Carbolite Gero Ashing Furnace AAF 11/7

Wear an anti-static wrist strap

Avoid any possibility of damage by static electricity

Remove screws to separate controller from base

Ease apart the two lugs at the side

Grip the instrument and withdraw it from its sleeve

Push in the replacement controller

Disconnect the furnace from the supply

Solid-state Relay Disconnection

Note how the wires are connected to the solid state relay

Disconnect the wires from the solid state relay

Remove the solid state relay from the base panel or aluminium plate

Disconnect the furnace from the supply

Note the thermocouple connections

Verify thermocouple and cable color coding

Disconnect the thermocouple from its terminal block

Remove soot deposits as mentioned in section 3.3

Replace consumable items if necessary

Clean the furnace outer surface with a damp cloth

Ensure no water enters the interior of the case or chamber

Avoid cleaning with organic solvents

Check if the controller and/or thermocouple require recalibration after prolonged use

Perform a quick check using an independent thermocouple and temperature indicator

Lift the furnace door to the open position

Remove the door cover from the plug carrier assembly

Remove the old door plug by sliding it upwards out of its carrier

Slide the new plug into the carrier assembly ensuring it is the correct way up

Ensure that the ventilation is good when first heating the furnace after replacement