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Siemens Building Technologies
Basic Documentation RVP540 / RVP550
CE1P2488en
HVAC Products
Description of the EXP settings
18.10.2002
5.20 Hysteresis for maximum limitation of the
collector temperature
•
Adjustable hysteresis for maximum limitation of the collector temperature
The switch-off point for the collector pump can be set via a hysteresis. When there are
2 collectors, the same hysteresis will apply to both collectors.
Setting range
Unit
Factory setting
1...20 °C
5
When maximum limitation of the collector temperature is reached, the collector pump
will be switched on and switched off again via the hysteresis (if a diverting valve is
used, it will be driven to the respective position).
P
on
off
°C
2392
Z
30
TK
140
135
130
125
P Collector
pump(s)
TK
Collector temperature on sensor B6 (and B61)
300
EXP
and
301
EXP
Maximum limitations of the collector temperature
302
EXP
Hysteresis for maximum limitation of the collector temperature
5.21 Collector frost protection temperature
•
Adjustable temperature for frost protection for the collector
Frost protection for the collector prevents the collector(s) from freezing at low outside
temperatures. When there are 2 collectors, the setting applies to both.
Setting range
Unit
Factory setting
--- / -20...+5
°C
- - -
Entry:
---
Frost protection for the controller is switched off.
For plants with sufficient amounts of glycol added.
-20...5 Frost protection for the collector is switched on.
For plants with little or no glycol added to the collector circuit.
If the temperature at the collector sensor falls below the adjusted level,
the collector pump will be activated and the bypass valve driven to the required
position so that heat from the storage tank is supplied to the solar system.
As soon as the temperature at the collector sensor lies 1 K above the adjusted
value, the collector pump will be deactivated while observing an overrun time
of one minute.
Benefit
Description
Setting
Effect
Benefit
Description
Setting
Effect
