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.
(1) Smart Recirculation Control 32 with RJ-45 connector
(2) Temperature Sensors with RJ-14 connectors and RJ-14 Splitter
(1) 3/4” or 1” NPT Flow Sensor with JST connector
(1) Wiring Harness with RJ-45, RJ-14, and JST connectors
Items Note 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
Before you begin installation, perform the following system test.
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 Y connector are not pushed to one side or the other.
NOTE: If the controller light blinks fast red, the issue is with a temperature sensor connection at the Y connector. Sometimes it helps to wiggle the RJ-14 connector as you insert them to ensure the pins drop into the slot in the connector and make solid contact. Reconnect all connections and re-test.
Do not attach it to the hook-up hose or a coupler. Cover the temperature sensor with insulation. The temperature sensor lines can be extended with RJ-14 telephone line extensions if needed. (what doe “tested mean exactly?) Tested extensions can be purchased from the online store.
If the pump fails to turn on or fails to stay on past the initial 10 seconds or continues to run for longer than 5 minutes and the piping feels hot, see Trouble Shooting.
GREEN LED: will blink 3 times when first plugged in to indicate the unit is functioning correctly.
GREEN LED: solid on when a timer is active and the 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 one or both of the temperature sensors are not connected properly.
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 smartphone app.
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.
Before installation, you must perform the system test at the beginning of the QuickStart Guide.
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.
Smart Recirculation Control 32
The Smart Recirculation Control 32 can be used simply as an on-demand controller for your recirculation pump, or it can be configured to run on a timer via an iPhone or Android smart device so that it will keep the recirculation loop hot between specific times of day and on specific days of the week (up to 10 timers can be set). You can choose to use both on-demand and timers to customize the system to work best for you.
Even when a timer is active, the app only runs the pump until the recirculation loop is heated. Then, it shuts the pump off while continuing to monitor the recirculation loop temperature.
The app uses Bluetooth to communicate with the controller, so you must ensure Bluetooth is enabled on your smart device. The approximate range for Bluetooth reception is 30 feet from the control unit.
Do not “pair” the Bluetooth device; running the app will find and connect to the Smart Recirculation Control 32 and display the “Live Data.”
The blue LED on the controller will illuminate when the app is connected.
(Initial screen displayed):
The live data screen displays the high and low temperature sensor values, the calculated difference, the flow meter value, and whether the pump is running or there is a timer active.
There is also a “Trigger Pump” button to activate the controller from the smartphone app.
This screen is helpful for troubleshooting and configuration of the controller.
For example, if the controller isn’t turning on when hot water is drawn from a faucet, the live data screen will show you the flow value the controller is detecting.
If the flow value is less than the Sensitivity setting, the controller will not turn on.
If the flow is greater than the Sensitivity setting and the controller doesn’t turn on, then the temperature difference is not greater than the large difference value in the Temperature Range setting.
This screen provides for controlling all the settings of the firmware. There is a list of basic settings and the ability to expand the settings to show “Advanced Settings.”
Sensitivity – The sensitivity setting allows the user to set how many flow meter pulses are required to turn on the controller. The default value is 20, which is fine for most installations.
If you find that the controller is not turning on when you turn a faucet on and off, you will need to decrease this value to make the controller more sensitive to flow (require fewer pulses to turn the controller on).
If you find that the controller is turning on when there is no timer active and no hot water being drawn, you will need to increase this number to make the unit less sensitive to fluctuations in flow (require more pulses to turn the controller on).
Temperature Range – The setting allows the user to set the temperature differences that cause the controller to turn the pump on and off.
When the controller senses flow, it checks to see if the temperature difference between the two temperature sensors is greater than the large difference and if it is, it turns on the pump.
It runs the pump until the temperature difference is less than or equal to the small difference.
The default large difference is 8F°, and the default small difference is 5F°. These values work fine for most installations; however, if you find that the controller is turning on and never turning off, you should increase the value of the small difference.
It is recommended to keep at least a 3F° difference between the high and low temperature difference values.
Timers Enabled – This switch enables and disables the timers.
This can be used to turn the timers off when you go away on vacation or to simply turn them off if you just want to use the on-demand feature of the controller.
The Smart Recirculation Control 32 implements “Smart Timers,” which, regardless of this setting, will automatically disable if no hot water usage is detected within 24 hours.
The timers are re-enabled as soon as hot water flow is detected, or the controller is connected to via the app.
Dormant Interval – The dormant interval is the number of minutes that the controller lies dormant after sensing flow and heating up the loop.
As long as there is hot water flow within the dormant interval, the dormant interval timer is reset.
The dormant interval is also the number of minutes that the controller waits when a timer is active between pump runs. If you want the pump to turn on more quickly while a timer is active or more quickly between pump runs when you draw hot water, you will need to reduce this value.
The default value is 10 minutes which is fine for most installations.
Flow Meter Delay – The flow meter delay is the amount of time in hundredths of a second, during which the controller counts the number of pulses that occur in the flow meter.
If the number of pulses counted is above the sensitivity threshold, then the controller deems that there is flow in the hot water line.
The default value is 75 hundredths of a second, which is fine for most installations.
Initial Pump Run Time – The initial pump run time is the number of seconds the pump runs when it first senses flow if the Dormant Interval has expired.
This is to ensure that hot water from the water heater makes it to the first temperature sensor in order to obtain an accurate temperature comparison between the two temperature sensors.
When a timer is active, the pump will turn on every Dormant Interval for the length of the Initial Pump Run Time in order to check the temperature of the recirculation loop. The default value is 10 seconds which is fine for most installations.
If the temperature sensor for the hot water outlet is installed some distance from the water heater, this value may have to be increased.
Bluetooth Advertising Power – This is the power at which the Bluetooth radio advertises its presence. The app searches for this signal when connecting. The higher this value, the further away from the controller the app can find and connect to the controller. The default value is 5.
Bluetooth Transmission Power – This is the power at which the Bluetooth radio communicates with the app once its presence is detected. The higher this value, the further away from the controller the app can be taken once the app is connected. The default value is 5.
Reset to Factory – This will reset the Smart Recirculation Control 32 back to the factory defaults. If the controller isn’t operating as expected, resetting to the factory defaults is a good thing to try to resolve the issue. You must type “yes” when prompted in order for the factory reset to take place.
This screen displays the timers. They are black when the timers are enabled. If they are gray, then they are disabled. Tap the timer to edit or delete it. To add a new timer, tap the Add Timer button.
The real-time clock in the Smart Recirculation Control 32 is set when you connect to the controller with your smartphone. The Smart Recirculation Control 32 has a built-in power backup that will keep the clock’s time for approximately 48 hours without power. After which, the clock will lose its time, and the controller’s timers won’t function until the time is set by running the app and connecting to the Smart Recirculation Control 32.
The clock does not adjust for daylight savings time, so when the time changes, you will need to connect to the Smart Recirculation Control 32 with your smart device, and the time will be set to the time of your smart device.
Displays a rolling log of the last 227 controller activations.
The firmware of the Smart Recirculation Control 32 can be updated via the smartphone app. The app will notify you when you first connect if there is a new firmware available, and selecting OK will navigate you to the Firmware screen. By default, only the firmware of your type of controller will be displayed, and if there is an update available, it will be enabled. Tap on the firmware and tap the “Update Firmware” button, and the controller will begin the update process. Do not allow the application to go to the background or the phone to sleep while the firmware update is running. If the firmware is already installed, it will be gray and not able to be selected.
There is an option on this screen to “Show All Firmware Versions,” which will display the firmware from our entire product line. The sensor requirements are different for the different firmware versions, so updating to a different product without understanding the implications may provide unexpected results. Please see our web site for a description of the different products.
ISSUE: The Smart Recirculation Control 32 is not able to get temperature information from the temperature sensors.
RESOLUTION: Unplug the Smart Recirculation Control 32 from the wall and disconnect all three connections at the Y connector where the sensors connect to the wiring harness. Inspect the pins in the connector and ensure they are not pushed to one side or the other. If they are, you can straighten them with a small screwdriver or pen knife.
If they are not visibly bent then, it can help to wiggle the RJ-14 connectors as you insert them to ensure the pins drop into the slot in the connector and make solid contact.
Plug the wiring harness back into the Smart Recirculation Control 32. Plug the Smart Recirculation Control 32 back into the wall outlet.
ISSUE 2A: The temperature difference between the two temperature sensors is less than the large value in the “Temperature Range” setting (default 8F°), and therefore the controller will not turn on.
RESOLUTION 2A: If the temperature difference has been met then there is no reason to run the pump. This is normal behavior as the controller should only run the pump when there is demand, and the loop is not up to temperature.
To cause the controller to turn on, you will need to wait for the temperature at the end of the loop to drop and create a temperature difference of 8F° or decrease the large difference value in the “Temperature Range” setting.
ISSUE 2B: The flow being seen at the controller is too low to activate the pump.
RESOLUTION 2B: Go into “Live Data,” open the faucet in question, and observe the flow value. If the value is not greater than the “Sensitivity” setting, the controller will not turn on. Adjust the “Sensitivity” value to be less than the observed value in “Live Data.”
NOTE: If you are seeing very low flow at the faucet it is possible the aerator in the faucet is clogged. Removing it and tapping it to remove any accumulated sediment can restore the flow, but they are inexpensive so replacing it is recommended.
ISSUE: The controller isn’t sensing a temperature difference greater than the large difference that is set in the Temperature Range setting (default 8F°).
RESOLUTION 3A: Ensure that the temperature sensor is securely connected to the copper piping coming out of the water heater as close to the water heater as reasonable. Typically, this will be after the hookup line. If it is loose, re-secure it in place with electrical tape, cover it with insulation, and test it again. If it still won’t stay on, see RESOLUTION 3B.
RESOLUTION 3B: This is typically a situation where it is taking longer than 10 seconds for the pump to get hot water out to the location of the first temperature sensor and cause the temperature difference to be greater than the large difference that is set in the Temperature Range setting (default 8F°).
To test this, after the pump has run for the initial 10 seconds, turn the hot water on again for 5 or so seconds. If the pump kicks on and starts running, then you need to increase the Initial Pump Run Time under Advanced Settings. The default is 10 seconds.
We recommend increasing this by 5 seconds at a time and testing again when the system is cold.
You can also view the “Live Data” in the app, which displays live temperature values and differences to see what is actually being sensed.
ISSUE: The controller isn’t sensing the temperature difference dropping below the small difference that is set in the Temperature Range setting (default 5F°).
RESOLUTION 4A: Ensure that the temperature sensor at the end of the recirculation loop is securely connected to smooth copper piping and that it is connected before it T’s into the cold water feed into the water heater.
If it is loose, re-secure it in place with electrical tape, cover it with insulation, and test it again.
If it still won’t stay on, see RESOLUTION 2.
RESOLUTION 4B: Open the smartphone app to view the temperature value and temperature difference displayed in “Live Data.”
If the difference is greater than the small temperature difference in the “Temperature Range” setting (default 5F°), then the pump won’t turn off.
Go into the “Temperature Range” setting and increase the small temperature difference value to be greater than the value observed in “Live Data,” and the pump will turn off.
This typically happens in homes where the hot water line isn’t well insulated, and the water loses temperature as it recirculates throughout the home. Do your best to insulate all hot water pipes that you can reasonably access. It will make the system perform better, and it will save you money on energy bills.
NOTE: We recommend that you set the large temperature difference value to be at least 3F° higher than the small temperature difference value.
ISSUE: Pressure spikes in the cold-water supply line caused by abrupt turning on or off of the cold water (for instance, when a toilet fills or a sprinkler system turns on or by fluctuations in the feed from the utility company) can cause the Smart Recirculation Control 32 to trigger the hot water recirculation pump to turn on.
RESOLUTION: The sensitivity value of the Smart Recirculation Control 32 is too low and should be adjusted higher. The default value of 20 works well but can be susceptible to these false triggers. It is recommended to increase it by 5 pulses at a time to filter out these anomalies.
ISSUE 6A: A wire connecting the flow meter is broken.
RESOLUTION: Inspect the wiring harness where it connects to the flow meter to ensure none of the three wires appear broken. If they are, contact Leridian Dynamics to get a replacement harness. If it looks good, see ISSUE 6B.
ISSUE 6B: Sediment or scale is blocking the flow meter.
RESOLUTION: To confirm this is the issue, perform the following test.
Remove the sensor from the flow meter that is held in place with 2 small silver screws (don’t worry, it won’t leak water when the sensor is removed).
Start the smartphone app, view the “Live Data” screen, and quickly wave a magnet back and forth over the sensor. You should see the flow value change. The flow meter works by spinning a magnet on a turbine that is read by the sensor.
If you see a flow value in the smartphone app, the flow meter is blocked with sediment or scale and needs to be removed and cleaned. If you do not see a flow value, then there is an issue with the sensor and/or the wiring harness, and it will have to be replaced.
If you need further support, please contact:
Leridian Dynamics, Inc. firstname.lastname@example.org or 831-761-8659