Vent System And Air Supply System; Intake / Exhaust Guidelines - Rinnai E75CN Installation & Servicing Instructions Manual

6.7 Vent system and air supply system

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NOTICE
6.7.1
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NOTICE
32
Provisions for combustion and ventilation air must be made in accordance with section,
Air for Combustion and Ventilation of the National Flue Gas Code, ANSI Z223.1,
or Sections 7.2, 7.3 of 7.4 of CAN/CGA B149.1, Installation Codes, or applicable
provisions of the local building codes.
- Do not store chemicals near the boiler or in rooms where the air is being supplied
to the boiler. See the list on page 10.
- Do not allow the fl ue gases of other appliances to enter the boiler.
- Keep cabinet free of moisture
In the event that the system has actuated to shut off the main burner gas,
do not attempt to place the boiler in operation. Contact a qualifi ed service
agency.

Intake / Exhaust Guidelines

Refer to the specifi c instructions on your vent product for additional installation
requirements.
• You must use vent components that are certifi ed and listed with this model.
• Do not combine vent components from different manufacturers.
• Venting should be as direct as possible with a minimum number of pipe fi ttings.
• Avoid dips or sags in horizontal vent runs by installing supports per the vent
manufacturer's instructions.
• Support horizontal vent runs every four feet and all vertical vent runs every six
feet or in accordance with local codes.
• Vent diameter must not be reduced.
• The boiler is unsuitable to install on a common vent installation, see also chapter 19.
• Do not connect the venting system with an existing vent or chimney.
• Do not common vent with the vent pipe of any other water heater or appliance.
• Vent connections must be fi rmly pressed together so that the gaskets form an air
tight seal.
• Refer to the instructions of the vent system manufacturer for component assembly
instructions.
• If the vent system is to be enclosed, it is suggested that the design of the enclosure
shall permit inspection of the vent system. The design of such enclosure shall be
deemed acceptable by the installer or the local inspector.
If it becomes necessary to access an enclosed vent system for service or
repairs, Rinnai is not responsible for any costs or diffi culties in accessing
the vent system. Warranty does not cover obtaining access to an enclosed
vent system.
The instructions for the installations of the venting system shall specifi y that the
horizontal portions of the venting system shall be supported to prevent sagging; the
methods of and intervals for support shall be specifi ed. These instructions shall also
specify that the venting system:
• For category I, II and IV boilers, have horizontal runs sloping upwards not less
than 1/4" per foot (21mm/m) from the boiler to the vent terminal;
• For category III boilers, slope shall be as specifi ed in the boiler manufacturer's
instructions;
• For category II and IV boilers, be installed so as to prevent accumulation of
condensate; and
• For category II and IV boilers, where necessary, have means provided for drainage
of condensate.