Carbolite VMF/ASTM Series - Manual (Page 6)

SNF
6
MF31 – 3.06
5.0 R EPAIRS & R EPLACEMENTS
5.1 Safety Warning – Disconnection from Supply
Always ensure that the furnace is disconnected from the supply before repair
work is carried out.
5.2 Safety Warning - Refractory Fibrous Insulation
Insulation made from High Temperature Insulation Wool
Refractory Ceramic Fibre, (better described as Alumino Silicate Wool)
(ASW)
This product contains alumino silicate wool products in its thermal insulation. These materials
may be in the form of blanket or felt, formed board or shapes, mineral wool slab or loose fill wool.
Whilst there is no evidence of any long term health hazards, we strongly recommend that safety
precautions are taken whenever the materials are handled.
Exposure to fibrous dust may cause respiratory disease.
When handling the material always use an approved respiratory protection equipment
(RPE-i.e. FFP3), eye protection, gloves and long sleeved clothing.
Avoid breaking up waste material. Dispose of waste in sealed containers.
After handling rinse exposed skin with water before washing gently with soap (not
detergent). Wash work clothing separately.
Before commencing any major repairs we recommend reference to the European Association
representing the High Temperature Insulation Wool industry (www.ecfia.eu)
We can provide further information on request. Alternatively our service division can quote for
any repairs to be carried out at your premises or ours.
5.3 Panel Removal
Except for temperature controller replacement, access to components is by removal of the top
panel. Remove 10 self-tapping screws. Carefully save the 10 spacers (between the furnace case
and the top panel). Lift off the top panel; ensure there is somewhere to place it without pulling on
the wire connections.
5.4 Temperature Controller Replacement
200 & 201. These controllers are fitted to the back of the control panel, which can be separated
from the base by removal of two screws.
Before handling the controller: wear an anti-static wrist strap or otherwise avoid any possibility
of damage to the unit by static electricity.
Make a note of all the wiring connections to the controller. Disconnect the controller, fit the new
one, reconnect all the wires, and reassemble the furnace.
2132, 208P, 216P etc. Ease apart the two lugs at the side; grip the instrument and withdraw it from
its sleeve; push in the replacement.
5.5 Solid-state Relay Replacement
Remove the top panel as above. The solid state relay is mounted on an aluminium heat sink or on
the bottom of the furnace case. Make a note of how the wires are connected to the solid state relay,
and disconnect them.
Replace and reconnect the solid state relay ensuring that the heat-conducting thermal pad is
sandwiched between the relay and the base panel or aluminium plate. Alternatively a thin layer of
white, heat-conducting silicon paste may be applied between the new relay and the plate.