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UVS27 Vent-Free Gas Heater
20007068
Provide For Adequate Ventilation
Any space within a home can be classified in the follow-
ing categories:
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 ANSIZ223.1/NFPA54
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 appli-
ances 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 ag-
gregate 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.
Vent Free Features
The UVS27, Models 4030, 4036. 4040, 4046, 4085,
4090, is an unvented gas heating appliance tested and
listed to the ANSI standard Z21.11.2b-2004. This ap-
pliance is specifically configured to burn either Natural
Gas or Propane fuel, as indicated on the metal rating
plate attached to the rear shroud. The UVS27 is not fuel
convertible.
The stove is shipped fully assembled and ready for
installation.
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 al-
low you to adjust burner heat output between HIGH,
(28,000 BTU), and LOW, (19,500 BTU). See the Opera-
tion 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.
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.
Fresh Air Requirements for Combustion
and Ventilation
WARNING
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 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 avail-
able for the heater to function properly.