LAARS NeoTherm LC NTV1700 - Install and Operating Manual - Manual (Page 70)

LAARS Heating Systems Page 66
20 mA water temperature -
If a 4 – 20 mA input is used to adjust the
setpoint, this entry sets the high limit of the
control range. (In the example shown here,
an input of 20 mA would result in a setpoint
of 120°F.)
7. Press the left-arrow or right-arrow until you
see the Domestic Hot Water screen (Fig. 85).
Fig. 85 – Domestic Hot Water
The arrangement for Domestic Hot Water can
be set up in several ways. For details, see the
section on “Lead/Lag Domestic Hot Water.”
DHW Setpoint -
This is the same as the DHW Setpoint on
the Lead/Lag Master Configuration screen.
DHW Time of day setpoint -
This is the same as the DHW Time-Of-
Day Setpoint on the Lead/Lag Master
Configuration screen. (See the material on
“About the ‘Time of Day’ Function at the
end of this section.)
DHW Priority method -
This determines the way the system gives
priority to the DHW demand (if DHW is
given priority on the bottom line of the
screen.)
DHW priority override time -
If Domestic Hot Water has priority (see
the next line below), this sets how long
the DHW loop will have priority before
returning to control by the Lead/Lag Central
Heat setpoint.
DHW has priority over CH? -
Choose Central Heating priority or
Domestic Hot Water priority.
8. Press the left-arrow or right-arrow until you
see the Outdoor Reset screen (Fig. 86).
Fig. 86 – Outdoor Reset
“Outdoor Reset” allows the system to adjust
the Central Heat setpoint to compensate
for changes in the outdoor temperature.
This allows the whole system to run more
efficiently. For details, see the section on
“About Outdoor Reset.”
Enable -
Enable = Outdoor Reset feature turned on
Max. outdoor temp. -
If the outdoor temperature reaches this value
or above, the system will use the Low Water
Temp value as the setpoint. In the example
shown in Fig. 86, the Max. Outdoor Temp.
is set to 70°F. If the outdoor temperature is
70°F or above, the system will use 100°F
(the Low Water Temp.) as the setpoint.
Min. outdoor temp. -
If the outdoor temperature reaches this value
or below, the system will not compensate
for the outdoor temperature. In the example
shown in Fig. 86, the Min. Outdoor Temp.
is set to 32°F. If the outdoor temperature
reaches 32°F or below, the system will
use the normal Lead/Lag System setpoint
(120°F in this example).