Cascade Instructions │ Vmax I&O Manual
11.0 DOMESTIC HOT WATER (DHW) PIPING
DHW Description of Operation
Vmax Plus models, VM110P & VM153P, incorporate a Stainless Steel 16 gallon DHW storage tank with an
internal Stainless Steel heat exchanger coil (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 & VM153P have 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 in the hot water line, as a throttle valve to regulate
the maximum hot water flow rate. The VM110P and VM153P have a limited firing rate (110 MBH and 154
MBH); therefore excessive flow rates will quickly deplete the hot water stored in the tank – recommend not to
exceed 3.8 USGPM for VM110P and 5.3 USGPM for VM153P.
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 & VM153P)
Tempering Valve
(Manditory)
Recirculation Optional
(cap if not in use)
Condensate
Drain
(install factory
supplied trap)
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