Venting - Lochinvar LTN07575 Instruction Manual

FIGURE 15. AIR FROM INDOOR SPACES
Each opening shall communicate directly with an
additional room(s) of sufficient volume so that the
combined volume of all spaces meets the criteria for an
unconfined space.
Each opening shall have a minimum free area of 1
square inch per 1,000 Btu/hr (2200 mm
aggregate input rating of all appliances installed in the
enclosure. Each opening shall not be less than 100
square inches (645 cm ).
2

VENTING

Water heaters covered by these instructions are Category
I, Natural Draft appliances.
Chemical vapor corrosion of the flue and vent system
may occur if air for combustion contains certain chemical
vapors. Spray can propellants, cleaning solvents,
refrigerator and air conditioner refrigerants, swimming
pool chemicals, calcium and sodium chloride, waxes,
bleach and process chemicals are typical compounds
which are potentially corrosive.
VENT DAMPERS - Any vent damper, whether it is
operated thermally or otherwise must be removed if its
use inhibits proper drafting of the water heater.
Thermally Operated Vent Dampers: this gas-fired water
heater has a thermal efficiency at or above 80% which
may produce a relatively low flue gas temperature.
Such temperatures may not be high enough to properly
open thermally operated vent dampers. This would
cause spillage of the flue gases and may cause carbon
monoxide poisoning. Vent dampers must bear evidence
of certification as complying with the current edition of
the
(covering electrically and mechanically actuated vent
dampers). Before installation of any vent damper, consult
the local gas utility for further information.
To insure proper venting of this gas-fired water heater,
the correct vent pipe diameter must be utilized. Any
additions or deletions of other gas appliances on a
common vent with this water heater may adversely affect
the operation of the water heater. Consult your gas
supplier if any such changes are planned.
For proper venting in certain installations, a larger
diameter vent pipe may be necessary. Consult your gas
supplier to aid you in determining the proper venting
for your water heater from the vent tables in the current
edition of the
.
54
Periodically check the venting system for signs of
obstruction or deterioration and replace if needed.
per kW) of the
2
The combustion and ventilation air flow must not be
obstructed.
The water heater with draft hood installed must be
connected to a chimney or listed vent pipe system,
which terminates to the outdoors. Never operate the
water heater unless it is vented to the outdoors and has
adequate air supply to avoid risks of improper operation,
explosion or asphyxiation.
• For proper draft hood attachment, the draft hood legs
• Place the draft hood legs in the receiving holes on the
• Place the vent pipe over the draft hood. With the vent
Obstructed or deteriorated vent systems may
present serious health risk or asphyxiation.
19
American National Standard ANSI Z21.66 CGA 6.14
National Fuel Gas Code ANSI Z223.1/NFPA
may be angled slightly inward.
top of the water heater. The legs will snap in the holes
to give a tight fit. Secure draft hood with the supplied
brackets.
pipe in position, drill a small hole through both the
vent pipe and draft hood. Secure them together with a
sheet metal screw. See
Figure 16
(page 20).