THP-400A, THP-500A and THP-550 Installation and Service Manual
Set-Up
• Keep fresh-air intake and heated-air discharge clear of obstruction.
• Provide clearance to allow access to vestibule, blower, and motor compartments.
• Heater must be level and in compliance with minimum-clearance and minimum-distance
requirements for combustible materials. See Rating Information Table on page 5.
• Position heater to draw 100% fresh, outside air through its intake grill.
• Do not use or operate the heater in the presence of combustible vapors or liquids.
• Maintain a maximum voltage differential of plus or minus 10% while unit is running.
• Do not move, handle, or service heater while hot, running, or connected to power supply.
• Check for gas leaks and proper functioning during installation, periodically, or when relocating.
Typical Heater Installation
Natural Gas Installations
• See Rating Information Table on page 5 for proper inlet pressure.
• Use external regulator supplied on all installations over 4-psi.
• Gas meter and supply system must be able to supply the minimum supply pressures as specified
in the Rating Information Table on page 5.
• Follow all federal, state, and local codes governing temporary-gas connections.
• Leak test all gas connections using a 1:3 solution of soap and water.
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