Procom PCD18T Installationsanleitung PDF herunterladen (Seite 6)

6

Determining if You Have a Conned or Unconned Space

Use this worksheet to determine if you have a conned or unconned space.

Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways or venti-

lation grills between the rooms.

1. Determine the volume of the space

Length×Width×Height= cu.ft. (volume of space)

Example: Space size 20 ft. (length) × 16 ft.(width) × 8 ft. (ceiling height) = 2560 cu. ft. (volume of space)

If additional ventilation to adjoining room is supplied with grills or openings, add the volume of these rooms to the

total volume of the space.

2. Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the space can support.

(volume of space) ÷ 50 cu. ft.= (Maximum Btu/Hr the space can support)

3. Add the Btu/Hr of all fuel burning appliances in the space.

Vent-free heater

Gas water heater*

Gas furnace

Vented gas heater

Gas heater logs

Other gas appliances* +

Total =

*Do not include direct-vent gas appliances. Direct-vent draws combustion air from the outdoors and vents to the outdoors.

4. Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used.

Btu/Hr (maximum the space can support)

Btu/Hr (actual amount of Btu/Hr used)

Example : 51,200 Btu/Hr(maximum the space can support)

71,000 Btu/Hr(actual amount of Btu/Hr used)

The space in the above example is a conned space because the actual Btu/Hr used is more than the maximum Btu/Hr

the space can support. You must provide additional fresh air. Your options are as follows:

a) Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconned space, re-

move door to adjoining room or add ventilation grills between rooms. See “Ventilation Air From Outdoors”, page 7.

b) Vent room directly to the outdoors. See “Ventilation Air From Outdoors”, page 7.

c) Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconned. If the actual Btu/Hr used is less than the

maximum Btu/Hr the space can support, the space is an unconned space. You will need no additional fresh air

ventilation.

WARNING: If the area in which the heater may be operated does not meet the required volume for indoor

combustion air, combustion and ventilation air shall be provided by one of the methods described in the

NATIONAL FUEL GAS CODE, ANSI Z223.1/NFPA 54, the INTERNATIONAL FUEL GAS CODE, or applicable

local codes.

Example:

Gas water heater 40,000 Btu/Hr

Vent-free heater + 31,500 Btu/Hr

Total = 71,500 Btu/Hr

Btu/Hr

b) weather stripping has been added on windows that can be opened 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, electrical, and gas

lines, and at other openings.

If your home meets all of the three criteria above, you must provide additional fresh air. See "Ventilation Air From

Outdoors" (page 6).

If your home does not meet all of the three criteria above, proceed to "Determining Fresh-Air Flow For Heater Location"

(below).

DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION

Procom PCD18T Installationsanleitung Seite 6

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