NTI Trinity TX Series Installation And Operation Manual page 48

DHW Piping (Combi)
DHW to Fixtures
Cold Water Supply
Isolation Valve
DHW Plumbing (Tx-Combi)
DHW Inlet & Outlet Connections – The Tx-Combi has two potable water connections, Inlet & Outlet, which
exit the bottom of the unit, nearest the back. The Inlet fitting is on the right and the Outlet fitting is on the
left, see Figure 11-1.
DHW Filter – Install the factory supplied Y-strainer prior to the inlet fitting, as illustrated in Figure 11-1. The
serviceable Y-strainer has a 100 micron filter and will protect the internals from damage caused by dirt and
debris.
Check Valve – The installation of a check valve in the hot water line is recommend to prevent expansion devises
downstream from back flowing when the water pressure drops during cold water draws. Failure to prevent
the backflow will cause a momentary forward flow of water through the flow sensor when the cold-water
draw has ended and the water pressure increases. This forward flow of water will momentarily activate DHW
mode.
Throttling Valve – Use one of the isolation valves, installed hot water line, as a throttle valve to regulate the
maximum hot water flow rate. The Tx-Combi has a limited firing rate (e.g.: only 151 MBH for model
Tx151C); therefore excessive flow rates will result in cooler hot water temperatures.
Drain and Isolation Valves – Install drain and isolation valves on the cold water inlet and hot water outlet lines,
as shown in Figure 11-1, to allow for servicing of the internal brazed plate heat exchanger and other potable
water components. It will be necessary to flush or clean the brazed plate heat exchanger, if it is exposed to
hard water.
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Figure 11-1 Near Boiler DHW Piping (Combi models)
Tempering Valve
(Manditory)
Y-Strainer
(factory supplied)
Tx I&O Manual
DHW Outlet (Hot)
DHW Inlet (Cold)
Drain Valve