FläktGroup DC_10243GB 20231009_R2 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.
– To prevent damage to the power and signal cables, make
sure that all cables are attached in a way so that they
cannot be damaged by the rotor.
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.
2
Installation and maintenance Instruction
FläktGroup DC_10243GB 20231009_R2 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
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
3
Installation and maintenance Instruction
FläktGroup DC_10243GB 20231009_R2 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.
4
Installation and maintenance Instruction
FläktGroup DC_10243GB 20231009_R2 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.
5
Installation and maintenance Instruction
FläktGroup DC_10243GB 20231009_R2 We reserve the right to make changes without prior notice
REMOVAL OF WHEEL ON EQ PRIME WITH AHU CONTROLS
12
4
5
Size 023-050
4
5
33
Size 005-018
/
