MRC FIGR-100 Manuale utente

FIGR-100/120

CRYO CHILLER Operating Manual

Before you operate the equipment please read carefully all the

instructions and safety notes. If you hav

e any questions please phone us!

Follow the instructions on setting up, operation etc. This is the only

way to exclude incorrect operation of the equipment and to ensure full

warranty protection.

3,Hagavish st. Israel 58817 Tel: 972 3 5595252, Fax: 972 35594529

[email protected]

MRC.7.20

1、Safety notes

·Transport the equipment with care!

·Careful transportation of the equipment requested !

·The unit may NEVER be overturned nor put upside down !

·Equipment and its internal parts can be damaged :

- by dropping

- by shock.

·Do not start up the equipment if Equipment should only be operated by

properly instructed personnel !

- it is damaged or leaking

- the supply cable is damaged.

·Switch off the equipment and pull out the mains plug for:

- servicing or repair

- before moving the equipment!

·Have the equipment serviced or repaired only by properly qualified

personnel !

·At low temperatures, do not move or bend the insulated flex line tube !

·Be careful not to bend the insulated flex line appreciably after the unit has

chilled down the probe and line.

·The flexible line to the cold probe should have no sharp bends nor signs

of broken tubing.

2、Unpacking

Goods are packed carefully, largely preventing transport damage.

After unpacking , check first the equipment and accessories for possible

transport damage. If unexpectedly any damage can be noticed on the equipment it is

essential to notify the forwarding agent or the postal authorities so that an inspection

can take place.

Do not start operations with damaged equipments!

The unit may NEVER be overturned nor put upside down !

3、Equipment description

Refrigeration unit

The refrigeration unit consists essentially of a fully sealed compressor. The Cryocoil

or Cryoprobe is cooled down to a very low temperatures,through a flexible heat

exchanging tube located on the top of this equipment. Heat of condensation and

motor heat are dissipated on air-cooled units through a fan-cooled ribbed condenser.

The refrigeration unit is protected against overpressure and compressor overload.

with insufficient ventilation of the condenser (e.g. dirt deposits) the equipment is

switched off.

This cooling process is a self-refrigerating cascade type.

A mixture of non-flammable and safe refrigerants is compressed and circulated by a

compressor. In a simplified version, the cycle comprises:

(a) compressing a mixture of refrigerants,

(b) partially condesning the higher boiling fractions in an air-cooled condenser,

the remaining vapors in a special heat exchanger,

(d) throttling and evaporating this latter condensate in a coil to produce cooling at

very low temperatures,

(e) passing the refrigerant leaving the cooling coil back through the heat exchanger

to the compressor.

Basic Auto-Cascade Refrigeration Cycle

Operating pressures and compressor temperatures are similar to those in

air-conditioning systems. The compressor lubricating oil circulated with the discharge

vapors is promptly returned to the compressor without reaching the very low

temperature portions of the system. This eliminates the common problems of oil

plugging in evaporators and expansion devices too frequently experienced in low

temperature systems. The mixed refrigerant charge is hermetically sealed into the

system; normally neither it nor the compressor lubricating oil requires replacement or

recharging.

In this unit, there is a series of intermediate special heat exchangers (cascade

condensers) between the air-cooled condenser and the final cooling coil (cold probe).

There are several stages of partial condensation, phase separation, condensate

throttling, and intermediate cooling. In addition, the system has a suction-side

refrigerant vapor expansion tank and a discharge-side buffer tank to limit start-up

discharge pressures.

Control unit

The control unit with indication and operating functions,

The equipment is provided with a LED display to indicate the measurements and

settings as well as the operational status. The setpoint and other settings are

selected using two or three keys.

A Pt100 temperature probe senses the temperature inside the Cryocoil. The

measurement is processed by a high-resolution AD converter.

4、Brief instructions

4.1 Assembly and setting up

Carefully remove the packaging materials and visually inspect the unit for shipping

damage. The flexible line to the cold probe should have no sharp bends nor signs of

broken tubing. Plug the unit into a suitable power circuit.

It is advisable to set up the equipment so that the control unit is towards the front

and that the ventilation for the refrigeration unit, especially on equipment with

air-cooled condenser, (ventilation grille in lower part) is not impeded. Ensure a

minimum spacing of 0.5 m between ventilation grille and wall.

4.2 Start-up and Operation

Start the unit by turning on the switch. The compressor and condenser fan should

start running. Within about 5-10 minutes, cooling should commence in the cold probe.

if the compressor turns off during initial start up, turn the switch off for 5-10 minutes,

then restart.

It is best not to operate the unit for more than 15 minutes with the cold probe out of a

vacuum system because of moisture accumulation.

Turn off the unit, warm the cold probe and dry it off. Remove the liquid nitrogen cold

trap from the vacuum system and insert the cold probe in its place. Make certain

there are no sharp bends or strains on the flexible insulated line leading to the cold

probe. Rough the vacuum system down. Then turn on the ‘Cryochiller’unit. Be

careful not to bend the insulated flex line appreciably after the unit has chilled down

the probe and line. This can lean to cracks in the insulation. The system may be

operating continuously. It should be turned off any time the fore- or roughing pump(s)

are to be turned off.

4.3 Operating panel

● Basal display status :

When power on, the upper display window of the equipment shows the process

value (PV), and the lower window shows the setting value (SV). This status is called

basal display status. When the input signal is out of the measurable range (for

example, the RTD circuit is break, or input specification sets wrong), the upper

display window will alternately display “HHHH”or “LLLL” and the high limit or the low

limit of PV, and the equipment will automatically stop output.

Key functions

Setup key, for accessing parameter table, and confirming change.

Data shift key, also for activating auto turning

Data increase key

Data decrease key

Display window

PV Process Value Display Displays PV, or code of a parameter

SV Setting Value Display Displays SV, alarming code, or value of a parameter

LED indicator.

OUT Output indicator (Heating for temperature control )

COOLING Cooling indicator

ALARM Alarm or warning indicator (Option )

4.4 Operation discription

● Set Value Setting:

In basal display status, we can set setpoint (SV) by pressing 、、 or .Press

to decrease the value , Press to increase the value, and to move to the

digit expected to modify. Keep pressing or , the speed of decreasing or

inscreasing value get quick.

● Parameter Setting:

In basal display status, press and hold for about 2 seconds can access Field

Parameter Table. Pressing can go to the next parameter; pressing 、or

can modify a parameter. The equipment will escape auomatically from the parameter

table if no key is pressed within 30 seconds.

●Intelligence control and auto tuning

When At control method is chosen, the control parameters can be obtained by

running auto-tuning. At the first time of running auto-tuning, in basic display status,

“At” will flash at lower display window and the equipment executes on-off control.

After 2 to 3 cycles of on-off action, the equipment will obtain the values of PID control

parameters. If you want to escape from auto tuning status, press and hold for

about 2 seconds until the "At" flash stops. Depending on the system, the time of auto

tuning can be several seconds to several hours. After the auto tuning finishes, the

parameter “At” automatically changes to “OFF”, If user wants to run auto tuning

again, setting parameter “At” to “on”.

Note 1: Before running auto-tuning, setpoint should be set to an often-used value or middle

value first, and then start auto-tuning. Generally, for application with heating time of 10%～80%

can obtain satisfying auto-tuning result. If the heating time is not in the range of 10～80%, the

auto-tuning will run for a long time and can’t get satisfying result. Raising setpoint for heating

time less than 10% or decreasing setpoint for heating time greater than 80% can improve

auto-tuning result.

Note 2: Don’t modify the setpoint during auto-tuning. It may affect the precision of auto-tuning.

Note 3: The temperature fluctuation caused by interference may affect the precision of

auto-tuning. Besides checking the wiring, increasing the parameter FILt (input digital filter) can

also reduce interference.

Note 4: After auto-tuning finishes, generally, the temperature rising has a little over-shoot (about

1~3℃). It is because considering that the transducer is often placed between the heater and

heated material, and a little over-shoot can shorten the time of rising to setpoint and save power.

(Generally, the temperature of transducer can be raised quick than that of heated material)

5 Maintenance

5.1 Maintenance and Periodic Inspections

The only component requiring maintenance is the air-cooled condenser. It should be

kept clean enough for free air flow through it. Accumulated dirt or lint may be

removed by brushing,

vacuum cleaning or with a compressed air blow-gun. Inspect the condenser face

about weekly for the first month then monthly the rafter to determine the cleaning

frequency which will be required.

The compressor and condenser fan motors are lifetime lubricated and do not require

regular oiling. If practical, the temperature of the compressor should be checked

every several months by feeling it. It should be possible to hold a hand on top of it for

a few seconds.

Also there should be no frost accumulation on the suction valve on the side of the

compressor.

5.2 Cleaning

Before cleaning the equipment, pull out the mains plug!

The unit can be cleaned with water with the addition of a few drops of a detergent

(washing-up liquid), using a moist cloth.

Water must not enter the control unit

The user is responsible for carrying out an appropriate detoxification of any

dangerous material which has been spilled on or in the unit. This applies in particular

when the unit is passed on to someone else for operation, repair, storage etc..

5.3 Repair and disposal instruction

The refrigeration unit is filled with refrigerant. Repair and disposal must only be

carried out by a qualified refrigeration technician!

Before you return the equipment for servicing it is advisable to contact our Technical

Service department.

If the equipment has to be returned to the factory, please ensure that it is carefully

and properly packed. MRC accepts no responsibility for damage due to

unsatisfactory packing.

5.4 About us

We are available any time for your queries, suggestions and criticism !

3, Hagavish st. Israel 58817 Tel: 972 3 5595252, Fax: 972 3 5594529 [email protected]

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