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VZ-VZH-VZT-IOM (08-24) 1047121-A
GENERAL INFORMATION—CONTINUED
Heater Location
⚠ CAUTION ⚠
• Model VZ and VZT heaters should not be used in an application where the heated space temperature
is below 40°F (4°C). Operating under low ambient conditions may cause condensation to form
in the heat exchanger.
• Do not locate a model VZ or VZT heater where it may be exposed to water spray, rain, or dripping
water.
• Model VZH heaters are water-resistant and are designed for harsh environments—defined as wet
or mildly corrosive—such as car washes, outdoor patios, and greenhouses. These models are
NOT intended for environments that are heavily-laden with chemicals or areas where halogenated
hydrocarbons are present. For mildly-corrosive environments, ducted clean fresh air is required.
A wind/rain hood is required for outdoor installations.
NOTE: The heater must be installed in a location that it is readily accessible for servicing.
Clearances
⚠ DANGER ⚠
• All listed minimum clearances to combustible materials MUST BE adhered to at all times. Adequate
clearance MUST BE provided around air openings into the combustion chamber, and there MUST
BE suitable clearance for service accessibility and for combustion/ventilation air.
• Minimum clearance from the heater must be maintained from vehicles parked below heater and
from heat-sensitive equipment and workstations. In all situations, clearances to combustibles
must be maintained. Signs should be posted in storage areas to specify maximum stacking height
to maintain required clearance to combustibles. Such signs must either be posted adjacent to
the heater thermostats or—in the absence of such thermostats—in a conspicuous location.
⚠ CAUTION ⚠
Building materials that have a low heat tolerance (plastics, vinyl siding, canvas, tri-ply, etc.) may
be subject to degradation at lower temperatures. It is the installer’s responsibility to ensure that
adjacent materials are protected from degradation.
Clearance to combustibles is defined as the minimum distance from the heater to a surface or object for which it is
necessary to ensure that a surface temperature of 90°F (50°C) above the surrounding ambient temperature is not
exceeded. Units must be installed so that clearances are in accordance with Table 2.
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