Bosch Worcester 15SBi Installation And Servicing Instructions page 9

Fig. 7. System layout if using twin zone valves (S) plan.
Note:
A drain cock
should be fitted
at the lowest
point of the
heating circuit
and beneath
the appliance
Fig. 8. Filling Loop.
Filling Loop
Filling Key
Fig. 9. Central heating by-pass adjustment
Central Heating
System By-Pass
Adjustment Screw
Use Flat Bladed
Screwdriver to
make adjustment.
LV
RV
RV
LV
RV
RV
Radiator Valve - Flow
Lockshield Valve - Return LV
Filling Knob
LV
APPLIANCE
LV
Refer to fig.1.
Appliance
Water
Flow
Diagram
RV
CH DHW Zone Valve
Zone
Valve
BS
Stop Valve Fixed Cylinder Type
Fig. 8a. Filling Key inserted for filling.
9
INDIRECT
CYLINDER
the SBi system
Safety Discharge
Mains Cold Water
NOTE:
Always remove
the filling key
after filling
IMPORTANT
For Details of
the wiring
requirements
for the system
controls,
please refer to
wiring guide.