Installation, Operation & Maintenance Instructions Clean Room Ovens CR models This manual is for the guidance of operators of the above Carbolite products and should be read before the oven is connected to the electricity supply. CONTENTS Section 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.
Clean Room Ovens 1.0 SYMBOLS & WARNINGS 1.1 Switches and Lights Instrument switch: when the instrument switch is operated the temperature control circuit is energised. 1.2 Warning Symbols DANGER of electrical shock– read any warning printed by this symbol. DANGER – hot surface. Read any warning printed by this symbol. WARNING: all surfaces of an oven may be hot. DANGER – read any warning printed by this symbol. 2 MF21 – 3.
Clean Room Ovens 2.0 INSTALLATION 2.1 Unpacking & Handling Lift the unit by its base. Do not use the door or any other projecting cover or component to support the equipment when moving it. Use two or more people to carry the oven where possible. Remove any packing material from the inner chamber before use, and locate the shelves as required. Larger models: the unit may be lifted by a fork lift truck from the front or back.
Clean Room Ovens 3.0 OPERATION The instructions for operating the temperature controller are given in a separate manual. If the oven is fitted with a time switch, see also the supplementary manual MS03. If cascade control is fitted, see the supplementary manual MS07. If the oven has variable speed fan, air extraction or stoving and curing options, please also see the appropriate section on the next page of this manual. 3.1 Operating Cycle The oven is fitted with an Instrument switch.
Clean Room Ovens 3.5 Variable Speed Fan Option When this is ordered, or in any model where it is supplied as standard, a variable speed control is fitted in the fan circuit. Operation of the rotary control is self-explanatory. Please note that there is a minimum setting at which the fan motor starts up when the oven is switched on. Find this setting by experiment, and mark the position on the control or front panel.
Clean Room Ovens 4.0 MAINTENANCE 4.1 General Maintenance No routine maintenance is required other than the occasional replacement of consumable items. The oven outer surface may be cleaned with a damp cloth. Do not allow water to enter the interior of the case. Do not clean with organic solvents. The fan motor is sealed for life; no lubrication is required. Lightweight ceramic fibre insulation can easily be marked by accidental contact.
Clean Room Ovens 5.0 REPAIRS & REPLACEMENTS 5.1 Safety Warning – Disconnection from Supply Always ensure that the oven 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.
Clean Room Ovens The new solid state relay contains a built-in MOV which protects it from short periods of excess voltage. If the old relay had a separate disc-shaped "MOV" connected between the high voltage terminals of the old relay, discard the old MOV. Replace the removed panel. 5.6 Thermocouple Replacement Remove the appropriate cover or control panel and the internal cover as given above. Make a note of the thermocouple connections, and how the thermocouple is placed and fixed.
Clean Room Ovens 6.0 FAULT ANALYSIS A. Oven Does Not Heat Up 1. The temperature controller is OFF 2. The temperature controller is ON B. Oven Overheats 1. Oven only heats up when the instrument switch is ON 2. Oven heats up when the instrument switch is OFF MF21 – 3.07 No power from the supply There are no lights glowing on the controller The controller shows a very high temperature or a code such as S.
Clean Room Ovens 7.0 CIRCUIT DIAGRAMS 7.1 Single Phase N L only if overtemperature control fitted F1 Filter (if fitted) relay or contactor F2 PE e l e m e n t (s) Instrument Switch circulation fan coil overtemp. controller thermocouple SSR temperature controller thermocouple 7.
Clean Room Ovens 7.3 Three Phase without Neutral (delta e.g. 208-240V) if overtemperature control fitted Filter F1 L3 L2 L1 PE F2 e l e m e n t (s) contactor Instrument Switch e l e m e n t (s) e l e m e n t (s) SSR instrument and fan circuit as above SSR SSR 7.4 Three phase without Neutral (star – e.g. 380-415V) The circuit is similar to 7.4, but the “neutral” ends of the elements are not connected to a neutral terminal block.
Clean Room Ovens 7.6 Stoving & Curing The following addition is made to the circuit. element circuit Relay or Contactor control circuit Fan Motor exhaust Fan Fault light o/temp if fitted Pressure Switch 12 COIL MF21 – 3.
Clean Room Ovens 8.0 FUSES & POWER SETTINGS 8.1 Fuses F1-F2: Refer to the circuit diagrams. F1 Internal supply fuses F2 Auxiliary circuit fuses Customer fuses 8.2 Fitted if supply cable fitted. on-board and up to 16 Amps: Fitted on board to some types of EMC filter. 32mm x 6mm type F other: GEC Safeclip Fitted on board to some types of EMC filter. 2 Amps glass type F May be omitted up to 25Amp/phase supply On board: 20mm x 5mm rating. Other: 32mm x 6mm Required if no supply cable fitted.
Clean Room Ovens 9.0 SPECIFICATIONS 9.1 Carbolite reserves the right to change specifications without notice. Models Covered by this Manual MODEL Max. Temp. Max. Power (°C) (kW) Chamber Size (mm) H Clean Room Ovens CR/30 250 1 310 CR/70 250 1.5 310 CR/130 250 2 550 CR/180 250 2.25 770 CR/220 250 3 610 CR/330 250 4.5 915 CR/450 250 6 1220 Also larger models – details on application 9.2 Approx.
Clean Room Ovens MF21 – 3.
The products covered in this manual are only a small part of the wide range of ovens, chamber furnaces and tube furnaces manufactured by Carbolite for laboratory and industrial use. For further details of our standard or custom built products please contact us at the address below, or ask your nearest stockist.
