Sanitary Expansion Vessel - Baxi UB 80 INOX Technical Manual

ATTENTION:
For some models of boiler
the NTC DHW probe must be
replaced (see table)
Figure 4: Connecting the NTC DHW priority probe
(optional accessory)
If:
• the pressure of the water supply or lifting system is such as to require the installation of a pressure reducer (pressure
higher than 4 bar);
• a non-return valve is fitted on the water supply line;
• the cold water network is too small to allow the water in the storage boiler to expand;
the DHW circuit safety valve trips and causes the water to leak.
To eliminate this problem, install an expansion vessel on the DHW circuit. The recirculator connector F on the storage
boiler can be used for this purpose.
Sanitary expansion vessel available as optional accessory.
To install this accessory proceed as follow:
• Remove above cover pulling up on its rear part (fixed through clamping device)
• Drain the tank as described at §4.
• Place the expansion vessel on the rear seat present on the insulation and fix it on the connection support with two self-
tapping screw.
• Remove the G 3/4" plug of the recirculation connection and insert the "T" fitting connection.
• Connect the flexible pipe with the "T" fitting connection.
INSTRUCTIONS FOR FITTERS

7. SANITARY EXPANSION VESSEL

BOILER
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7225973. 01 - en