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Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of heating engineer settings 26.03.2001
4.58 Separate d.h.w. circuit
Type of d.h.w. heating in a cascaded system can be selected (charging pump /
diverting valve).
This function is used to switch the separate d.h.w. circuit on or off.
Setting range Unit Factory setting
0 / 1 – 0
The separate d.h.w. circuit can be switched on or off:
• OFF
The separate d.h.w. circuit is switched off. If d.h.w. heating is required, the d.h.w.
charging pump will be activated.
(A pump or nothing is connected to terminal Q3/Y3).
• ON
The separate d.h.w. circuit is switched on.
D.h.w. heating is provided via a diverting valve.
(A diverting valve is connected to terminal Q3/Y3).
In the case of d.h.w. heating with a diverting valve, one boiler of the cascade is used for
d.h.w. heating. It is only that boiler which satisfies the demand for d.h.w. During the
time the d.h.w. is heated, that boiler does not give consideration to any heat demand
from the consumers.
For the correct functioning of the separate d.h.w. circuit in a cascaded system, the
following conditions must be met:
− The device must be parameterized as a cascade slave (device no. >1).
− Parameter "Pump function output K6” must be set to boiler pump.
− Parameter "Separate d.h.w. circuit” must be set to ON.
− Paramter "D.h.w. controlling element" must be set to diverting valve.
Benefit
Description
Setting
Effect
Note
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