THP-400A, THP-500A and THP-550 Installation and Service Manual
Introduction
The following recommendations are not intended to supplement requirements of federal, state, or
local codes having jurisdiction over the application and operation of this heater.
This instruction booklet contains the necessary information, instructions, and guidelines to achieve
maximum efficiency and safety from the TEMP-HEAT process heater. Please read all instructions
before attempting the set-up and operation of this heater.
The THP-Series Heaters are direct-fired, fresh-air heaters used to provide heat for buildings under
Class B furnaces as defined by NFPA 86 standard for ovens and furnaces. The area of fresh air
required for safe operation must be equal to the area of the unit’s intake grill. THP-Series Heaters
draw fresh outside air through the unit’s intake and discharge tempered air controlled by a remote
sensors. The heaters generate 85° F to 270° F discharge temperatures with models ranging from
300,000 BTU/hour to 4,500,000 BTU/hour operating on natural gas or propane vapor.
Most models are equipped with a remote temperature sensors and an adjustable automatic burner
control. This combination prevents extreme temperature fluctuations that occur when ON/OFF
burner controls are selected.
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