FläktGroup EQRA Rotary heat exchanger Installation and Maintenance Manual

Brand: FläktGroup

Model: EQRA Rotary heat exchanger

Type: Installation and Maintenance Manual

Fläkt Woods 8652 GB 2011.02 1

Subject to alteration

Installation and maintenance instruction

EQRA Checks, Rotor Seals, Drive Unit

Rotary heat exchanger

Checks before starting the heat exchanger

– The fans must not be run during the construction

periodif the heat exchanger is not running.

– Also make sure that the appropriate filters have

been fitted.

– The rotor is free to rotate

– The peripheral seal of the rotor is in contact with

the partition, and that the gap is the same (approx.

8 mm) all round.

– The centre seal is lightly in contact with the rotor

allround.

– There is no significant damage to the rotor face.

– To prevent damage of the rotor surfaces, make

sure that no foreign objects have been left inside

the connected supply air and extract air ducts.

Rotor Seals

The EQRArotor

cassette is ﬁtted with

sealing strips equipped

with synthetic bristles

with intervening

plastic foil. The sealing strips are ﬁtted along the rotor

periphery and seal there against the inside of the facing

plate,

partially along the inside of the

dividing beam (Sizes 005 – 018)

or top (Sizes 023 –050).

The sealing strips are permanently mounted and under

normal circumstances do not require adjustment.

To adjust the peripheral seal

The rotor shaft is mounted in eccentric shaft moun-

tings.These can be turned individually to angle the shaft

and thus also the rotor in order to ensure that the sealing

gap is uniform all round. Adjustment to only one shaft-

mounting is normally sufficient.

Proceed as follows:

1.Back off the locknut and locking screw on the frontbe-

am of the shaft mounting which is mosteasily accessible.

Fläkt Woods 8652 GB 2011.02 2

Subject to alteration

Installation- instruction

2. When the gap is equal all round, tighten the locking

screw and refit the centre seal.

Rotary heat exchanger

Locking screws-

with locknuts

Front beam

Shaft mounting

Centre seal

Peripheral seal

Brush seal

Partition

Gap approx. 8 mm

Fläkt Woods 8652 GB 2011.02 3

Subject to alteration

Installation and maintenance instruction

Drive Unit

The drive unit of the EQRA rotor cassette consists of a

motor base plate, drive motor with belt pulley for round

drive belt, motor base plate, and the necessary cables

and speed controller, if fitted.

Forall major service of thedriveunit or rotor,itisadvi-

sable to remove the entire motor base plate by backing

off the retaining screws, tilting the motor base plate as

shown and unhooking it up off the screws.

For the size 05 to 018 units, the motor is mounted on a

bracket with ”hooks” secured in recesses in the motor-

base plate. The bracket is secured by M6 screws.

For the size 018 to 050 and 054, 063, 072 units, the drive

motor is secured by screws directly to the motor base

plate.

After having correctly refitted and secured the motor,

fit the drive belt around the belt pulley. The drive belt

does not require re-tensioning.

To Change the Rotor Bearings EQRA, Sizes

005 – 018

A. Withdraw the cassette from the Air Handling Unit

casing just so far that the rotor shaft retaining screw is

accessible. Remove the drive belt from the motor

pulley.Then dismantle the motor base plate, centre

spacer, rotation monitor and the speed controller

mounting bracket.

B. Blockuptherotorandbackofftheshaftretainingscrews.

Then dismantle one centre beam.Withdraw the rotor

shaft. Therotorcan now berolledout ofthe cassette.

Rotary heat exchanger

CAUTION!

Mark how the centre beam is mounted. If

it is not refitted correctly, the purging

sector will not purge the rotor passages!

Fläkt Woods 8652 GB 2011.02 4

Subject to alteration

Installation and maintenance instruction

C. The worn bearings can now be tapped out of the rotor

hub.

D. Clean the bearing positions and the inside of the

bearing casing to remove old grease and fit new

bearings. If you first chill the bearings, this will make

it easier to fit them. Use an intermediate ring in front

of the bearing to prevent bearing damage.

E. Roll the rotor back to its position inside the cassette

and refit the other components in the reverse order.

To Change the Rotor Bearings EQRA,

Sizes 020 – 050, 054, 063, 072

AA. Withdraw the cassette from the Air Handling Unit

casing just so far that the rotor shaft retaining screw

is accessible. Remove the drive belt from the motor

pulley. Then dismantle the stay, if fitted, the motor

base plate, centre spacer, rotation monitor and the

speed controller.

BB. Block up the rotor and remove the locking nuts and

lockingboltsoftheshaftmountasshowninfigure BB.

Rotary heat exchanger

Intermediate ring

To Change the Rotor Bearings EQRA,

Sizes 005 – 018

Fläkt Woods 8652 GB 2011.02 5

Subject to alteration

Installation and maintenance instruction

CC. Tap therotorshaftout of thehub without damaging

the shaft. Use a soft rod made of brass or the like!

Place the two spacer rings at a safe location and

clean them if necessary. These rings are seated

between the framework and the bearings.

DD. Then replace the bearings as described in Items C

and D in the previous section (sizes 005-018).

EE. Refit the details in the reverse order.

Rotary heat exchanger

Locking bolt

Locking nut

IMPORTANT!

After you have fitted new bearings,

adjust the rotor as described on pages

6 and 7.

To Change the Rotor Bearings EQRA,

Sizes 020 – 050, 054, 063, 072

Fläkt Woods 8652 GB 2011.02 6

Subject to alteration

Installation and maintenance instruction

Shaft Adjustment EQRA, Sizes 020– 050

The rotor position is factory-preset and normally does

not need any adjustment.

However, adjustment may be necessary in certain

cases, for example after fitting new bearings. The rotor

position is simple to adjust provided that the recomm-

mended inspection sections have been arranged.

Otherwise, the cassette will have to be withdrawn out of

the AirHandling Unit.

A. Back off the locking nut and the lockingbolt.Adjust

the adjusting nuts to centre the shaft in the hole in

the centre support.

Do this on both sides of the frame.

Tighten the locking bolts applying a torque of 50 Nm.

The shaft is now in its initial position. Now check

that the rotor is correctly positioned.

If so, secure the locking bolt by means of the locking-

nut on both sides. If not, proceed with step ”B”.

B. Ascertain in which direction the rotor runs out.

Back off the locking bolts again. Use the adjustment

bolts to adjust the rotor to its proper position.

Tighten the locking bolts applying a torque of 50

Nm. Recheck the position of the rotor. If the rotor is

now centred, secure the locking bolt by tightening

the locking nut on both sides.

For an illustration of how to make this adjustment,

see figures beside.

Rotary heat exchanger

Locking nut Locking bolt

Adjusting bolt

Centre support

Vertical adjustment

Tighten the adjusting nuts in the same direction in rela-

tion to one another.

Tighten the adjusting nuts in opposite directions in

relation to one another.

Horizontal adjustment

Service schedule

Rotor - Face surfaces

Check that the rotor face is not coated with dust. Clean

by vacuum cleaning, or by blowing with compressed

air from the clean side towards the dust-coated side.

If vacuum cleaning or blowing with compressed air

proves insufficient for cleaning the rotor face (fatty

dust), proceed as follows:

Spray a grease solvent by hand, e.g. the degreasing

agent, on to the dust-coated rotor surface, and then

blow compressed air from the opposite side.

As an alternative, the rotor may be flushed with low-

pressure steam or water, provided that facilities are

available for collecting the water.

When cleaning by means of a high-pressure nozzle,

direct the jet at right angles so the rotor face structure.

The nozzle should preferably be held about 50 mm

from the rotor face. The pressure should not be higher

than 80 bar.

Bearings

The EQRA is equipped with permanently lubricated

bearings for which no maintenance is needed. Check

that the bearing sound is normal.

Purging sector

The EQRA has a permanently fitted purging sector.

Fläkt Woods 8652 GB 2011.02 7

Subject to alteration

Installation and maintenance instruction

Rotary heat exchanger

To change the drive belt

Due to wear, it may be necessary to change the drivebelt.

The original belt has a welded joint. The replacement

belt is jointed together by means of the pin supplied

with it. Make sure that the belt has the correct length

according to the table below.

Direction of rotation

Check that the rotor is rotating in the right direction.

Maintenance

Inspection and service on the heat recovery unit

concern mainly the rotor, seals and drive equipment.

The heat recovery unit is accessible for service

through the inspection doors which cover the whole of

the side wall. The rotor can be rolled out for service.

The intervals are based on the assumption that the

unit is in operation for about 2000 hours over a 12-

month period and operates in a normal comfort venti-

lation installation. If the dust content of the supply

and/or exhaust air is high, the unit should be inspec-

ted more frequently. Maintenance of the heat recovery

unit is greatly facilitated if the recommended equip-

ment is used for monitoring and purging operation.

Object Interval Action See page

Rotor face 6 months Inspect and clean,

if necessary. 7

Drive belt 6 months Check for tension 7

and wear.

Rotor bearings 12 months The EQRA has permanently 7

lubricated bearings.

Monitoring

equipment 12 months Check the performance.

N.B.

Never use methyl ethyl ketone, aceto-

ne or corrosive liquids.

Size Length, mm

005 1984

008 2932

011 3253

018 3863

023 4807

032 5084

041 5740

050 6688

072 7541

FläktGroup EQRA Rotary heat exchanger Installation and Maintenance Manual

FläktGroup EQRA Rotary heat exchanger Installation and Maintenance Manual

FläktGroup EQRA Rotary heat exchanger Installation and Maintenance Manual

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