Tekmar 284 Boiler Control Bedienungsanleitung PDF herunterladen (Seite 10)

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A Watts Water Technologies Company

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) & setpoint operation

are both available during outdoor temperature reset

operation.

Heat Call

-----------------------------------------

A Heat Call is required in order for the control to provide target

water temperature for the space heating system. Once the

control registers a Heat 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 Heat

Call terminals 5 & 6.

tekmarNet

Device

A tN4 thermostat wired to one of the tN4 Bus terminals.

Characterized Heating Curve

---------------------

A characterized heating curve determines the amount the

target water temperature is raised for every 1° 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.

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.

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