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2.6.2 GAS CONNECTION
IMPORTANT
Before connecting the appliance to the gas mains, in order not to invalidate the warranty, it is
necessary to clean the pipe and remove any impurities or production residues that could cause
the product to malfunction.
Make sure that the appliance is set up for the correct type of gas.
The gas connection is: 15A (R1/2”) male type.
Check that the gas meter and the gas pipes are adequate to the power of the appliance (and of all the appliances
connected to the same gas line): the gas network must be designed by qualified professionals and according to current
regulations and must provide adequate dynamic pressure based on the rated power of the device. Refer to what
reported by the UNI 7129.
Insufficient gas supply may cause premature damage to the appliance.
The gas supply pressure directly affects the delivered power and can cause problems if it is not correct. If the
dimensioning of the gas piping is insufficient, the customer will not be able to enjoy the maximum benefit in terms of
performance.
When connecting the gas piping, it is recommended to have an interception ball valve for emergency situations and to
facilitate maintenance; do not connect the valve directly to the boiler, but interpose a flexible connection joint.
Fuel quality: the appliance is designed to work with combustible gas without impurities. If this is not the case, an
adequate filtration system should be installed upstream of the appliance, in order to restore the necessary quality.
LPG tanks: inert gas residues (e.g. nitrogen, etc…) could remain inside new tanks resulting in a poor gas mixture and
could cause incorrect operation or product failure. The gases in the mixture could stratify during storage, causing the
variation of the fuel calorific value and altering the appliance efficiency.
2.6.3 FLUE SySTEm CONNECTION
IMPORTANT
The exhaust system operates under positive pressure: it must be carried out by competent
personnel, qualified according to the law, following the manufacturer’s instructions and respecting
the provisions of the law and the technical regulations in force.
The type of the flue system must be listed into the classes mentionned on the data plate (located
on the side of the appliance). Rinnai provides a specific flue system for the appliance. Detailed
installation instructions are supplied with the flue elements. For more information contact Rinnai.
Zen boilers must be installed by always connecting a Rinnai homologated exhaust system: they
can not be used without having installed the exhaust system. The exhaust system is considered
an integral part of the appliance: it is only possible to install certified and tested exhaust systems
in combination with the appliance.
Before proceeding with the installation of the flue system, it is necessary to carefully check that
each component is not damaged: install the component only if free from defects. Use of faulty or
damaged components and improper installation can cause serious damage to people or property.
Make sure that the flue terminal is not obstructed or blocked.
Coaxial flue system
In the upper part of the appliance there is a coaxial connection (Ø60 / 100mm) for the intake of combustion air (external
pipe) and for the expulsion of combustion products (inner pipe) with a socket for combustion analysis.
It is possible to install the flue system by connecting the specific flue accessories to the predisposed connection: the
flue system (coaxial extensions and curves) must have a diameter not inferior to the initial connection, be made of
materials suitable for the appliance flue temperatures and have ‘male / female’ watertight seal. Traits exposed to direct
sunlight must be homologated for such use or be adequately protected.
Using a Ø60/100mm coaxial exhaust system, the maximum equivalent length allowed is 30m. It is necessary to
subtract 2.0m for each 90° bend used and 1.0m for each 45° bend from the maximum equivalent length.
Beyond the 12m the boiler power is progressively reduced depending on the equivalent length of the exhaust system.
The maximum number of 90° bends is three (six for 45° bend).
It is allowed the use of any possible combination of curves and extensions that respects the maximum equivalent
length and the maximum number of bends for each section.
