Fig 9-9
Example diagram for common auxiliary engines and a low speed main
engine with mixed LT and HT circuit (DAAE026912A)
Notes:
* Preheating flow
** Depending of ME type
The preheating unit (4N01) is needed for preheating before start of first auxiliary engine AE, if heater (4E05) is not installed.
The pump (4P04) is used for preheating of stopped main engine ME and auxiliary engine AE with heat from running auxiliary engine.
The pump (4P14) preheats the stopped auxiliary engine AE when main engine ME is running.
The heater (4E05) is only needed if the heat from the running auxiliary engine is not sufficient for preheating the main engine, e.g.
in extreme winter conditions
It is not necessary to open/close valve when switching on the preheating of main engine or auxiliary engine.
System components:
Circulating pump (HT)
4P14
Lubriating oil cooler
2E01
Circulating pump (LT)
4P15
Heat recovery (evaporator) ME
4E03-1
Circulating pump (evaporator)
4P19
Heat recovery (evaporator) ME + AE
4E03-2
Circulating pump (preheating HT)
4P20
Heater (preheater), optional
4E05
Air venting
4S01
Central cooler
4E08
Expansion tank
4T05
Cooler (installation parts)
4E12
Temperature control valve (HT)
4V01
Cooler (generator)
4E15
Temperature control valve (central cooler)
4V08
Cooler (scavenge air)
4E21
Temperature control valve (heat recovery and preheating)
4V12
Heater (booster), optional
4E22
Preheating unit
4N01
Pipe connections:
LT-water outlet
452
Water from preheater to HT-circuit
406
HT-water inlet
401
LT-water air vent from air cooler
454
LT-water inlet
451
HT-water outlet
402
HT-water air vent
404
Wärtsilä 32 Product Guide - a21 - 7 September 2016
9-11
9. Cooling Water System
Wärtsilä 32 Product Guide
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