Vermont Castings UVS27
Vent Free Features
The UVS27, Model Nos. 3030 thru 3033, is an unvented gas heating appliance tested and listed to the ANSI standard
The firebox is shipped fully assembled and ready for installation with either the Stardance (SUV) or the Pinnacle (PUV) shell assemblies.
The firebox assembly is composed of the NG or LP Burner, a base plalte, firebox and screen. The log set, burner tube, gas valve and pilot comprise the Burner assembly. (Fig. 1)
The UVS27M is equipped with an SIT control for manual use only.
The UVS27R is equipped with a Honeywell control valve that allows thermostatic control, on/off switch or a remote switch (not supplied).
Both models incorporate variable regulators that allow you to adjust burner heat output between HIGH, (28,000 BTU), and LOW, (19,500 BTU). See the Operation Section for details.
The standing pilot incorporates an Oxygen Depletion System (ODS/pilot) designed to shut off the appliance if enough fresh air is not available.
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
Modern construction standards have resulted in homes that are highly
The UVS27R/M 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 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
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 appli- ances 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.
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