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10. Operation monitoring
A separate purging of the connection lines including standpipe is
demanded for float switches.
10.1 Purging of connection lines
•
Close shutoff valves (W+D) (see sketch chapter 5).
•
Slowly open drain valve (14) and drain water of standpipe.
•
Slightly open shutoff valve D and close after approx. 2 seconds.
•
Slightly open shutoff valve W and close after approx. 2 seconds.
•
Close drain valve (14).
•
Slightly open shutoff valves W+D (standpipe is filled now).
•
Fully open shutoff valves W+D after the standpipe is filled.
10.2 Function test
A function test is prescribed for float switches. Tests extend and delays
must be specified between operator, boiler manufacturer and local
expert.
•
Close shutoff valves (W+D) (see sketch chapter 5).
•
Slowly open drain valve (14) and drain water.
•
The float device sinks now under LWL and the magnetic switch is actuated.
The prescribed function test is finished.
•
Close drain valve (14).
•
Slowly open shutoff valve W and then shutoff valve D.
Caution
Caution
