VERDER CARBOLITE GERO LHT 4/30 Manual

Installation, Operation and Maintenance Instructions
400°C Laboratory High Temperature Oven - LHT Model: 30 Litres
No Controller
LHT 4/30 + No Controller
MEN-LHT4030-006_NOCTRL (06-08-2019)

Contents
This manual is for guidance on the use of the Carbolite Gero product specified on the
front cover. This manual should be read thoroughly before unpacking and using the
furnace or oven. The model details and serial number are shown on the back of this
manual. Use the product for the purpose for which it is intended.
1.0 Symbols and Warnings 4
1.1 Switches and Lights 4
1.2 General Warnings 4
2.0 Installation 6
2.1 Unpacking and Handling 6
2.2 Siting and Setting Up 6
2.3 Electrical Connections 7
3.0 Temperature Controller 9
4.0 2132 Over-Temperature Controller Description (if fitted) 10
4.1 Description 10
4.2 Operation 10
4.2.1 Controls 10
4.2.2 Operation 11
4.2.3 Over-Temperature Operation 11
4.2.4 Over-Temperature Alarm 11
4.2.5 Resetting the Over-Temperature Alarm 11
4.2.6 Sensor Break 11
4.3 Audible Alarm 12
4.4 Navigation Diagram 12
5.0 Operation 13
5.1 Operating Cycle 13
5.2 Over-Temperature Control (if fitted) 13
5.3 Explosive Vapours 13
5.4 Atmospheres 14
5.5 Operator Safety 14
5.6 Solenoid Valve with Manual Switch (if fitted) 14
5.7 Variable Speed Fan (if fitted) 15
5.8 Exhaust Fan (if fitted) 15
5.9 Stoving and Curing (if fitted) 15
5.9.1 Pre-heater (if fitted) 15
6.0 Maintenance 16
6.1 General Maintenance 16
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6.2 Maintenance Schedule 16
6.2.1 Cleaning 18
6.3 Calibration 18
6.4 After-Sales Service 18
6.5 Recommended Spare Parts and Spare Parts Kit 18
6.6 Power Adjustment 18
7.0 Repairs and Replacements 20
7.1 Safety Warning - Disconnection from Power Supply 20
7.2 Safety Warning - Refractory Fibre Insulation 20
7.3 Panel Removal 21
7.3.1 Side Panel 21
7.3.2 Internal Element Cover 21
7.4 Temperature Controller Replacement 22
7.5 Solid-State Relay Replacement 22
7.6 Thermocouple Replacement 22
7.7 Element Replacement 22
8.0 Fault Analysis 23
A. Oven Does Not Heat Up 23
B. Oven Overheats 23
9.0 Wiring Diagrams 24
9.1 WV-11-01 24
9.2 WS-10-01 - Isolating for 208 V version only 25
10.0 Fuses and Power Settings 26
10.1 Fuses 26
10.2 Power Settings 26
11.0 Specifications 27
11.1 Environment 27
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1.0 Symbols and Warnings
1.0 Symbols and Warnings
1.1 Switches and Lights
Instrument switch: when the instrument switch is operated the
temperature control circuit is energised.
Solenoid valve (if fitted): see section 5.6 for full details
Variable speed fan (if fitted): see section 5.7 for full details
Exhaust fan (if fitted): see section 5.8 for full details
Stoving and curing (if fitted): see section 5.9 for full details
1.2 General Warnings
DANGER – Electric shock. Read any warning printed next to this
symbol.
WARNING: Risk of fatal injury.
DANGER – Hot surface. Read any warning printed next to this
symbol.
WARNING: All surfaces of a product may be hot.
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DANGER – Read any warning printed next to this symbol.
Caution – Double Pole/Neutral Fusing
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1.0 Symbols and Warnings

2.0 Installation
2.0 Installation
2.1 Unpacking and Handling
When unpacking or moving the product, always lift by its base; do not use the door or
any other projecting cover or component to support the equipment when moving it. Use
a fork lift or pallet truck to move the product; position the product on a level surface and
use an adequate number of personnel to safely move the product into position.
Carefully remove any packing material from inside and around the product before use.
Avoid damaging the surrounding insulation when removing packing materials.
Locate the shelves as required.
Some models may be lifted by fitting lifting bolts to captive threads which are fitted in
the top of the case, whilst others may have welded on lifting eyes.
NOTE: This product contains Refractory Ceramic Fibre (also known as
Alumino Silicate Wool - ASW). For precautions and advice on handling
this material see section 7.2.
2.2 Siting and Setting Up
Place the product on a level surface in a well ventilated area.
Site away from other sources of heat and on a non-flammable surface that is resistant
to accidental spillage or hot materials.
The surface on which the equipment is mounted should be stable and not subject to
movement or vibrations.
The height of the mounting surface is important to avoid operator strain when loading
and unloading samples.
Unless otherwise stated elsewhere in this manual, ensure that there is at least 150
mm of free space around the back and sides of the product. Clear space is required
above the product to dissipate heat.
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Depending on the application of the product, it may be appropriate to position it under
an extraction hood. Ensure the extraction hood is switched on during use.
Ensure that the product is placed in such a way that it can be quickly switched off or
disconnected from the electrical supply.
Under no circumstances should any objects be placed on top of the product.
Always ensure that any vents on the top of the product are clear of any
obstruction. Always ensure all cooling vents and cooling fans (if fitted) are
clear of any obstruction.
2.3 Electrical Connections
Connection by a qualified electrician is recommended.
This product requires a single-phase A.C. supply with earth (ground), which may be Live
to Neutral non-reversible (polarised), Live to Neutral reversible (non-polarised), or Live
to Live.
Check the product rating label before connection. The supply voltage should agree with
the voltage on the label and the supply capacity should be sufficient for the current on
the label.
The supply should be fused at the next size equal to, or higher than the current on the
label. A table of the most common fuse ratings is also given towards the back of this
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2.0 Installation

2.0 Installation
manual. When the mains cable is factory fitted, internal fuses are also fitted. It is
essential that the operator ensures that the product is correctly fused.
Products with a factory fitted supply cable are designed to be wired directly to an
isolator or fitted with a line plug.
Products without a factory fitted supply cable require a permanent connection to a fused
and isolated supply. The product's electrical access panel should be temporarily
removed, and connections made to the internal terminals.
If the product is to be connected by line plug. The plug should be within reach of the
operator and should be easy to remove.
When connecting the product to an isolating switch ensure that both conductors (single
phase) or on all live conductors (three phase), and should be within reach of the
operator.
The supply MUST incorporate an earth (ground).
Supply Terminal Label Cable Colour
Supply Types
Live - Neutral Reversible or Live-
Live
1-phase L Brown to live
to either power
conductor
(For USA 200-240V,
connect L1)
N Blue to neutral
to the other power
conductor
(For USA 200-240V,
connect L2)
PE Green/ Yellow to earth
(ground) to earth (ground)
Electrical Connection Details:
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3.0 Temperature Controller
If this product is fitted with a temperature controller, instructions are provided
separately.
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3.0 Temperature Controller

4.0 2132 Over-Temperature
4.0 2132 Over-Temperature Controller Description (if
fitted)
4.1 Description
Key
A Alarm Light
B Page
C Scroll
D Down
E Up
F Display
This over-temperature controller is fitted and supplied ready to use by Carbolite Gero.
It is a digital instrument with a latching alarm, requiring no additional panel controls.
The controller features easy setting of over-temperature setpoint and reading of current
temperature by the over-temperature sensor.
4.2 Operation
4.2.1 Controls
Most Carbolite Gero products are fitted with an instrument switch which cuts off power
to the controller and other parts of the control circuit.
To operate the controller, power must be supplied to the product and the instrument
switch must be on. If a time switch is included in the product circuit, this must be in the
'ON' position.
When an over-temperature condition occurs, the controller cuts the power to a
contactor, which in turn cuts power to the heating elements. Power is not restored until
the controller is 'reset'.
Some components will operate after the over-temperature feature isolates the power
supply e.g. cooling fans will continue to operate, provided that there is a power supply
to the product. In some cases the product may not do so, if other options (such as a
door switch) are fitted.
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