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I-UBX-UBZ-UDX-UDZ (03-21) 1034344-0
Warranty
Refer to the limited warranty form in the literature bag provided with the unit. The warranty is void if:
• Wiring is not in accordance with the diagram furnished with the heater.
• The unit is installed without proper clearance to combustible materials.
• A fan model is connected to a duct system or if the air delivery system is modified.
Installation Codes
• These units must be installed in accordance with local building codes. In the absence of local codes, in the United
States, the unit must be installed in accordance with the National Fuel Gas Code, ANSI Z223.1. A Canadian
installation must be in accordance with the CSA B149 Installation Codes. These codes are available from CSA
Information Services, 1-800-463-6727. Local authorities having jurisdiction should be consulted before installation
is made to verify local codes and installation procedure requirements.
• Installations in aircraft hangars should be in accordance with ANSI/NFPA No. 409 (latest edition), Standard for
Aircraft Hangars. Installations in public garages should be in accordance with ANSI/NFPA No. 88A (latest edition),
Standard for Parking Structures. Installations in repair garages should be in accordance with ANSI/NFPA No. 88B
(latest edition), Standard for Repair Garages. In Canada, installations in aircraft hangars should be in accordance
with the requirements of the enforcing authorities, and in public garages, in accordance with CSA B149 codes.
• If the heater is being installed in the Commonwealth of Massachusetts, installation must be performed by a licensed
plumber or licensed gas fitter.
Unit Location
⚠ CAUTION ⚠
• Unit heaters should not be used in an application where the heated space temperature is below 50°F.
Operating under low ambient conditions may cause condensation to form in the heat exchanger.
• Do not locate the heater where it may be exposed to water spray, rain, or dripping water.
• Refer to the venting instructions provided with the unit for venting requirements.
• Refer to the following sections of this manual to determine where to suspend the heater: Heater Throw, Mounting
Height Requirements, Hazards of Chlorine, Dimensions, Clearances, Weights, Combustion Air Requirements,
and Installation.
Heater Throw
Figure 1 shows throw patterns for fan model units. Table 2 and Table 3 list throw distances for standard, adjustable
horizontal louvers on heaters suspended at varying mounting heights. The louver angles listed are relative to the
top of the heater. The throw pattern changes with the addition of optional vertical louvers and/or downturn nozzles.
Z = Distance at which air velocity drops below 50 feet (15.2 meters) per minute
Figure 1. Heater Throw Patterns (Refer to Table 2 and Table 3)
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