18
dHW Settings
dHW To cH call Blocking
default: 1 Minute
DHW To CH Call Blocking sets the minimum time between a DHW
burner firing and a CH burner firing. At the completion of a DHW burn-
er firing, the DHW to CH Call Blocking time will begin. The burner will
not fire again for a central heating call until after the DHW To CH Call
Blocking time has elapsed. The DHW To CH Call Blocking time only
prevents the burner from firing, the central heating circulators will
respond to a central heating call. This blocking time has no affect on
domestic hot water calls. The DHW To CH Call Blocking feature pre-
vents the burner from firing when switching from a domestic hot water
call to a central heating call. This allows the remaining heat in the heat
exchanger to be dissipated and potentially satisfy the central heating call.
Press the
LEfT or RIGHT
buttons to adjust the DHW To CH Call
Blocking time then press the
oK
button to store the setting.
antilegionella function
default: disabled
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 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 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 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 substantial proper-
ty 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
0 min.
30 min.
1 min.
DHW to CH
Call Blocking
Antilegionella Function
Enabled
Disabled
Disabled
