Vermont Casting 3358, 3370 Vent Free Features, Fresh Air Requirements for Combustion Ventilation

Vent Free Features

The Radiance RUVSOD, Model Nos. 3357, 3358, 3370 thru 3379, is an unvented gas heating appliance tested and listed to the ANSI standard Z21.11.2-2000. This appliance is specifically configured to burn either Natural Gas or Propane fuel, as indicated on the metal rating plate attached to the rear shroud. The Radiance RUVSOD is not fuel convertible.

The RUVSOD is shipped fully assembled with the ex- ception of the log set. The log set is assembled during installation.

The RUVSOD is equipped with a Honeywell control valve that allows thermostatic control, on/off switch or a remote switch (not supplied).

The RUVSOD model incorporates variable regulators that allow you to adjust burner heat output between HIGH, (35,000 BTU), and LOW, (26,000 BTU). See the Operation Section for details.

A push button Piezo ignitor is used to light the stand- ing pilot. The pilot incorporates an Oxygen Depletion System (ODS/pilot) which will shut off gas flow to the burner in the event that sufficient fresh air becomes unavailable for continued safe operation.

Fresh Air Requirements for Combustion

and Ventilation

WARNING

This heater must have fresh air for proper opera- tion. If not, poor fuel combustion could result. Read the following instructions to insure proper fresh air for this and other fuel-burning appliances in your home.

Modern construction standards have resulted in homes that are highly energy-efficient and that allow little heat loss. Your home needs to breathe, however, and all fuel-burning appliances within it require fresh air in order to function properly and safely. Exhaust fans, clothes dryers, fireplaces, and other fuel burning appli- ances all use the air inside the building. If the available fresh air is insufficient to meet the demands of these appliances, problems can result.

The Radiance Unvented heater has specific fresh air requirements. You must determine that these fresh air requirements will be met within the space where the appliance will be installed. The following informa- tion will help you insure that adequate fresh air is avail- able for the heater to function properly.

Provide For Adequate Ventilation

Any space within a home can be classified in the follow- ing categories:

Radiance Vent-Free Gas Heater

1)Unusually Tight Construction

2)Confined Space

3)Unconfined Space

First, determine which classification defines the intend- ed space.

Unusually Tight Construction

You must provide additional fresh air if the space falls into this classification. Unusually Tight Construction is defined as construction wherein:

a.walls and ceilings exposed to the outside atmo- sphere have a continuous water vapor retarder with a rating of one perm or less with openings gasketed or sealed and

b. weather stripping has been added on openable win- dows 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 penetrations for plumbing, electrical, and

gas lines, and at other openings.

If your home meets all of the three criteria above, you must provide supplemental fresh air for the appliance from outside the home as detailed on page 7, B.

If your home does not meet the above criteria, follow the procedure below.

Determine if You Have a Confined

or Unconfined Space

Use the following formula to determine if you have a confined or unconfined space.

Space is defined as the room in which you will install the heater plus any adjoining rooms with doorless pas- sageways or ventilation grilles between the rooms.

The National Fuel Gas Code defines a confined space as a space whose volume is less than 50 cubic feet per 1,000 BTU per hour, (4.8 m3 per kw), of the aggregate input rating of all appliances installed in that space and an unconfined space as a space whose volume is not less than 50 cubic feet per 1,000 BTU per hour, (4.8 m3 per kw), of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space in which the appliances are installed, through openings not furnished with doors, are consid- ered a part of the unconfined space.

1.Determine the volume of space, (length x width x

height). Include adjoining rooms connected by doorless passageways or ventilating grilles.

Example:

A room that is 18’ x 12’ x 8’ has a volume of 1728 cubic feet, ( length x width x height). An adjoining open kitchen that is 10’ x 12’ x 8’ has a volume of 960 cubic feet. An adjoining open dining room is 12’ x 12’ x 8’ with a volume of 1152 cubic feet. The total space volume is 3840 cubic feet. (1728 + 960 + 1152).

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