Tekmar 156 Difference Setpoint Control Manual do Utilizador descarregar pdf (Página 4)

MAXIMUM STORAGE SETPOINT

If the measured storage temperature rises above the Maximum Storage Setpoint, the relay is turned off. The relay remains

off until the storage temperature drops below the Maximum Storage Setpoint less the Maximum Storage Differential.

The Maximum Storage Setpoint stops the transfer of heat when the storage temperature rises above the Maximum

Storage Setpoint, which prevents the storage tank from over heating. Turning off the relay allows heat to be drawn out of

the tank to satisfy any heating loads without heat being returned to the tank from the heat source, thus lowering the tank

temperature.

Relay operation showing the

turn on and turn off points with

respect to the Max Storage

Setpoint and Differential.

Relay operation showing the

turn on and turn off points with

respect to the Min Source

Setpoint and Differential.

Min Source

Differential

Min Source

Setpoint

OFF

Increasing Time

Increasing

Temperature

Increasing Time

MINIMUM SOURCE SETPOINT

If the measured source temperature drops below the Minimum Source Setpoint, the relay is turned off. The relay remains

off until the source temperature rises above the Minimum Source Setpoint plus the Minimum Source Differential.

The Source Minimum Setpoint does not provide freeze protection; it only stops the transfer of heat when the source

temperature falls below the Minimum Source Setpoint. The heat source is still susceptible to freezing. Turning off the relay

allows the heat source to gain heat by stopping the heat transfer to the storage tank.

Max Storage

Differential

Max Storage

Setpoint

OFF

Increasing Time

Increasing

Temperature

Increasing Time

T SETPOINT

The control measures the difference between the source and the storage temperatures (T). When the measured T is

greater than the T setpoint, the relay is turned on to transfer heat from the source to the storage. If the T drops below

the T Setpoint less the T Differential, the relay is turned off.

∆T Differential

∆T

Setpoint

OFF

Increasing Time

Increasing T

Relay operation showing

the turn on and turn off

points with respect to the ∆T

Setpoint and ∆T Differential.

Typical Settings ∆T Setpoint Differential

With a heat exchanger 15 to 25°F (8 to 14°C)

10 to 15°F

(6 to 8°C)

Without a heat exchanger 13 to 21°F (7 to 12°C)

1 2 3 4 5 6 7 8 9 10 11 12

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