Tekmar 265 Boiler Control Bedienungsanleitung PDF herunterladen (Seite 16)

Section E1: Setpoint

Note: Setpoint operation is only available when DHW MODE is set to OFF.

SETPOINT

The control can operate to satisfy the requirements of a setpoint load in addition to a space heating load. A setpoint load overrides

the current outdoor reset temperature and WWSD setting in order to provide heat to the setpoint load.

SETPOINT DEMAND

A Setpoint Demand is required in order for the control to provide heat to the setpoint load.

The control registers a setpoint demand when a voltage between 24 and 230 V (ac) is

applied across the Setp / DHW Dem and Com Dem terminals (31 and 30). Once voltage

is applied, the Setpoint Demand pointer turns on in the LCD. The control operates the

boiler(s) to maintain at least the setpoint setting.

BOILER TARGET DURING SETPOINT

The boiler target temperature during a setpoint demand is increased to at least the Setpoint

setting. This temperature is maintained as long as the control has a setpoint demand.

SETPOINT MODE

SETP MODE 1 - Setpoint in Parallel

Whenever a setpoint demand is present, the boiler(s) is operated to maintain the setpoint target. The primary pump contact does not

close, but may operate based on a Boiler Demand or on an external input system.

It is assumed that the Setpoint pump will provide adequate flow through the heat exchanger and the boiler.

SETP MODE 2 - Setpoint in Parallel with Priority

Whenever a setpoint demand is present, the boiler(s) is operated to

maintain the setpoint target and the primary pump (Prim P1) contact

is opened.

It is assumed that the Setpoint pump will provide adequate flow

through the heat exchanger and the boiler.

SETP MODE 3 – Primary Pump during Setpoint

Whenever a setpoint demand is present, the primary pump (Prim P1) is turned on and the boiler(s) is operated to maintain the

setpoint target.

SETPOINT PRIORITY OVERRIDE

The setpoint has a Priority Override while in SETP MODE 2. In order to prevent the building from cooling off too much or the

possibility of a potential freeze up during setpoint priority, the control limits the amount of time for setpoint priority. The length of

Setpoint priority is determined by the Priority Override setting. Once the allowed time for priority has elapsed, the control overrides

the setpoint priority and operates setpoint and heating simultaneously by turning on the primary pump (Prim P1).

CONDITIONAL SETPOINT PRIORITY

If the boiler(s) supply temperature is maintained at or above the required temperature during setpoint generation, this indicates that

the boiler(s) has enough capacity for setpoint and possibly heating as well. As long as the boiler target temperature is maintained

and the heating and setpoint targets are similar, setpoint and heating occur at the same time.

Com

Dem

Setp/

Dem

24 to 230 V (ac)

Setpoint Device

Boiler

Pumps

Primary

Pump

Section E1

Setpoint

Section E: Setpoint Operation

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