MRC DFO-720 User manual

Operation manual for
DFO –DFI
Series

Unpacking and Handling
Remove the shelves and runners from the packaging before attempting to move the equipment
When unpacking and handling the product, always lift it 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 product where possible
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 and runners as required
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
General Overview
Ensure that the product is placed in such a way that it can be quickly switched off or disconnected from the
. electrical supply
.Some models have protruding fan motor housings: these housings must be in an area of good ventilation

Main Temperature Controller
Number Key Description / Function
③For setting and calling up parameters.
④To increase the value of digits.
⑤To decrease the value of digits.
⑥R Revert /STOP/Restart Timer (For machine with timer use
only)
⑦PV To display process value, menu symbol and error code.
⑧SV To display set point value, parameter value or control output
value.
⑨C Process Unit Indicator- Celsius
⑩ALM 123
Indicator Over-Heat Temperature. Lights on when actual temperature over the set temperature
5℃, and turns off the heater.
⑪OUT 1 2 Control output lamp 1.
Light on when heater is activated
⑫MANU Lamp flashes during Manual Mode operates
⑬COMM Communication indicator
⑭TUNE Lamp flashes during auto-tuning operates
⑮Lock indicator
Setting parameter
The PV display indicates the parameter symbol, and the SV display indicates the
selected value of the selected parameter.
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

Setting the Temperature (Continuous mode)
Put the front switch on CONTINUES
Turn on the temperature controller/power switch. The temperature displays light up
and after a few seconds, the upper display shows the present value (PV) temperature.
The lower display shows the set value (SV) or set temperature.
Press to increase temperature gradually.
Press to decrease temperature gradually.
Setting the Temperature (timer mode)
Put the front switch on TIMER
Turn on the temperature controller/power switch. The temperature displays light up
and after a few seconds, the upper display shows the present value (PV) temperature.
The lower display shows the set value (SV) or set temperature.
Press to increase temperature gradually.
Press to decrease temperature gradually.
Press number ③twice. PV display , SV display 1.0
Press to increase or decrease time gradually. Setting time upon what you
need.
The timer will start from the temperature reach setting.
For example:
1.5 = 90 seconds (1.5 minutes), 1.0 = 60 seconds (1.0 minutes) 0.5 = 30 seconds.
Press number ③once. PV display , and SV display 1.0 →It mean the time
will counting down 1 min after temperature reach to the setpoint.

Electrical Connections
Connection by a qualified electrician is recommended
All models covered by this manual may be ordered for single phase A.C. supply, which
may be Live to Neutral non-reversible, Live to Neutral reversible 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. This manual contains a table of the most common fuse ratings
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
When connecting the product to the power supply, the plug or isolating switch should be
accessible, easy to remove, and within reach of the operator
(The supply MUST incorporate an earth (ground
Electrical Connection Details
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)
It is highly recomended that any time working with the oven use high temp. gloves
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
Atmospheres
When an optional gas inlet is fitted, there is a label near the inlet saying "INERT GAS
ONLY". In practice, inert or oxidising gases may be used, but not combustible or toxic
gases

Door Switch (if fitted
If ordered, the door switch will isolate the heating elements and circulation fan. The door switch is
operated when the door is opened causing the heating elements and air circulation fan to be switched
off
Maintenance
QUALIFIED PERSONNEL
DANGER! ELECTRIC SHOCK. Risk of fatal injury. Only electrically qualified personnel should
attempt these maintenance procedures