GymnaUniphy Cryoflow 700, Cryoflow 1000 User manual

Service Manual

cryoflow 700/1000

Copyrigh© GymnaUniphy NV, 2003
cryoflow® is a registered trademark of NV
Art. Code 300.219 to 300.224 and 300.275

GymnaUniphy NV
Pasweg 6A, 3740 Bilzen, Belgien
Phone [phone] Fax [phone]
www.gymna-uniphy.com e-mail: [e-mail]

Revision directory

Date Rev. From

device
No.:

Changes/remarks

Enclosures

Wiring plan 989.030 Sp Bl 1 "Cryoflow 700/1000 Unit Wiring" Rev. 1.3
Wiring plan 989.030 Sp Bl 2 "Cryoflow 700/1000 Keyboard" Rev. 1.4
Drawing "Keyboard circuit card (A200)", 09.06.03
Drawing "Block diagram Cryoflow 700/1000" 26.05.03
Drawing "Disassembling housing/treatment tube" 06.06.03
Drawing "Tube connection, device" 10.06.03
Drawing "Handle" 10.06.03
Drawing "Power unit PT 45 C" 06.06.03
Drawing "Valve cooling circuit" 06.06.03

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CONTENTS Page

1.

General remarks....................................................................................................................... 4

2. Technical data .......................................................................................................................... 5

3. Functional description .............................................................................................................. 6

3.1 Cold circuit ............................................................................................................................ 6

3.2 Regulating coldness .............................................................................................................6

3.3 Cold air control ..................................................................................................................... 6

3.4 De-icing................................................................................................................................. 7

3.5 Measuring fill level ................................................................................................................ 7

4. Errors........................................................................................................................................ 8

5. Assembling/disassembling..................................................................................................... 10

5.1 Opening the device............................................................................................................. 10

5.2 Electronic sub-assemblies.................................................................................................. 11

5.3 Treatment tube ................................................................................................................... 11

5.3.1 Replacing treatment tube................................................................................................ 11

5.3.2 Aligning silicone tube ...................................................................................................... 11

5.4 Cold circuit .......................................................................................................................... 13

6. Settings................................................................................................................................... 14

6.1 Power supply unit voltage .................................................................................................. 14

6.2 Valve on heat exchanger.................................................................................................... 14

6.3 Temperature sensor ........................................................................................................... 15

7. Functional control ................................................................................................................... 17

8. Safety tests............................................................................................................................. 18

9. Maintenance instructions ....................................................................................................... 19

10. Measuring devices, tools and consumables (summary) ................................................... 20

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1. General remarks

Cryoflow 700/1000 is a mobile therapeutic device, which with the help of a compressor cools a

heat exchanger. Room air is blown by this heat exchanger and it is cooled to

-30 °C. This cold air gets to the skin surface of patients to be treated via flexible tube.

Only accessories and spare parts, listed in the corresponding documentation for Cryoflow
700/1000 (for example, instructions for use, spare part list, price lists) can be used. The actual
prices for accessories and spare parts can be obtained from suppliers.

The Cryoflow 700/1000 cannot be transported over longer distances, while lying, to avoid
damages to the cooling circuit or compressor. There are no problems with normal transport on
the rolls of the device of tilting or lying the device down for short periods. Each time that the
device has been laid down, you must wait at least 30 minutes before turning it on.

Before putting the Cryoflow 700/1000 into operation, read the instructions for use carefully.
Power supply can only take place to a correctly installed isolated ground socket.

Before opening, the device is to be removed from the mains voltage.

Service work, including opening of the device can only be done by people, authorized by the
manufacturer.

We continuously try to keep our products in line with state-of-the art technology. Thus, we
reserve the right to make changes.

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2. Technical data

Power supply 230 V ± 10 %, 50/60 Hz
115 V ± 10 %, 50/60 Hz

External electrical fuses 16 A at 230 V
20 A at 115 V

Device fuse T10 A E at 230 V
T16 A H at 115 V

Power consumption max. 1000 VA

Protective category I

Protective type Type B

Degree of protection IP 21

Treatment duration Time operation: 1 to 595 minutes, permanent operation

Air adjustment 10 steps

Air volume, max. 700 or 1000 l/min

Cooling circuit maintenance free, closed circuit,

Coolant R 404 A

Dimensions (D xW x H) 550 mm x 365 mm x 1050 mm,

Weight, approx. 85 kg

Operating conditions +10 °C to +40 °C environmental temperature

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3. Functional description

(See drawing: "Block diagram ")

3.1 Cold circuit

The cold circuit is indicated on the block diagram with a thick black line.
Cold air is generated in a closed cooling system, filled with the coolant R404A. The filled quantity
is indicated on the plate in the device.
The compressor (6) compresses the gaseous coolant from an initial pressure at the
environmental temperature of approx. 0.6 MPa to an operating pressure of 2.5 MPa. Depending
on operating condition, the maximum temperature of the compressed coolant can be approx.
90° C to110° C. The compressed gaseous coolant gets into the condenser (5). The fan (5) blows
room air through the condenser (5). The coolant is cooled and liquefies at a temperature below
55° C. The pressure of the liquid coolant is approx. 1.8 MPa. The air flow of the fan (5) also
cools the surface of the compressor (6). The fan (5) operates at maximum speed and is not
regulated.
The coolant gets into the evaporator (2) thanks to the mechanical filter (4) and valve (3). It is
spread by the nozzle of the valve (3) The heat exchanger (7) cools. The valve (3) has a
temperature-dependent adjusting device, that adjusts the quantity of coolant in such a way that
only minimum temperatures to approx. -40 °C can occur in the evaporator (2). The pressure in
the evaporator (2) is 0.15 MPa to 0.2 MPa.
The evaporator (2) is designed so that only gaseous coolant can get back into the compressor
(6).
Room air is sucked through the filter mat (8) of the fan (1), blown through the heat exchanger (7)
and then gets to the treated surface cooled.
Moisture is removed from the room air in the heat exchanger (7). It freezes and precipitates as
snow. If the cold system is switched off, the snow melts and the liquid collects in the water
vessel (12).

3.2 Regulating coldness

The temperature sensor (9) measures the real temperature on the evaporator (2). The computer
(A100) evaluates the signal analogously and at a lower temperature limit (- 30 °C) it switches off
the compressor (6) and fan of the condenser (5) via the Optor relay and at an upper temperature
limit (- 25 °C) turns them back on.
With this regulation, the compressor operates in an optimum operating range.

3.3 Cold air control

When treatment is started, the Opto relay (11) turns on the ventilator (1). The air flow of the
ventilator (1) can be changed in 10 steps. For this purpose, a pulse-wide modulated signal is
generated by the computer (A100) with a base frequency of approx. 6 kHz, whose periodic has
different impulse break ratio, depending on the air level (20 % at air level 1 to 100 % at air
level10). When treatment is stopped, the Opto relay (11) turns off the ventilator (1).

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3.4 De-icing

During treatment, snow (3.10 forms in the heat exchanger. After a few hours, this snow strongly
reduces the set cold air flow (3.3). The heat exchange is no longer optimum and the temperature
of the cold air increases.
The heat exchanger (7) should be de-iced, to return to normal operating conditions.
When the device is turned off, the snow melts completely in about 5 hours.
The resulting water flows into the water vessel (12).
An operating key can also trigger de-icing (see Instructions for use, 7). The Opto relay (10) turns
off the compressor (6) and the ventilator of the compressor (5). The ventilator (1) is turned on by
the Opto relay (11) and warm room air is blown through the heat exchanger (7). Complete de­icing takes approx. 30 to 40 minutes at a room temperature of 23 °C.
If the heat exchanger (7) reaches + 8 °C, de-icing is automatically stopped.
The same operating key can be used to stop de-icing.

3.5 Measuring fill level

Water gets into the water vessel (12) due to de-icing (3.4).

From device number 00101 to device number 00325

There is a turnable float with a magnet in the water vessel. At a certain water quantity, the
magnet turns on the level switch (13) (glass tube switch). The compressor (6), ventilator of the
condenser (5) and the ventilator (1) are turned off. A message appears on the display,
mentioning that the water vessel (12) should be emptied.
The level switch (13) is opposite the magnet, on the rear of the recipient for the water vessel
(12). To replace the level switch (13) the recipient of the water vessel (12) and right side wall
(5.1) must be screwed off.

From device number 00326

There is no float with magnet.
3 pressure switches are used as level switch. They are located under the movable recipient of
the water vessel (12). From a certain weight of the water vessel (12), they come on. If the
pressure switches are defective, the recipient for the water vessel (12) must be changed.

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4. Errors

Abbreviations: SA: Service Instructions
GA: Instructions for use

No. Error Possible causes, measures See

1 Crash software:

seldom

often

reproducible

2 Poor contrast display ► Adjust contrast

3 Poor cooling ► Check filter mat

4 Low air flow ► Replace filter mat

5 Compressor does not switch

off

6 Water flows from the device ► Leak in tube guide from heat SA: 5.1

► Turn off device and turn it back on
after 3 minutes
► Control + 5 VDC to computer
A 100 (5,00 V to 5,05 V)

► Replace computer A 100

► Control + 5 VDC to computer

A 100 (5,00 V to 5,05 V)
► Insert plug-in connector for CCFL
illumination onto computer
There is high voltage

► Display is defect

► Fan for cooling condenser

(M003) must be operating
► No ice can form to the compressor on
the coolant return line

► Check temperature sensor (RT001)
► Extreme environmental conditions
► Have cooling circuit checked
(leak, compressor or valve defect,
adjust valve)

► The silicone tube in grip treatment
tube has turned (test: the grip tube can
be turned in handle or in the device
connection)
► Check fixation fan and air guide in the
device
► Check fan (M002)
Test: Pull Bu 001 on fan, fan
operates at maximum speed

► Ice on heat exchanger

► Check temperature sensor (RT001)
► Opto relay (K001) does not switch off
► Fan for cooling condenser (M003)

must operate
► Have cold circuit checked

GA: 11.1

SA: 6.1

SA: 5.2
GA: 5.4
SA: 6.1

SA: 5.1

SA: 5.1
GA: 11.1

SA: 6.2

SA: 6.3

GA: 10.
SA: 5.4

SA: 6.2
GA: 11.1
SA: 5.3

SA: 5.1

SA: 5.1

GA: 11.1
SA: 6.3

SA: 5.1
SA: 5.1

SA: 5.4

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exchanger to water vessel

► Leak in water vessel
►Check level switch (S002)
► No ice can form to compressor on the

coolant return line

7 Handle and tube iced ► Normal after longer operation and

higher air humidity

8 Compressor is on for a long

phase, without the fan for
cold air (M002) coming on
(long ready phase of device)

 Switch-on phase is normal at:
Room temperature to 24°C < 18 Min.
Room temperature to 28°C < 22 Min.
Room temperature to 32°C < 27 Min.

 If values are greater, proceed
according to 3 of this error table.

SA: 3.5

SA: 6.2
GA: 11.1

GA: 10.

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