Vent And Air Piping; Air Intake/Vent Connections - Lochinvar Crest 2.5 Installation & Operation Manual

2
General venting
When a sidewall or vertical rooftop combustion air supply
system is disconnected for any reason, the air inlet pipe must
be resealed to ensure that combustion air will be free of
contaminants and supplied in proper volume.
Failure to properly seal all joints and seams
DANGER
as required in the air inlet piping may
result in flue gas recirculation, spillage
of flue products and carbon monoxide
emissions causing severe personal injury
or death.

Vent and air piping

This product has been approved for use with stainless steel
vent systems.
Use only the materials, vent systems, and
WARNING
terminations listed in Table 2A.
NOT mix vent systems of different types
or manufacturers, unless listed in this
manual. Failure to comply could result
in severe personal injury, death, or
substantial property damage.
Installations must comply with applicable
NOTICE
national, state, and local codes. Stainless
steel vent systems must be listed as a
UL-1738 approved system for the United
States and a ULC-S636 approved system
for Canada.
Installation of a stainless steel vent system
NOTICE
should adhere to the stainless steel vent
manufacturer's installation instructions
supplied with the vent system.
The Crest is supplied with an integral
NOTICE
FasNSeal vent connector (FIG. 2-1). The
installer must use a specific vent starter
adapter supplied by the vent manufacturer
to adapt to different vent systems.
Table 2A Approved Stainless Steel Vent Manufacturers
ProTech Systems (Simpson Dura-Vent Co.)
Z-Flex (Nova Flex Group)
Heat Fab (Selkirk Corporation)
Metal Fab
Securities Chimneys International
Schebler Chimney Systems
16
DO
Approved Stainless Steel Vent Manufacturers
Make
Installation & Operation Manual

Air intake/vent connections

1. Combustion Air Intake Connector (FIG. 2-1) - Used to
provide combustion air directly to the unit from outdoors.
A fitting is provided with the unit for final connection.
Combustion air piping must be supported per guidelines
listed in the National Mechanical Code, Section 305, Table
305.4 or as local codes dictate.
2. Vent Connector (FIG. 2-1) -
passageway for conveying combustion gases to the
outside. A transition fitting is provided on the unit for
final connection. Vent piping must be supported per the
National Building Code, Section 305, Table 305.4 or as
local codes dictate.
Figure 2-1 Combustion Air Adapter
AIR PIPE
(FIELD SUPPLIED)
ADAPTER
SHIPPED LOOSE
WITH THE BOILER
GASKET
VENT PIPE
(FIELD SUPPLIED)
The Crest uses model specific combustion air intake and vent
piping sizes as detailed in Tables 2B and 2C on page 17.
Increasing or decreasing combustion air
NOTICE
or vent piping to sizes not specified in this
manual is not authorized.
FasNSeal Vent
Saf-T Vent
Corr/Guard
Secure Seal SS
Used to provide a
CONNECTOR
Model
Z-Vent
eVent