MJM Yachts 36z Express - Manual (Page 42)

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7.1
7.2
7.3
7.4
7.5
FRESHWATER SYSTEM
GENERAL
Your boat incorporates a pressurized freshwater system. A single 100-gallon tank supplies a
pump which maintains a constant pressure in the system.
FILLING
A deck fill is provided on the starboard side and is labeled WATER. As the tank is filled, air
escapes thru the vent.
USING & MAINTAINING
The freshwater pump is turned on at the DC breaker panel. If the pump is heard running
continually, check that no faucet has been left open. If this is not the case, turn off the pump and
check that the tank has not been emptied. The freshwater system is not a perfectly sealed circuit
and it is not uncommon to hear the pump cycle, but if this short cycling occurs more than once
per hour, the system and/or pump should be checked for leaks. Some users will want to turn the
pump off at night to avoid hearing it cycle.
The pump is protected from sediment by an in-line strainer mounted adjacent to the pump. The
strainer should be checked periodically and cleaned if necessary.
DOCK INLET
A dock inlet is installed to permit hooking up with a standard hose. When hooked up to dock
water, be sure to turn OFF the Fresh Water breaker on the DC Panel, because pressure is then
from the city supply and it’s possible that should boat pressure exceed city water pressure, you
could empty your tanks, donating boat water to the city water supply.
HOT WATER
Water in the 13-gallon hot water tank is heated in one of 2 ways:
(1) By the engine through the heat exchanger whenever the engine is running or for as long as
24 hours after then engine has stopped run and the Water Heater is turned OFF.
(2) When the Water Heater breaker on AC Panel #2 is turned ON and the boat is connected to
shorepower or the generator is running.
The hot water tank is part of the freshwater system and does not need to be filled separately.
There is virtually no need for maintenance, but the connections at the tank should be visually
inspected occasionally.
The coolant lines from one engine to the tank have shut-off valves, located in the forward port
side of the engine compartment. These need to be open in order for the engine to heat the water
in the tank. For service, or in case or a ruptured line, these valves can be closed to stop this
water loop.
GENERAL ECOLOGY SEAGULL WATER PURIFIER (Option)
[See also Seagull owner’s manual] The galley is fitted with the best available water purifier in the
world. It is used on 85 airlines. This purifier has a cartridge (in stainless pressure vessel under
sink) that should be replaced annually or when reduced water flow indicates that it has become
plugged with sediment. It is best to clear the pressure water system of any winter anti-freeze
before running water through the cartridge. The filter is rated for 1000 gallons, which is
approximately 15 water tanks’ worth. Replace it at least once per year.
CHAPTER 7 35