Boiler Expansion Tank; Underfl Oor Heating System (Plastic Pipes) - Rinnai Q Premier QP85N Installation & Servicing Instructions Manual

6.2
i
NOTICE
i
NOTICE
i
NOTICE
6.3
i
NOTICE
26

Boiler expansion tank

An expansion tank is part of the boiler for the closed loop heating system only. The
expansion tank has a content of 3.17 gallons / 12 liters and a pre-charge pressure of
14.5 psi / 1 bar. Depending on the size of the installation the expansion tank must be
appropriate to the water content of the installation. The pre-charge pressure depends
on the installation height above the mounted expansion tank. When necessary
installing an additonal expansion tank is possible to get to the appropiate summary
of the expansion volume. The additional expansion tank is NOT a part of the delivery
and should be sourced locally. Please refer to the expansion tank manufacturer for
further information.
Fill the additional expansion tank to a minimum of 14.5 psi.
For the boiler to function correctly, it is necessary to connect the additional
expansion tank to the installation according to fi gure 7.
See the Rinnai Boiler Applications Manual for further information regarding placement
of the expansion tank in the system.
The boiler cannot be used with an open type expansion tank.
Underfl oor heating system (plastic pipes)
When using oxygen-permeable pipes, e. g. for fl oor heating systems, you must
separate the system using plate heat exchangers.
No recourse can be made to the terms of the limited warranty in the event of
failure to observe the regulations pertaining to plastic underfl oor heating pipes.