Installation - Vetus WHT25 Operation Manual And Installation Instructions

1 Introduction
The tap water in the boiler's tank will be heated by one of the follow-
ing heat sources:
- Engine coolant flowing through one of the heating coils.
- CH water from the ship's heating system flowing through the sec-
ond heating coil,
- The built-in electrical heating element.
2 Use
Proceed as follows before using the calorifier for the first time.
• Clean the inside of both the tank and heating coils by rinsing
them with clean tap water.
• Open the stop cock in the water pipe between pump and tank.
Open the hot water tap to release air from the tank and it fills with
water.
• Fill the heating coils from the engine's cooling system and the
ship's heating system respectively.
• Bleed air from the outer tank if this is mounted vertically. 'E' is the
outer tank air bleed valve.
• Check all connections, pipes and fittings for leaks.
In the event of a leak, stop the engine immediately or switch off
the ship's heating system and repair the leak before restarting
the engine or switching on the heating system.
• Stop the engine and check the coolant level. Top up if necessary.
• Check the liquid level of the heating system and top up if neces-
sary.
• The calorifier is now ready for use.
2.1 Heating with engine heat
The engine has to run for a certain time before the tap water heats
up. The time required depends on the size of the calorifier and the
size of the engine.
The hot tap water can be very hot, temperatures up to 80˚C
(176˚F) are possible!
For safe use, always mix with cold water.
2.2 Heating while the engine is idle
When the engine is idle, the water can be brought to and maintained
at the desired temperature through the ship's heating system or the
electrical heating element.
Heating tap water in the boiler tank in this manner usually takes con-
siderably more time than by using the heat of the engine.
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aution
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The amount of heat created by an internal combustion engine,
and thus available for heating the calorifier, is about the same as
the engine power output. So an engine which delivers 50 kW at
the shaft will also provide about 50 kW of heat! Generally speak-
ing, a ship's heating system has a substantially smaller heat ca-
pacity and an electrical heating element is only 1.5 kW or less.
Never switch on the electric heating element if the calorifier
tank is not completely filled with tap water.
3 Preparation for Winter
The water should always be drained from the calorifier. To do this, re-
move the hose connections 'C' and 'D' and both plugs from the non-
return valve '3-F' . Open the tap so that the pipes and calorifier tank
drain completely.
The heating spiral does not require draining.
4

Installation

4.1 General
First consult the piping diagrams and installation drawing, see draw-
ing on pages 14 through 17.
Preferably fit the boiler low in the ship so that highest point of the
boiler is at a lower level than the expansion tank of the ship's engine.
This is in connection with removing air from the system, see draw-
ings 1.
The engine can be connected to the heating coil via connections 'A1'
and 'B1' or connections 'A2' and 'B2' .
The heating coils are identical.
The flow direction of the engine coolant through the coils has no im-
pact on their correct operation.
If the boiler does have to be positioned above the level of the expan-
sion tank for the engine an additional expansion tank must be fitted,
see drawing 2.
Fit a shut-off valve between the expansion tank and the highest
placed pipe between the engine and the boiler. This shut-off valve is
closed during normal operation and only opened when topping up
or bleeding the system.
If the calorifier is installed considerably lower than then the engine's
expansion tank, the coolant water can start to circulate when the en-
gine has stopped. This will lead to very fast cooling of the hot tap
water. To prevent this, install a non-return valve - see drawing 3. A
stop cock can also be used instead of a non-return valve.
The resistance in the pipe can become too high if the pipes between
the engine and the boiler are extremely long. The cooling fluid will
then no longer circulate through the boiler. In that case fit a central
heating circulation pump in the pipe, see drawing 4.
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vetus® Water Heater WHTxx