Definitions Of Oil Fired Heater Types; Low Pressure; High Pressure; Indirect - PHP Heat Wagon LVF90A Service Manual

Defining Oil Fired Heaters
This book is about oil fired torpedo heaters.

Low Pressure

Low pressure heaters operate with an air pump which consists of a rotor and
vanes. Operating pressure rarely goes above 9.0 PSI.

High Pressure

High pressure oil heaters use a mechanical gear type fuel pump driven by the
motor to reach a high level of pressure. Operating pressure can vary consider-
ably. Most heaters fall within a range of 80 to 175psi.
Indirect Fired
Indirect oil heaters separate the products of combustion and moisture from
the heated output air. The separation is accomplished by the use of a heat
exchanger. Combustion heat passes through the heat exchanger which trans-
fers heat to the outside of the exchanger. The clean, moisture free air outside
the exchanger is pushed out by a fan. The products of combustion and mois-
ture vent out of a flue stack.

Identifying Heater Manufacturers

There have been five primary manufacturers of low pressure heaters. Desa,
Pinnacle, Mr. Heater, Toro and National Riverside (Universal) have made over
100 brands and account for 98% of all oil fired heaters.
Identifying the manufacturer and/or a "mystery heater" is sometimes very
difficult. The best way is to try and find a part number on either the nozzle,
motor or fan. This will not only tell us the manufacturer, but its btu size (try
to use 2 or more these).
You can also match your heater or filters with the following pictures—that
will tell you the manufacturer.
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