NTI VM110 Installation And Operation Instructions Manual

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NTI VM110 Installation And Operation Instructions Manual Manual pdf 46 page image

Field Wiring │ Vmax I&O Manual4611.0 DOMESTIC HOT WATER (DHW) PIPINGDHW Description of OperationThe VM110P (Vmax Plus) incorporates a Stainless Steel 16 gallon DHW storage tank with an internal StainlessSteel heat exchanger coil (i.e. an Indirect Fired Hot Water Heater). This allows the Vmax Plus to heat DHWwithout the need for a separate water heater. A temperature sensor continuously monitors the temperature of thepotable water in the tank, thereby ensuring that a constant supply of hot water is available. The tank temperaturecan be adjusted via Installer Menu setting 2-07 (“DHW Setpoint”). Set “DHW Setpoint” to the desired hot watertemperature; to avoid the risk of scalding a Thermostatic Mixing Valve must be installed, see Figure 11-1.VM110P DHW Plumbing & Set-upDHW Connections – The VM110P has three potable water connections, Inlet/Drain, Outlet and Recirculation;see Figure 11-1. If a recirculation line is not being used, be sure to cap the Recirculaiton connection on thebottom of the Vmax Plus.Throttling Valve – Use one of the isolation valves, installed hot water line, as a throttle valve to regulate themaximum hot water flow rate. The VM110P has a limited firing rate (110 MBH); therefore excessive flowrates will quickly deplete the hot water stored in the tank – recommend not to exceed 4 GPM.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 storage tank and other potable water components. It maybe necessary to flush or clean the inside of the storage tank.Figure 11-1 Near Boiler DHW Piping (VM110P)DHW Outlet (Hot)Cold Water SupplyDHW to FixturesTempering Valve(Check local codes)Recirculation Optional(cap if not in use)Isolation ValveDrain ValveDHW Inlet (Cold)Condensate Drain(install factorysupplied trap)