Appendix B: Instructions For High Altitude Installations - Crown Boiler BWF Series Installation Instructions Manual

Appendix B:
These instructions apply only to the following altitude ranges: Sea Level - 2000ft, 2001 - 10,200ft
These instructions contain specific information to setup your boiler to ensure proper operation.
As with most gas appliances, special consideration
must be given to when this boiler is installed at
altitudes above 2000ft. In the case of this boiler,
there are three basic differences between the sea
level and high altitude configurations:
• Smaller main burner orifice are
used – This results in an input
reduction of approximately 3.3% -per
1000ft for natural gas and 2.8% per 1000ft
for LP. This reduction in input results in a
correspondingly lower output and must be
taken into account when sizing the boiler.
• An air pressure switch (APS) with a lower
setting is used.
• The direct vent kit described in Appendix
A must be installed for all installations to
avoid burner "resonance" (combustion
air may still be drawn from indoors if
desired).
Elevation
Sea Level -
2000 ft
2001-
10,200 ft
109836-01 - 04/20
Instructions for High Altitude Installations (US Only)
Table B.1 Sea Level vs High Altitude Configurations
Model
BWF070, BWF063
BWF105, BWF094
BWF140, BFW126
BWF175, BWF157
BWF210, BWF189
BWF245,BWF220
BWF070, BWF063
BWF105, BWF094
BWF140, BWF126
BWF175, BWF157
BWF210, BWF189
BWF245, BWF200
Table B.1 lists the specific differences between
sea level and high altitude configurations. Boilers
that are factory configured for use at altitudes
above 2000ft are marked as such on both the
packaging and rating plate. They include all of
the modifications described above, including
installation of the direct vent kit.
High altitude boilers are shipped with the intake
terminal loose:
• When combustion air is drawn from
outside, install the air intake terminal and
piping as described in Appendix A.
• When combustion air is drawn from
indoors, install the intake terminal directly
on the boiler's intake collar as shown
in Figure B.2. Secure with at least two
#8 self-drilling sheet metal screws (not
provided).
NOTICE: High altitude installations of
BWF063, BWF070, BWF094, and BWF105
using indoor combustion air require a 5" right
side clearance for installation of the intake
terminal.
Main Burner Orifice
Drill Size (PN)
Qty
Nat. Gas LP
4
6
8
#48 #56
(950304) (950331)
10
12
14
4
6
8
#49 #57
(950305) (950332)
10
12
14
Direct Vent Air Pressure
Kit Switch
109839-01
Optional
(1.24 Max Break)
Standard 110096-01
Equipment (0.85 Max Break)
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