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Siemens Building Technologies Basic documentation RVD240 CE1P2384en
HVAC Products 16 D.h.w. heating 27.05.2004
16 D.h.w. heating
16.1 D.h.w. heating with storage tanks
16.1.1 General
The RVD240 supports the following types of plant:
• Plants with coil type storage tanks where the heating circuit and d.h.w. heating use a
common heat exchanger
• Plants with stratification storage tanks where the heating circuit and d.h.w. heating
use 2 separate heat exchangers
Space heating and d.h.w. heating use a pump or mixing heating circuit.
The heat for storage tank charging is delivered by an intermediate circuit pump. Excep-
tions are plant types 1–3 and x–8.
16.1.2 Maximum charging time
The duration of d.h.w. charging can be limited to ensure the heating circuit will receive
sufficient heat also when d.h.w. heating cannot be terminated. The setting is to be
made on operating line 109. (setting ---).
On completion of the maximum duration of d.h.w. charging, d.h.w. heating will be
locked for the same period of time.
With the parallel priority, the maximum duration of d.h.w. charging will be inactive.
16.1.3 Manual storage tank heating
Manual storage tank heating (also called d.h.w. push) is triggered by pressing the op-
erating mode button
for d.h.w. heating for 3 seconds. It also triggers d.h.w. heating
when
• d.h.w. heating is not released
• the d.h.w. temperature lies inside the switching differential (also refer to forced
charging)
• the d.h.w. operating mode is on standby (holidays, d.h.w. heating OFF)
Operating mode ”D.h.w. heating ON” is switched on by activating manual d.h.w. charg-
ing; as an acknowledgement, the LED in the operating mode button flashes for 3 sec-
onds. Manual storage tank charging cannot be interrupted. It is terminated when the
required d.h.w. temperature is reached or when the maximum d.h.w. heating time has
elapsed.
If, after manual storage tank charging, d.h.w. heating shall return to standby, operating
mode button
must be pressed again.
Manual storage tank charging can be triggered via M-bus or LPB and passed on via
LPB (also refer to section 23.5 "Load management"
16.1.4 Forced charging
In the case of forced charging, the storage tank will be charged also when the d.h.w.
temperature does not drop below the d.h.w. switching differential.
This will take place depending on the program selected on operating line 101:
• Every day at the beginning of the first release period (release according to the d.h.w.
program or according to the heating program), or
• Every day at midnight if d.h.w. heating is continuously released (24-hour program)
Forced charging will be switched off when the d.h.w. setpoint is reached.
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