TWH 70MBH Tankless Water Heater Mixing Panel with Zoning

The TWH Tankless Water Heater Mixing Panel’s primary application is as a multizone mixing device for tankless DHW heaters.

A DHW priority option for these panels is not available.

Sequence of operation:

• When a thermostat calls for heat, its internal 24V contacts close, the auxiliary terminals close, both pumps turn on, and its corresponding zone actuator opens.
• As the pump moves fluid through the panel the thermostatic mixing valve adjusts the fluid temperature based on the user settings.
• When the requirements of the thermostat are met, the internal contacts of the thermostat open, and the corresponding zone actuator closes. If no other thermostats are calling for heat, the auxiliary contacts open, and the pumps stop.
• Both the primary and secondary pumps are activated, and all zone actuators open, once every 24 hours, for 15 minutes, to ensure that potable water in the piping is not stagnant.

California Proposition 65 WARNING