User Manual

RECON Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
OMM-0103_0A AERCO International, Inc.  100 Oritani Dr.  Blauvelt, NY 10913 Page 37 of 178
GF-147 Phone: [phone] PRI: 10/28/2014
The more common methods of combustion air supply are outlined in the following sections. For
combustion air supply from ducting, consult the Innovation and RECON Venting and
Combustion Air Guide, GF-5050.
2.14.1 Combustion From Outside the Building
Air supplied from outside the building must be provided through two permanent openings. For
each unit these two openings must have a free area of not less than one square inch for each
4000 BTUs input of the equipment or 250 square inches of free area. The free area must
take into account restrictions such as louvers and bird screens. For Canada installations, refer
to the requirements specified in CSA B149.1-10, 8.4.1 and 8.4.3.
2.14.2 Combustion Air from Inside the Building
When combustion air is provided from within the building, it must be supplied through two
permanent openings in an interior wall. Each opening must have a free area of not less than
one square inch per 1000 BTUH of total input or 1000 square inches of free area. The free
area must take into account any restrictions, such as louvers.
2.15 DUCTED COMBUSTION
The AERCO RECON Water Heater is UL listed for 100%-ducted combustion. For ducted
combustion installations, the screen inlet air ductwork must then be attached directly to the
unit’s air inlet.
In a ducted combustion air application, the combustion air ducting pressure losses must be
taken into account when calculating the total maximum allowable venting run. See the
Innovation and RECON Venting and Combustion Air Guide, GF-5050. When using the heater
in a ducted combustion air configuration, each unit must have a minimum 6 inch diameter
connection at the unit.