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ALNOR
®
ventilation systems
is a legally protected trademark and technical patent. All rights reserved.
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User Manual
HDE
components
•
electric shock due to earthing failure
•
electric shock due to electrical short.
Table 2 below shows main causes of danger due to improper operation:
Table 2 Identification of hazards, their causes and handling improper operation of HDE circular duct electric heaters.
9.4 Handling in case of hazard
In case of hazard, proceed as follows:
•
first of all, disconnect the heater from power supply so that there is a visible gap in the power supply
circuit, inspect the heater
•
if the automatic thermal protection AT is engaged at +60°C, the heater will automatically restart after it
cools down
•
if the manual thermal protection MT is engaged at +90°C, the heater should be restarted manually after
it cools down
•
use powder extinguisher in the event of heater fire.
Table 3 below summarizes the possible hazards, their causes and proper handling in such situations:
Table 3 Identification of hazards, their causes and proper handling for HDE circular duct electric heaters.
Hazard
Cause
Cause
burns due to overheat
of heating components
reduced air flow speed
below 1.5m/s
replace the damaged fan, clean the dirty filter, disconnect
the heater from the electrical installation
burns due to overheat
of heater casing
reduced air flow speed
below 1.5m/s, too high
ambient temperature
replace the damaged fan, clean the dirty filter, disconnect
the heater from the electrical installation, reduce ambient
air temperature
burns due to heater fire
electrical short circuit
disconnect the heater from the electrical installation
electric shock
electrical short circuit
check electrical connections, check the earthing
Hazard
Cause
Handling
heating components overheat
reduced air flow speed below 1.5m/s
replace damaged ventilator, replace
the dirty filter
reduced heating power of heating
components
contaminated air flowing through the
heating components
clean the heating components,
checking insulation between the filter
and the heater
electric shock
electrical short circuit
check electrical connections, check
the earthing
burns
heating components overheat, casing
overheat
disconnect the heater from the
electrical installation
explosion
flow of explosive gas through heating
components
cut off the gas supply
