Plumbing And Sanitation Systems; The Fresh Water System - Tayana 37 Operation & Maintenance Manual

G. PLUMBING AND SANITATION SYSTEMS
Plumbing and sanitation systems are generally very reliable and require relatively little
maintenance. A program of inspections will usually prevent most problems from
developing. The critical points in the systems are the pumps; everything else is pretty
simple and reliable.

1. The Fresh Water System

The heart of the pressure water-system on the TAYANA 37 is the PAR medium
duty diaphragm pump. This pump is generally located in a compartment aft of
the companionway ladder along with the electric bilge pump and the shower
sump pump (an option). It can be recognized by the pressure switch located on
the side. You will find d manufacturer's parts list and a description of the pump
among the papers delivered to you with the yacht.
These pumps are highly reliable and will operate a couple of years without any
real maintenance requirement. If an occasion arises where a pump fails to
operate, one should first check the pressure switch. This simple switch can
accumulate dirt and not turn the pump on. If this should happen, turn off the
power to the pressure water system, remove the pressure switch from the pump,
and remove the switch housing. If the switch is dirty, carefully clean out the
accumulation, reassemble the switch and try the system. If this does not solve
the problem you probably have a defective switch and it should be replaced.
Two other common faults can cause the pump to malfunction--a broken belt,
which is immediately obvious, or defective diaphragms. To check the
diaphragms, remove the four screws in the top of the pump housing and
carefully lift the top off. You will see two diaphragms; examine each. If they are
defective it will be obvious--they will have holes or they will be out of the
diaphragm frame. Defective diaphragms should be replaced. PAR does produce
rebuild kits for these pumps. While it is not a bad idea to have a rebuild kit, the
most common requirement will be for a pressure Switch, diaphragms and belts.
Maintenance of the fresh water system requires little more than tightening the
hose clamps to prevent leaks. If your pressure pump comes on at intervals when
there is no demand there is almost certainly a leak which is allowing the
pressure within the system to drop. Inspection will almost invariably show that
there is a loose connection and air is getting into the lines. Again, tightening the
clamps will normally solve the problem.
Your hot water system is based on a ten gallon hot water heater, usually made
by American Appliance, Inc. It has both an electrical heating element and a
heat exchanger which gets hot water from the engine. It requires very little
maintenance beyond keeping it clean and all connections tight. The hot water
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