Field Wiring │ Vmax I&O Manual
11.0 DOMESTIC HOT WATER (DHW) PIPING
DHW Description of Operation
The VM110P (Vmax Plus) incorporates a Stainless Steel 16 gallon DHW storage tank with an internal Stainless
Steel heat exchanger coil (i.e. an Indirect Fired Hot Water Heater). This allows the Vmax Plus to heat DHW
without the need for a separate water heater. A temperature sensor continuously monitors the temperature of the
potable water in the tank, thereby ensuring that a constant supply of hot water is available. The tank temperature
can be adjusted via Installer Menu setting 2-07 (“DHW Setpoint”). Set “DHW Setpoint” to the desired hot water
temperature; to avoid the risk of scalding a Thermostatic Mixing Valve must be installed, see Figure 11-1.
VM110P DHW Plumbing & Set-up
DHW 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 the
bottom of the Vmax Plus.
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 VM110P has a limited firing rate (110 MBH); therefore excessive flow
rates 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 may
be necessary to flush or clean the inside of the storage tank.
Figure 11-1 Near Boiler DHW Piping (VM110P)
Tempering Valve
(Check local codes)
Recirculation Optional
(cap if not in use)
Condensate Drain
(install factory
supplied trap)
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