MAINTENANCE FOR UNITS IN TROPICAL WATERS

ZINCS

This is an important procedure.  A full flow SEA FROST condenser without a zinc or without the bonding strap connected will last a very short time.  Be sure to check the wear by inspection.  Replace every six months or sooner if inspection reveals excessive wear.

If the zinc breaks in the brass plug remove the remaining zinc by melting it with a propane torch.

ALKALI SCALE

Condensers will scale after several years in warm water causing higher head pressures due to scale interfering with the heat exchange.  Remove the zinc. Plug the hole in the condenser with a 3/8" npt pipe plug.  WARNING: Leaving the zinc in place will make a big battery upon adding acid.  This will produce heat and smoke. Don't forget to remove the zinc.  Remove the top hose on the condenser and pour muriatic acid into the condenser until it boils out the top.

WARNING: Be sure to follow safety precautions on the muriatic acid container. 

Most muriactic acid is bottled at 5%-7%. This concentration is what we recommend.

When boiling (Foaming) will stop in 4 or 5 minutes.  There is no danger of damage to the condenser.  Reconnect the hose to the engine and start the engine with the through hull open.  After a minute or two of operation to flush out the acid, shut off the engine and through hull and replace the zinc. 

CLUTCH COILS

Clutch coils fail from heat breaking down the wire insulation in the winding.  Damaging heat can be caused by operation with too much charge and by scaling.  Clean the condenser.  Be sure the charge is minimum for a clear glass.  No more than 24oz for most systems.  A single plate or block system will need less than 24oz of refrigerant.

SEA FROST, 372 Route 4, Barrington, NH 03825 USA
Tel: (603) 868-5720 ~ Fax: (603) 868-1040
1-800-435-6708 (USA, Canada & Caribbean)
e-mail: sales@seafrost.com