Thorne & Derrick EXHeat RFA Series, Installation, Operation And Maintenance Instructions

Page: 2 / 8

2
1.0 GENERAL
1.1 All work should be carried out by suitable qualified personnel.
1.2 Heaters must be handled with care and stored in dry conditions.
1.3 Adequate withdrawal space must be provided to allow the removal of the heater assembly.
1.4 Carefully remove all protective packaging and visually inspect unit for any transit damage.
1.5 All prevailing rules, regulations and bylaws in force at the time and place of installation must be observed.
1.6 Heaters must only be immersed in the fluid they are designed to heat.
1.7 The introduction of alternative fluids even in small concentrations for purposes such as sterilising may cause
serious damage to the heater and will invalidate the warranty.
1.8 Any modification not carried out by Exheat Limited or its approved agent will invalidate certification and
warranty.
1.9 Precautions must be taken to prevent damage to enclosure seals.
1.10 For flameproof heaters reference must be made to IEC / EN 60079-17.
1.11 All electrical testing must be carried out in a non-hazardous area.
1.12 Precautions must be taken to prevent damage to machined surfaces and threads of flameproof enclosures.
1.13 Any special conditions for safe use detailed on the hazardous area certification for flameproof heaters must be
complied with.
2.0 INSTALLATION
2.1 The heater should be securely fixed in position and all terminal connections checked for tightness before
energising.
2.2 The heater must be installed horizontally unless it has been specified and manufactured for use in a vertical
orientation.
2.3 The installed orientation of horizontally mounted heaters must be such that any thermostats or other temperature
sensors are uppermost.
2.4 Sealing gaskets must be undamaged.
2.5 The terminal box must not be used for tightening heater into tank or vessel.
3.0 ELECTRICAL SUPPLY CONNECTION
3.1 Refer to wiring diagram (inside the cover – non-flameproof heaters only).
3.2 The cable entry is positioned on the side of the terminal box.
3.3 Before connection ensure that the supply corresponds with that specified on the rating label.
3.4 Ensure that the sizes and types of cables to be used are suitably rated for the load and temperature of the unit.
3.5 Each heater must be protected by a suitably rated over current device.
3.6 Cables must enter the terminal box via a suitable cable gland to maintain the IP rating and be fitted by a qualified
person.
3.7 For flameproof heaters, cables must enter the heater terminal box via ATEX certified Ex d (for ATEX certified
heaters) or IECEx certified Ex d (for IECEx certified heaters) cable glands (not supplied) and be fitted by a
qualified person.
3.8 The cover (and body – where applicable) of FP and RF series terminal boxes are unscrewed after slackening a
locking grub screw using a 3mm A/F hex key. When re-fitting ensure that the ‘o’ ring seal is in good condition
and correctly located. The main cover threads
MUST be kept clean and free from any debris at all times.
3.9 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.