TFTN 085-199 Installation and Operation Manual
Table 16-8 DHW Setup – Advanced Settings
Sets how much the DHW storage tank temperature can drop
below target before initiating a DHW demand. Only applicable
when using a Tank Sensor. (Range = 0-36°F)
Boiler outlet water temperature target during DHW demands.
(Range = 68-190°F)
System water temperature target during DHW demands serviced
by a cascade system. Only applicable for Manager boiler, and
with DHW configured as Downstream IWH. (Range = 68-190°F)
Alternating – DHW and CH will not operate simultaneously.
Priority switches between DHW and CH at an interval defined by
the CH/DHW Shifting Priority Time (first priority is DHW); if set to
0, then DHW has priority indefinitely.
None-Alternating – DHW and CH operate simultaneously for the
period defined by the CH/DHW Shifting Priority Time. After the
time elapses, operation returns to Alternating until the end of
the DHW request.
None – DHW and CH can operate simultaneously indefinitely.
Only applicable for DHW Mode configured as Downstream IWH;
Upstream IWH configuration always functions as Alternating
DHW/CH Charging
Priority Time
Determines how long a CH or DHW demand can last before the
priority is switched. A value of 0 keeps the priority with DHW
indefinitely. (Range = 0-720min)
System Pump
Activation Logic
Always Active – SYSTEM PUMP output (AUX1) turns on for both
CH and DHW demands (with DHW Mode set to Downstream).
CH Only – SYSTEM PUMP output (AUX1) only turns on for CH
demands.
Sets the length of time the DHW PUMP output operates after a
DHW demand is satisfied. (Range = 0-255sec)
This function prevents the formation of Legionnaires’ disease
bacteria which may develop in piping and IWHs at temperature
between 68°F and 104°F. When set to On, if the IWH
temperature stays below 138°F for over 100 hours, the boiler will
heat the water in the IWH until it reaches 149°F for 30 minutes.
Only applicable when a Tank Sensor is used.
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