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Heatronic 4000 7738003455 (2014/04)10 of 60
Outdoor Temperature Reset Operation
Outdoor Temperature Reset is available by setting the
Application Mode in the Setup Menu to RSET.
In a heating system, the rate of heat supplied to the building
must equal the rate at which heat is lost. If the two rates are
not equal, the building will either cool off or over heat.
The rate of building heat loss depends mostly on the outdoor
temperature. Outdoor Reset allows a hot water heating
system to increase the water temperature, adding heat to the
building, as the outdoor temperature drops. The rate at which
the water temperature is changed as a function of outdoor
temperature is defined by the characterized heating curve.
Indirect Domestic Hot Water (IDHW) operation is available
during outdoor temperature reset operation.
Central Heat (CH) Call
----------------------------
A CH Call is required in order for the control to provide target
water temperature for the space heating system. Once the
control registers a CH Call, it will display the “Heat” icon
under the Calls in the display. A heat call can be provided
in two ways:
Contact Closure
A dry contact or 24 V (ac) signal is applied across the CH
Call terminals 5 & 6.
Characterized Heating Curve
- -- --- ---- ---- --- ----
A characterized heating curve determines the amount the
target water temperature is raised for every drop in outdoor
air temperature.
The characterized heating curve takes into account the
type of terminal unit that the system is using. Since different
types of heating terminal units transfer heat to a space using
different proportions of radiation, convection & conduction,
the supply water temperature must be controlled differently.
The control uses the terminal unit setting to vary the supply
water temperature to suit the terminal unit being used. This
improves the control of the air temperature in the building.
Boiler Characterized Heating Curve
Terminal
Unit
Boiler
Design
Boiler
Indoor
Outdoor
Design
Decreasing Outdoor Temperatures
Increasing Water Temperatures
Terminal Unit
- ------- -----------------------------
Select the appropriate terminal unit in the Setup Menu. This
will change the shape of the characterized heating curve
to better match the heat transfer properties of that specific
terminal unit.
Hydronic Radiant Floor (HRF1)
A heavy or high mass, hydronic radiant floor system. This type
of a hydronic radiant floor is embedded in either a thick concrete
or gypsum pour. This heating system has a large thermal mass
& is slow acting.
Dual Fuel Boiler Operation
The Heatronic 4000 supports the operation of dual fuel
boilers. Dual fuel boiler functionality is only available with
applicable Bosch / Buderus boiler models. The control allows
for up to two dual fuel boilers with selection capability for
Boiler 1 and Boiler 3.
If a dual fuel boiler is selected for boiler 1, the boiler 1 output
is used to control the gas burner and the boiler 2 output is
used to control the oil burner. Also, the boiler pump and,
if applicable, boiler outlet sensor, are to be connected to
boiler 1.
If a dual fuel boiler is selected for boiler 3, the boiler 3 output
is used to control the gas burner and the boiler 4 output is
used to control the oil burner. Also, the boiler pump and,
if applicable, boiler outlet sensor, are to be connected to
boiler 3.
Fuel Switch
- - - - - - - - - - - - - - -------------------------
A fuel switch is required in order for the control to switch
burner operation from gas to oil.
Once the control registers
a fuel switch, it will display FL SW in the status field. A
fuel switch is provided by a dry contact or 24 V (ac) signal
applied across the fuel switch terminals 9 & 10. The device
that provides a fuel switch is typically a manual switch
located on the boiler which selects what burner (gas or oil)
becomes active.
If the fuel switch is not present, the gas burner is active and
the oil burner is inactive. If the fuel switch is present, the oil
burner is active and the gas burner is inactive.
10


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