LAARS Mighty Therm2 MT2V (Sizes 500–2000 MBTU/h) - Install and Operating Manual - Manual (Page 11)

Mighty Therm 2
Page 11
Personal injury or DEATH may occur. Natural
snowfall, drifting, and banking should all be taken
into account when locating the terminals in a
potential snow environment.
4. If the Mighty Therm2 is side-wall vented to the
same wall, locate the vent terminal at least 3
feet (0.9m) horizontally from the combustion air
terminal, and locate the vent terminal at least 1
foot (0.3m) above the combustion air terminal ( see
Figure 4 ).
2.3.3 Vertical Vent Terminal
When the unit is vented through the roof, the
vent must extend at least 3 feet (0.9m) above the point
at which it penetrates the roof. It must extend at least
2 feet (0.6m) higher than any portion of a building
within a horizontal distance of 10 feet (3.0m), and high
enough above the roof line to prevent blockage from
snow. When the combustion air is taken from the roof,
the combustion air must terminate at least 12" (30cm)
below the vent terminal ( see Figure 3 ). Seek local
municipalities and their codes for appropriate installation
techniques.
From Massachusetts Rules and Regulations 248 CMR 5.08:
(a) For all side wall horizontally vented gas fueled equip-
ment installed in every dwelling, building or structure
used in whole or inpart for residential purposes, includ-
ing those owned or operated by the Commonwealth and
where the side wall exhaust vent termination is less than
seven (7) feet above finished grade in the area of the
venting, including but not limited to decks and porches,
the following requirements shall be satisfied:
1. INSTALLATION OF CARBON MONOXIDE DETECTORS.
At the time of installation of the side wall horizontal vented
gas fueled equipment, the installing plumber or gasfitter shall
observe that a hard-wired carbon monoxide detector with
an alarm and battery back-up is installed on the floor level
where the gas equipment is to be installed. In addition, the
installing plumber or gasfitter shall observe that a battery op-
erated or hard-wired carbon monoxide detector with an alarm
is installed on each additional level of the dwelling, building
or structure served by the side wall horizontal vented gas
fueled equipment. It shall be the responsibility of the property
owner to secure the services of qualified licensed profes-
sionals for the installation of hard-wired carbon monoxide
detectors.
a. In the event that the side wall horizontally vented gas
fueled equipment is installed in a crawl space or an attic, the
hard-wired carbon monoxide detector with alarm and battery
back-up may be installed on the next adjacent floor level.
b. In the event that the requirements of this subdivision
cannot be met at the time of completion of installation, the
owner shall have a period of thirty (30) days to comply with
the above requirements; provided, however, that during said
thirty (30) day period, a battery operated carbon monoxide
detector with an alarm shall be installed.
2. APPROVED CARBON MONOXIDE DETECTORS. Each
carbon monoxide detector as required in accordance with the
above provisions shall comply with NFPA 720 and be ANSI/
UL 2034 listed and IAS certified.
3. SIGNAGE. A metal or plastic identification plate shall be
permanently mounted to the exterior of the building at a
minimum height of eight (8) feet above grade directly in line
with the exhaust vent terminal for the horizontally vented
gas fueled heating appliance or equipment. The sign shall
read, in print size no less than one-half (½) inch in size,
"GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL
OBSTRUCTIONS".
4. INSPECTION. The state or local gas inspector of the side
wall horizontally vented gas fueled equipment shall not ap-
prove the installation unless, upon inspection, the inspector
observes carbon monoxide detectors and 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 horizontal 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) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT
VENTING SYSTEM PROVIDED. When the manufacturer of
Product Approved side wall horizontally vented gas equip-
ment provides a venting system design or venting system
components with the equipment, the instructions provided
by the manufacturer for installation of the equipment and the
venting system shall include:
1. Detailed instructions for the installation of the venting system
design 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 SYSTEMNOT PROVIDED. When the manufac-
turer of a Product Approved side wall horizontally vented gas
fueled equipment does not provide the parts for venting the
fuel gases, but identifies "special venting systems", the fol-
lowing requirements shall be satisfied by the manufacturer:
1. The identification of each "special venting system" shall
include either the listing of the website, phone number or
manufacturer's address where the venting system installation
instructions can be obtained; and
2. The "special venting systems" shall be Product Approved
by the Board, and the instructions provided with that system
shall include a parts list and detailed installation instructions.
(e) A copy of all installation instructions for the Product
Approved side wall horizontally vented gas fueled equip-
ment, and all the venting instructions, parts lists, and/or
design instructions for the venting system shall remain
with the appliance or equipment at the completion of the
installation.
Manufacturers' websites where venting system installation
instructions may be obtained is located on the Laars website
at: http://www.Laars.com.
2.3.4 Vertical Combustion Air Terminal
When combustion air is taken from the roof, a
field-supplied rain cap or an elbow arrangement must be
used to prevent entry of rain water ( see Figure 3 ). The
opening on the end of the terminal must be at least 12"
(30cm) above the point at which it penetrates the roof,
and high enough above the roof line to prevent blockage
from snow. When the vent terminates on the roof, the
combustion air must terminate at least 12" (30cm) below
the vent terminal.
2.4 Common Vent Test — Boilers
When an existing boiler is removed from a
common venting system, the common venting system is
likely to be too large for proper venting of the appliances