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Benefit
Description
Setting
Note
Siemens Building Technologies
HVAC Products
4.171 Maximum d.h.w. storage tank charging
temperature
• Temperature limitation for d.h.w. storage tank charging with solar collector or wood-
fired boiler
Charging will be stopped as soon as the coldest d.h.w. storage tank sensor reaches the
maximum charging temperature.
Setting range
Line 522... line 500
EXP
500
d.h.w. storage tank safety temperature
EXP
Shutdown takes place only if the collector's overtemperature protection is not active
(operating lines 300
– 303
EXP
tinued until the d.h.w. storage tank' safety temperature is reached (operating line
500
). Then, the collector pump / boiler pump will be deactivated even if the collec-
EXP
tor's overtemperature protection is still active.
Heat transfer to the d.h.w. storage tank
4.172 Functioning
The "Automatic heat transfer" function permits the transfer of heat from the buffer stor-
age tank to the d.h.w. storage tank.
This can be accomplished either with the d.h.w. charging pump (Q3) or with the storage
tank transfer pump (ZuFu 3, Q11).
For heat transfer to take place, several criteria must be satisfied:
• The "Automatic heat transfer" function (operating line 531) must be activated (set-
ting 1 or 2)
• The temperature of the buffer storage tank must be higher than the temperature of
the d.h.w. storage tank plus the "Temperature differential ON" (operating line 534)
• The temperature of the d.h.w. storage tank must be lower than the nominal setpoint
of the d.h.w. temperature (operating line 26) minus the d.h.w. switching differential
(operating line 751
EXP
• Heat transfer must be released (operating line 532 and 533)
Heat transfer will be stopped as soon as the temperature differential between buffer
and d.h.w. storage tank is smaller than the "Temperature differential OFF" (operating
line 535), or when the d.h.w. storage tank has reached its setpoint.
During "Automatic heat transfer", no heat sources will be put into operation, unless the
automatic or manual "D.h.w. push" has been activated.
Basic Documentation RVP540 / RVP550
Description of the heating engineer settings
Unit
°C
). If it is active, d.h.w. storage tank charging will be con-
EXP
)
Factory setting
80
203/348
CE1P2488en
18.10.2002
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