Keystone KW 399 399

Page 16
zontally vented gas fueled equipment. It shall be the
responsibility of the property owner to secure the
services of qualified licensed professionals for in-
stallation 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 subdivi-
sion 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 DI-
RECTLY 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.
3.4 Common Vent Test
NOTE: This section does not describe a method for
common venting Keystone units. It describes what must
be done when a unit is removed from a common vent
system. Keystone units require special vent systems
and fans for common vent. Contact the factory if you
have questions about common venting Keystone units.
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.
Figure 12. Multiple Side-Wall Terminals, Air and Vent.
Figure 13. Minimum Venting Distance.
399-850