308/348
Siemens Building Technologies
Basic Documentation RVP540 / RVP550
CE1P2488en
HVAC Products
Description of the EXP settings
18.10.2002
D.h.w. storage tank EXP
5.47 D.h.w. storage tank safety temperature
•
Limitation of the maximum permissible d.h.w. storage tank temperature
The maximum permissible temperature in the d.h.w. storage tank (coldest sensor) can
be adjusted. At this temperature, the collector pump will be deactivated even if collector
overtemperature protection (refer to operating lines 300
EXP
- 302
EXP
) would still require
the pump to run.
Setting range
Unit
Factory setting
20...95 °C
90
By using the coldest sensor, the maximum amount of heat energy can be delivered to
the buffer storage tank. If, in the meantime, some other storage tank sensor has ex-
ceeded the absolute temperature limit (operating line 500
EXP
+5 K), any charging opera-
tion will be stopped, even if the coldest sensor has not yet reached the maximum safety
temperature that can be adjusted.
For the settings required in connection with d.h.w. storage tank overtemperature pro-
tection, refer to operating lines 540…544.
Space heating EXP
5.48 Boost of the flow temperature setpoint at the
mixing valve (UEM)
•
Efficient control of mixing heating circuits
By adding cooler return water to the water delivered by the boiler, boiler temperature
variations will be smoothed out, enabling the mixing valve to produce more constant
flow temperatures.
However, to achieve the desired mixing, the actual value of the boiler’s flow tempera-
ture must be higher than the required mixing valve flow temperature setpoint. If this is
not observed, the setpoint cannot be attained within the required period of time. Hence,
this setting raises the mixing valve flow temperature setpoint.
Setting range
Unit
Factory setting
0...50 K
10
The setting raises the boiler temperature setpoint when the mixing heating circuit calls
for heat.
Increase:
Reduced risk of flow temperature undershoots
Decrease:
Flow temperature undershoots possible
Benefit
Description
Setting
Note
Benefit
Description
Setting
Effect
