VERDER CARBOLITE GERO CDHT 450 Handbuch

Installation, Operation and Maintenance Instructions

200°C Coal Drying Oven - CDHT Model: 450 Litres

No Controller

CDHT 450 + No Controller

MEN-CDHT450-005_NOCTRL (18-10-2021)

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 5

2.1 Unpacking and Handling 5

2.2 Siting and Setting Up 5

2.3 Electrical Connections 6

3.0 Temperature Controller 8

4.0 Operation 9

4.1 Operating Cycle 9

4.2 Over-Temperature Control (if fitted) 9

4.3 Explosive Vapours 9

4.4 Coal Drying Application 10

5.0 Maintenance 11

5.1 General Maintenance 11

5.2 Maintenance Schedule 11

5.2.1 Cleaning 13

5.3 Calibration 13

5.4 After-Sales Service 13

5.5 Recommended Spare Parts and Spare Parts Kit 13

5.6 Power Adjustment 13

6.0 Repairs and Replacements 15

6.1 Safety Warning - Disconnection from Power Supply 15

6.2 Safety Warning - Refractory Fibre Insulation 15

6.3 Panel Removal 15

6.4 Temperature Controller Replacement 16

6.5 Fuse Replacement 16

6.6 Element Replacement 17

6.7 Thermocouple Replacement 17

6.8 Solid-state Relay Replacement 17

7.0 Fuses and Power Settings 18

7.1 Fuses 18

7.2 Power Settings 18

8.0 Fault Analysis 19

A. Oven Does Not Heat Up 19

B. Oven Overheats 19

9.0 Wiring Diagrams 20

10.0 Specifications 21

10.1 Environment 21

1.0 Symbols and Warnings

1.1 Switches and Lights

Instrument switch: when the instrument switch is operated the

temperature control circuit is energised.

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.

DANGER – Read any warning printed next to this symbol.

Caution – Double Pole/Neutral Fusing

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 6.2.

2.2 Siting and Setting Up

Note: This LGP oven is supplied with a floor stand that elevates it approximately 500

mm off the ground.

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.

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.

Some models may be ordered for 3-phase use, which may be star or delta.

Check the product rating label before connection. The supply voltage should agree with

the voltage on the label and the electrical supply capacity should be sufficient for the

current on the label.

A table of the most common fuse ratings is also given in section 7.0 towards the back

of this manual. Ensure that the correct fuse is used for the product supplied. When the

mains cable is factory fitted internal fuses are also fitted. Customer fusing is essential.

Product with supply cable: either wire directly to an isolator or fit with a line plug.

Product without supply cable: a permanent connection to a fused and isolated supply

should be made to the internal terminals after temporary removal of the product

access panel. The access panel is located at the top of the 'A' models and the right

hand side of the 'B' models.

Connection by line plug: the plug should be within reach of the operator and should be

easy to remove.

Connection to isolating switch: this should operate on both conductors (single phase)

or on all live conductors (three phase), and should be within reach of the operator.

The electrical supply MUST incorporate an earth (ground).

Supply Terminal Label Cable Colour

Supply Types

Live - Neutral Reversible or Live-

Live

1-phase L1 Brown to live

to either power

conductor

(For USA 200-240V,

connect L1)

N / L2 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:

3-phase L1 Black to phase 1

L2 Black to phase 2

L3 Black to phase 3

N Light Blue to neutral (except delta)

PE Green/ Yellow to earth (ground)

DO NOT connect a product ordered for three phase use to a single

phase supply or to the wrong type of three phase supply.

3.0 Temperature Controller

If this product is fitted with a temperature controller, instructions are provided

separately.

4.0 Operation

4.1 Operating Cycle

The product is fitted with an instrument switch. The switch cuts off power to the

controllers and elements. The circulation fan will operate when the instrument switch is

on. An optional door switch may be fitted. If so, ensure that the door is closed to

operate the fans and heating elements.

Turn on the instrument switch to activate the temperature controllers. The controllers

illuminate and go through a short test cycle.

Over-Temperature option only. If the digital over-temperature option has not yet

been set as required, set and activate it according to the over-temperature controller

instructions.

The product will heat up according to the controller setpoint or program, unless a time

switch is fitted and switched off.

Over-Temperature option only. If the over-temperature circuit has tripped, an

indicator on the over-temperature controller flashes and the heating elements are

isolated. Find and correct the cause before resetting the over-temperature controller

according to the instructions supplied.

To switch the product off, turn off the instrument switch. If the product is to be left

unattended, isolate the electricity supply.

DO NOT switch off if the temperature is above 100 °C - damage could be caused to the

fan and motor. Adjust the controller to allow the temperature to fall.

4.2 Over-Temperature Control (if fitted)

The over-temperature controller should typically be set at 15 °C above the main

controller. If an over-temperature condition occurs, check the main controller is

functioning correctly.

An over-temperature condition cuts off power to the heating elements. A light in the

over-temperature controller flashes. To reset this, refer to the over-temperature

control section of this manual.

4.3 Explosive Vapours

Unless your product includes the stoving and curing option, this

model is not suitable for drying or heat treatment applications where

vapours are released that are combustible or which can form

explosive mixtures with air. Carbolite Gero manufactures other

products suitable for these applications.

4.4 Coal Drying Application

The CDHT is designed to operate at typically 150°C - 200°C to dry and test coal

samples in accordance with international standards.

The oven has air inlet and outlet vents designed to ensure a constant flow of fresh air

to dry the samples and carry moisture away.

Open the inlet and outlet vents to the minimum amount required to ensure consistent

drying results.

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