Combustion Air Options - Lochinvar 000 - 2 Installation And Service Manual

Combustion Air Options

CAUTION: Under
should the mechanical room ever be under a
negative pressure.
taken where exhaust fans, attic fans, clothes
dryers, compressors, air handling units, etc.,
take away air from the unit.
1. Outside Combustion Air, No Ducts You can direct
outside combustion air to this unit using either one or two
permanent openings.
One Opening
The opening must have a minimum free area of one square
inch per 3000 Btu input (7cm
opening within 12" (30cm) of the top of the enclosure.
Figure 6 - Outside Combustion Air - Single Opening
Two Openings
The combustion air opening must have a minimum free area of
one square inch per 4000 Btu input (5.5cm
locate this opening within 12" (30cm) of the bottom of the
enclosure.
The ventilation air opening must have a minimum free area of
one square inch per 4000 Btu input (5.5cm
locate this opening within 12" (30cm) of the top of the
enclosure.
no circumstances
Particular care should be
2 per kW). You must locate this
2 per kW). You must
2 per kW). You must
Installation and
Service Manual
Figure 7 - Outside Combustion Air - Two Openings
2. Outside Combustion Air, Using Ducts
You can direct outside combustion air to this unit using two air
ducts to deliver the air to the boiler room.
Each of the two openings must have a minimum free area of
one square inch per 2000 Btu input (11cm
Figure 8 - Outside Combustion Air Through Ducts
3. Combustion Air from Interior Space
You can direct combustion air to this unit using air from an
adjoining interior space. You must provide two openings from
the boiler room to the adjoining room.
Each of the two openings must have a net free area of one
square inch per 1000 Btu input (22cm
than 100 square inches (645cm
9
2 per kW).
2 per kW), but not less
2 ).