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Matrix Installation and Operation Instructions
6.1 Plumbing (Minimum Requirements)
Pressure Regulator “Fill Valve” (Supplied):
The Matrix operates as a boiler to provide heat, thus it must be installed and
operated as such. A 12-15 PSI pressure regulator is provided with the Matrix and must be field installed as per the installation
instructions. Note: Local authorities may require the installation of a certified “back-flow preventer” immediately before the
pressure regulator.
Circulating Pump (Supplied):
The Matrix has a built-in circulator to pump water from the boiler to either the internal forced-
air heating coil or the internal domestic coil (brazed plate heat exchanger). An external circulator is only required if the Matrix is
also being used to supply heat to a hydronic
heating system, the external circulator must be sized for the requirements of the
hydronic heating system.
Relief Valve (Supplied):
A 30PSI Relief Valve is provided with the system, it is to be mounted with the discharge in the
horizontal. Ensure that the discharge is piped to a location were steam or water won’t cause personal injury or appliance and
property damage.
Air Purging (Supplied):
Boilers are designed to operate with airless water in the system. The Matrix design allows for the
evacuation of air from the internal plumbing. For installations in conjunction with a hydronic heating system an Air Scoop,
installed as shown in the following diagrams, must be installed to remove air as it circulates through the system. If air continues to
be a problem an air scrubber must be used (recommend Spirovent # VJR 100TM).
Expansion Tank (Supplied):
The Matrix comes with a built-in expansion tank that is sized to handle the volume of water in the
Matrix unit. An external expansion tank must be field sized, supplied and installed for Matrix units installed in systems with
hydronic heat.
Low Water Cutoff:
A certified LWCO is not provided in the package, however one is to be field installed in any application
where the Matrix boiler is located above the radiation or where local authorities require it. Ensure that the water line of the “Low
Water Cutoff” is at least 6” above the top of the boiler.
It is recommended that the LWCO be situated so that it can be tested without removing water from the Matrix. Tri-cocks and a
gauge glass are highly recommended.
NTI recommends against the installation of isolation valves between the LWCO and the Matrix.
Use the normally open contacts of the LWCO to break 24V to the burner circuit (See Wiring Diagram).
CAUTION
DAMAGE WILL OCCUR IF THE BOILER IS FIRED WITH NO WATER IN IT, OR REPETITIVE NO
FLOW OPERATIONS, WHICH WILL VOID THE WARRANTY.
