FläktGroup EQRO Rotary heat exchanger Installation and Maintenance Manual

Brand: FläktGroup

Model: EQRO Rotary heat exchanger

Type: Installation and Maintenance Manual

FläktGroup EQRO Rotary heat exchanger is a device designed to improve the efficiency of ventilation systems by recovering heat from the exhaust air and transferring it to the incoming fresh air. It is suitable for use in both comfort and industrial applications, and can be installed in a variety of configurations to meet the specific needs of each project.

The EQRO Rotary heat exchanger is constructed with a rotor made of a hygroscopic material that absorbs moisture from the exhaust air and releases it into the incoming fresh air. This process helps to maintain a comfortable indoor environment while reducing the energy consumption of the ventilation system.

FläktGroup DC_10243GB 20220921_R1 We reserve the right to make changes without prior notice

EQRO, ROTARY HEAT EXCHANGER

INSTALLATION AND MAINTENANCE INSTRUCTION

Checks before starting the heat exchanger

– The fans must not be run during the

construction period if 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. 13-14 mm)

all around.

– The horizontal seal is lightly in contact with the rotor all

around.

– 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.

Regarding the control logic and operation:

During start up and after each time the AHU has been stopped,

it is recommended that the exhaust fan operates during 1

minute before the supply fan is started.

Soroption rotors

The surface coating on Soroption rotors operates

by absorbing and releasing moisture. The

surface coating is very effective at absorbing

moisture. The moisture in the airﬂow is transferred from one

air stream to the other when the rotor rotates. If the rotary

heat exchanger is stationary for an extended period without air

ﬂowing through it, the surface coating will continue to absorb

moisture. When the unit is started following a long period of

downtime, the rotor may have absorbed a lot of water. We

recommend ensuring that there is a continuous airﬂow through

the rotary heat exchanger. If, for some reason, continuous

operation of the unit is not permitted, start the exhaust air fan

at minimum airﬂow following an extended period of downtime

and ventilate the rotary heat exchanger to remove excess

moisture.

Installation and maintenance Instruction

FläktGroup DC_10243GB 20220921_R1 We reserve the right to make changes without prior notice

Sealing

strips

ROTOR SEALS

The EQRO rotor cassette is fitted with sealing strips equipped with

synthetic bristles with intervening plastic foil. The sealing strips are fitted

along the rotor periphery of the wheel and on top of the dividing beam and

seal there against the inside of the facing plate and rotor wheel.

Sealing

strips

TO ADJUST THE PERIPHERAL AND CENTER TIGHTNESS

The rotor position is factory-preset and normally does not need any

adjustments.

However, adjustment may be necessary in certain cases, for example

after fitting new bearings. The rotor position is simple to adjust provided

that the recommended inspection sections have been arranged.

Otherwise, the cassette will have to be withdrawn out of the Air Handling

Unit.

The rotor shaft is mounted in adjustable shaft mountings. These can be

adjusted 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.

Center bolt

Shaft

→

1 mm

→

1 mm

Center bolt

Adjustment nut

* Adj. horizontally

** Adj. horizontally/vertically

Proceed as follows:

1. Slightly loosen the locking screws on the inside of the dividing beam.

The shaft mounting can now be moved left or right in order to adjust the

sealing. (See Fig. 1:1)

The set screws are used to adjust the angle of the axis by raising or

lowering the shaft mounting on respective side. (See Fig:1:2)

2. When the gap is equal all around, tighten the locking screws on the

inside of the dividing beam to lock the rotor in place. Clearance

between screen wall and rotor ca 13-14 mm.

EURA 1;2

SIZE 005-018, 023

SIZE 020, 027-045, 050, 054, 063, 072

Fig. 1:1

Fig. 1:2

Installation and maintenance Instruction

FläktGroup DC_10243GB 20220921_R1 We reserve the right to make changes without prior notice

Adjustment of sealings:

3. The center seal is reset by losing the bolts on the top of the beams and

moving the sealing holder to the correct position, tightening all bolts.

DRIVE UNIT

The drive unit of the EQRO rotor cassette consists of a motor base plate,

drive motor and belt, with pulley for round drive belt.

The motor, base plate, the necessary cables and speed controller are

fitted.

When doing larger service of the drive or rotor it is recommended to

remove the whole motor bracket by loosening the bolts.

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

Fig. 1:3

Center beam

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, center

spacer, rotation monitor and the speed controller mounting bracket.

(See Fig. 1:3)

Fig. 1:4

B. Block up the rotor and back off the shaft retaining screws. The rotor

can now be rolled out of the cassette. (See Fig. 1:4)

C. The worn bearings can now be tapped out of the rotor hub (See Fig 1:5).

Fig. 1:5

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. (See Fig. 1:6)

Fig. 1:6

E. Roll the rotor back to its position inside the cassette and refit the other

components in the reverse order.

Intermediate ring

IMPORTANT!

After you have ﬁtted new bearings, adjust the rotor

as described on page 2.

Installation and maintenance Instruction

FläktGroup DC_10243GB 20220921_R1 We reserve the right to make changes without prior notice

TO CHANGE THE DRIVE BELT

Normally, the drive belts will work many years of operation but can be

replaced if and when necessary. The original belt has a welded joint. The

replacement belt is jointed together by means of the pin supplied with it.

The correct replacement belt with correct length can be selected from

the spare part list. Alternatively, 10- or 20-meter length can be purchased

for cutting and fixing on site.

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 ventilation installation. If the dust content of the supply and/

or exhaust air is high, the unit should be inspected more frequently.

Maintenance of the heat recovery unit is greatly facilitated if the recom-

mended equipment is used for monitoring and purging operation.

SERVICE SCHEDULE

Object Interval Action

Rotor face 6 months Inspect and clean if necessary.

Drive belt 6 months Check for tension and wear.

Rotor bearings 12 months The EQRO has permanently

lubricated bearings.

Monitoring

equipment

12 months Check the performance.

ROTOR - FACE SURFACES

Non-hygroscopic

Check that there is no dust deposit on the rotor faces.

If necessary, either vacuum-clean the rotor or use compressed air aimed

straight at the surface from a distance of at least 50 mm blowing from

the clean towards the dust coated side.

If vacuum-cleaning or blowing with compressed air proves to be inade-

quate (greasy dust), clean the non-hygroscopic rotor surface as follows:

Spray a grease solvent by hand onto the dust-coated surface, then blow

clean with compressed air from the opposite side aimed straight at the

surface from a distance of at least 50 mm.

As an alternative, the rotor may be flushed with low pressure steam up

to 50 kPa or water up to 50 bar from a distance of at least 50mm aiming

straight at the surface, provided that the condensate from the steam or

the flushing water can be satisfactory collected.

Hygroscopic/Sorption/Epoxy

Check that there is no dust deposit on the rotor faces.

If necessary, either vacuum-clean the rotor face or use compressed air

aimed straight at the surface from a distance of at least 50 mm blowing

from the clean side towards the dust coated side.

Water or grease solvents may not be used for these types of rotors.

IMPORTANT!

Never use methyl ethyl ketone, acetone or other

aggressive solvents.

BEARINGS

The EQRO is equipped with permanently lubricated bearings for which no

maintenance is needed. Check that the bearing sound is normal.

PURGING SECTOR

The EQRO has a fixed purging sector and no adjustment is necessary.

Installation and maintenance Instruction

FläktGroup DC_10243GB 20220921_R1 We reserve the right to make changes without prior notice

REMOVAL OF WHEEL ON EQ PRIME WITH AHU CONTROLS

Size 023-050

Size 005-018

FläktGroup EQRO Rotary heat exchanger Installation and Maintenance Manual

FläktGroup EQRO Rotary heat exchanger Installation and Maintenance Manual

FläktGroup EQRO Rotary heat exchanger Installation and Maintenance Manual

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