Lochinvar EnergyRite ER202 Installation & Operation Manual page 11

1
Determine pool heater location
Outside Air from
2 Openings Directly from
Model
Outdoors
Number
Top
Opening, in 2 Opening, in
ER152 38
ER202 50
ER252 63
ER302 75
ER402 100
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.
Under no circumstances should the
⚠ CAUTION
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.
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.
TABLE - 1B
MINIMUM RECOMMENDED COMBUSTION
AIR SUPPLY TO EQUIPMENT ROOM
Outside Air from
1 Opening Directly
from Outdoors, in
Bottom
2
38 50
50 67
63 83
75 100
100 133
(continued)
Inside Air from
2 Ducts Delivered from
Outdoors
2
Top Bottom
Opening, in 2 Opening, in
75
100 100
125 125
150 150
200 200
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.
These
Installation & Operation Manual
Inside Air from
2 Ducts Delivered from
Interior Space
Top
2 Opening, in 2 Opening, in
75 150
200
250
300
400
Bottom
2
150
200
250
300
400
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