HAZARDOUS LOCATION HEAT TRANSFER UNIT

摘要

A two chamber heat transfer unit configured such that hazardous air can circulate through one of the chambers and potential ignition source components are contained in another chamber through which the gas to be heated or cooled will circulate.

主权项

1. A method of making a heat transfer unit for use in a location where hazardous air is present, the method comprising:
forming a first compartment within a housing including therein
all potential ignition source elements of the heat transfer unit,a first heat exchange coil, anda first fan configured to cause a gas to enter the first compartment, interact with the first heat exchange coil, and then exit the first compartment; forming a second compartment within the housing, sealed off from the first compartment, and including therein at least
a second heat exchange coil, anda second fan, the second fan being positioned within the second compartment so that, when the heat transfer unit is in operation, the second fan will cause the hazardous air to enter the second compartment, interact with the second heat exchange coil, and then exit the second compartment; the first compartment being configured to be pressurized such that, when the heat transfer unit is in operation, the first compartment will have a first internal pressure and the second compartment will have a second internal pressure, with the first internal pressure being higher than the second internal pressure.