Bosch CONDENS 5000W - Page 12

Pre-Installation
Bosch Condens 5000W – 6 720 646 195 (2018/10)
12
Sealed primary system:
NOTICE:
▶ Artificially softened water must not be used to fill the CH system.
• The CH sealed system must be filled using an approved filling loop or
comply with figure 5 for system fill.
• Where the system volume is more than 100 litres or exceeds 265 kPa
at maximum heating temperature, an extra expansion vessel item [2]
figure 6 must be fitted as close as possible to the boiler in the central
heating return.
• Pressurise the extra expansion vessel item [2] figure 6 to the same
value as the expansion vessel built into the boiler.
• Do not use galvanised pipes or radiators.
System fill
Fig. 5 Example of system fill
Additional expansion vessel
Fig. 6 Additional expansion vessel example
Key to figure 6:
[1] Boiler expansion vessel - CH
[2] Extra expansion vessel - CH return
[3] Pressure relief discharge
System layouts
The boiler is equipped with an internal by-pass. The internal bypass is
not intended to be a substitute for an external system bypass.
An external automatic bypass should be used if the system flow can be
significantly adjusted or stopped by zone valves and thermostatic
radiator valves (TRV).
Drain valve
▶ A drain valve should be fitted at the lowest point(s) of the heating
circuit and beneath the appliance.
S Plan layout example
Fig. 7 S Plan
Key to figure 7:
[1] Diverter valve (2 port valve)
[2] Radiator valve (flow)
[3] Lock shield valve (return)
[4] By-pass
Y Plan layout example
Fig. 8 Y Plan
Key to figure 8:
[1] Diverter valve (3 port valve)
[2] Radiator valve (flow)
[3] Lock shield valve (return)
SYSTEM FILL
CV = Check Valve
SV = Stop Valve
SV SV
Test point
Temporary hose
Hose union
CV
CV
Heating
return
Mains
supply
SYSTEM MAKE UP
AA = Auto Air vent
CV = Check Valve
SV
CV
AA
Make up
vessel
Heating
return
1000 mm (39 in)
above the highest
point of the system.
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