2 Owner manual

Installation & Operation Manual
1 Determine pool heater location (continued)
11
Combustion air requirements are based on the latest edition of
the National Fuel Gas Code, ANSI Z223.1, in Canada
CAN/CGA-B149 Installation Code for Gas Burning Appliances
and Equipment. Check all local code requirements for
combustion air.
All dimensions are based on net free area in square inches.
Metal louvers or screens reduce the free area of a combustion
air opening a minimum of approximately 25%. Check with
louver manufacturers for exact net free area of louvers. Where
two openings are provided, one must be within 12" of the
ceiling and one must be within 12" of the floor of the
equipment room. Each opening must have net free area as
specified in Table 1B. Single openings shall be installed within
12" of the ceiling.
 CAUTION
Under no circumstances should the
equipment room ever be under a negative
pressure. Particular care should be taken
where exhaust fans, attic fans, clothes
dryers, compressors, air handling units, etc.,
may take away air from the unit.
The combustion air supply must be
completely free of any flammable vapors
that may ignite or chemical fumes which
may be corrosive to the pool heater.
Common corrosive chemical fumes which
must be avoided are fluorocarbons and
other halogenated compounds, most
commonly present as refrigerants or
solvents, such as Freon, trichlorethylene,
perchlorethylene, chlorine, etc. These
chemicals, when burned, form acids which
attack the heat exchanger finned tubes,
headers, flue collectors, and the vent system.
The result is improper combustion and a
non-warrantable, premature pool heater
failure.
EXHAUST FANS: Any fan or equipment which exhausts air
from the equipment room may deplete the combustion air
supply and/or cause a downdraft in the venting system.
Spillage of flue products from the venting system into an
occupied living space can cause a very hazardous condition
that must be immediately corrected. If a fan is used to supply
combustion air to the equipment room, the installer must
make sure that it does not cause drafts which could lead to
nuisance operational problems with the pool heater.
DirectAire Vertical, DirectAire Horizontal and E-Rite
Venting systems have specific requirements for combustion
air ducts from the outside which are directly connected to
the pool heater. See the requirements for this combustion air
duct in the Venting section for each specialized vent system.
TABLE - 1B
MINIMUM RECOMMENDED COMBUSTION
AIR SUPPLY TO EQUIPMENT ROOM
Model
Number
Outside Air from
2 Openings Directly from
Outdoors
Outside Air from
1 Opening Directly
from Outdoors, in
2
Inside Air from
2 Ducts Delivered from
Outdoors
Inside Air from
2 Ducts Delivered from
Interior Space
To p
Opening, in
2
Bottom
Opening, in
2
To p
Opening, in
2
Bottom
Opening, in
2
To p
Opening, in
2
Bottom
Opening, in
2
ER152 38 38 50 75 75 150 150
ER202 50 50 67 100 100 200 200
ER252 63 63 83 125 125 250 250
ER302 75 75 100 150 150 300 300
ER402 100 100 133 200 200 400 400