MRC 1425 User manual

INSTRUCTION MANUAL FOR
Vacuum Oven
1425/1445/1465
PLEASE READ THIS MANUAL CAREFULLY BEFORE OPERATION
3, Hagavish st. Israe 58817 Te : 972 3 5595252, Fax: [phone] mrc@mrc ab.com
MRC.VER.02-10.10

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TABLE OF CONTENTS
SECTION 1.0 RECEIVING AND INSPECTION
SECTION 2.0 GRAPHIC SYMBOLS
SECTION 3.0 INSTALLATION
SECTION 4.0 PRECAUTIONS
SECTION 5.0 CONTROL PANEL OVERVIEW
SECTION 6.0 VACUUM OPERATION
SECTION 7.0 OPERATION
SECTION 8.0 MAINTENANCE
SECTION 9.0 TROUBLESHOOTING
SECTION 10.0 PARTS LIST
UNIT SPECIFICATIONS
SCHEMATICS
These units are general purpose vacuum ovens for professional, industrial or educational
use where the preparation or testing of materials is done at approximately atmospheric
pressure and no flammable, volatile or combustible materials are being heated. These
units are not intended for hazardous or household locations or use.

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SECTION 1
RECEIVING AND INSPECTION
IMPORTANT: READ THIS INSTRUCTION MANUAL IMMEDIATELY.
Your satisfaction and safety require a complete understanding of this unit,
including its proper function and operational characteristics. Be sure operators are
given adequate training before attempting to put unit in service. NOTE: This
equipment must be used only for its intended application; any alterations or
modifications will void your warranty.
1.1 Inspection: The carrier, when accepting shipment, also accepts responsibility for
safe delivery and is liable for loss or damage claims. On delivery, inspect for visible
exterior damage. Note and describe on the freight bill any damage found and enter
your claim on the form supplied by the carrier.
1.2 Inspect for concealed loss or damage on the unit itself, both interior and exterior. If
any, the carrier will arrange for official inspection to substantiate your claim. Save
the shipping crate until you are sure the unit has been delivered in good condition.
1.3 Return Shipment: If for any reason you must return the unit, contact your VWR
representative for authorization. Supply the complete data plate information when
requesting return authorization. Please see the manual cover for information on
where to contact customer service.
1.4 Accessories: Verify that all of the equipment indicated on the packing slip is
included with the unit. Carefully check all packaging before discarding. The model
1425 is equipped with two (2) deep shelves and one (1) shallow shelf. The model
1445 is equipped with two (2) deep shelves, one (1) shallow shelf and four (4)
adjustable feet. The model 1465 is equipped with three (3) shelves and four (4)
adjustable feet.

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SECTION 2
GRAPHIC SYMBOLS
Your oven has been provided with a display of graphic symbols which should help in
identifying the use and function of the available user adjustable components.
2.1. Indicates "AC Power On".
2.2. Indicates "Manual Adjust".
2.3. Indicates “Temperature”.
2.4. Indicates “Over Temperature Safety”.
2.5. Indicates "Vacuum Gauge".
2.6. Indicates "Consult Your Manual".
2.7. Indicates "Vent Valve".

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SECTION 3
INSTALLATION
Local city, county, or other ordinances may govern the use of this equipment. If you have
any questions about local requirements, please contact the appropriate local agency.
Installation may be performed by the end user.
Under normal circumstances these units are intended for use indoors, at room
temperatures between 5°and 40°C, at no greater than 80% relative Humidity (at 25°C)
and with a supply voltage that does not vary by more than 10%. These ovens should not
be operated at an altitude exceeding 2000 meters. Installation category is CAT-II Pollution
Degree 2. Customer service should be contacted for operating conditions outside of these
limits.
3.1 Power Source: The unit power requirements are listed on the data plate. PLUG
THE UNIT INTO A PROPERLY GROUNDED AND RATED RECEPTACLE OF
THE CORRECT STYLE. THE VOLTAGE OF THE RECEPTACLE SHOULD NOT
VARY MORE THAN 10% FROM THE DATA PLATE RATING. A separate circuit
is recommended for this unit to prevent loss of product due to overloading or circuit
failures caused by other equipment.
3.2 Location: When selecting a site for the unit, consider conditions which may affect
performance, such as heat from radiators, ovens, autoclaves, etc. Avoid direct sun,
fast-moving air currents, heating/cooling ducts, and high-traffic areas. To ensure air
circulation, allow a minimum of 15cm between the unit and any walls or partitions
which might obstruct free air flow.
3.3 Lifting / Handling: These units are heavy and care should be taken to use
appropriate lifting devices that are sufficiently rated for these loads. Units should
only be lifted from their bottom surfaces. Doors, handles and knobs are not
adequate for lifting or stabilization. The unit should be completely restrained from
tipping during lifting or transport. All moving parts such as shelves and trays should
be removed and doors need to be positively locked in the closed position during
transfer to prevent shifting and damage.
3.4 Leveling: The unit must sit level and solidly. Model 1425 has four (4) rubber feet
that are already attached to the unit and are not adjustable. Leveling feet are
supplied with models 1445 and 1465 and must be installed in the four holes at the
base of the unit. With the unit standing upright, turn the leveling feet
counterclockwise to raise the level of that corner. Adjust each foot until the unit
stands solid and level. If the unit must be moved, turn the leveling feet in all the way
to prevent damage while moving.

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3.5 Cleaning: The oven was cleaned at the factory, but not sterilized. Remove all
interior parts and clean the inside of the chamber, thoroughly with a solution that is
appropriate for your application. DO NOT USE chlorine-based bleaches or
abrasives as this will damage the stainless steel chamber. DO NOT USE spray
cleaners that might leak through openings and cracks and get on electrical parts or
that may contain solvents that will harm the coatings. Periodic cleaning is strongly
recommended.
WARNING: Never clean the unit with alcohol or flammable cleaners with the unit
connected to the electrical supply. Always disconnect the unit from the electrical
service when cleaning and assure all volatile or flammable cleaners are evaporated
and dry before reattaching the unit to the power supply.
3.6 Shelves: See Figure below. Place items on shelves. DO NOT place items
directly on the floor of the chamber.

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SECTION 4
PRECAUTIONS
NOTE: THIS IS NOT AN EXPLOSION PROOF OVEN
4.1 Do not place or use explosive, combustible, or flammable materials in the oven.
4.2 Do not use sealed containers in the oven chamber.
4.3 Do not cut or remove the ground prong, if present, from the power cord or use an
ungrounded adapter plug.
4.4 Disconnect the unit from the electrical power source before attempting any repairs
or component replacements.
4.5 If a mercury thermometer is used and breakage should occur, make sure all the
spilled mercury is removed from the chamber.
4.6 This oven is NOT suitable for use in Class I, II, or III locations as defined in the
National Electric Code of the United States of America, NFPA 70.
4.7 This oven is not intended, nor can it be used, as a patient connected device.

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SECTION 5
CONTROL PANEL OVERVIEW (Figure 2)
5.1 POWER SWITCH: This is the main power I/O (On/Off) switch. It must be in the
ON position before any systems are operational.
5.2 MAIN TEMPERATURE CONTROL: This is the Main Temperature control
consisting of the digital display and UP/DOWN arrow pads for adjusting set point
temperatures and calibration.
5.3 HEATING LIGHT: This green indicator light is on whenever the MAIN
TEMPERATURE CONTROL has activated the heating elements to reach and
maintain set point.
5.4 CIRCUIT BREAKER/FUSE: This control is completely independent of the MAIN
TEMPERATURE CONTROLLER and guards against any failure which would allow
temperature to rise past the Temperature set point. Setting adjustments for this
control require a flat-edged tool to eliminate accidental changes. The control has a
dial that is marked from 0 to 10 and is adjustable across this scale. If the set point
is exceeded, the Circuit Breaker/Fuse will limit the rise to approximately 10°C
above the set point selected.
5.5 OVER TEMPERATURE LIGHT: This red indicator light is on whenever the
temperature has exceeded the set point of the MAIN TEMPERATURE CONTROL
and the CIRCUIT BREAKER/FUSE is activated and taken control of the oven.
Under normal operating conditions this pilot light should never be on.
5.6 FUSE: This control, mounted on the rear wall next to the power cord, provides
protection for the unit’s electrical circuitry against power fluctuations. The fuse,
when blown, must be replaced before the unit can continue operation.
5.7 VACUUM: This adjustment handle allows opening and closing of the vacuum
valve to an external vacuum pump or system.
5.8 VENTILATION: This adjustment handle controls the vacuum release valve. This
valve must be closed (completely clockwise) when the unit is in the vacuum mode.
5.9 VACUUM GAUGE: This gauge indicates the chamber operating pressure in
millibars.

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Figure 2
1425
1445 & 1465

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SECTION 6
VACUUM OPERATION
6.1 A pump with a pumping capacity four times greater than the chamber volume is
commonly used. When working below vacuums of 1mm, a diffusion type pump will
be needed. See Section 9.0 for chamber capacities
6.2 IT IS IMPORTANT TO USE VACUUM TUBING FOR ALL THE VACUUM
HOOKUPS. OTHER TYPES OF TUBING MAY COLLAPSE AND PREVENT
COMPLETE EVACUATION.
6.3 To Apply Vacuum To The Chamber: Attach the hose from the vacuum pump to
the 3/8" hose connection on back of the oven. Close the VENTILATION valve
(clockwise) and open the VIDE valve. Latch the door shut and start the vacuum
pump. This action will hold the door shut and against the gasket until the pump
creates a vacuum in the chamber. Once a good vacuum seal is accomplished, the
door will hold itself shut and sealed until the chamber is returned to atmospheric
pressure.
6.4 Watch the VACUUM GAUGE and when the required vacuum is obtained, close the
VACUUM valve and turn pump off. The VACUUM GAUGE is calibrated from 1 to
900 millibars with 1013 millibars representing atmospheric pressure. The oven can
be evacuated to pressures as low as 10 microns.
6.5 Vacuum Release: To return the chamber to atmospheric pressure, open the
VACUUM valve very slowly and allow the chamber to re-pressurize. The speed of
pressurizing can be controlled by how much the valve is opened.
NOTE: A 1 inch sealed pipe is provided at the back of the unit. This access port
can be used to plumb the chamber to a larger, faster roughing pump or as a conduit
for other service applications. Any use of this pipe requires the operator to assure
the attachment is vacuum tight.

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SECTION 7
OPERATION
7.1 Power Supply: Connect the service cord to a grounded outlet and switch unit to
the ON position. If supplied with a detachable cord set, plug the female end into
the inlet of the unit and the male end into the supply. Assure that units requiring a
fuse have a fuse installed. This fuse may be at the inlet or part of the cord set male
plug.
7.2 Turn the Circuit Breaker/Fuse control to its maximum position (clockwise).
7.3 Place a certified reference thermometer inside the chamber where it can be easily
viewed through the window. Vacuum down the chamber as described in Section
5.0
7.4 Setting Main Temperature: To enter set point mode on the control, press either
the UP or DOWN arrow pad one time. The digital display will start to blink from
bright to dim. While blinking, the digital display is showing the set point. To change
the set point, use the Up or Down arrow pads. If the arrow pads are not pressed for
five (5) seconds, the display will stop blinking and will read the temperature of the
unit. The Heating Light Cycle light will come on indicating that the oven is heating.
Allow the unit several hours to reach and maintain set point
7.5 Calibrating the Main Temperature: It is recommended that calibration is done
once the unit is installed in its working environment and has been stabile at set
point for several hours. Compare the reading of the reference thermometer with
the digital display. If there is an unacceptable difference, put the display into
calibrate mode by pressing both the UP and DOWN buttons at the same time until
the decimal points start to blink. While blinking, the display can be changed to
match the reference thermometer by pushing the UP or DOWN buttons until the
display reads the correct value. If no buttons are pushed for five (5) seconds the
display will revert back to reading the temperature in the chamber. Allow for the
oven temperature to stabilize again and recalibrate if necessary.
7.6 Setting the Circuit Breaker/Fuse: Once the Main Temperature is stabile at set
point, set the Circuit Breaker/Fuse control. Previously set to its maximum position,
turn the control knob counterclockwise just until the OVER TEMPERATURE LIGHT
comes on. Next turn the control knob clockwise just until the light goes off. Then
turn the control knob clockwise two (2) minor scale divisions on the dial past the
point where the light went out. The Circuit Breaker/Fuse control will now be set
approximately 10°C above the Main temperature set point.

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When starting a new oven, allow the oven to operate two hours, or until it has
started cycling normally before you begin using it.
NOTE: Slight vapor or smoke may occur in the initial heat-up. This is the
dissipation of protective coatings that have been added to the oven elements.

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SECTION 8
MAINTENANCE
NOTE: Prior to any maintenance or service on this unit, disconnect the service
cord from the power supply.
8.1 Cleaning: Disinfect the oven interior on a regular basis. to prepare the oven for
cleaning remove the shelves and door gasket. The shelves and door gasket are
autoclavable. When washing the gasket, handle carefully so as not to impair the
positive seal.
First, clean the removed parts and interior with soap and water. To decontaminate
use a disinfectant that is suitable for your application. DO NOT USE chlorine-
based bleaches or abrasives as this will damage stainless steel surfaces. DO NOT
USE spray cleaners that might leak through openings and cracks and get on
electrical parts or that may contain solvents that will harm the coatings.
WARNING: Never clean the unit with alcohol or flammable cleaners with the unit
connected to the electrical supply. Always disconnect the unit from the electrical
service when cleaning and assure all volatile or flammable cleaners are evaporated
and dry before reattaching the unit to the power supply.
8.2 Storage: if the oven is to be shut down for storage or transporting, remove
shelves, dry chamber and latch door closed. Screw the leveling feet in. See
Section 2.3 for transport procedures.
8.3 There is no maintenance required on the electrical components. If the oven fails to
operate as specified, see troubleshooting before calling for service.

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SECTION 9
TROUBLESHOOTING AND SERVICE
TEMPERATURE
Temperature too high
1/ controller set too high-see SECTION 6.4
2/ controller failed on – call Customer Service
3/ wiring error – call Customer Service
Display reads "HI" or "400"+
probe is unplugged, is broken or wire to sensor is broken –
trace wire from display to probe; move wire and watch
display to see intermittent problems
Chamber temperature spikes over
set point and then settles to set
point
recalibrate – see section 6.5
Temperature too low
1/ Controller set too low – see section 6.6
2/ Main control set too low – see section 6.4
3/ unit not recovered from door opening – wait for display to
stop changing
4/ unit not recovered from power failure or being turned off
5/ element failure – see if Heating light is on; compare
current draw to data plate
6/ Main controller failure – confirm with front panel lights
that controller is calling for heat
7/ Controller failure – confirm with front panel lights that
circuit breaker/fuse is operating correctly
8/ wiring problem – check all functions and compare wiring
to wiring schematic in manual - especially around any areas
recently worked on
9/ loose connection – check shadow box for loose
connections
Display reads "LO"
1/ Main sensor is plugged in backwards – reverse sensor
wires to controller
2/ if ambient room temperature is lower than range of unit –
compare set points and ambient temperature to rated
specifications in section 9.0, Unit Specifications
Unit will not heat over a
temperature that is below set point
1/ confirm that Controller set point is set above the Main
Temperature set point and that the reset switch has not
been activated
2/ check connections to sensor

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3/ check calibration – using independent thermometer,
follow instructions in section 6.5
Unit will not heat up at all
1/ verify that controller is asking for heat by looking for
Heating light – if pilot light is not on continuously during
initial start up, there is a problem with the controller
2/ check amperage – amperage should be virtually at
maximum rated (data plate) amperage
3/ do all controller functions work?
4/ is the Controller set high enough? – for diagnostics,
should be fully clockwise with the Over Temperature light
never on
5/ has the fuse blown? Check fuse at inlet.
6/ Units will need at least some vacuum in chamber to keep
unit air tight - verify with Vacuum Gauge is above “0”
Indicated chamber temperature
unstable
1/ ± 1. may be normal
2/ is ambient room temperature radically changing – either
door opening or room airflow from heaters or air
conditioning ? – stabilize ambient conditions
3/ sensor miss-located, damaged or wires may be
damaged - check mounts for Main and Controller sensors,
then trace wires or tubing between sensors and controls
4/ calibration sensitivity – call Customer Service
5/ Controller set too low – be sure that it is more than 5
degrees over desired set point; check if Over Temperature
light is on continuously; turn controller knob completely
clockwise to see if problem solved then follow instructions in
section 6.6 for correct setting
6/ electrical noise – remove nearby sources of RFI
including motors, arcing relays or radio transmitters
7/ bad connection on temperature sensor or faulty sensor –
check connectors for continuity and mechanical soundness
while watching display for erratic behavior; check sensor
and wiring for mechanical damage
8/ bad connections or faulty solid state relay – check
connectors for mechanical soundness and look for corrosion
around terminals or signs of arcing or other visible
deterioration
Will not maintain set point
1/ assure that set point is at least 5 degrees over ambient
room temperature
2/ see if ambient room temperature is fluctuating
Display and Reference
thermometer don’t match
1/ calibration error – see section 6.6
2/ Main temperature sensor failure – evaluate if Heating
light is operating correctly
3/ Main controller failure – evaluate if Heating light is

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operating correctly
4/ allow at least two hours to stabilize
5/ verify that reference thermometer is certified
Can't adjust set points or
calibration
1/ turn entire unit off and on to reset
2/ if repeatedly happens, call Customer Service
Calibrated at one temperature, but
not at another
This can be a normal condition when operating temperature
varies widely. For maximum accuracy, calibration should be
done as close to the set point temperature as possible.
MECHANICAL
Glass door not sealing
1/ check physical condition of gasket
2/ assure that gasket clamps are in original location
Outer door not sealing
1/ see if hinges are out of adjustment
2/ Confirm that unit has not been damaged and body is not
out of square.
Oven won’t hold vacuum
1/ check door gasket for alignment and damage, wear or
lack of compliance
2/ assure all vent and feed valves are closed tightly
3/ assure tight connections to pump
OTHER
controller on at all times - "locked-
up"
1/ turn unit off and on to reset
2/ if cannot change any condition on the front panel, call
Customer Service
front panel displays are all off
1/ check connections to the temperature display control
board and assure that all are tight and in the correct
orientation.
2/ Check for wire damage.
unit or wall fuse/circuit breaker is
blown
1/ check wall power source
2/ compare current draw and compare to specs on data
plate
3/ see what other loads are on the wall circuit
unit will not turn on
1/ check wall power source
2/ check fuse/circuit breaker on unit or in wall
3/ see if unit is on, e.g., heater, and just controller is off
4/ check all wiring connections, esp. around the on/off

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switch.
Unit is smoking – Out of box
This is not uncommon during initial operation. Put unit
under vent and run at full power for one hour.
Contamination in chamber
1/ see cleaning procedure in operator’s manual
2/ develop and follow standard operating procedure for
specific application; include definition of cleaning technique
and maintenance schedule
If this product should require service, contact yourGLstributor. If return of the product be
necessary, an authorization number must be obtained and the product shipped according to your
representative, to the proper service center. To insure prompt handling, the return authorization number
should be placed on the outside of the package or container. Make sure a detailed explanation of the
reason for return is enclosed with the item.

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SECTION 10
PARTS LIST
Description 115V 220V
Controller knob 4450506 4450506
Circuit Breaker, 15A N/A 1100505
Outer Door Glass 1425
1445
1465
3550522
3550521
3550523
3550522
3550521
3550523
1425
Door Glass 1445
1465
700027
110107
3550586
700027
110107
3550586
1425 / 1445
Elements 1465 upper lower
1465 sides
9570741
9570740
9570729
9570786
9570740
9570729
EMI Filter, 10 AMP N/A 2800502
Fuse, 10 AMP 3300502 N/A
Fuse, 6.3 AMP - 250V N/A 103555
Fuse Holder 3300501 N/A
1425
Inner Door Gasket 1445
1465
3450508
3450509
3450510
3450508
3450509
3450510
Outer Door Gasket 600002 600002
I/O Switch 103351 103351
Pilot Light, green 200021 200021
Pilot Light, red 200020 200020
Power Cord 1800516 X1000778
RTD / Probe 103070 103070
Safety Controller 1750648 1750648
Solid State relay 101168 101168
Temperature Controller 1750607 1750607
Vacuum Gauge 9990618 9990618
Ventilation Valve 8600531 8600531
Vacuum Valve 8600531 8600531

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UNIT SPECIFICATIONS
Weight Shipping Net
1425 145 lbs. 105 lbs.
1445 220 lbs. 179 lbs.
1465
Dimensions Exterior W x D x H
(in.)
Interior W x D x H
(in.)
1425 17 x 22.3 x 23.5 9 x 12 x 9
1445 20.5 x 28.2 x 26.25 12 x 20 x 12
1465 18 x 24 x 18
Capacity Cubic Feet
1425 0.6
1445 1.7
1465 4.5
Temperature Range Sensitivity
1425
1445
1465
Amb. +5°to 240°C 1.0°C
MODEL VOLTS AMPS VA CYCLE
1425 120V AC 4.3 500 50/60hz
220V AC 2.3 500 50/60hz
1445 120V AC 8.7 1000 50/60hz
220V AC 4.5 1000 50/60hz
1465 120V AC 13 1500 50/60hz
220V AC 6.8 1500 50/60hz

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WIRE DIAGRAM