SDC / DHC

Hydraulic Components

 

 

7.3.12.2Function of the cascade parameters

Switching differential Each heat generator has its own switching differential. The cascade switching differential must be set in such a way that it is always larger than the switching differential of any individual heat generator.

Connection delay The afterheating characteristics of the boilers used must be taken into account when rating the heating system. The cascade switch- on delay is used to adjust the system to the start-up delays of the individual boilers. When does the heat generator deliver its energy into the system after being switched on (start-up phase, pre-running time)? The appropriate setting is the maximum delay time of the boilers in the system.

Deactivation delay To prevent all heat generators switching off simultaneously if the set cascade switching differential is exceeded, the run-down of heat generators is controlled by the switch-off delay. The setting has to be adjusted to the afterheating characteristics of the heat generators.

Stage reversal To ensure the balanced utilisation of the heat generators within a cascade, a runtime-dependent leading stage swap can be activated.

After the set operating time of the presently leading heat generator has passed, the system switches to the heat generator with the next higher bus address.

Stage swap can only be executed between several central devices. It cannot be applied if several condensing boilers are switched by a single central device.

Guidance stage The leading cascade stage can still be set manually to any existing stage even when automatic stage-sequence switching is disabled.

NOTE Changing the heat generator type within the central device at address 10 leads to an automatic reset of the leading stage to the first heat generator.

EN2H-0221GE51 R0808

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Honeywell EN2H-0221GE51 R0808 service manual Function of the cascade parameters
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