NTI Trinity TX151(C) - Tx-Combi W; DHW Storage Tank

Tx I&O Manual │DHW Piping (Combi)
51
Tx-Combi w/ DHW Storage Tank
To completely avoid the DHW limitations inherent with on demand hot water heating, install a DHW storage tank
as per Figure 11-2. When the tank temperature is insufficient, a Thermostat located within the storage tank
completes a 120VAC circuit to operate a Potable (bronze or Stainless Steel) Circulator pump. The pump
circulates water from the bottom of the storage tank (typical location of a drain fitting) to the DHW inlet fitting of
the Tx-Combi. The internal DHW flow sensor senses the water flow and triggers a DHW demand; heated water
flows from the Tx-Combi and enters the Recirculation Inlet fitting of the storage tank.
Figure 11-2 DHW Piping with Optional Storage Tank (Tx151C & Tx200C)
When using a Storage Tank, set Preheat Mode (Installer Menu setting 2-10) to OFF to
prevent the boiler from redundantly maintaining DHW temperature.
Y-Strainer (factory
supplied)
Drain Valve
Outlet
Inlet
Isolation Valve
Potable Circulator
(w/ check valve)
Cold Inlet / Drain
Recirculation Inlet
Thermostatic
Mixing Valve
Hot Outlet
Cold Water Supply
DHW to Fixtures