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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 standing 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 operation. 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 appliances 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 information will help you insure that adequate fresh air is available for the heater to function properly. Provide For Adequate Ventilation Any space within a home can be classified in the following categories: 1) Unusually Tight Construction 2) Confined Space 3) Unconfined Space First, determine which classification defines the intended 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 atmosphere 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 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 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 passageways 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 considered 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). Radiance Vent-Free Gas Heater 2. Divide the volume of space by 50 cubic feet. The result is the maximum BTU/Hr that the space can support. Example: 3840 divided by 50 = 76.8 or 76,800 BTU/Hr. 3. Add the BTU/Hr ratings of all fuel-burning appliances installed in the same space, including the following: Gas Water Heater Gas Furnace Gas Fireplace Logs Unvented Gas Heater Vented Gas Heater* Other Gas Appliances* * Do not include Direct Vent appliances as these utilize outside air for combustion and vent to the outdoors. Example: Gas Range 55,000 BTU/Hr Unvented Heater +33,000 BTU/Hr Total 88,000 BTU/Hr 4. Compare the maximum BTU/Hr rating the space can support with the total BTU/Hr used by the appliances. Example: 76,800 BTU/Hr - max. the space can support 88,000 BTU/Hr - total used by appliances In this example, the maximum BTU/Hr that the space can support is less than the total used by the appliances, the space is considered to be Confined space. Additional air must be provided to meet the requirem...

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