Procom MD100TBA Installation Manual download pdf (Page 7)

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7200000-01B

Water vapor is a by-product of gas combus-

tion. An unvented room heater produces ap-

proximately one (1) ounce (30 mL) of water for

every 1,000 BTUs (0.3 KWs) of gas input per

hour. Unvented room heaters are recommended

as supplemental heat (a room) rather than a

primary heat source (an entire house). In most

supplemental heat applications, the water vapor

does not create a problem. In most applications,

the water vapor enhances the low humidity

atmosphere experienced during cold weather.

The following steps will help ensure that water

vapor does not become a problem.

1. Be sure the heater is sized properly for the

application, including ample combustion

air and circulation air.

2. If high humidity is experienced, a dehu-

midier may be used to help lower the

water vapor content of the air.

3. Do not use an unvented room heater as

the primary heat source.

AIR FOR COMBUSTION AND VENTILATION

WARNING: This heater shall

not be installed in a conned space

or unusually tight construction

unless provisions are provided

for adequate combustion and

ventilation air. Read the following

instructions to insure proper fresh

air for this and other fuel-burning

appliances in your home.

Today’s homes are built more energy efcient

than ever. New materials, increased insulation

and new construction methods help reduce

The following are excerpts from National Fuel

Gas Code, ANSI Z223.1/NFPA 54, Air for

Combustion and Ventilation.

All spaces in homes fall into one of the three

following ventilation classications:

WATER VAPOR: A BY-PRODUCT OF

UNVENTED ROOM HEATERS

heat loss in homes. Home owners weather

strip and caulk around windows and doors

to keep the cold air out and the warm air in.

During heating months, home owners want

their homes as airtight as possible.

While it is good to make your home energy

efcient, your home needs to breathe. Fresh

air must enter your home. All fuel-burning ap-

pliances need fresh air for proper combustion

and ventilation.

Exhaust fans, replaces, clothes dryers and

fuel burning appliances draw air from the house

to operate. You must provide adequate fresh

air for these appliances. This will insure proper

venting of vented fuel-burning appliances.

PROVIDING ADEQUATE VENTILATION

1. Unusually Tight Construction

2. Unconned Space

3. Conned Space

The information on pages 7 through 9 will help

you classify your space and provide adequate

ventilation.

Unusually Tight Construction

The air that leaks around doors and windows may

provide enough fresh air for combustion and ven-

tilation. However, in buildings of unusually tight

construction, you must provide additional fresh air.

Unusually tight construction is dened as

construction where:

a. walls and ceilings exposed to the outside

atmosphere have a continuous water

vapor retarder with a rating of one perm

(6 x 10

-11

kg per pa-sec-m

) or less with

openings gasketed or sealed and

b. weather stripping has been added on

openable windows and doors and

c. caulking or sealants are applied to areas

such as joints around window and door

frames, between sole plates and oors,

between wall-ceiling joints, between wall

panels, at penetrations for plumbing, electri-

cal and gas lines and at other openings.

If your home meets all of these three criteria,

you must provide additional fresh air. See

Ventilation Air From Outdoors, page 9.

If your home does not meet all of the three

criteria above, proceed to Determining Fresh-

Air Flow For Heater Location, page 8.

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Procom MD100TBA Installation Manual Page 7

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