Bard Wall-Mount wall series WG5S1 User Manual
Page 7
Form No.
S3396-613
Supersedes
S3396-513
Page
7 of 12
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Heating input, and thus heating output, decreases with altitude. No orifice change is required up to 6,000 feet elevation and derate occurs naturally due
to altitude impact. Natural gas models may require orifice change based on BTU content of gas. See Natural Gas Orifice and Altitude Tables on
next page for details. For Propane Gas see the Propane Gas Conversion Table below.
All orifice sizes shown are millimeters (mm).
Above 6,000 feet elevation orifice changes are required, and capacity reductions are a function of altitude impact and orifice change. Pressure switch
change is required above 6,000 feet elevation. For Natural Gas see the Orifice and Altitude Tables on next page. For Propane Gas see the Propane
Gas Conversion Table below
.
Important Information Concerning Altitude Impact on Heating Input Ratings
Propane Gas Conversion Kits -- Fits All WG-Series Models
Gas Pressure Inches W.C.
Minimum permissible gas supply pressure for purpose of input adjustment:
Natural 4.5 LP 11.0
Maximum permissible gas supply pressure for purpose of input adjustment:
Natural 11.0 LP 13.0
Manifold Pressure:
Natural 3.5 LP 10.0