HEAT AFT Series, Инструкции по установке, эксплуатации и обслуживанию, Страница: 4 / 26

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3.0 PRE INSTALLATION INSPECTION AND CHECKS
3.1 Each heater and thermostat is manufactured to the highest standard with great care and
quality materials. All the goods are thoroughly inspected and tested before leaving the
manufacturing plant. They must be handled with care during storage and installation. Before
the installation starts it is advised that the heater is checked to ensure the insulation
resistance reading is above 2MΩ per element at 500 volts dc.
3.1.1 Should the heater fail this test, isolate the power and control circuits (if installed), and follow
the steps below:
•
Fill the terminal box with silica gel bags, and replace the terminal box lid.
•
Leave for 24hrs to draw any moisture out of the heater elements.
•
If you have a heated blanket, place this over the heater elements to help with the
drying. Heater blankets are available to purchase from
www.exheat-
industrial.com/contact/enquiry
•
If the insulation resistance has not been raised to a sufficient level after 24hrs, repeat
the process above with replacement gel bags.
•
Should the above not raise the insulation resistance to the required level please
contact the technical help on our website.
www.exheat-
industrial.com/contact/support
3.2 Insulation Resistance (Megger)
3.2.1 The ‘Megger’ should be applied between the phases and earth. A reading of greater than
2MΩ at 500 volts dc should be recorded. Should the whole heater be below this value
each
element would need to be checked to ascertain which one was low in resistance.
3.2.2 Use the continuity (Ohms) setting on the elements and check the resistance of each element
matches or is approximately equal to the results as per the electrical test certificate that would
have been sent with the heater.
4.0 INSTALLATION
4.1 Carefully remove the packaging from each item and check for damage. Immediately report
any damage to Exheat Industrial Ltd.
4.2 The heater should be securely fixed in position using the pre-drilled fixing holes, and all
terminal connections checked for tightness before energising.
4.3 The appliance must be securely fitted to a wall or floor using only the brackets provided.
4.3 The orientation of the heaters must be strictly adhered to with the feet facing down at all
times.
4.4 The installer or end user shall ensure that the unit has free and unrestricted air flow to allow
natural convection to occur at all times.
DO NOT COVER the heater and do not allow
anything to rest on or against it. This could lead to dangerous overheating and will invalidate
the hazardous area certification.
4.5 At no time is the ambient temperature to be allowed to rise above +40°C (FAW & FAW-C T3
& T4 variants) Or +60°C (T2 variants). This can be achieved by the use of Exheat Industrial
Ltd integral (if option available) or separate flameproof air sensing thermostats (HFT & AFT
type).
4.6 The STW range may be regulated by an integral or separate industrial air sensing thermostat
(SAT type)