General
The built-on cooling water preheating unit consists
of a thermostat-controlled el-preheating element
built onto the outlet connection on the thermostat
housing on the engine's front end box. The pipe is
connected below the non-return valve on the pipe
to expansion tank.
Cyl. No. Preheater
3x400V/3x440V
kW
5-6 1 x 15
7-9 1 x 24
The system is based on thermo-syphon cooling and
reverse water direction, i.e. from top and down-
ward, and an optimal heat distribution in the engine
is thus reached.
When the engine is in standstill, an extern valve
must shut off the cooling water inlet.
Operation
Engines starting on HFO and engines in stand-by
position must be preheated. It is therefore recom-
mended that the preheater is arranged for auto-
matic operation, so that the preheater is disconnec-
ted when the engine is running and connected
when the engine is in stand-by position. The ther-
mostat setpoint is adjusted to 70°C, that gives a
temperature of app. 50°C at the top cover.
MAN Diesel & Turbo
3700160-9.0
Page 1 (1)
Preheater arrangement in high temperature system
B 13 23 1
L27/38S, L27/38
2015.11.27
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