Installation Guide

Rinnai Tankless Water Heater Installation and Operation Manual 43
To prevent possible personal injury or death due to asphyxiation, common venting with other
manufacturer’s induced draft appliances is not allowed.
WARNING
Louvers and Grills
Adequate air is required for all gas utilizing equipment in the location. Therefore, proper sizing of
permanent openings, such as louvers or grills, must be considered to maintain the required free
area. If the free area of the louver or grill design is not available, assume wood louvers will have
25% free area and metal louvers or grills will have 75% free area. Under no circumstance should the
louver, grill or screen have openings smaller than 1/4 in.
Example for a grill with dimensions as shown in Figure 33:
Wood: 10 in. x 12 in. x 0.25 = 30 in.2
Metal: 10 in. x 12 in. x 0.75 = 90 in.2
12 in.
(300 mm)
10 in.
(250 mm)
Location
To maintain proper circulation of air, two permanent
openings (one upper, one lower) must be positioned
in confined spaces. The upper shall be within 12 in.
(0.30 m) of the top of the confined space and the
lower opening shall be within 12 in. (0.30 m) of the
bottom of the confined space. Openings must be
positioned as to never be obstructed.
Combustion air provided to the appliance should not
be taken from any area of the structure that may
produce a negative pressure (i.e. exhaust fans,
powered ventilation fans).
Checklist for Intake Air and Venting Requirements
□
Verify all combustion air opening sizes are correct.
□
Ensure that the combustion air requirements are followed that will provide sufficient
combustion air for the appliance.
□
DO NOT use room air for combustion in applications where the indoor air is corrosive.
□
Verify that adequate combustion air is available for all appliances installed in the space.
□
Installation complies with National Fuel Gas Code, ANSI Z223.1/NFPA 54 as well as local and
state regulations therein.
Figure 33