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Siemens Building Technologies Basic Documentation RVL471 CE1P2524E
HVAC Products 25 Function block "Service functions and general settings" 23.10.2002
T
A
2524D04
ON
OFF
0,5 °C
BZ 167
0,5 °C
BZ167 Operating line 167
TA Outside temperature
OFF Frost protection OFF
ON Frost protection ON
If the outside temperature falls below the limit value (setting on operating line 167 mi-
nus 0.5 °C), the RVL471 will switch the circulating pump on (pump connected to termi-
nal Q1) and maintain the flow temperature at the selected minimum level.
The control is switched off when the outside temperature exceeds the limit value by
0.5 °C.
Frost protection for the plant can be deactivated.
25.4.2 Flow alarm
The fault alarm triggers an error message if the flow or boiler temperature does not
reach the required setpoint band (setpoint ± a defined switching differential) within a
defined period of time – provided there is a demand for heat. This period of time can be
set on operating line 171.
• Plant type 1–x, 3–x, 4–x and 6–x: Decisive is the temperature acquired by sensor B1.
The switching differential corresponds to the neutral zone (±1 °C)
• Plant types 2–x and 5–x: Decisive is the temperature acquired by sensor B1. The
switching differential corresponds to the adjusted switching differential of the boiler (±
0.5
*
SD; operating line 94)
The display shows the fault status message as ERROR. More detailed information is
given on operating line 50 under error code 120.
The flow alarm can be deactivated by entering --:--.
ERROR
t
T
V
wx
2524D05
t
A
t
A
t
A
t
1
t
2
y
tTime
t
1
Start of error display
t
2
End of error display
t
A
Waiting time (set on operating line 171)
TV Flow temperature
wSetpoint
x Actual value
Y Setpoint band
• At t
1
, error message is triggered; during the period of time t
A
(set on operating line
171), the actual value stayed below the setpoint band y
• At t
2
, the error message is reset; the actual value “x” has reached the setpoint band “y”
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