Modine Manufacturing HD Manual page 172

INSTALLATION - HIGH ALTITUDE ACCESSORY KIT
If the heating value of the gas being supplied is different than
the values shown in Tables 11.1 and 11.2, use the following
equation to determine the appropriate manifold pressure for the
altitude and gas heating value being supplied.
Equation 12.1 - 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 3 Content of Gas –
BTU
TBL
Obtained from Tables 11.1 or 11.2 (whichever is
applicable)
= BTU/ft 3 Content of Gas –
BTU
ACT
Obtained from the local utility company
MP = Manifold Pressure (in. W.C.), at Sea Level –
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 2-stage or modulating gas controls. No
adjustments to the low fire manifold pressure are necessary on
these units.
12
Table 11.3 - High Altitude Kits for PDP/BDP
US and Canada
150
Altitude (ft)
Item
Code
not re-
0-2,000
quired
2,001-7,500 67248 67248 67248 67248 67248 67248 67248
7,501-8,500 68408 55941 67248 55942 67248 68406 68407
8,501-9,500 68408 55941 67248 55942 67248 68406 68407
9,501-10,000 68408 55941 67248 55942 68408 68406 68407
10,001-11,000 55948 55941 67248 77785 68408 68406 68407
11,001-12,000 55948 55941 67248 77785 68408 68406 55941
12,001-13,000 55948 55941 67248 77785 68408 68406 55941
13,001-14,000 55948 55941 55941 77785 68406 68406 55941
j For Label Only (67248) kits, Modine part number 5H0807146005 is
required to be filled out and attached to the unit by the installer.
Please contact the local Modine representative at 1.800.828.4328 (HEAT).
6-580.18
Model Size
175 200 250 300 350
Item Item Item Item Item
Code Code Code Code Code
not re- not re- not re- not re- not re-
quired quired quired quired quired
j
400
Item
Code
not re-
quired