Watts tekmar 294 - Dedicated DHW Operation; Dedicated DHW System Overview; Dedicated DHW Call and Boiler Operation

IOM-T-294 2205 © 2022 tekmar
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Dedicated Domestic Hot Water Operation
The control can operate water heaters to provide heat in an
open-loop dedicated domestic hot water system. This is
selected by setting DHW Type to Dedicated. When dedicated
is selected, all other heating calls are disabled.
DHW Call
A DHW sensor installed in a temperature well to measure
the tank temperature is used to create a DHW call. When
the DHW sensor fall below the DHW Tank Occupied setpoint
minus the Proportional Interstage Differential, a DHW call is
displayed on the System Inputs screen.
Boiler Operation
The dedicated domestic hot water uses proportional staging
for operating the water heaters. As the DHW tank temperature
progressively drops, additional water heaters are staged on.
Please refer to the System Operation for further information.
Programmable Schedule
When the programmable schedule is On, the DHW Tank
Unoccupied is the setpoint during unoccupied time periods.