Dyna-Glo GUH50NE/LE Operating Instructions And Owner's Manual page 8

INDUCED DRAFT BLOWER
CATEGORY III VENT ACCORDING TO THESE INSTALLATION INSTRUCTIONS.
SLOPE: +¼ INCH FOR 1 FOOT RUN MINIMUM (1mm per 50mm)
NOTE - MINIMUM HORIZONTAL LENGTH 3FT. (1.5M)
NOT INCLUDING TERMINATION
MAXIMUM HORIZONTAL LENGTH AND NUMBER OF ELBOWS REFER TO TABLE 2
COMMON VENTING NOT ALLOWED WHEN HORIZONTALLY VENTING THE UNIT / UTILITY HEATER
F - VENTING USING A MASONRY CHIMNEY
The following additional requirements apply when a lined
masonry chimney is being used to vent the compact unit /
utility heater.
1. Masonry chimneys used to vent Category I units
heaters must be either tile-lined or lined with a listed
metal lining system or dedicated gas vent. Unlined
masonry chimneys are prohibited. A category I
appliance must never be connected to a chimney
that is servicing a solid fuel appliance. If a fireplace
chimney flue is used to vent this appliance, the
fireplace opening must be permanently sealed.
2. A fan assisted unit heater may be commonly vented
into an existing lined masonry chimney provided:
• The chimney is currently serving at least one draft-
hood equipped appliance.
• The vent connector and chimney are sized in
accordance with venting tables in the (American)
National Fuel Gas Code ANSI Z223.1 or (Canada) CSA
B149.1 Natural Gas and Propane Installation Code.
IMPORTANT Single appliance venting of a fan assisted
unit heater into a tile lined masonry chimney (interior or
outside wall) is prohibited. The chimney must first be lined
with either type B-1 vent or an insulated single wall flexible
vent lining system, sized in accordance with venting
tables in the (American) National Fuel Gas Code ANSI
Z223.1 or (Canada) CSA B149.1 Natural Gas and Propane
Installation Code.
3. A type B-1 vent or masonry chimney liner shall
terminate above the roof surface with a listed cap or a
listed roof assembly in accordance with the terms of
their respective listings and the vent manufacturer's
instructions.
4. Do not install a manual damper, barometric draft
regulator, or flue restrictor between the unit heater and
the chimney.
5. If type B-1 double-wall vent is used inside a chimney,
no other appliance can be vented into the chimney.
Outer wall of type B-1 vent pipe must not be exposed
to flue products.
8
GAS UNIT HEATER
HORIZONTAL VENTING - RESIDENTIAL INSTALLATION
FLUE TRANSITION
LISTED THIMBLE THROUGH
UPWARD SLOPE
(PROVIDED)
COMBUSTION WALL
6. Insulation for the flexible vent pipe must be an
encapsulated fiberglass sleeve recommended by the
flexible vent pipe manufacturer.
7. The space between liner and chimney wall should
NOT be insulated with puffed mica or any other loose
granular insulating material.
8. If type B-1 vent or an insulated flexible vent pipe cannot
be used as liners, the chimney must be rebuilt to
accommodate one of these methods or some alternate
approved method must be found to vent the appliance.
When inspection reveals that an existing chimney is
not safe for the intended purpose, it shall be rebuilt to
conform to nationally recognized standards, lined or
relined with suitable materials or replaced with a gas
vent or chimney suitable for venting unit heaters. The
chimney passageway must be checked periodically to
ensure that it is clear and free of obstructions.
G - REMOVAL OF UNIT FROM COMMON VENT
In the event that an existing unit heater is removed
from a venting system commonly run with separate gas
appliances, the venting system is likely to be too large
to properly vent the remaining attached appliances. The
following test should be conducted while each appliance is
in operation and the other appliances are not in operation,
yet remain connected to the common venting system.
If the venting system has been installed improperly, the
system must be corrected.
1. Seal any unused openings in the common venting
system.
2. Inspect the venting system for proper size and
horizontal pitch as required in the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, or the Natural Gas
and Propane Installation Code, CSA B149.1, and
these instructions. Verify that there is no blockage or
restriction, leakage, corrosion and/or other deficiencies
that could cause an unsafe condition.
3. If practical close all building doors and windows and
18 INCHES MIN
(45.7 CM)
VENT TERMINATION
(See tables 4 and 5)
TEE TERMINATION SHOULD BE
HORIZONTAL FOR THE OUTLETS
FIGURE 5