Low Temperature Duct Heaters
Installation, Operation, and Maintenance Instructions
1.0 Handling
1.1 Unpack and handle with care to avoid damage to heater and
components
1.2 Make sure heater is protected from contamination during
storage. A dry environment if preferred.
1.3 Refer to Application Data link for additional information
related to heater system design and selection.
2.0 Safety
2.1 WARNING: Make sure power supply is turned off before
installation or service of electric heater to prevent electrical
shock or damage to equipment.
2.2 WARNING: Circuit should have separate disconnect means
which shall be capable of being locked in the open position
and also in sight from the heater.
2.3 WARNING: Wiring must conform to the National Electric
Code and Local Regulations and should be performed by a
a qualified electrician. Make sure wiring is of a suitable
temperature rating, amperage rating, and the location.
2.4 WARNING: When servicing, handle with caution, the heater
surface may be hot.
2.5 WARNING: Do not install heater into a medium or an
environment that could result in an explosion, fire, or
hazardous condition. Contact Vulcan regarding heaters that
are specifically designed for hazardous locations.
3.0 Installation and Operation
3.1 Caution: Make sure the heater supply voltage is the same
as the rated heater voltage.
3.2 Caution: Heater should be properly grounded to prevent
electrical shock hazard
3.3 Caution: Do not support or suspend heater from termination
or wiring
3.4 A common cause of heater failure is contamination of the
the internal heater components through the termination end
of the heater. Make sure the heater is protected from
contamination in the final application.
3.5 Make sure heater termination is not exposed to water or
other liquids. Make sure that no dripping from
condensation on cold water pipes or other sources can fall on
any exposed electrical wiring connections or components.
3.6. Terminations should be properly tightened and connected
to hook-up wiring. A loose connection will result in over-
heating at the connection and could lead to premature
failure. Where possible, use a wrench or pliers to prevent
twisting of the terminals during installation.
3.7 Duct heaters should be installed into the side or bottom of the
duct to minimize heat transfer into the terminal enclosure. A
mounting flange on each heater is predrilled for 3/16" self
tapping holes for installation into air duct.
3.8 Airflow direction is as noted on label attached to cover of unit.
Minimum air flow requirements are noted within catalog model
section.
3.9 Make sure installation allows free air movement of air through
the duct work and over the finned tubular heaters.
3.10 It is recommended that the heater be wired in such a way that
a failure in the fan motor providing airflow will automatically shut
off the heater.
3.11 The automatic over-temperature thermostat is set at 210 F and
the manual reset limit thermostat set at 335 F
3.12 Heater should be wired per diagram supplied with
unit or refer to our following website page for common circuits:
Common_Wiring.pdf
3.13 Do not exceed 105% of rated voltage. Higher voltages result in
higher wattage output which could damage the heater, system,
or medium heated.
3.14 Thermostat notes:
3.14.1 Do not exceed amperage rating of thermostat. Wire
through contactor(s) as required.
3.14.2 Thermostats are designed for heater control only and
are not intended for use as a direct control of motors,
fans, or other devices.
3.14.3 Do not use thermostat as a power disconnection
means for the heater assembly.
4.0 Maintenance
4.1 For most applications, no heater maintenance is required.
4.2 Disconnect line switch prior to any testing or work on the heater
4.3 Check heater terminations after the initial 8 hours and tighten any
loose terminal and jumper connections.
4.4 Recheck wiring periodically to ensure wiring has not become
damaged, worn, or loose due to vibration or other application
related conditions. Tighten, repair, or replace as needed.
5.0 Trouble Shooting
5.1 WARNING: Disconnect power supply to heater(s) before performing
ny trouble shooting procedures.
5.2 Check supply voltage to heater to ensure there is power.
5.3 Check wiring circuit- make sure heater is properly wired and all
supporting controls, relays, contactors, and other circuit related
switches are also properly wired and functional.
5.4 Check heater(s)- No heat due to a heater failure is generally due
to an open heater circuit. Check heater resistance across both
terminals or leads. A reading of infinity (no continuity) indicates
an open circuit within the element and the heater must be
replaced.
5.5 Longer than normal heat up time for units with more than one
heating element may be the result of an individual heating
element failure.
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