Modine Manufacturing IPT Installation And Service Manual page 17

INSTALLATION - HIGH ALTITUDE ACCESSORY KIT
Table 17.1 - High Altitude Kits for IPT
Conversion IPT - Natural Gas
0-2000 FT
2001-3500 FT
3501-4000 FT
4001-4500 FT
4501-5000 FT
5001-5500 FT
5501-6000 FT
6001-6500 FT
6501-7500 FT
Conversion IPT - LP
0-2000 FT
2001-3500 FT
3501-4000 FT
4001-4500 FT
4501-5000 FT
5001-5500 FT
5501-6000 FT
6001-6500 FT
6501-7500 FT
If the heating value of the gas being supplied is different than
the values shown in Tables 16.1 and 16.2, use the following
equation to determine the appropriate manifold pressure for the
altitude and gas heating value being supplied.
Equation 17.1 - Manifold Pressure for Derated Gas
WHERE:
MP ACT Manifold Pressure (in. W.C.) at Altitude –
=
Manifold pressure setting for the heater
being installed
3
BTU TBL = BTU/ft
Obtained from Tables 16.1 or 16.2
(whichever is applicable)
3
BTU ACT BTU/ft
=
Obtained from the local utility company
MP SL = Manifold Pressure (in. W.C.), at Sea Level –
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 2-stage or modulating gas controls. No
adjustments to the low fire manifold pressure are necessary on
these units.
50 60
77823 77824
77832
77831
77834
77836
77838
50 60
77839
77840
77847
77851
77850
77854
Content of Gas –
Content of Gas –
75 100 125
77825
77826 77827
77837
75 100 125
77841 77842
77843
77852 77853
9-511
150 175 200
77828 77829 77830
150 175 200
77846
77844 77845
77855
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