FläktGroup EURA Rotary heat exchanger Installation guide

Brand: FläktGroup

Model: EURA Rotary heat exchanger

Type: Installation guide

Rotary heat exchanger EURA, 20–53

Fläkt Woods 3167 GB 03.01 1 Specifications are subject to alteration without notice

EU Air Handling Unit MAINTENANCE

Adjustment

At a constant speed, check that the rotor is rotating in

the right direction. The direction of rotation is indicated

on the casing.

If the purging sector requires adjustment, check the

adjustment angle; see following page.

Care

Maintenance and service operations on the recovery unit

concern essentially the rotor, seals and drive equipment.

The recovery unit is accessible for service via the inspec-

tion doors. See Fig. 1. The rotor rolls out for service.

The estimated service interval is 2000 hours during a

12-month period for a normal comfort installation.

Shorter intervals must be used in environments with a

high dust content in the supply air and/or the exhaust air.

Maintenance of the recovery unit is facilitated to a consi-

derable degree by using the recommended equipment for

supervision and forced air operation.

Object Interval Procedure See page

Rotor/front panels 6 months Test and clean, if necessary 2

Rotor/bearing 12 months • Size 20–42 sealed-for-

life bearings, check

(noise) 2

• Size 50–53 lubricate

via grease nipples

check (noise)

Forced air 12 months Check function 2

Drive belt 6 months Check tension, 3

wear and replace

Sealing, rotor Check wear

screen/wall 12 months and slot. 4

Care diagram

Fig. 1

Rotary heat exchanger EURA, 20–53

Fläkt Woods 3167 GB 03.01 2 Specifications are subject to alteration without notice

EU Air Handling Unit MAINTENANCE

Rotor

Front panels

Check that the surface of the rotor is not coated with

dust. Clean with a vacuum cleaner or by blowing with

compressed air. Blowing must take place from the clean

side towards the dusty side.

Where cleaning of the rotor surface by vacuum clea-

ning or blowing with compressed air is unsuitable (greasy

dust), clean as follows:

Spray a grease solvent, e.g. cold degreasing agent

ULCZ-01, by hand onto the dusty surface of the rotor,

followed by forced air cleaning from the other side with

compressed air.

Important

Methyl ethyl ketone, acetone or corrosive substances

must not be used.

Alternatively, cleaning with low-pressure steam or

water may be performed, where permissible, bearing

in mind the possibility of water collecting.

When cleaning with a high-pressure lance, the jet

must be directed at right angles to the structure. The

nozzle should preferably be held about 50 mm from

the surface of the rotor. An appropriate pressure is up

to 80 bar.

Bearings

Sizes 20–42 have sealed-for-life bearings and require no

maintenance. Check that the bearing noise is normal.

Sizes 50–53 have bearings fitted with grease nipples for

lubrication. The normal lubrication interval (12 months)

and the recommended grease (MOLUB ALLOY 787,

20 g) are also stated on the inside of the inspection door.

The grease nipples, one for each rotor bearing, are loca-

ted on the top of the shaft mounting. See page 5 for

replacement of rotor bearings.

Adjustment of purging sector

The forced air cleaning sector is positioned in the exhaust

air flow where the rotor rotates from the exhaust air

channel into the supply air channel.

The sector is adjustable from 0°–6° and is set to 0° on

delivery.

When minimum leakage of exhaust air into the supply

air is required, the forced air cleaning sector must be set

in accordance with the pressure ratio p1– p3of the

system; see the Table and Figs. 2 and 3. The pressures can

be read at measurement nipples on the frame; see Fig. 1.

Pressure difference over sector p1– p3, Pa

Adjustment angle of forced air cleaning sector, 1°– 6°

Standard wave division *)

Coarser wave division **)

1200

700

500

250

320

150

230

110

180

150

1 2 3 4 5 6

*) EURA (b = 1)

**) EURA (b = 2)

Fig. 2

Fig. 3

Purging sector

Adjuster screw

Scale

Exhaust air

Supply air

Rotary heat exchanger EURA, 20–53

Fläkt Woods 3167 GB 03.01 3 Specifications are subject to alteration without notice

EU Air Handling Unit MAINTENANCE

Drive belt replacement

The belt can be replaced with a pre-welded belt or, more

simply, with a belt welded in situ; see separate instruction

“Joint welding equipment” EURA-99-11.

Pre-welded belt replacement

Belt replacement requires access to the two upper unit

connections of the rotor to allow the rotor attachments

to be released. Two alternative methods can be used:

A. Roll out the rotor on its shaft through the inspection

opening. A free inspection space L = half the diameter

of the rotor + 200 mm is required in this case; or

B. Raise the rotor inside the casing.

1. Remove the inspection doors by pushing out the

hinge pins. Dismantle the central rail (1) between the

inspection doors and the transverse sealing plate (2).

See Fig. 4.

2. Remove the drive belt from the motor belt pulley, and

lift out the motor and the motor shelf after unscrewing

the retaining screws for the motor shelf. See Fig. 5.

3. (Size 20–42; Fig. 6). Slacken the three screws (1) in

the rotor brackets (2) slightly and lower the rotor with

the help of the two set-screws (3). Then remove these

screws and the screw (4) located in front of the rotor

bracket. NOTE. Do not slacken the screw (5) located

behind the rotor bracket.

(Size 50–53; Fig. 7). Slacken the four screws (1) in the

rotor brackets (2) slightly and lower the rotor with the

help of the two set-screws (3). Then remove the screws

(1).

4. Dismantle the screw (2) for the forced air cleaning sec-

tor (1) and its bracket (3) and screws (4). See Fig. 8).

5. The rotor can now be rolled out on the central rail,

and the new belt can be passed over the rotor.

6. Roll the rotor back into place are refit the remaining

components in the reverse sequence.

7. Using the set-screws (Item 3 in Figs. 6 and 7), adjust

the slot seal to about 8 mm uniformly around the

periphery of the rotor (Fig. 22) and tighten the screws

(1 and 4; Figs. 6 and 7).

8. Size 50–53. Force 20 g of Molub Alloy 787 into each

bearing.

Fig. 4

Fig. 5

Fig. 6

Size 20–42

Fig. 7

Fig. 8

Size 50–53

Rotary heat exchanger EURA, 20–53

Fläkt Woods 3167 GB 03.01 4 Specifications are subject to alteration without notice

EU Air Handling Unit MAINTENANCE

Pre-welded belt replacement (contd.)

1. Remove the inspection doors by pushing out the

hinge pins. Dismantle the central rail (1) between the

inspection doors and the transverse sealing plate (2).

See Fig. 9.

2. Remove the drive belt from the motor belt pulley, and

lift out the motor and the motor shelf after unscrewing

the retaining screws for the motor shelf. See Fig. 10.

3. (Size 20–42; Fig. 11). Slacken the three screws (1) in

the rotor brackets (2) slightly and lower the rotor with

the help of the two set-screws (3). Then remove these

screws and the screw (4) located in front of the rotor

bracket. NOTE. Do not slacken the screw (5) located

behind the rotor bracket.

(Size 50–53; Fig. 12). Slacken the four screws (1) in

the rotor brackets (2) slightly and lower the rotor with

the help of the two set-screws (3). Then remove the

screws (1).

4. The rotor can now be lifted inside the casing by block-

ing it up and lifting it, for example with a crow bar.

See Fig. 13. The belt can now be passed over the rotor.

5. Lower the rotor back into place and refit the remai-

ning components in the reverse sequence.

For replacement of a belt welded in situ; see separate

instruction “Joint welding equipment” EURA-99-11.

6. Using the set-screws (Item 3 in Figs. 11 and 12),

adjust the slot seal to about 8 mm uniformly around

the periphery of the rotor (Fig. 22) and tighten the

screws (1 and 4; Figs. 16 and 17).

7. Size 50–53. Force 20 g of Molub Alloy 787 into each

bearing.

Fig. 9

Fig. 13

Fig. 10

Fig. 11

Size 20–42

Fig. 12

Size 50–53

Replacement of rotor bearings

Rotor bearings replacement requires access to the two

upper unit connections of the rotor to allow the rotor

attachments to be released. Two alternative methods can

be used:

A. Roll out the rotor on its shaft through the inspection

opening. A free inspection space L = half the diameter

of the rotor + 200 mm is required in this case; or

B. Raise the rotor inside the casing.

1. Remove the inspection doors by pushing out the

hinge pins. Dismantle the central rail (1) between the

inspection doors and the transverse sealing plate (2).

See Fig. 14.

2. Remove the drive belt from the motor belt pulley, and

lift out the motor and the motor shelf after unscrewing

the retaining screws for the motor shelf. See Fig. 15.

3. (Size 20–42; Fig. 16). Slacken the three screws (1) in

the rotor brackets (2) slightly and lower the rotor

with the help of the two set-screws (3). Then remove

these screws and the screw (4) located in front of the

rotor bracket. NOTE. Do not slacken the screw (5)

located behind the rotor bracket.

(Size 50–53; Fig. 17). Slacken the four screws (1) in

the rotor brackets (2) slightly and lower the rotor

with the help of the two set-screws (3). Then remove

the screws (1).

4. Dismantle the screw (2) for the forced air cleaning sec-

tor (1) and its bracket (3) and screws (4). See Fig. 18).

5. The rotor can now be rolled out using the rotor

brackets as wheels. Block up the rotor so that it is not

damaged.

6. Remove the centre screw (Fig. 20) in one of the rotor

bushes and withdraw the shaft in the other direction.

7. For size 50-53, the sealing rings must also be removed

and replaced if any damage is present. See Fig. 20.

8. The old bearings can now be tapped out through the

shaft bore or removed with a puller. See Fig. 21.

Clean any old grease from the bearing seats and the

inside of the bearing housing and fit new bearings.

NOTE. Replace both the inner and outer sealing

rings. See Fig. 20.

9. Roll the rotor back into place are refit the remaining

components in the reverse sequence.

10. Using the set-screws (Item 3 in Fig. 16, 17), adjust

the slot seal to about 8 mm uniformly around the

periphery of the rotor (Fig. 22) and tighten the scre-

ws (1 and 4; Figs. 16 and 17).

11. Size 50–53. Force 20 g of Molub Alloy 787 into each

bearing.

Fig. 14

Fig. 16

Fig. 17

Fig. 15

Size 50–53

Size 20–42

Fig. 18

Rotary heat exchanger EURA, 20–53

Fläkt Woods 3167 GB 03.01 5 Specifications are subject to alteration without notice

EU Air Handling Unit MAINTENANCE

Rotary heat exchanger EURA, 20–53

Fläkt Woods 3167 GB 03.01 6 Specifications are subject to alteration without notice

EU Air Handling Unit MAINTENANCE

Replacement of rotor bearings (continued)

1. Remove the inspection doors by pushing out the

hinge pins. Dismantle the central rail (1) between the

inspection doors and the transverse sealing plate (2).

See Fig. 14.

2. Remove the drive belt from the motor belt pulley,

and lift out the motor and the motor shelf after unsc-

rewing the retaining screws for the motor shelf. See

Fig. 15.

3. (Size 20–42; Fig. 16). Slacken the three screws (1) in

the rotor brackets (2) slightly and lower the rotor

with the help of the two set-screws (3). Then remove

these screws and the screw (4) located in front of the

rotor bracket. NOTE. Do not slacken the screw (5)

located behind the rotor bracket.

(Size 50–53; Fig. 17). Slacken the four screws (1) in

the rotor brackets (2) slightly and lower the rotor

with the help of the two set-screws (3). Then remove

the screws (1).

4. The rotor can now be lifted inside the casing by

blocking it up and lifting it, for example with a crow

bar. See Fig. 19. The belt can now be passed over the

rotor.

5. Remove the centre screw (Fig. 20) in one of the rotor

bracket and withdraw the shaft in the other direction.

6. For size 50–53, the sealing rings must also be remo-

ved and replaced if any damage is present. See Fig.

20.

7. The old bearings can now be tapped out through the

shaft bore or removed with a puller. See Fig. 21.

Clean any old grease from the bearing seats and the

inside of the bearing housing and fit new bearings.

NOTE. Replace both the inner and outer sealing

rings. See Fig. 20

8. Lower the rotor back into place and refit the remai-

ning components in the reverse sequence.

9. Using the set-screws (Item 3 in Fig. 17), adjust the

slot seal to about 8 mm uniformly around the perip-

hery of the rotor (Fig. 22) and tighten the screws (1

and 4; Figs. 16 and 17).

10. Size 50–53. Force 20 g of Molub Alloy 787 into each

bearing.

Fig. 19

Fig. 20

Fig. 21

Inner sealing ring

(Size 50–53)

Bearing

Outer sealing ring

(Size 50–53)

Centre screw

Brush strip

Screen wall

Slot ca 8 mm

Fig. 22

FläktGroup EURA Rotary heat exchanger Installation guide

FläktGroup EURA Rotary heat exchanger Installation guide

FläktGroup EURA Rotary heat exchanger Installation guide

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