I-RPB (04-21) 131782-A, Page 11
High Elevation Burner Orifices
Installation
Altitude (Feet)
Installation
Location
Unit Size
Natural Gas Propane
PN Orifice Size PN Orifice Size
2001–3000 US
125, 175, 225, 300, 350, 400 84437 #42 11834 #54
150,250 38678 #45 11830 #55
200 11833 #44 11830 #55
2001–4500 Canada
125, 175, 225, 300, 350, 400 11828 #43 11834 #54
150,250 38678 #45 11830 #55
200 11833 #44 11830 #55
3001–4000 US
125, 175, 225, 300, 350, 400 11828 #43 11834 #54
150,250 38678 #45 11830 #55
200 11833 #44 11830 #55
4001–5000 US
125, 175, 225, 300, 350, 400 11828 #43 11834 #54
150,250 38678 #45 11830 #55
200 11833 #44 11830 #55
5001–6000 US
125, 175, 225, 300, 350, 400 11828 #43 97360 1.35 mm
150,250 16590 #46 39658 #56
200 38678 #45 39658 #56
6001–7000 US
125, 175, 225, 300, 350, 400 11833 #44 97360 1.35 mm
150,250 84853 #47 39658 #56
200 38678 #45 39658 #56
6.2 High Elevation (>2,000 Feet/609 Meters) Installations
NOTES:
• High elevation (>2,000 feet/609 meters) application with this unit depends on the installation elevation
and the heating value of the gas. At high elevations, the heating value of natural gas is always lower
than the heating value at sea level.
• Deration is necessary to compensate for low atmospheric pressure at high elevations. Generally this
will require obtaining the gas heating value from the local gas utility and replacing the burner orifices.
For high elevation (>2,000 feet/609 meters) installations that require orifice replacement, replace the burner orifices as
follows:
1. Determine model number and rated input (BTUh) from unit’s rating plate.
2. Determine appropriate orifice replacement (refer to High Elevation Burner Orifices table) for installation elevation.
3. Unthread existing gas orifices from gas manifold.
⚠ DANGER ⚠
Do not use Teflon tape or pipe joint compound on the orifice threads. The hole in the orifice may become
blocked and may cause fire, explosion, property damage, carbon monoxide poisoning, personal injury,
or death.
⚠ DANGER ⚠
Use only using factory-supplied orifices. Do not attempt to drill out orifices in the field. Improperly
drilled orifices may cause fire, explosion, carbon monoxide poisoning, personal injury, or death.
4. Thread replacement gas orifices into gas manifold. To prevent cross-threading, hand-tighten orifices into gas manifold
until snug and then tighten one-half to one turn using wrench.
⚠ DANGER ⚠
DO NOT use an open flame to check for gas leaks.
5. Check all connections for gas leaks using commercial leak-detecting fluid or rich soap and water solution. Leaks
are indicated by presence of bubbles. If leak is detected, tighten connection. If leak cannot be stopped by tightening
connection, replace part(s).
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