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signage installed in accordance with the provisions of
248 CMR 5.08(2)(a)1 through 4.
(b) EXEMPTIONS: The following equipment is exempt
from 248 CMR 5.08(2)(a)1 through 4:
1. The equipment listed in Chapter 10 entitled
"Equipment Not Required To Be Vented" in the most
current edition of NFPA 54 as adopted by the Board;
and
2. Product approved side wall horizontally vented gas
fueled equipment installed in a room or structure
separate from the dwelling, building or structure used in
whole or in part for residential purposes.
(c) MANUFACTURERS REQUIREMENTS - GAS
EQUIPMENT VENTING SYSTEM REQUIRED. When
the manufacturer of Product Approved side wall
horizontally mounted gas equipment provides a venting
system design or venting system components with the
equipment,
the
instructions
manufacturer for the installation of the equipment and
the venting shall include:
1. Detailed instructions for the installation of the venting
system or the venting system components: and
2. A complete parts list for the venting system design or
venting system.
(d) MANUFACTURER REQUIREMENTS - GAS
EQUIPMENT VENTING SYSTEM NOT PROVIDED.
When the manufacturer of a product approved side wall
horizontally vented gas fueled equipment does not
provide the parts for the venting of flue gases, but
identifies "special venting systems," the following
requirements shall be satisfied by the manufacturer:
1. The referenced "special venting system" instructions
shall be included with the appliance or equipment
installation instructions; and
2. The "special venting systems" shall be product
approved by the Board, and the instructions for that
system shall include a parts list and detailed installation
instructions.
(e) A copy of all installation instructions for all products
approved side wall horizontally vented gas fueled
equipment, all venting instructions, all parts lists for
venting
instructions,
instructions shall remain with the appliance or
equipment at the completion of the installation.
6 720 608 542
provided
by
and/or
all
venting
design
3.4
Combustion air requirements
Warning: In areas where outside
temperatures commonly fall below
freezing, a twin pipe venting system is
required. Failure to do so may result in
cold outside air being drawn in through
the venting system due to a negative
pressure in the house and across the
heat exchanger coil causing it to freeze
and burst. This failure is not covered
under the manufacturer's warranty.
Warning:
environment where corrosive chemicals
or dirty air are present the twin pipe
system is required.
the
Twin pipe
The GWH 2700 ES is designed as a sealed
combustion appliance. It is recommended that the
combustion air be provided by a dedicated 3" or 4" pipe
from the outside. The combustion air pipe may be PVC
or any other rigid sealed 3" or 4" pipe. The combustion
air piping must pitch down 1/4 inch per foot towards
termination to prevent rain water from entering the
appliance. The combustion air inlet, whether terminating
vertically or horizontally, must be located in such a
manner as to provide a minimum 3 foot clearance
from the exhaust vent terminator. See Fig. 10
Letter I, page 10.
The maximum length of the combustion air inlet
is 26 feet with one elbow. Subtract 2.5 feet for
each additional 90° elbow and 1.25 feet for each
additional 45° elbow. Maximum number of
elbows permitted is 3.
Warning:
prevent
combustion air and exhaust vent piping.
Single pipe
Note: This appliance requires 9950 cubic feet of
available combustion air, or a minimum of 1243
square feet of space with an 8 foot ceiling to
operate. If the large amount of air space, which
equates to about half of most average sized
homes, is not available, the appliance must pull
air from outside (see twin pipe system above).
Although it is permissible to draw combustion air from
inside the structure, it is not the manufacturer's
recommended installation method. Always install a 3
inch elbow on the top of the combustion air inlet
adaptor to prevent foreign objects from falling into the
unit.
If a single pipe installation is utilized, follow guidelines
below for providing adequate combustion air for the
water heater as well as any other appliances that may
Installation instructions
When
installed
in
Vent
terminations
must
rain
from
entering
an
the
15
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