LAARS Heating Systems
Page 18
Figure 8. Combustion Air and Vent Through Roof
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In Canada, refer to CAN/CSA
B149.1
(Place in section 3.1)
Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000
Screen for horizontal galvanized air pipe
D2012104
D2012101
D2012101
D2012102
D2012103
D2012103
Screen for horizontal PVC air pipe
CA012004
CA012001
CA012001
CA012002
CA012003
CA012003
Screen for horizontal polypropylene air pipe
CA012204
CA012201
CA012201
CA012202
CA012203
CA012203
Screen for vertical galvanized air pipe
D2012204
D2012201
D2012201
D2012202
D2012203
D2012203
Screen for vertical PVC air pipe
CA012404
CA012401
CA012401
CA012402
CA012403
CA012403
Screen for vertical polypropylene air pipe
CA012604
CA012601
CA012601
CA012602
CA012603
CA012603
Table 3a - Ducted Air Accessories
(Place in section 3.2)
Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000
Horizontal vent terminal for stainless steel
D2012004
D2012001
D2012001
D2012002
D2012003
D2012003
Screen for horizontal CPVC vent
CA012104
CA012101
CA012101
CA012102
CA012103
CA012103
Screen for vertical stainless steel vent
D2012304
D2012301
D2012301
D2012302
D2012303
D2012303
Screen for vertical CPVC vent
CA012504
CA012501
CA012501
CA012502
CA012503
CA012503
Table 3* - Vent Accessories
(Place in section 3.5)
Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000
Air intake screen for unit placed outdoors
CA0011904
CA011901
CA011901
CA011902 CA0011903 CA0011903
Vent terminal for unit placed outdoors
CA011803
CA011801
CA011801
CA011802
CA011803
CA011803
Table 3** - Air & Vent Accessories for Units Placed Outdoors
Table 11. Air & Vent Accessories for units placed outdoors
3.F Common Vent Test
NOTE: This section does not describe a method
for common venting this unit. It describes what
must be done when an appliance is removed
from a common vent system. This category IV
unit requires special vent systems and fans for
common vent. Contact the factory or your factory
representative if you have questions about
common venting this category IV unit.
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
remaining connected to it.
At the time of removal of an existing boiler, the following
steps shall be followed with each appliance remaining
connected to the common venting system placed in
operation, while the other appliances remaining connected
to the common venting system are not in operation.
1. Seal any unused openings in the common venting
system.
2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage
or restriction, leakage, corrosion or other deficiencies
which could cause an unsafe condition.
At the time of installation of the side wall vented
gas fueled appliance, the installing plumber
or gas-fitter shall observe that a hard-wired
carbon monoxide detector with an alarm battery
back-up is installed on the floor level where
the gas appliance is to be installed. In addition,
the installing plumber or gasfitter shall observe
that a battery operated 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 horizontally
vented gas fueled equipment. It shall be the
responsibility of the property owner to secure
the services of qualified licensed professionals
for 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 with alarm and battery back-up may
be installed on the next adjacent floor level.
b. In the event that the requirements of the
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 be installed.
2.
Approved Carbon Monoxide Detectors
Each carbon monoxide detector 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 horizontally vented gas fueled
heating appliance or equipment. The sign shall
read, in print no less than one-half (1/2) 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 appliance shall not
approve 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) 1-4.
