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Siemens Building Technologies
Basic Documentation RVA47.320
CE1P2379E
HVAC Products
Description of the heating engineer settings
15.07.2002
4.44
Demand for heat with reduced d.h.w.
setpoint
•
Selectable type of heat demand with reduced d.h.w. setpoint
In connection with alternative sources of energy, an early release of heat generation
(BMUs) for d.h.w. heating outside the main occupancy times is often undesirable. A
choice of two different procedures is available releasing the cascade earlier or later.
1. Press the operating line selection buttons to select operating line 129.
2. Press the + / - buttons to select the required assignment.
Setting range
Unit
Factory setting
0 / 1
-
1
The setting determines whether or not heat generation will be released for maintaining
the reduced d.h.w. setpoint:
No
(use with buffer storage tank and alternative heat source).
Outside the main occupancy hours, the attempt is made to bring the d.h.w.
temperature to the reduced setpoint level using energy from the buffer storage
tank. This means that the d.h.w. charging pump runs but the demand for heat
will be suppressed. Heat generation for d.h.w. charging will be released only
(d.h.w. push) when the d.h.w. temperature has dropped below the reduced
setpoint by twice the d.h.w. switching differential (41
OEM
).
Yes
(standard procedure).
Outside the main occupancy hours, the d.h.w. temperature is raised to the level
of the reduced setpoint. This is accomplished by sensing a heat demand signal
to the heat source (individual boiler or cascade).
Benefit
Description
Setting
Effect
