Lochinvar RPD-I-S User Manual page 10

Venting continued-
In locations where sustained outside air temperatures are below freezing, it is
possible for the vent terminations to accumulate ice build-up due to adverse local
climate conditions (prevailing wind direction, wind speed, termination orientation,
etc.). The optional concentric vent terminal is more resistant to this ice build-up.
In more severe temperature conditions, an optional manufacturer approved air
intake relief device is available and may be installed, per the instructions, to
prevent nuisance shut down of the water heater. The air intake relief device may
be installed with the concentric vent termination or the standard separate vent
terminations. Consult the concentric vent and/or the air intake relief device
instructions for installation requirements.
Vent pipes serving power vented appliances are classified by building codes as
"vent connectors". Required clearances from combustible materials must be
provided in accordance with information in this manual under LOCATION OF
WATER HEATER and CLEARANCES, and with National Fuel Gas Code and
local codes.
For installations in Canada, field supplied plastic vent piping must comply
with CAN/CGA B149.1 (latest edition) and be certified to the Standard For
Type BH Gas Venting Systems, ULC S636. Components of this listed
system shall not be interchanged with other vent systems or unlisted
pipe/fittings. All plastic components and specified primers and glues of the
certified vent system must be from a single system manufacturer and not
intermixed with other system manufacturer's vent system parts.
The supplied vent connector and vent termination are certified as part of the
water heater.
Venting System Condensation
Condensate formation does not occur in all installations of power direct vented
water heaters, but should be protected against on installations where
condensation can form in the venting system.
Formation of condensation in the venting system of Power Vented water
heaters is dependent upon installation conditions including, but not limited to:
ambient temperature and humidity of installation location;
ambient temperature and humidity of venting space;
vent distance and slope;
and product usage.
NOTICE
NOTICE
10 RPD-I-S Rev A