SDC / DHC

Hydraulic Components

 

 

With discharge protection activated and a hot-water demand present, the hot-water loading pump enabled only when the temperature in the heat generator rises by more than 5 K above the current temperature in the hot-water tank.

This measure prevents any rear tank discharge through the heat generator. The hot-water loading pump is disabled again as soon as the temperature differential between the heat generator and the hot-water tank has dropped to less than 2 K.

NOTE The heat generator minimum temperature limit operates continuously to protect the heat generator and blocks the hot- water loading pump in case of temperatures below the set value.

ATTENTION

In case of hot-water temperature specifications above 60°C, this function should not be activated to avoid safety switch- off (in particular for heat generators with a low water capacity).

Tank discharge protection must be set accordingly for hot- water loading from buffer tanks.

Boiler temperature This function determines the default setting of the tank loading offset temperature compared to the set hot-water circuit setpoint. In

case of setpoint modifications the heating energy needed for the hot-water supply is adjusted.

In case of several devices in the bus system and several hot- water circuits the tank loading temperature depends on the highest setpoint if several tanks are loaded simultaneously.

Switching differential This function determines the size of the hot-water circuit switching differential. The switching differential affects the relevant hot- water setpoint symmetrically.

Loading enabling The current hot-water temperature is lower than the hot-water setpoint by half the amount of the hot-water switching differential

Pump extended running The current hot-water temperature overshoots the hot-water loading cancellation circuit setpoint by half the amount of the hot-water switching

differential. After switching-off the heat generator, the tank loading pump is stopped only after a time delay to prevent a safety switch-off in case of high temperatures. The set value can be adjusted to the holding capacity of the hot-water tank used.

EN2H-0221GE51 R0808

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Honeywell EN2H-0221GE51 R0808 service manual Sdc / Dhc
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EN2H-0221GE51 R0808 specifications

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