GREAT WATER Isotemp 0401M Manual de instrucciones de instalación y funcionamiento - Página 4
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Imprimir página3 Connections
3.1 Fittings
Use good quality fittings to make all connections. Bronze, stainless steel and corrosion resis-
tant brass alloys are recommended.
Most plastic fittings will not withstand high temperatures
and are not recommended. All US tanks use a ½" female BSP threaded coupling that will mate
with ½" male NTP adapters. Use a curing pipe sealant on the threads such as Loctite PST 592
to insure a leak-free connection.
3.2 Hoses
Use hoses rated for use with engine coolants and high temperature of 210°F for the connections
to the heat exchanger.
Hoses used for the water system should be rated at 125 psi and approved for use with potable
water systems.
3.3 Connections to Engine
Isotemp water heaters may be used with either fresh water or raw water-cooled engines. For
good results an operating temperature of 130°F to 165°F is recommended. (For magic tanks a
temperature of 180°F is recommended for good results.)
The heat exchanger requires a flow
of one half gallon (2 liters) per minute for efficient heating of the water in the tank. Please
follow recommendations of the engine supplier for how to make the connections to the engine
cooling system. Keep the diameter of the fittings and hoses large enough to maintain low flow
resistance. 5/8" (16 mm) is a very common size for these hoses.
3.4 Freshwater System Connections
The water tank inlet is normally fed from
the water system electric pressure pump.
The pressure switch on the pump should be
Fig. 2
adjusted to a maximum of 42 psi (3 bar).
Please note that the pressure relief valve on
the tank is set at 58 psi (4 bar). If the sys-
tem pressure goes above this setting the re-
lief valve will open and water will be r e-
leased to the drain.
The tank outlet is fitted with a tempering
valve (also called a thermostatic mixing
valve) that will mix cold water with the hot
water to reduce the temperature to a safe
level. This temperature can be adjusted with
the knob mounted on the side (Fig. 2).
(Older Isotemp models have temperature
knobs which read "V" and "K" instead of "+"
and " -". "V" indicates hotter and "K" indicates colder.) Adjust this counterclockwise to in-
crease the temperature of the water. All hot water taps on the boat should be a mixer type
that will allow for mixing of cold and hot water at the tap.
The drain valve is integrated into the pressure relief valve and is mounted on the bottom of the
tank. A hose can be fitted to the drain. A small quantity of water will normally drain from the
relief valve as the tank is heated.