NTI TRX Series Installation, Start-up, Maintenance, Parts, Warranty

Also see for TRX Series: Manual Quick start guide

Contents

NTI TRX Series Installation, Start-up, Maintenance, Parts, Warranty Manual pdf 26 page image

26Part 4 - Water PipingF. By-Pass ValveTRX085 - TRX120TRX110C - TRX150CThis boiler has a by-pass valve which requires no adjustment.The by-pass valve protects the heat exchanger from overheating byguaranteeing a minimum flow rate of 2 gpm within the primary heatexchanger. This protects the primary heat exchanger from overheatingwhen water circulation is insufficient or heating system load is reduced(ex: due to the response of thermostatic valves or zone valves).The by-pass valve is located:- in the left hydraulic block for TRX085 and TRX120.- in the right hydraulic block , behind the three-way valve, forTRX110C and TRX150C.By-Pass ValveLocationBy-pass valvelocationE. Internal Circulation PumpTo calculate the size of the heating installation refer to the graph below.Table 10 - Internal Circulation Head Curve048121620240 1 2 3 4 5 6 7gal/minfeetGraph Representing the Available Circulation Pump HeadFigure 15 - Internal Circulation Pump NOTE: Ensure the Air Vent on theInternal Circulation Pump Remains Open after InstallationFigure 16 - By-Pass Valve LocationFigure 17 - By-Pass Valve Assembly