Use and Care Manual

The Propane/Natural Gas kits appearing in this installation manual
are for use with units which are going to be installed between 0
and 2,000 ft. (610m) elevation. If a unit is to be installed at higher
elevations, please refer to Owner’s Manual.
Selection of the Proper Kit
Example: Convert a MHU100NGPAL for use with propane gas.
The appropriate model size is MH/HSU100. Referring to Table 1, in
the column for the 100 model size, it can be seen that the kit Part
Number is F163070.
* Ratings shown are for elevations up to 2,000 ft. (610m). For elevations above 2,000 ft. (610m), please refer to section “HIGH ALTITUDE”
in the manual.
Model MH/HSU100 MH/HSU125 MH/HSU150 MH/HSU200 MH/HSU250 MH/HSU300 MH/HSU400
BTU/HR Input* 100,00 125,000 150,000 200,000 250,000 300,000 400,000
Orifice Drill Size 53 52 1.65mm 51
Orifice Qty in
Kit
6 7 8 12
N.G. Manifold
Pressure
(W.C./kPa)
10”/2.5 kPa
Pressure Switch No Change Required
Part Number F163070 F163071 F163072 F163073
Table 1 - Natural to Propane gas Conversion Kit
Model MH/HSU100 MH/HSU125 MH/HSU150 MH/HSU200 MH/HSU250 MH/HSU300 MH/HSU400
BTU/HR Input* 100,00 125,000 150,000 200,000 250,000 300,000 400,000
Orifice Drill Size 42 38 37 36
Orifice Qty in
Kit
6 7 8 12
N.G. Manifold
Pressure
(W.C./kPa)
3.5”/0.87 kPa
Pressure Switch No Change Required
Part Number F 163074 F163075 F163076 F163077
Table 2 - Propane to Natural gas Conversion Kit
Figure 1 - Gas Manifold Assembly