FläktGroup ECONOVENT PUM (O,R,V) Installation guide

MAINTENANCE INSTRUCTION FOR ROTARY HEAT EXCHANGERS

PUML ROTOR SIZE 060–420

PUMO (O,R,V) ROTOR SIZE 200-420

PUM(O,R,V) AND PUML

2

Installation and maintenance

FläktGroup DC_9332GB 20220921_R2 Specifications are subject to change without further notice

Content Page

1. Description - Unit design .................................................................................................................................. 3

2. Handling the heat exchanger, Inspection facilities ............................................................................... 4

3. Connection, Checks, Rotor seals .................................................................................................................. 5

4. Installation, Drive equipment, Speed controller ...................................................................................... 6

5. To change the rotor bearings, sizes 060–300 ....................................................................................... 7

6. To change the rotor bearings, sizes 301–420 ....................................................................................... 8

7. Maintenance .......................................................................................................................................................... 10

8. Service schedule ................................................................................................................................................. 12

9. Instructions – Packaging/Lifting/Transport ............................................................................................. 14

3

Installation and maintenance

FläktGroup DC_9332GB 20220921_R2 Specifications are subject to change without further notice

1. DESCRIPTION – UNIT DESIGN – PUM(O,R,V)

DESIGN CONDITION ON DELIVERY

ROOM SIDE

The following should be

connected to this side:

– exh. air duct from premises

– supply air duct to premises

DIRECTION OF ROTATION

The direction of rotation shall be

such that a point on the exhaust

air side of the rotor moves

towards the purging sector.

The location of the purging sector

is shown by yellow tape on the

heat exchanger casing.

Fig. 1:2

Fig. 1:1

Purging sector

Inspection cover

Yellow tape

marks the

location of the

purging sector

Drive motor

Room side

Rotor

Centre beam

Peripheral seal

Casing

V-belt

Motor bracket

Outdoor air side

Centre beam

Sizes 200 – 300

Fig. 1:3

Sizes 200 – 300 can be supplied either as one

unit or as a split unit as shown in Fig. 1:3.

3092B 7;3 PUM fig

Sizes 301 – 420

Fig. 1:4

Fig. 1:5

Sizes 301–420 are always supplied with a split casing and

sectorized rotor as shown in the figures above. See the

Assembly instructions for assembling a heat exchanger of

split design.

Inspection cover

on request

CAUTION!

During the installation period, protect the heat

exchanger against water and moisture.

Take care not to damage the end surfaces of

the rotor, since they are relatively sensitive to

physical damage.

4

Installation and maintenance

FläktGroup DC_9332GB 20220921_R2 Specifications are subject to change without further notice

2. HANDLING THE HEAT EXCHANGER, INSPECTION FACILITIES – PUM(O,R,V)

HANDLING THE HEAT EXCHANGER

The heat exchanger can be handled by means of a forklift truck

or a crane. Keep the packaging in place to protect the rotor until

installation is to be carried out.

Use the tubes in the outer corners of the casing for lifting size

300 or smaller heat exchangers (see Fig 2:1). For lifting size

301–420 heat exchangers, use 4 lifting devices as shown in

Fig. 2:2. Make sure that the heat exchanger will not fall over.

Always mount the heat exchanger on a flat surface capable of

carrying the load.

NB! If to lift the unit in horizontal position, first insert styrofoam or

wooden pieces between the rotor and casing center- and cross

beams. This to support the rotor from vertical shearing.

INSPECTION FACILITIES

To allow for inspection and possible service work on the rotor,

either an inspection section or a duct with inspection panel

must be connected to the heat exchanger. If unit sections

with good access facilities are connected directly to the heat

exchanger, these sections may be used for inspection.

Fig. 2:1

Fig. 2:2

Inspection cover measuring

at least 600 x 600 mm.

Fig. 2:3

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Installation and maintenance

FläktGroup DC_9332GB 20220921_R2 Specifications are subject to change without further notice

3. INSTRUCTIONS FOR ROTARY HEAT EXCHANGERS – PUM(O,R,V)

CONNECTION TO THE DUCTING AND

AIR HANDLING UNIT

Connect the supply and exhaust air ducts either directly to the

casing or by means of a jointing system.

For particulars of connection of the supply and exhaust air ducts

and the direction of air flow, see the instruction plate on the room

side of the heat exchanger.

CHECKS BEFORE STARTING THE HEAT EXCHANGER

Do not run the fans during the construction of the building if the

heat exchanger is not running. Make sure that the appropriate

filters have been installed.

Check that no foreign objects, which may damage the end sur-

faces of the rotor, have been left in the supply and exhaust air

ducts.

Check that the rotor runs freely.

ROTOR SEALS

Check that the gap between the rotor and all rotor seals is be-

tween 1 and 1.5 mm. If necessary, adjust the seals as follows:

Place a spacer, such as a piece of paper, between the rotor and

the seal, push the seal against the spacer and then remove the

spacer.

Kanal

Fig. 3:1

Duct

3092B 15;2,4 PUM fig

3092B 15;2,2 PUM fig

Fig. 3:3 Fig. 3:4

Peripheral seal Hub seal

1–1,5 mm

ca 8 mm

1–1,5 mm

ca 8 mm

3092B 15;2,1 PUM fig

3092B 15;2,3 PUM fig

Fig. 3:5 Fig. 3:6

Centre-beam seal

Sizes 200 – 300

Centre-beam seal

Sizes 301 – 420

ca 8 mm

1–1,5 mm

RUMSSIDA

Till denna sida anslutes

– frånluft från lokalerna

– tilluft till lokalerna

ROOM SIDE

The following should be connected to this side:

– exhaust air duct from premises

– supply air duct to premises

RAUMSEITE

Angeschlossen auf dieser Seite werden:

– Abluftkanal vom Raum

– Frischluftkanal zum Raum

HUONEPUOLI

Tälle puolelle liitetään:

– Poistolma huonetiloista

– Tuloilma huonetiloihin

J4122668-0001

Fig. 3:2

Instruction plate located on the room side of the heat

exchanger.

6

Installation and maintenance

FläktGroup DC_9332GB 20220921_R2 Specifications are subject to change without further notice

4. DRIVE EQUIPMENT – SPEED CONTROLLER – PUM(O,R,V)

DRIVE EQUIPMENT

The motor bracket of the exchanger and the drive motor

with the V-belt pulley and power supply cable fitted are

sometimes delivered in a crate.

Determine the drive motor installation alternative that provides

the best accessibility with the installation work has been

completed.

Remove the cover behind which the motor is to be installed.

Fit the motor bracket and motor in position. Install the motor

so that the motor shaft is horizontal and the belt pulley faces

towards the corner of the casing as shown in the adjacent figure.

Run the power supply cable to the motor through the most

appropriate cable entry hole (see Fig. 4:2).

Fit the V-belt. The V-belt has been secured around the rotor at

the factory. Proceed as follows:

Stretch the V-belt around the rotor and pully, and cut the belt to

such a length that it can only just be prised over the edge of the

pulley after the V-belt has been jointed. When in position, the

V-belt will be automatically tensioned to the correct tension by

the spring load on the motor bracket.

After the system has been commissioned, check the direction

of rotation through the inspection cover in the exhaust air duct:

The rotor shall rotate so that a point on the exhaust air side of

the rotor moves towards the purging sector. The location of the

purging sector is shown by yellow tape on the heat exchanger

casing.

INSTALLATION OF SPEED CONTROLLER AND

RUN OF CABLES

Fig. 4:1

Fig. 4:2

Sizes 200 – 300

Alternative cable entries

Location of speed controller

Cable runs inside the casing,

to one side of the covers

Alternative cable entries

Drive motor

Fig. 4:3

Sizes 301 – 420

Location of speed controller

7

Installation and maintenance

FläktGroup DC_9332GB 20220921_R2 Specifications are subject to change without further notice

5. TO CHANGE THE ROTOR BEARINGS – PUML SIZES 060 – 300, PUM(O,R,V) SIZES 200-300

D. See Fig. 5:3. Back off the centre screw in one of the rotor

mounts and extract the rotor shaft in the opposite direction.

E. The worn bearings can now be tapped out of the rotor hub as

shown in Fig. 5:4. Clean the bearing locations and the inside

of the bearing casing to remove old grease and fit the new

bearings.

F. Roll the rotor back to its position inside the casing and refit

the other components in the reverse order.

G. Use the adjusting screws shown in Fig. 5:2 to adjust the sea-

ling gap, approx. 8 mm clearance around the periphery of

the rotor and tighten the screws to secure the rotor mount,

see Fig. 5:2.

Fig. 5:1

Cross-brace

End cover

Drive motor

Sealing strip

Fig. 5:3 Rotor shaft

Rotor mount

Centre screw

CAUTION!

Chill the bearings to facilitate fitting!

Fit the new bearings at their locations.

Use an intermediate ring as shown in Fig. 5:5

to prevent damaging the bearings.

Fig. 5:2

Centre cover plate Screws for

securing centre

cover plate

Screws for

securing rotor

mount

Adjusting screw

Rotor mount

DRIVE EQUIPMENT

A. Remove the end covers. Dismantle the cross--

brace and the sealing strips. Remove the drive belt from

the motor pulley and lift out the motor after having unscrewed

the screws that secure it. See Fig. 5:1.

B. Back off the screws and remove the centre cover plates.

See Fig. 5:2.

C. Block up the rotor and remove the four screws in the rotor

mount shown in Fig. 5:2. The rotor can now be withdrawn by

rolling it out. See Fig. 5:3.

Fig. 5:4 Fig. 5:5

Intermed. ring

absorbs taps

8

Installation and maintenance

FläktGroup DC_9332GB 20220921_R2 Specifications are subject to change without further notice

6. TO CHANGE THE ROTOR BEARINGS – PUM(O,R,V) AND PUML SIZES 301 – 420

Access to the rotor from both the upper and lower unit

connections is necessary in order to replace the bearings.

B. Dismantle the upper casing components in the following order:

First the diagonal stays, then the top panels, corner pieces,

side panels and finally the upright frame. See Fig. 6:2.

C. Remove the drive belt from the motor pulley.

D. Back off the screws and remove the centre cover plate.

See Fig. 6:3.

E. Back off the two screws in the rotor mounts and at the same

time lift the rotor about 200 mm. Block up the rotor using

two 450 mm long, 100 by 100 mm wooden studs between

the casing centre beam and the rotor hub, lower the rotor.

See Fig. 6:4 and 6:5. Back off the centre screw in one of the

rotor mounts and extract the rotor shaft in the opposite

direction. See Fig. 6:4.

Fig. 6:1

Fig. 6:2

Centre cover plate

Screw for securing

centre cover plate

Screws for

securing rotor

mount

Rotor mount

Fig. 6:3

Front panel

Side panel

Corner piece

Corner

piece

Top panel

Upright frame

diagonal stay

Fig. 6:5

Rotor mount

Rotor shaft

Rotor mount Rotor shaft

450 mm long

100 by 100 mm

wooden studs

Fig. 6:4

Rotor mount

Adjusting screw

9

Installation and maintenance

FläktGroup DC_9332GB 20220921_R2 Specifications are subject to change without further notice

6. TO CHANGE THE ROTOR BEARINGS – PUM(O,R,V) AND PUML SIZES 301 – 420

F. When changing the rotor bearings, the seal ring must also

be dismantled and replaced. The worn bearings can now be

tapped out from the rotor hub as shown in Fig. 6:6. Clean the

bearing locations and the inside of the bearing casing to

remove old grease and fit the new bearings.

G. Lower the rotor back to its position and refit the other compo-

nents in the reverse order.

H. Use the adjustment screws, shown in Fig. 6:4, to adjust the

sealing gap, approx. 8 mm clearance around the periphery

of the rotor and tighten the screws to secure the rotor mount,

see Fig. 6:4.

I. Inject 20 g. of type MOLUB ALLOY 787 lubricant in each bearing.

CAUTION!

Replace both the inner and outer sealing rings!

Chill the bearings to facilitate fitting!

Fit the new bearings at their locations.

Use an intermediate ring to prevent damaging

the bearings. See Fig. 6:7.

Fig. 6:6

Fig. 6:7

10

Installation and maintenance

FläktGroup DC_9332GB 20220921_R2 Specifications are subject to change without further notice

7. MAINTENANCE

ROOM SIDE

The following should be

connected to this side:

– exh. air duct from premises

– supply air duct to premises

DIRECTION OF ROTATION

The direction of rotation shall be

such that a point on the exhaust

air side of the rotor moves

towards the purging sector.

The location of the purging sector

is shown by yellow tape on the

heat exchanger casing.

Fig. 7:2

Fig. 7:1

Purging sector

Inspection cover

Yellow tape

marks the

location of the

purging sector

Drive motor

Room side

Rotor

Centre beam

Peripheral seal

Casing

V-belt

Motor bracket

Outdoor air side

Centre beam

CAUTION!

During the installation period, protect the heat

exchanger against water and moisture.

Take care not to damage the end surfaces of

the rotor, since they are relatively sensitive to

physical damage.

The rotor, seals and drive equipment are the main components

of the heat exchanger that require inspection and service.

The heat exchanger is accessible for service through two in-

spection covers extending over the entire end of the heat

exchanger.

MAINTENANCE SCHEDULE

The intervals tabulated below are applicable to the heat exchanger

on daytime operation only. If the actual operating conditions are

very different, e.g. if conditions are dusty, if condensation occurs

or if the operating time is longer, the intervals must be reduced.

Maintenance of the heat exchanger will be greatly facilitated if

the recommended supervisory and purging equipment is installed.

Object Interval Maintenance work

Face surfaces of

the rotor

6 months Inspect and clean.

Rotor bearings 12 months If the bearings need

periodic greasing,

check and lubricate.

Rotor of split design 6 months

(1 month – applica-

ble to the initial ﬁrst

period of operation)

Check the clamping

of the sectors.

Seals 6 months Check and adjust

the seal positions.

Gap of 1.5 mm.

Drive 6 months (1 and 3

months – applicable

to the initial ﬁrst

period of operation)

Check the belt

tension and adjust if

necessary.

Angle-drive gearbox 6 months Check the oil and

grease content if

the gearbox is

ﬁtted with a plug.

See the instruction

plate on the gear-

box. For particulars

of changing the oil

or gre ase, see the

instructions supplied

for the angedrive

gearbox.

Supervisory and

purging equipment

12 months Check the perfor-

mance.

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

inadequate (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.

11

Installation and maintenance

FläktGroup DC_9332GB 20220921_R2 Specifications are subject to change without further notice

7. MAINTENANCE

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 50 mm aiming straight at the surface, provided that the

condensate from the steam or the ﬂushing water can be satis-

factory 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 com-

pressed 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

Bearings

Units in sizes up to and including 300 are equipped with perma-

nently lubricated bearings. The larger size units have bearings

equipped with grease nipples for periodic lubrication. The normal

lubrication intervals (12 months) and the recommended grease

are speciﬁed on a separate lubrication plate. The grease nipple

for each rotor bearing is located below the corresponding hub cap.

The grease nipples on size 301–415 units are located on the top-

side of the shaft mounting plates; the grease nipples on size

420–500 units are located on the underside of the shaft mount-

ing plates as shown in the ﬁgure 7:3 below.

DRIVE BELT

Fit a new drive belt if the existing one is damaged or worn.

Tension the driving belt once a year.

Shortening the drive belt

Cut the belt as shown in the above drawing. Use a belt lock to join the

belt ends.

ANGLE-DRIVE GEARBOX

The angle-drive gearbox may be ﬁlled with either oil or grease.

Certain gearboxes have a threaded plug for topping-up and

inspection. Check the oil or grease content of these gearboxes

twice a year. Gearboxes that have no plug are permanently lubri-

cated. When changing the oil or grease or topping up, use the

same type of lubricant as that used for the gearbox previously.

The type of oil or grease is speciﬁed on the gearbox. Adjust the

quantity so that the gearcase will be half full.

For particulars of other service on the angle-drive gearbox,

see the instructions supplied.

IMPORTANT!

Do not use methyl ethyl ketone, acetone or

other aggressive solvents.

Location of grease

nipple on size 301 – 415

exchangers

Location of grease nipple on

size 420 exchangers

Fig. 7:3

Fig. 7:4

N.B. File the screws so that they are

ﬂush with the underside of the belt lock.

NOTE!

For some variants, the grease nipple is located

on the hub.

Split rotor

Particularly during the initial period of operation, check that all

rotor sectors are ﬁrmly clamped in position.

12

Installation and maintenance

FläktGroup DC_9332GB 20220921_R2 Specifications are subject to change without further notice

8. SERVICE SCHEDULE

Item

See

page Action

After 1 month of

operation

After 3 month of

operation

Date Initials Date Initials

Rotor of split design 15 (Assembly

instruction 9331) Check the clamping of the rotor sectors.

Belt drive 11 Check the drive belt tension and adjust as

necessary.ﬂ

Item

See

page Action

After 6 month

of operation

After 12 month

of operation

Date Initials Date Initials

Rotor face surfaces 11 Inspect and clean if necessary.

Rotor bearings 7, 8, 9, 11 Inspect and lubricate as necessary.

Rotor of split design 15 (Assembly

instruction 9331) Check the clamping of the rotor sectors.

Rotor seals 5 Check the seal gaps (1–1.5 mm)

and adjust as necessary.

Belt transmission 11 Check the belt tension and adjust as necessary.

Angle-drive gearbox

(version with drain

plug)

11

Check the lubricant level.

Change the oil or grease in accordance with

the instructions supplied with the angle-drive

gearbox.

Supervisory and

purging equipment 11 Check the performance.

Item

See

page Action

After 6 month

of operation

After 12 month

of operation

Date Initials Date Initials

Rotor face surfaces 11 Inspect and clean if necessary.

Rotor bearings 7, 8, 9, 11 Inspect and lubricate as necessary.

Rotor of split design 15 (Assembly

instruction 9331) Check the clamping of the rotor sectors.

Rotor seals 5 Check the seal gaps (1–1.5 mm)

and adjust as necessary.

Belt transmission 11 Check the belt tension and adjust as necessary.

Angle-drive gearbox

(version with drain

plug)

11

Check the lubricant level.

Change the oil or grease in accordance with

the instructions supplied with the angle-drive

gearbox.

Supervisory and

purging equipment 11 Check the performance.

Initial operating period

From ............................…………… to ............................……………….

13

Installation and maintenance

FläktGroup DC_9332GB 20220921_R2 Specifications are subject to change without further notice

8. SERVICE SCHEDULE

Item

See

page Action

After 6 month

of operation

After 12 month

of operation

Date Initials Date Initials

Rotor face surfaces 11 Inspect and clean if necessary.

Rotor bearings 7, 8, 9, 11 Inspect and lubricate as necessary.

Rotor of split design 15 (Assembly

instruction 9331) Check the clamping of the rotor sectors.

Rotor seals 5 Check the seal gaps (1–1.5 mm)

and adjust as necessary.

Belt transmission 11 Check the belt tension and adjust as necessary.

Angle-drive gearbox

(version with drain

plug)

11

Check the lubricant level.

Change the oil or grease in accordance with

the instructions supplied with the angle-drive

gearbox.

Supervisory and

purging equipment 11 Check the performance.

Item

See

page Action

After 6 month

of operation

After 12 month

of operation

Date Initials Date Initials

Rotor face surfaces 11 Inspect and clean if necessary.

Rotor bearings 7, 8, 9, 11 Inspect and lubricate as necessary.

Rotor of split design 15 (Assembly

instruction 9331) Check the clamping of the rotor sectors.

Rotor seals 5 Check the seal gaps (1–1.5 mm)

and adjust as necessary.

Belt transmission 11 Check the belt tension and adjust as necessary.

Angle-drive gearbox

(version with drain

plug)

11

Check the lubricant level.

Change the oil or grease in accordance with

the instructions supplied with the angle-drive

gearbox.

Supervisory and

purging equipment 11 Check the performance.

Item

See

page Action

After 6 month

of operation

After 12 month

of operation

Date Initials Date Initials

Rotor face surfaces 11 Inspect and clean if necessary.

Rotor bearings 7, 8, 9, 11 Inspect and lubricate as necessary.

Rotor of split design 15 (Assembly

instruction 9331) Check the clamping of the rotor sectors.

Rotor seals 5 Check the seal gaps (1–1.5 mm)

and adjust as necessary.

Belt transmission 11 Check the belt tension and adjust as necessary.

Angle-drive gearbox

(version with drain

plug)

11

Check the lubricant level.

Change the oil or grease in accordance with

the instructions supplied with the angle-drive

gearbox.

Supervisory and

purging equipment 11 Check the performance.

From ............................…………… to ............................……………….

14

Installation and maintenance

FläktGroup DC_9332GB 20220921_R2 Specifications are subject to change without further notice

9. INSTRUCTIONS – PACKAGING/LIFTING/TRANSPORT

Packaging/delivery design with

one piece rotor/casing

Packaging/delivery design with

segmented rotor/split casing On site the heat exchanger can be removed with a crane/

lifting wires or using a forklift truck.

Fig. 9.1

Fig. 9.2 Fig. 9.3

15

Installation and maintenance

FläktGroup DC_9332GB 20220921_R2 Specifications are subject to change without further notice

NOTES

………………………………………………………………………………………………………………………………………………………………………………………………………………………………

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A HISTORY OF INNOVATION

AND RELIABILITY

With more than a century of accumulated industry experience, FläktGroup is

in a unique position to deliver energy efﬁcient components and solutions for

integrated performance, reliability and quality. With modern manufacturing

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partner – fulﬁlling and surpassing industry standards and certiﬁcations.

FläktGroup ECONOVENT PUM (O,R,V) Installation guide

FläktGroup ECONOVENT PUM (O,R,V) Installation guide

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