Frequently Asked Questions

Yes, the user can toggle the control panel arrows to the GPM indicator and will indicate the flow in gallons per minute (GPM) Adjust the zone valve accordingly to the designed flow rate for that circuit. This is a very useful feature for the installer. Also, if 240 VAC is supplied to the control panel, the installer can power up the control board and use this feature to adjust proper flow rates at time of installation.
Yes, the primary or internal circulating pump will need to be powered with a separate 120 VAC 15amp circuit breaker. The connection point for this circuit is located on the pump board located on the top left portion inside the boiler.
No, the boiler is equipped to handle the secondary pump from the Pump 2 connections located on the pump board. Although the installer still needs to wire to the secondary pump from these Pump 2 connections. Note that the circuit is protected by a 2 amp fuse and may have limitations on larger circulators with higher amp ratings.
The OP connection can be integrated with an electric utility OFF PEAK or Time of Use (TOU) program. This enables the utility to remove the boiler's kW load off of their peak or enable the operation of the heating systems during specific times of the day. In turn the customer receives discounted electricity. The OP circuit could also be utilized to shut the boiler off using any dry contact integrated in other applications.
Please refer to the installation manual or specification literature for proper sizing. The electrical contractor is responsible for ensuring that all circuits are properly sized to meet the National Electric Code.
The boiler will not start when the pressure in the system is not high enough. For example: There are 6 radiant circuits and 5 of them have thermostatic valves switched off, a large resistance in the system will occur that may prevent the activation of the boiler. In this situation, the bypass valve will provide sufficient flow through the boiler and correct operation of the system. The valve is pre-set in order to work with minimal resistance. By adjusting the valve, you can lift the pressure barrier but we recommend that it is left at the factory settings.
The sensor is designed to measure the pressure in the system. Placing it directly in front of the heating unit would provide false reading because of the internal components of the boiler that also have an impact on the size of the pressure (pump, elbows on tubes and so on...). The sensor is there to switch off the boiler when the system pressure falls below 0.7psi.
The pressure drop across the boiler is configured with the pump curve to give the designer/installer the available or disposable pressure drop. Please refer to this curve to configure radiant design using the primary or secondary pump.
A pressure/temp (P/T) gauge can certainly be installed in the piping. Manufacturers often includeP/T gauges with their manifolds as well. The NextGen Boiler is unique in that it has a pressure sensor integrated in the boiler. The pressure reading in PSI can be viewed on the control panel. This will eliminate the need to purchase and install a pressure temp gauge thus saving on labor. Note that in order to read the pressure in the system, the boiler will first need to be powered with 240 VAC power.