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4.2.3 Installation for return boost function
The "return boost" function for heating system boosting in a solar heating system, requires a valve that
directs the flow either through the reserve cylinder or directly back to the boiler depending on the
return temperature.
1
6720613626.02-1.SD
Fig. 8
Valve for return boost
1
Combination cylinder
2
TDS 300 solar heating programmer
HR
Heating system return
KR
Boiler return
DWU Motorised 3-way diverter valve
B Fit 3-way motorised valve in return pipe between reserve cylinder or combination cylinder (
Item 1) and boiler according to the table below.
Mark
I
II
III
Tab. 4
Connection markings on valve.
2
DWU
HR
I I
I
I I I
Connection
From heating system (return)
To cylinder
To boiler
6 720 644 593 (2010/04)
INSTALLATION (FOR ENGINEERS ONLY)
KR
Fig. 8,
15
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