Eberspächer HYDRONIC B4WSC Technical manual - page 12
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4. Water cycle with combination valve
Characteristic heating curve:
With the stationary heating switched on, the heat is
exclusively fed to the passenger compartment =
small cycle, fast heating up.
Once the vehicle engine is put into operation – at low
speed – a part of the heat is fed to the vehicle engine
(partial cycle) which leads to a shortening of the
vehicle engine’s warm-up period.
At increased engine speeds (> 2000 rpm), the entire
heat is distributed to the passenger compartment and
vehicle engine = large cycle, auxiliary heating func-
tion, further shortening of the warm-up period.
Water cycle with combination valve:
5 connections order No. 330 00 177
6 connections order No. 330 00 176
Mounting the combination valve – 5 connections
If the water flow pipe and water return pipe from the
vehicle engine to the heat exchanger in the engine
compartment have been spaced apart, the combina-
tion valve with 5 connections and one T-piece have
to be used.
Mounting the combination valve – 6 connections
If the water flow pipe and water return pipe from the
vehicle engine to the heat exchanger in the engine
compartment have been installed parallel to each
other, the combination valve with 6 connections
(without T-piece) may be used.
Combination valve (6 connections)
HYDRONIC
from vehicle
engine
to vehicle
engine
to vehicle
heat exchanger
from vehicle
heat exchanger
Vehicle engine
HYDRONIC
Vehicle’s heat exchanger
with fan
T-piece
Combination valve
(5 connections)