4.0 ELECTRICAL
SUPPLY CONNECTIONS Refer to Fig.3
4.1
Refer to wiring diagram (Fig.3)
4.2
The cable entry is positioned on the side of the terminal box.
4.3
Before connection ensure that the supply corresponds with that specified on the rating label.
4.4
Ensure that the sizes & types of cable to be used are suitably rated for the load & temperature of the unit.
4.5
Each heater must be protected by a suitably rated over current device.
4.6
The cables must enter the heater terminal box via a certified Ex d cable gland (not supplied) & be fitted by a
qualified person.
4.7
The HFT series terminal boxes are secured by four (4) screws securing the lid. When re-fitting ensure that the
“O” ring seal is in good condition & correctly located.
4.8
The installer or end user must connect to the Exheat supplied terminals within the terminal box –
DO NOT
–
connect to or disturb factory fitted heating element wiring.
5.0 EARTH
CONNECTION
5.1
WARNING
– these heaters
MUST BE EARTHED
.
5.2
The external earth connection is located adjacent to one of the terminal box cable entries.
5.3
An internal earth connection is provided inside the terminal box.
6.0 OPERATION
6.1
Important
– the unit
MUST
be full of water before switching on the electricity supply & at all times whilst
energised.
6.2
Heat is transferred by means electric heating elements.
6.3
Control of the heater is facilitated by thermostats, & reference should be made to the wiring diagram to
ensure that these are correctly connected & set prior to energising the heater.
6.4
Where a manual reset cut-out is installed, the terminal box cover will have to be removed to enable a reset to
be carried out.
6.5 The
unit
MUST NOT
be used if suspected of being frozen. If water ceases to flow switch off the electricity
supply immediately at the isolating switch. If the unit is to be serviced or drained disconnect the electricity
supply before commencing the operation.
7.0 MAINTENANCE
7.1
All prevailing site safety regulations shall be adhered to at all times.
7.2
Before & whilst any maintenance activity is carried out, it must be ensured that there are no hazardous gases
present.
7.3
Equipment is to be fully isolated from the electricity supply before & whilst any work is being carried out.
7.4
Any damage or faults should be notified to Exheat Limited immediately.
7.5
For equipment certified for use in hazardous areas reference should be made to EN 60079-17 (especially table
1) in addition to the following recommendations.
7.6
Any replacement parts required must be obtained directly from Exheat. The use of any other parts will void
any certification and warranty.
7.7 3
Monthly
a.
Generally inspect the equipment for external damage or leaks.
3