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INSTALLATION - HIGH ALTITUDE ACCESSORY KIT
If the heating value of the gas being supplied is different than the values
shown in Tables 12.1 and 12.2, use the following equation to determine the
appropriate manifold pressure for the altitude and gas heating value being
supplied.
Equation 13.1 - Manifold Pressure for Derated Gas
WHERE:
MP
= Manifold Pressure (in. W.C.) at Altitude –
ACT
Manifold pressure setting for the heater being
installed
= BTU/ft
Content of Gas –
BTU
3
TBL
Obtained from Tables 12.1 or 12.2 (whichever is
applicable)
= BTU/ft
Content of Gas –
BTU
3
ACT
Obtained from the local utility company
= Manifold Pressure (in. W.C.), at Sea Level –
MP
SL
Use 3.5" W.C. for natural gas and 10.0" W.C. for
propane gas
NOTE: Only the primary manifold pressure should be adjusted
on units equipped with two-stage or modulating gas controls.
No adjustments to the lowf fire manifold pressure are necessary
on these units.
6-561.12
13
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