Comprehensive Manual82
© 2018 Nortek AS
housing.
3.8.3 Recommended Torque for Securing Screws
When installing end caps and sensor heads, care should be taken when tightening the screws.
1. Just a little tension on the screw is needed.
2. When the O-ring starts to be compressed, turn each screw a little at a time until the O-ring is fully
compressed.
3. Tighten the screws diagonally. Tightening one screw fully before continuing on to the next may
cause improper O-ring seating and very high mechanical stress concentrated around the screw
hole. This may cause leaks and/or damage to the head or the endbell.
4. The screws only need to be tightened sufficiently for the O-ring and spring washers to be fully
compressed.
Figure: a) "Tw o-fingers" tightening of screw s. Indicator arrow show s position before final tightening. b)
Final tightening 30-45 degrees from "tw o-fingers" tightening.
Over-torqueing has no positive effect and may damage the threads and/or area around the screw
holes on the head and endbell. Keep in mind that ocean pressure holds the end cap tightly – all the
screws have to do is to keep the end cap from falling out when the system is above water.
3.8.4 Connector Care
It is extremely important to keep underwater connectors clean and well lubricated. We recommend
before plugging in connectors, always blast the pins with compressed air, inspect them for
cleanliness and then lubricate with 3M Silicone Spray. Do not use the silicone grease included in the
toolkit on connectors, as this is intended for O-rings only.
Before deployment:
Demate the connector set.
Flush the connector set with fresh water or compressed air, remove dirt.
Inspect for damage, corrosion and cuts.
Apply a thin film of 3M Silicone Spray or equivalent.
Mate the connector halves and check if they are properly mated.
After deployment, before storage:
Flush the connector set with fresh water or compressed air, remove dirt.
Inspect for damage, corrosion and cuts.
Mate with dummy plug if available.
3.8.5 Cable Care
Avoid nicks and cuts around connector points, as these are the sealing surfaces.
Elastometers can be seriously degraded if exposed to direct sunlight or high ozone levels for
extended periods.
Do not pull on the cable to disconnect connectors, pull the connector itself.
Avoid sharp bends at cable entry to connector.
Ensure that the cable is fixed to the mounting fixture to avoid mechanical stress to the connection.
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