14
3.0
DHW Settings
3.13 Antilegionella Function
Default: Enabled
The Antilegionella Function ensures that an Indirect Water Heater is heat-
ed at least once per week to prevent the growth of Legionella bacteria.
Press the
UP
or
DOWN
buttons to select Enabled or Disabled then press
the
OK
button to store the setting.
•
Enabled
- When the Thermostat option is chosen in DHW Demand,
a domestic hot water call is generated for 15 minutes once per week
to heat the Indirect Water Heater. When the Sensor option is cho-
sen in DHW Demand, a domestic hot water call is generated until
the DHW storage temperature reaches 140°F [60°C] once per
week. When the Sensor option is chosen in DHW Demand, the
weekly timer is reset whenever the DHW storage temperature
reaches 140°F [60°C] to prevent unnecessary firings. This function
will be active even if DHW Operation has been set to Disabled.
•
Disabled
- The Prestige will only fire in DHW mode when a
domestic hot water call is received.
The Antilegionella Function should only be left enabled when
an Indirect Water Heater is installed. Enabling the
Antilegionella Function without an Indirect Water Heater will
result in the Prestige firing once per week in DHW mode. This
could cause a Manual Reset Hard Lockout resulting in sub-
stantial property damage.
The Antilegionella Function is most effective when the Sensor
option is chosen in DHW Demand. The use of an Indirect
Water Heater Sensor ensures that the domestic hot water is
heated to 140°F [60°C] at least once per week.
WARNING
BEST PRACTICE
Antilegionella Function
Enabled
Disabled
2015-10 Prestige ACVMax Control Sup 12-14-15_ACVMax_Control 12/15/15 7:36 AM Page 14