Part 7 - Central heating (CH) and Domestic Hot Water (DHW) circuit
Installation examples
The schematics on the following pages are to be seen as guidelines only. They do not display all system
varieties, safety devices or concepts possible. Layouts number 1 and 2 give information on how to
connect the boiler to the CH and/or DHW system. Layouts number 3 till 10 give examples on how to
position the boiler in several system configurations.
Legend
HO Heating Only appliance
IET Internal Expansion Tank
OEET Optional External Expansion Tank
AV Air Vent (Automatic)
FL Filling Loop
PRV Pressure Relief Valve
A CH supply
B Mains water suppl y for filling loo p (Hxxx) types
C Tank supply hot (Hxxx types)
D CH and Tank return (Hxxx types)
A B C D
1) Boiler layout : Ecoking Heating only appliance
Legend
Combi Combi appliance
IET Internal Expansion Tank
OEET Optional External Expansion Tank
AV Air Vent (Automatic)
FL Filling Loop
PRV Pressure Relief Valve
E CH supply
F DHW outlet
G Cold tap water inlet (Cxxx types)
H CH return (Cxxx types)
E F G H
2) Boiler Layout: Ecoking Combi appliance
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