HEAT AFT Series, Installation, Operation And Maintenance Instructions

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7.0 OPERATION
7.1 Heat is generated by means of electric heating elements. Once energized the air warmers
will continue to operate until de-energized by an external (or integral) air thermostat.
7.2 To adjust the temperature settings on an integral thermostat (HFT), Remove the lid (as per
section 5.0) and rotate the adjustable control knob clockwise to increase the desired set-point
or anti-clockwise to reduce the set-point.
7.2.1 To adjust the temperature settings on an externally adjustable thermostat (AFT), Remove the
lid (as per section 5.0) and rotate the adjuster clockwise (by use of a large flat blade
screwdriver) to increase the desired set-point or anti-clockwise to reduce the set-point.
7.3 The FAW and FCR ranges are designed to operate in ambient temperatures of up to +40°C
(T3 & T4 rated units) and +60°C (T2 rated units) and the user must ensure that this
temperature is not exceeded at any time.
7.4 The STW air warmer range is designed to operate in ambient temperatures of up to +60°C.
Where an integral adjustable thermostat is provided, this senses the ambient air temperature.
Rotate the control knob clockwise to increase the set-point or anticlockwise to reduce the set-
point.
7.5 CAUTION – Check that the voltage on the heater nameplate is compatible with the mains
supply being used before energising the heater.
8.0 MAINTENANCE
8.1 All prevailing site safety regulations shall be adhered to at all times.
8.2 Equipment shall be checked regularly for any dust accumulation which must be removed from
all surfaces.
8.3 Before and whilst any maintenance activity is carried out, it must be ensured that there are no
hazardous gases or dusts present.
8.4 Equipment is to be fully isolated from the electrical supply before and whilst any work is being
carried out.
8.5 Any damage or faults should be notified to Exheat Industrial Ltd immediately.
8.6 Any replacement parts required must be obtained directly from Exheat Industrial Ltd. The use
of any other parts will void any certification and warranty.
8.7 Equipment is certified for use in a hazardous area and reference should be made to IEC/EN
60079-14 for selection and installation.
8.7.1 IEC/EN 60079-17 for inspection and maintenance of electric apparatus for use in potentially
explosive atmospheres.
In addition to the following recommendations:
8.7.2 3 Monthly
•
Generally inspect the equipment for external damage or leaks.
•
Ensure that any spaces between the element fins, remains clear and that the airflow
remains unrestricted.
8.7.3 6 Monthly
•
Isolate the electrical supply and remove the cover (As section 5.0)
•
Internals should be clean and dry.
•
Ensure terminals are intact and secure.
•
Heating element insulation re
sistance to be at least 2MΩ
. Please refer to section 3.0
for further information
•
Refit cover with new gasket or ‘O’ ring if required (refer to section 5) and re-tighten
using only the socket head screws provided.