MELAG MELAdem 55 Operating Manual

Technical details are subject to modification without prior notice

Operating

Manual

Reverse

Osmosis

Water

Purifier

MELAdem®55

Dear Doctor,
Thank you for placing your trust in this reverse osmosis water purifier.
Since 1951, MELAG has specialised in the production of sterilisation equipment for medical

practice. During this period, our family-owned and operated company has succeeded in becoming
a leading manufacturer of sterilisation equipment. More than 450,000 MELAG appliances world­wide testify to the exceptional quality of our sterilizers.

Before using the MELAdem

55 please study this operating manual carefully .

In order to ensure a long working life for your reverse osmosis water purifier and to preserve its
value, please make sure t hat it is serviced regularly.

MELAG management and personnel.

Contents

CONTENTS

1 Installation .............................................................................................................................. 3

2 Information on components of the system .............................................................................. 3

3 Placing into operation for the first time .................................................................................... 5

4 Connection of the MELAdem system ...................................................................................... 6

4.1 Connection of the MELAdem system to a Cliniklav 25 autoclave ......................................................................... 6

4.2 Connection of the MELAdem system to an autoclave Type 25 ............................................................................ 7

5 Maintenance instructions ........................................................................................................ 8

5.1 Replacement of the Pre-filter ................................................................................................................................ 8

5.2 Replacement of the activated carbon filter ........................................................................................................... 9

5.3 Replacement of the mixed-bed resin cartridge in the ion-exchanger .................................................................... 9

5.4 Quality test for the permeate ................................................................................................................................ 9

6 Technical Data .......................................................................................................................10

Operating

Manual

MELAdem 55

Page 3

1 Installation

The MELAdem 55 demineralises water using the principle of reverse osmosis. Incoming water at mains pressure is
passed through a semi-permeable membrane contained in a reverse-osmosis module. The mineral content of the water
which permeates the membrane is reduced by approximately 95 %.

The incoming water is thus split up into two parts:

• a demineralised permeate, and

• a part with increased salt concentration (concentrate), which is disposed of.

In order to ensure that even poor quality mains water is purified sufficiently for the operation of medical equipment e.g.
an autoclave, the permeate water from the reverse-osmosis module is also passed through an ion exchange unit. This
contains an ion-exchange resin which is able to reduce any residual mineral contents of the permeate to a minimum. A
storage container is provided in which the purified water can then be stored. It can be connected by a pipe directly to the
autoclave. When the storage container is full, the water inlet valve closes automatically. All operations are controlled by
water pressure.

2 Information on components of the system

1. Mains water supply

connection

2. Pre-filter

3. Activ ated carbon filt er

4. Ion exchanger

5. Reverse osmosis module

6. Storage co ntainer

7. Concentrate outflow pipe

1

3

4

5

7

Sensor

feed water

to feed water

intake of the

Concentrate out flow pipe

Illustration

1 Components of the MELAdem 55

2

Page 4

1: Mains water supply connection
The water purifier is connected to the mains supply via a 3/4’’ stop tap, which is normally left on at all times.

The stop tap should be fitted with a non-return valve and an air-release valve in order to prevent
water flowing back into the mains supply. It should only be closed if the system is not going to be used f or a
period of time (see Section 5“Maintenance instructions“ here), or during servicing and maintenance work. We
also recommend fitting a Water Stop (MELAG Art. No.: 01056), in order to prevent damage due to leaks.

2: Pre-filter
A pre-filter in an exchangeable filter cartridge helps to protect the sensitive reverse-osmosis membrane. It

removes suspended particles, rust and other undesirable matter from the incoming mains water. The
cartridge should be exchanged at least every 6 months, or more frequently if the water supply contains
particularly high levels of impuri ties.

3: Activated carbon filter
Further protection is provided for the reverse osmosis membrane by an activated carbon filter, again in an

exchangeable cartridge. The activated carbon filter is intended primarily to remove free chlorine,
which would damage the reverse-osmosis membrane. The activated carbon cartridge should also be
replaced every 6 months, or more often if the chlorine level of the water supply is high.

4: Ion exchanger
The permeate from the reverse osmosis module flows into an ion exchanger, where it is

demineralized (conductivity < 1µs). The ion exchange resin in the storage container element should be
renewed when it is exhausted.

5: Reverse osmosis module
The reverse osmosis module is the key element in the water purifier. It consists of a thin, wound polyamide

membrane. In addition to colloids, it also holds back many organic substances such as
hydrocarbons, chloro-hydrocarbons, phenols, pesticides etc. The retention capability of the reverse osmosis
filter is approx.

95%. The water which has passed through the filter, known as the permeate, flows on to the ion exchanger.
The residual concentrate is disposed of.

6: Water storage tank
After passing through the ion exchanger, the demineralised water is led into a plastic storage

container where it is stored until needed.
The water storage tank is equipped with a shut-off valve that stops the water feed when the water level

reaches the maximum of approx. 15 litres. When this valve is closed, the shut-off valve of the reverse­osmosis unit also closes, which then stops the flow of untreated water.

An electrical float switch provides a signal to the autoclave type 25 if there is not enough water in the water
tank (< 3 litres).

The permeate storage tank (for the output water) is directly connected to the autoclave if it is equipped for
automatic water replenishment feed (see Section 4“Connection of the MELAdem system“ here). In such
cases, the autoclave will intake deminerali sed water from the lower-lying water storage tank.

7: Connection of the drainage hose for used water
The concentrate from the reverse osmosis is led away for disposal through the concentrate outflow pipe. If

the system is connected to a Cliniklav

25 autoclave or an autoclave type 25, the drainage hose for used

water is connected to the drainage hose of the autoclave itself.

Operating

Manual

MELAdem 55

Page 5

3 Pla ci ng into operation for the first time

When placing the device into operation for the first time, please proceed as follows:

1. Remove the enclosure lid from the unit: unscrew the screws, and carefully remove the enclosure lid in an
upward direction.

2. Use the enclosed screws to mount the unit to a mounting bracket on the wall, or in a lower cabinet.
Install the unit so that it is possible at all times to exchange the filter.

3. Place the water storage tank in the lower cabinet, or next to the unit on the floor
(see Section 4 here).

4. Remove the black closure flaps from the connections on the device, and keep them in a safe place
(you will need them again when you shut down the device, or move it to another place).

5. Hook up the lines as shown in the illustration and description in Section 2 here. All the connecting lines on the unit
have been designated by adhesive labels. The hose connections are delivered with threaded fittings, clamping
rings, and coupling rings (union nuts). Do not allow these hoses to kink (twist or curl).

6. Remove the container element from the ion exchanger. This is necessary to prevent rinse water from
damaging it.

7. Open the feed for the untreated water, and check the threaded fittings to make sure that there is no leakage.

8. Disconnect the hose screw connection from the reverse osmosis unit to the internal storage tank on the latter and
place the hose end in an outflow, floor drain or a bucket.

9. Unscrew the filter housing of the subsequent ion exchanger (4), remove the mixed-bed resin cartridge and screw
on the empty filter housing to flush the unit.

10. Open the raw water tap and let the raw water run through the unit for ca. 20 minutes in order to free the unit from
preservatives and dust residue.

11. Connect the raw water tap after flushing.

12. Unscrew the filter housing of the subsequent ion exchanger. Attention: the filter housing is full to the brim with
water.

13. Pour off the water in the filter housing. Replace the mixed-bed resin cartridge in accordance with the section 5.3
and screw-on the filter housing again.

14. Screw on the house screw connection from the reverse osmosis unit to the internal storage tank to the latter

15. Open the raw water tap. Check whether the reverse osmosis unit and the hose connections are free from leaks

16. Allow the water storage tank to fill for approx. 1.5 - 2 hours, and check the function of its shut-off val ve . When
the tank is completely full, the valve in the tank and in the reverse-osmosis unit will close. This means that
no concentrate will flow.

17. Do not use the contents of the first tank filling (the preservative contained in the system will pollute the first tank
filling). One tank filling will take approx. 3 - 4 h, depending on the pressure and temperature of the untreated
water.

18. Rinse the enclosure and put the container element back in its place.

19. Check the quality of the permeate with a conductivity tester.

Replace the enclosure lid onto the unit. The system will now function completely automatically.

Page 6

Connections seen from below

Feed water 3/4

Cooling water3/4

4 Connection of the MELAdem system

4.1 Connection of the MELAdem system to a Cliniklav 25 autoclave _______________________________

6 Wall mounted trap with double hoze

nuzzle

8 Outlet stop trap 1/2”–3/4” with air

release and non return valve with Y­connection

9.1, 9.2, 9.3 Water stop, consisting of
control unit, solenoid valve and water
sensor

11 Pressure hose for water purification

system

12 Pressure hose for cooling water

12.1 Connection for hose cooling water 3/4”

13 Pipe for wastewater DN22

13.1 Connection for pipe waste water DN

22 Cliniklav

25

14 Pressure hose for feed water supply

14.1 Connection for Pressure hose feed

water supply

15 Hose for wastewater for water

purification system

15.1 Connection for pressure hose waste

water MELAdem 55

16 Hose for feed water for storage tank

17 Water purifier (reverse osmosis

system

18 Storage tank for water purification

system

The MELAdem 55 reverse-osmosis system can be directly connected to autoclaves that have been prepared for
connection of a non-pressurized automatic water feed system. With such a configuration, the autoclave directly pulls
demineralised water out of the deeper-lying water storage tank.

Please follow the steps below to connect the MELAdem

reverse-osmosis system to such a properly prepared autoclave:

1.Install the reverse-osmosis system as described in Section 3 “Placing into operation for the first time“
above.

2.Use the 1/2" delivered pressure hose with 3/4" fittings to connect the suction element of the permeate storage tank
to the feed-water connection of the autoclave.

3. Connect the drain hose of the water-treatment unit to the dr ain hos e conn ect ion of the autoc lav e.

Illustration 2 Cliniclave 25, complete with lower cabinet
and water treatment unit (view from behind)

Wastewater Cliniclave 25
Wastewater water purifier

Operating

Manual

MELAdem 55

Page 7

4.2 Connection of the MELAdem system to an autoclave Type 25 ________________________________________________

6 Wall mounted trap with double hoze

nuzzle

8 Outlet stop trap 1/2”–3/4” with

air release and non return
valve with Y- connection

9.1, 9.2, 9.3 Leak detector,
consisting of control unit,
solenoid valve and water
sensor

11 Pressure hose (2 pieces)
13 Wastewater hose DN22
14 Pressure hose for feed water supply
15 Wastewater hose for water

purification system

15.1 Connection for waste water hose

16 Feed water hose to storage tank
17 Water treatment unit (reverse

osmosis unit)

18 Storage tank for water

treatment unit

19 Sensor for feed water shortage

The MELAdem 55 reverse-osmosis system can be directly connected to autoclaves that have been prepared for
connection of a non-pressurized automatic water feed system. With such a configuration, the autoclave directly pulls
demineralised water out of the deeper-lying water storage tank.

Please follow the steps below to connect the MELAdem

reverse-osmosis system to such a properly prepared autoclave:

1. Install the reverse-osmosis system as described in Section 3 “Placing into operation for the first time“
above.

2. Use the 1/2" delivered pressure hose with 3/4" fittings to connect the suction element of the permeate storage tank
to the feed-water connection of the autoclave.

3. Connect the drain hose of the water-treatment unit to the drain hose of the auto cl av e.

Illustration

3 Autoclave Typ 25, complete with lower cabinet

and water treatment unit (view from behind)

Page 8

5 Maint e na nc e instructions

The following maintenance tasks should be carried out at the stated intervals in order to ensure trouble-free operation:

Frequency

Maintenance task

Daily

Check the permeate with

the conductivity tester (with the Cliniklav

25 autoclave or the autoclave type 25, this will take place
automatically, before every program run).

Every 6 months

Replace the pre-filter

Every 6 months

Replace the activated carbon filter

As necessary (if conductivity values are poor)

Renew the ion-exchange resin cartridge

At regular intervals

Check the tubes and threaded connections for leaks, compressions
or kinks (twists or curls)

Various measures are necessary before or after periods of inoperation:

Period of inoperation

Precautionary measures

Up to 2 weeks

Turn off water intake

More than 2 weeks

Turn off water intake, empty storage container

On resuming operation after more than 4

weeks

Swill out equipment and storage container, and install new pre-

filter, activated carbon filter and ion exchange resin

5.1 Replacement of the Pre-filter _________________________________________________________________

• Turn off the mains water supply

• Unscrew the filter cylinder (a) from the head (b)

• Remove the filter unit (1) and place the new filter unit in

the cylinder

• Take the sealing ring out of the cylinder (a), clean, give
a slight coating of silicone and replace

• Screw back the cylinder by hand (do not use
tools) Check that all parts sit tightly, with no
leaks.

•

Check that all parts sit tightly, with no leaks.

Illustration 4 Pre-filter

Operating

Manual

MELAdem 55

Page 9

5.2 Replacement of the activated carbon filter ____________________________________________________

• Turn off the mains water supply.

• Unscrew the filter cylinder (a) from the head (b)

• Remove the activated carbon filter unit (1) and place the

new activated carbon unit in the cylinder (with the arrow

• pointing upwards!)

• Take the sealing ring out of the cylinder (a), clean, give a

• slight coating of silicone and replace

• Screw back the cylinder by hand (do not use tools)

• Check that all parts sit tightly, with no leaks

.

Illustration 5 Activated carbon filter

NOTE! It is important to exchange the filter unit regularly in order to avoid damage to the reverse

osmosis module which would shorten its operational life.

5.3 Replacement of the mixed-bed resin cartridge in the ion-exchanger ____________________________

When the mixed-bed resin is exhausted (inadequate water

quality of the permeate) then it must be exchanged:

•

Turn off the mains water supply and if necessary empty
the storage container

• Unscrew the cylinder (a) from head (b)

•

Take out the container element (1), remove the lid
and pour out the exhausted resin

• Refill with 0.5 litre fresh resin (the contents of one
package), knocking the element to compact the resin, so
that the entire contents can be included

• Close the lid of the container element

• Take the sealing ring out of the cylinder (a), clean,

grease slightly and replace

• Re-insert the resin unit with the three feet on the
underside

• Tighten the cylinder by hand (do not use a tool)

• Check that all parts sit tightly, with no leaks.

5.4 Quality test for the permeate _________________________________________________________________

The quality of the permeate must be regularly checked. The Cliniklav 25 autoclave and the type 25 autoclave have an
integrated conductivity tester. In the initial operating state of the autoclave type 25, you can display the conductivity by
pressing the button “Water”. At the Cliniklav 25 autoclave the conductivity can be displayed at any time by pressing the

button . The system will automatically measure the conductivity before every program run. If the water quality is poor,
the autoclave display will show the error message “Water quality poor”, and no program will start. The quality of the
permeate should therefore be regularly tested, in order to allow prompt maintenance of the water treatment system. If the
MELAdem system is not connected to the autoclave, you should regularly check the permeate with a conductivity tester.

Illustration

6 Ion-exchanger

Page 10

Rev.: 1 – 14/0068 55 BA_eng_doc

6 Technical Data

Water source

Mains water supply

Bacteriological quality

Drinking water

Membrane

TFC-bacteria resistant, wound module

Permeate output

max. 200 litre/day (at 4.5 bar/25°C)

Retention capability RO

Rated retention capability approx. 95%

Conductivity of purified water (permeate)

- approx. 20-30 µS/cm from 600 µS intake water

- < 1 µS/cm from 600 µS intake water with ion exchanger

Water pressure min/max.

2 bar to 6 bar

Water temperature min./max.

5°C to 35°C

Water pH-value min./max.

4.0 to 10.0

Total mineral content of mains water

max. 1500 mg/l

Iron content of mains water

max. 0.1 mg/l

Yield

approx. 20 - 25 %

Pre-filter I

Fine particulate filter 10”, 5 µm

Pre-filter II

Activated carbon 10”

Post-treatment

Ion exchanger, contents approx. 0.5 litre resin

Dimensions H x W x D

approx. 445 mm x 390 mm x 130 mm

Overall weight (with filters)

approx. 12 kg

Capacity, storage container

approx. 15 litre

Dimensions, storage container H x W x D

approx. 350 mm x 270 mm x 230 mm

Length of inlet / outlet pipes

approx. 1500 mm