6.18.1 Introduction
Perform the following checks when you maintain your pumping system:
•
Check that the disconnect box is securely fitted on the wall.
•
Check that all electrical connections are secure and that electrical cables are not damaged.
The disconnect box and photohelic switch/gauge contains no serviceable parts. Repair of
faults by the user is limited to replacement of fuses, and resetting of the circuit breakers.
If any other repairs are required, contact your supplier or your nearest BOC Edwards Service
Centre for advice.
6.18.2 Fault finding
If you suspect that a fault exists in the disconnect box, check the possible causes and carry out
the remedial actions described in the following table before returning the disconnect box to a
Service Centre.
Symptom Probable Cause Recommendations
The disconnect box will
not power up
A fuse has blown Check fuses F1 through F6
and replace if required
Incoming electrical supply has
failed
Check the electrical supply
Photohelic gauge in warning state Rectify situation and reset CB1
Brownout condition over 3 seconds Rectify situation and restart
system
Photohelic gauge will
not operate
Circuit breaker CB1 tripped Rectify situation and reset CB1
6.18.3 Fuse replacement
The fuses are mounted in standard fuse holders. The use of a fuse puller is recommended
when checking or replacing blown fuses.
If fuses blow regularly, this indicates a probable fault in the disconnect box or electrical
connections. Isolate and rectify the fault before reusing the disconnect box.
6-20 iH Dry Pumping Systems
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