Diesel Pumps With Direct Air Cooling; Diesel Pumps With Water/Water Heat Exchanger - Grundfos Hydro EN Installation And Operating Instructions Manual

4.1.1 Minimum space
The pictures below give an indication of the minimum free space
to be left around the system.
A
A
Top view of the technical room
B
Side view of the technical room
Pos. Description
A Minimum 800 mm
B Minimum 2400 mm

4.2 Diesel pumps with direct air cooling

A fan, driven by the engine itself, generates air flow that is
conveyed to the engine and ensures cooling. The heat is then
released into the environment and must be extracted from the
room.

4.3 Diesel pumps with water/water heat exchanger

In the system, the cooling of liquid-cooled engines is provided by
a water/water heat exchanger with an expansion tank.
When the engine is warm, a pressure, which will cause hot liquid to
be discharged by extreme forces, is created in the cooling circuits.
This results in a danger of burning. The cooling circuits may remain
hot and pressurised even after the engine has been shut off.
CAUTION
Hot surface
A
Death or serious personal injury
‐
The engine is cooled by the water of the firefighting system.
Do not let the engine run at a speed lower than the
nominal speed. A low speed rotation may cause an
insufficient cooling flow of water through the heat
exchanger and a possible engine damage due to
overheating.
Do not restrict or block the outlet of the heat exchanger.
Avoid long and tortuous routes that can restrict the flow of
passage water. Do not fit any component in the outlet pipe
(gate valve or other) that can affect the proper circulation
of cooling water.
Install the outlet pipe of the heat exchanger to visually
inspect the effectiveness and correctness of water
circulation.
The heat exchanger outlet must be installed close to the
diesel pump.
Clean the filter regularly, and make sure that there is
proper water circulation in the cooling system.
Make sure that the flow through the cooling system meets
the minimum requirement as specified in the technical
documentation for the specific model.
The outlet of the heat exchanger must be connected to
the drain pipe with a flexible joint to avoid any mechanical
stress on the heat exchanger.
The heat exchanger circuit is connected to the pump outlet just
before the check valve with a pipe of appropriate size.
During pump operation, a part of the flow of the system circulates
through the heat exchanger to provide cooling for the diesel engine.
This flow does not contribute to the supply of the firefighting system
and must be considered in the hydraulic calculation and when
choosing the system.
For values of minimum flow required to pass through the heat
exchanger, refer to the performance curves of the system.
8
Heat exchanger
Open the coolant tank cap only when the engine is
cold and only if strictly necessary.
7
A
4 5 6
1
3
2
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