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FV42
85-03-01068
Gas Input Rate Verification Requirements
Natural Gas Applications Gas Input Rate Verification Procedures
Verify main orifice size. The main orifice body has the orifice size stamped on it. Natural gas orifice size will be
#38 (rear burner) and #44 (front burner) for all elevations.
Verify that the manifold gas pressure is within 3.5" WC +/- ⅛". Once setup, read the main home gas supply
meter reading.
Write the initial reading here:
Initial Gas Meter Reading is _______________ Therms.
Turn off all other fireplaces and their pilot flame in the home.
Run this fireplace for a period of 30 minutes on maximum flame size. Turn off main burner and pilot flame.
Read the main home gas supply meter reading after the 30 minutes of burn time.
Write the reading here:
Final Gas Meter Reading is _______________ Therms.
To calculate the following: Subtract Initial Gas Meter from Final Gas Meter Reading. This will yield the
number of Therms used during the 30-minute burn time.
Write the number of Therms used here:
_______________ Therms.
Multiply the Therms used by 200,000.
Write the result here:
_________________Btu
The result must be within 5% of 44,000 Btu.
LP Gas Applications Gas Input Rate Verification Procedures
Verify the main orifice size. The main orifice body has the orifice size stamped on it. LP gas orifice size should
be #54 (front and rear burners) for all elevations.
Verify that the manifold gas pressure is within 10.0" WC +/- ⅛".
Use the procedure above to calculate the Btu. The result must be within 5% of 44,000 Btu.
High-Altitude Derating
If you are derating this fireplace at a high altitude, attach the High-Altitude Deration Label to the back side of
the wire harness plate located in the air gap under the firebox of the fireplace. Prior to attaching the labels,
fill in all the information that is requested in these labels.
For installations from 610-1370 meters (2,000-4,500’) the orifice sizes (DMS) for natural gas are #38 (rear)
and #44 (front) and LP gas are #54 (rear) and 54” (front), respectively. See data plate for additional
information. For high-altitude installations consult the local gas distributor or the authority having jurisdiction
for proper rating methods.
If the installer must convert the unit to adjust for varying altitudes, the information sticker must be filled out
by the installer and adhered to the fireplace at the time of conversion:
This fireplace has been converted for use at an altitude of ______________
Orifice size _________________ Manifold pressure ___________________
Input (Btu/hr) _______________ Fuel type ___________________________
Date of conversion ___________ Converted by ________________________
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