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Vermont Castings UVS27 Vent-Free Gas Heater
20005004
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 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.
Vent Free Features
The UVS27, Model Nos. 3030 thru 3033, is an
unvented gas heating appliance tested and listed to
the ANSI standard Z21.11.2a-2001. 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 UVS27 is not fuel
convertible.
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.
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.
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
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 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.