© 2007
D 422 - 08/07
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Boiler Outdoor Reset
There is a water temperature and therefore a characterized
heating curve for each communication bus. When using
boiler temperature water to heat zones, the installer will
be required to set a boiler characterized heating curve.
This requires the tN4 DIP switch to be set to Boiler and
the Boiler Sensor DIP switch set to Supply.
Boiler Terminal Unit Defaults
When a terminal unit is selected for boiler zones, the
control loads default values for the boiler design, boiler
maximum supply, and boiler minimum supply temperatures.
The factory defaults can be changed to better match the
installed system. Locate the Boiler Terminal Unit setting
in the Adjust menu.
Mix 1 and Mix 2 Outdoor Reset
Each tN4 communication bus operates on a separate water
temperature. Therefore a separate characterized heating
curve is required for Mix 1 and, if the tN4 DIP switch is
selected to Mix 2, for mix 2 as well.
Mix 1 and 2 Terminal Unit Defaults
When a terminal unit is selected for Mix 1 (or Mix 2),
the control loads default values for the mix design, mix
maximum supply, and mix minimum supply temperatures.
The factory defaults can be changed to better match the
installed system.
•
•
Locate the Mix 1 and Mix 2 terminal unit settings in the
Adjust menu.
Mix Characterized Heating Curve
Terminal Unit
Mix
Design
Outdoor
Design
Mix
Indoor
Decreasing Outdoor Temperatures
Increasing Mix T
e
mper
ature
Terminal Unit
BOIL DSGN
BOIL MAX
BOIL MIN
High Mass Radiant (1)
120°F (49°C)
140°F (60°C)
OFF
Low Mass Radiant (2)
140°F (60°C)
160°F (71°C)
OFF
Fancoil (3)
190°F (88°C)
210°F (99°C)
140°F (60°C)
Fin-Tube Convector (4)
180°F (82°C)
200°F (93°C)
140°F (60°C)
Radiator (5)
160°F (71°C)
180°F (82°C)
140°F (60°C)
Baseboard (6)
150°F (76°C)
170°F (77°C)
140°F (60°C)
Boiler Indoor Design
The boiler indoor design temperature is the indoor temperature
the heating designer chose while calculating the heat loss for
the boiler water heated zones. This temperature is typically
70°F (21.0°C). This setting establishes the beginning of
the boiler characterized heating curve.
•
•
Locate the Boiler Indoor Design setting in the Adjust
menu.
Boiler Design Temperature
The boiler design supply temperature is the boiler water
temperature required to heat the zones on the typical
coldest day of the year.
•
•
Locate the Boiler Design setting in the Adjust menu.
Terminal Unit
MIX DSGN
MIX MAX
MIX MIN
High Mass Radiant (1)
120°F (49°C)
140°F (60°C)
OFF
Low Mass Radiant (2)
140°F (60°C)
160°F (71°C)
OFF
Fancoil (3)
190°F (88°C)
210°F (99°C)
100°F (38°C)
Fin-Tube Convector (4)
180°F (82°C)
200°F (93°C)
OFF
Radiator (5)
160°F (71°C)
180°F (82°C)
OFF
Baseboard (6)
150°F (76°C)
170°F (77°C)
OFF
Mix 1 and Mix 2 Indoor Design
The Mix 1 (or Mix 2) indoor design temperature is the indoor
temperature the heating designer picked while calculating
the heat loss for the building for the Mix 1 (or Mix 2) water
heated zones. This temperature is typically 70°F (21.0°C).
This setting establishes the beginning of the Mix 1 (or Mix 2)
characterized heating curve.
•
•
Locate the Mix 1 and Mix 2 Indoor Design settings in
the Adjust menu.
Mix 1 and Mix 2 Design Temperature
The Mix 1 (or Mix 2) design supply temperature is the mix
supply water temperature required to heat the zones when
the outdoor temperature is as cold as the outdoor design
temperature.
•
•
Locate the Mix 1 and Mix 2 Design settings in the Adjust
menu.
Boiler Characterized Heating Curve
Terminal Unit
Boiler
Design
Boiler
Indoor
Outdoor
Design
Decreasing Outdoor Temperatures
Increasing W
a
ter T
e
mperatures
