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Siemens Standard application AHU CE1P3977en_02
Building Technologies Functions 01.02.2010
An outside air and room or return air temperature sensor required. If both a room
and return air sensor is active then the return air sensor is used.
The function is blocked when the sensor fails.
5.7.2 Heat recovery Pump
Heat recovery pump is enabled:
Main Index > Configuration > Configuration 2 > Hrec (pump) / cmd <> No
The pump starts, if one of the following conditions is met:
• No fault is pending and the heat exchanger valve is opened to at least 5 %.
or
• Pump kick is enabled.
The pump stops for the following cases:
• A fault occurs.
or
• The heating valve is under 1 %.
The pump output can, e.g. for a heat wheel, be used as a digital enable as well.
The pump kick should not, however, be enabled in this case.
Operating hours for the pump can be recorded and reset:
Main Index > Unit > Operating hours > Hrec (pump) cmd
Main Index > Unit > Temp control > Heat recovery > Pump/Cmd
Parameter Range Function
Command – Off
– On
Current pump state. Go to page with digital out-
put settings.
Fdbk – OK.
– No fdbk
Present state of pump feedback.
Go to page with digital input settings. For exam-
ple, you can set the time for jitter protection (De-
fault: 5 s).
Alarm – OK.
– Alarm
Current pump alarm state.
Go to page with digital input settings. For exam-
ple, you can set the time for jitter protection (De-
fault: 0 s).
Start up delay fdbk 0...36000 [s] Defines the period after a pump start without
feedback before a feedback alarm is triggered.
Jitter time is enabled exclusively if the feedback
is pending after this period.
Off by fdbk alarm – No
– Yes
Determines, in the event of a feedback fault,
whether a pump command is still pending or
whether to switch off the command.
Min run time 0...36000 [s] Define the minimum runtime for the pump after a
start.
Feedback can only be used as alarm, when Contact function = NO (Normally
Open) and the element is set to ON.
5.7.3 Pumpenkick
Note
Sensor failure
Prerequisite
Function
Note
Record operating hours
Parameter
Note
Basis Document Siemens Climatix Control System
BDCX.100820.01GB
Page 71
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