AERCO Esteem Boiler with EZ-Set Controller - Manual (Page 142)

GF-135 Esteem 399 Low NOx Boiler
Chapter 18
OMM-0089_0A Installation, Operation & Maintenance Manual Controller Operation
18.4.12 Antilegionella Function (Default: DISABLED)
Figure 18-38: ANTILEGIONELLA FUNCTION Menu
The Antilegionella Function ensures that an Indirect Water Heater is heated 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 Switch 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 chosen 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 boiler will only fire in DHW mode when a domestic hot water call is received.
WARNING!
The Antilegionella function should only be enabled when an indirect
water heater is installed. Enabling the Antilegionella function
without an indirect water heater will result in the boiler firing once
per week in DHW mode, which could cause a manual reset hard
lockout resulting in substantial property damage.
NOTE
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.
Page 142 of 188 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0089_0A
MC1 06/19/14 Ph.: 800-526-0288