supply to the water heater.
  3. Open the closest hot water faucet to the water heater to depressurize the hot water line. When water quits flowing, turn off the faucet.
  4. Disconnect the cold water supply line from water heater. Be careful not to bend and crease the supply line when manipulating it. Be prepared with some towels as some water will flow out of the hookup line. You don’t have to drain the tank. As long as all the faucets remain closed you should not get any back flow from the hot water line.
  5. Connect the flow meter to the cold water input of water heater using PTFE tape being sure that the arrow on the flow meter is pointing toward the water heater.
    Smart Recirculation Control Flow Meter installation Leridian Dynamics
  6. Connect the cold water supply line to the input side of the flow meter. The supply line uses a washer to seal instead of PTFE tape so you don’t need use PTFE tape on this connection. The washer will seal the line to the flow meter. Hand tighten and turn an additional ¼ to ½ turn. DO NOT OVER TIGHTEN!
  7. Turn on the cold water supply to the water heater and inspect for leaks.
  8. Turn water heater thermostat back to its original temperature setting.
  9. Attach the temperature sensor to smooth copper piping near the hot water outlet from the water heater with electrical tape ensuring the entire length of the sensor is in contact with the pipe.

    Do not attach it to a coupler, corrugated flex pipe or a hookup hose.Cover the temperature sensor with insulation.

    NOTE: If installing with PEX

    PEX is a good insulator and will cause a lag in the controller sensing the temperature change. You will need to plumb in a short section of copper pipe and attach the temperature sensors to the copper pipe instead of attaching the sensors directly onto the PEX.

    Temperature Sensor Installation Instructions for hot water recirculation pump control with using Smart Recirculation Control from Leridian Dynamics Temperature Sensor Installation Instructions for hot water recirculation pump control with using Smart Recirculation Control from Leridian Dynamics

  10. Connect the temperature sensor to the wiring harness using the RJ-14 connector ensuring it snaps together securely.

connect the temperature sensor to the wiring harness using RJ-14 connector

  1. Connect the flow meter to the wiring harness via the JST connector ensuring it snaps together securely.
    wiring harness Installation for Smart Recirculation Control
  2. Secure the wires to the wall away from the water heater.
  3. Plug the wiring harness into the Smart Thermostatic Control 32 via the RJ-45 connector ensuring it snaps in securely.

Plug the wiring harness into the Smart Thermostatic Control 32 via the RJ-45

  1. Plug the recirculation pump into the Smart Thermostatic Control32 and plug the Smart Thermostatic Control 32 into an electrical outlet.

    Smart Thermostatic Control 32 by Leridian Dynamics

  2. The green LED on the side of the controller will blink 3 times if everything is OK. If the red LED flashes see Troubleshooting Symptom 1.
  3. Turn a hot water faucet fully on for 1 second. This will trigger the recirculation pump to turn on and run until the thermostatic crossover valve is up to temperature. The red LED turns on while the pump is running.
  4. Once the thermostatic crossover valve heats up and closes, the flow will stop and the pump will turn off.
  5. If the pump fails to turn on when a faucet is fully opened for 1 second, see Troubleshooting Symptom 2.
  6. If the pump fails to stay on past the initial 5 seconds, see Troubleshooting Symptom 3.
  7. If the pump continues to run after you have hot water at the faucet(s) where the crossover valve(s) is (are) installed, see Troubleshooting Symptom 4.
  8. If the pump runs for 1 minute and then shuts off before there is hot water throughout the house, see Troubleshooting Symptom 5.

Smart Thermostatic Control 32 Tank Setup With Smart Phone

Troubleshooting

If you need further support, please contact:

Leridian Dynamics, Inc. Customer Support or 831-761-8659