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FLUE REQUIREMENTS - INSTALLATION
The flue must be installed by a competent, authorised person. It is the installer's
responsibility to ensure that the unit has been installed to all current local
requirements.
Ensure that the flue terminal and hot water outlet connection cannot be touched by children.
The flue must be clear of obstructions and shrubbery.
Concentric Flues
The Rinnai Infinity Condensing 32i and HDC1500i are internal units which may only be
installed with the approved Rinnai Infinity and HD flue kit provided. These instructions only
apply to coaxial Rinnai Flues. If in doubt contact Rinnai UK.
The required clearance of the flue terminal is shown on page 30. When multiple units are
installed together there must be enough of a gap to satisfy the requirements of the
regulations. Under current regulations the heaters should have at least a 100mm gap
between them. The flue terminal should be over 2m from ground level whenever possible.
For lower installations a terminal guard cage must be installed.
Flue Length.
Vertical Termination.
If the flue is to terminate vertically the maximum flue length is 9m. At that length three bends
90° are permitted. For an additional 90° bend 2m must be subtracted from the maximum
length (1m for each 45° bend). No more than four 90° bends are permitted.
Horizontal Termination.
The maximum flue total equivalent length is 15m.
2m must be subtracted from the total equivalent length for each 90° bend and 1m for each
45° bend. A maximum of four 90° bends can be used. Regard less off the total equivalent
length the maximum height of the terminal above the water heater is 9m.
Common Header (Cascade) Flues
Do not connect this appliance into any common header flue, cascade system, or natural
draught chimney. For information on these installations contact Rinnai.
Separate instructions are provided with the flue detailing the installation of the flue parts.
It is important that any condensate is kept away from the heat exchanger. The flue should tip
away from the unit without a condensate trap, and towards the unit if there is a trap.
Condensate kits are not required if the flue is directly through the wall behind the unit. For
these installations the terminal should slope gently to the outside to prevent ingress of rain.
Although no condensate is expected in flue runs this short a small amount may occur at start
up on very cold days. Care should be given to the placement of the terminal to prevent risk
from condensation. Condensation water can cause burns, and during winter could create a
slip hazard. It is the responsibility of the installer to decide the best place for the terminal.
Flue pipes must include a condensate drain if the total height exceeds 1.5m. There is a
special condensate drain collector piece available through Rinnai UK. For flue runs requiring
a drain the horizontal sections should slope towards the appliance, and the flue should be
bracketed to prevent sagging. If the flue run is less than 1.5m it should slope gently to the
outside to prevent ingress of rain.
The drain pipe should be run in 22mm PVC, uPVC, or ABS pipe, copper is not
recommended. The drain pipe MUST be trapped.
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