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Hydronic Radiant Floor (HRF2)
A light or low mass, hydronic radiant floor system. Most
commonly, this type of radiant heating system is attached to
the bottom of a wood sub floor, suspended in the joist space,
or sandwiched between the subfloor & the surface. This type
of radiant system has a relatively low thermal mass & responds
faster than a high mass system.
Fancoil (COIL)
A fancoil terminal unit or air handling unit (AHU) consisting of
a hydronic heating coil & either a fan or blower. Air is forced
across the coil at a constant velocity by the fan or blower & is
then delivered into the building space.
Fin–tube Convector (CONV)
A convector terminal unit is made up of a heating element
with fins on it. This type of terminal unit relies on the natural
convection of air across the heating element to deliver heated air
into the space. The amount of natural convection is dependant
on the supply water temperature to the heating element & the
room air temperature.
Radiator (RAD)
A radiator terminal unit has a large heated surface that is
exposed to the room. A radiator provides heat to the room
through radiant heat transfer & natural convection.
Baseboard (BASE)
A baseboard terminal unit is similar to a radiator, but has a low
profile & is installed at the base of the wall. The proportion of
heat transferred by radiation from a baseboard is greater than
that from a fin-tube convector.
BTC461503101C | 6720810369 (2018/03)
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, & boiler minimum supply temperatures. The factory
defaults can be changed to better match the installed system.
Locate the Terminal Unit setting in the Setup menu.
Terminal Unit
High Mass Radiant
Low Mass Radiant
Fancoil
Fin-Tube Convector
Radiator
Baseboard
Requirements : Boil MIN is only available if at least one boiler is
set to non-condensing. If all available boilers are set to condens-
ing, Boil MIN is not available & is hard-coded to OFF.
Room -- -- -- -- -- -- -- - - -- -- -- -- -- -- -- -- -- -- -- - --- -- -- --- --
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -
The Room setting is the desired room air temperature, according
to the outdoor reset heating curve. The Room setting parallel
shifts the heating curve up or down to change the target water
temperature. Adjust the Room setting to increase or decrease
the amount of heat available to the building. Once the heating
curve has been set up properly, the Room setting is the only
setting that needs to be adjusted. The default Room setting
is 70°F (21°C), & it can be adjusted for both the occupied &
unoccupied periods.
Outdoor Design - -- -- -- -- - -- -- -- - -- -- -- -- -- -- - -- -- -- -- --
-- -- -- -- - -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -
The outdoor design temperature is typically the coldest outdoor
air temperature of the year. This temperature is used when
doing the heat loss calculations for the building & is used to
size the heating system equipment. If a cold outdoor design
temperature is selected, the supply water temperature rises
gradually as the outdoor temperature drops. If a warm outdoor
design temperature is selected, the supply water temperature
rises rapidly as the outdoor temperature drops.
Boiler Indoor -- -- --- -- -- -- -- -- -- -- -- -- -- -- - -- - -- -- -- -- -- -
-- -- -- -- -- - -- -- -- -- -- -- -- -- -- -- - - -- -- -- -- -- -
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.
Boiler Design -- -- -- -- -- -- -- -- -- -- -- - - -- -- -- -- -- -- -- -- -- -
- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- - -- -
The boiler design supply temperature is the boiler water
temperature required to heat the zones at the outdoor design
temperature, or on the typical coldest day of the year.
(Default automatically changes based on terminal unit
setting)
Warm Weather Shut Down (WWSD) - -- -- -- - - -- -- -- -- -- --
Warm Weather Shut Down disables the heating system when the
outdoor air temperature rises above this programmable setting.
When the control enters into WWSD, WWSD is indicated in
the status field. WWSD is only available when the Application
Mode is set to RSET.
While in WWSD, the control will still operate to provide
Indirect Domestic Hot Water or Setpoint operation.
11 of 60
Boil DSGN
Boil MAX
120°F (49°C)
140°F (60°C) 140°F (60°C)
140°F (60°C)
160°F (71°C) 140°F (60°C)
190°F (88°C)
210°F (99°C) 140°F (60°C)
180°F (82°C)
200°F (93°C) 140°F (60°C)
160°F (71°C)
180°F (82°C) 140°F (60°C)
150°F (76°C)
170°F (77°C) 140°F (60°C)
- -- -- -- -- -- -- -- -- -- --
Heatronic 4000
*Boil MIN
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