Install Instructions

Installation & Servicing Instructions Rinnai Q-Series

6.2 Boiler expansion tank

An expansion tank must be part of the central heating system. 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. The expansion

tank is NOT a part of the delivery and should be sourced locally. Please refer to the

expansion tank manufacturer for further information. The Combi boiler Q175C is

equipped with an expansion tank connection. This pipe is connected with the three

way valve and boiler pump.

Fill expansion tank to a minimum of 14.5 psi.

For the boiler to function correctly, it is necessary to connect the expansion

tank to the expansion tank connection on the boiler. If the expansion tank is not

connected to the supplied connection damage to the boiler may occur.

Note:

The solo boilers Q85S, Q130S, Q175S and Q205S can be provided with an optional

internal three way valve. When this valve is installed in the boiler, the boiler is provided

with an expansion tank connection. This pipe is connected with the three way valve

and boiler pump.

For the boiler to function correctly, it is necessary to connect the expansion

tank to the expansion tank connection on the boiler. If the expansion tank is not

connected to the supplied connection damage to the boiler may occur.

See the Rinnai Boiler Applications Manual for further information regarding placement

of the expansion tank in the system. See the Rinnai 3-way valve indirect tank

installation manual for further information regarding the installation of the 3-way valve

indirect tank kit.

The boiler cannot be used with an open type expansion tank.

6.3 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.

NOTICE