IPT Installation Manual

17
9-511.4
INSTALLATION - HIGH ALTITUDE ACCESSORY KIT
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:
M P
ACT
= Manifold Pressure (in. W.C.) at Altitude –
Manifold pressure setting for the heater
being installed
BTU
TBL
= BTU/ft
3
Content of Gas –
Obtained from Tables 16.1 or 16.2
(whichever is applicable)
BTU
ACT
= BTU/ft
3
Content of Gas –
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: High and Low fire manifold pressure must both be
adjusted using the calculation shown in 17.1.
Table 17.1 - High Altitude Kits for IPT
Conversion IPT - LP 50 60 75 100 125 150 175 200
0-2000 FT
77839
77840 77841 77842
77843 77844 77845
77846
2001-3500 FT
77847
3501-4000 FT
4001-4500 FT
4501-5000 FT
5001-5500 FT
77850
77851
77852 77853
5501-6000 FT
6001-6500 FT
77854 77855
6501-7500 FT
Conversion IPT - Natural Gas 50 60 75 100 125 150 175 200
0-2000 FT 77823 77824
77825
77826 77827 77828 77829 77830
2001-3500 FT
77831
77832
3501-4000 FT
77834
4001-4500 FT
4501-5000 FT
5001-5500 FT
77836
5501-6000 FT
77837
6001-6500 FT
77838
6501-7500 FT