4
Unusually tight construction is defined as con- struction where:
a. wall and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating or one perm or less with openings gasketed or sealed, and
b. weather stripping has been added on oper- able windows and doors, and
c. caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and floors, between wall- ceiling joints, between wall panels, at penetra- tions for plumbing, electrical, and gas lines, and at other openings.
Use the following equations to determine if you have a confined or unconfined space.
1.Determine the volume of space — ft 3.
Length x Width x Height = _____ ft 3
(Include adjoining rooms with doorless pas- sageways or ventilation grills between rooms.)
Example: 24' (L) x 16' (W) x 8' (H) = 3072 ft 3
2.Divide the volume of space by 50 ft 3 to determine the maximum BTU/Hr the space can support.
______ (volume of space – ft 3)/ 50 ft 3 = (Maximum BTU/Hr the space can support)
Example: 3072 ft 3 / 50 ft 3 = 61.44
or 61,440 BTU/Hr the space can support.
3.Add the BTU/Hr of all the fuel burning appli- ances in the space.
_______ | BTU/Hr | |
Gas appliance #1* | _______ | BTU/Hr |
Gas appliance #2 | + _______ | BTU/Hr |
Total = _______ | BTU/Hr | |
Example: |
|
|
VF6000 | BTU/Hr | |
Gas appliance #1 | 34,000 | BTU/Hr |
(water heater) |
|
|
Total = 66,000 | BTU/Hr | |
*Do not include
4. Compare the maximum BTU/Hr the space can support with the actual amount of BTU/ Hr used.
_________ | BTU/Hr |
| (max. the space can support) |
_________ | BTU/Hr |
| (actual amount of BTU/Hr used) |
Example: |
|
61,440 | BTU/Hr |
| (max. the space can support) |
66,000 | BTU/Hr |
| (actual amount of BTU/Hr used) |
The space in the above example is a confined space because the actual BTU/Hr used is more than the maximum BTU/Hr the space can sup- port. You must provide additional fresh air.
WARNING: IF THE AREA IN WHICH THE HEATER MAY BE OPERATED IS SMALLER THAN THAT DEFINED AS AN UNCON- FINED SPACE, PROVIDE ADEQUATE COMBUSTION AND VENTILATION AIR BY ONE OF THE METHODS DESCRIBED IN THE NATIONAL FUEL GAS CODE, ANSI Z223.1 1992, SECTION 5.3 OR APPLI-
CABLE LOCAL CODES.
Your options are:
a. Rework equations adding the space of ad- joining room(s). If the extra volume provides an unconfined space, then remove door or add ventilation grills between rooms. Refer to National Fuel Gas Code, ANSI Z223.1 1992, Section 5.3.
b. Vent room directly to the outdoors. Refer to National Fuel Gas Code, ANSI Z223.1 1992, Section 5.3.
c. Install a lower BTU/Hr heater, such as the 25,000 BTU/Hr, to make the area an uncon- fined space.
If the actual BTU/Hr used is less than the maximum BTU/Hr the space can support, then the space is an unconfined space. You will need no additional fresh air ventilation for an uncon- fined space.
NOTE: DIAGRAMS & ILLUSTRATION NOT TO SCALE.
LOCATION OF FIREPLACE
Carefully select the best location for installation of your VF5000 and VF6000 series Unvented Room Heater. The following factors should be taken into consideration:
•Clearance to side wall, ceiling, woodwork and windows.
•Location must not be affected by drafts caused by kitchen exhaust fans, return air reg- isters for forced air furnaces/air conditioners, windows or doors.
•Installation must provide adequate ventila- tion and combustion air.
•Do not install the VF5000 and VF6000 series heaters in a sleeping room or bathroom.
•Never obstruct the front opening of the heater or restrict the flow of combustion and ventilation air.
•This appliance may be installed in an after- market manufactured (Mobile) Home, where not prohibited by state or local codes.
*Aftermarket: Completion of sale, not for pur- pose of resale, from the manufacturer.
•Minimize modifications to existing construc- tion. Refer to Figure 1 for location suggestions.
Figure 1
To ensure even heat distribution, it is best to position the heater centrally against the long- est wall of the room. Make sure there is ad- equate ventilation where the heater is installed. The gas appliance will shut off if the oxygen level falls below 18.0%.
These appliances are uniquely suited for in- stallations requiring a utility shelf positioned directly above the fireplace. Utility shelves like these are commonly used for locating televi- sion sets and decorative plants.
