Exhausto VEX4000 Manuale utente
VEX4000 - VDI6022 guide
How to inspect and clean a VEX4000 air handling unit
VEX4000
RANGE
MODULES
Original instructions
3006263-2020-06-25 VEX4000 VDI6022 guide
EXHAUSTO A/S
Odensevej 76
5550 Langeskov, Denmark
Tel.: +45 65 66 12 34
Fax: +45 65 66 11 10
www.exhausto.dk
1. Inspection and cleaning
1.1. Inspection and cleaning........................................................................................ 3
2. VDI6022 Guideline
2.1. VDI6022 guideline.................................................................................................. 4
3. VEX4000 sections
3.1. VEX4000 sections.................................................................................................. 6
3.1.1. Supply air and extract air fan sections............................................................. 6
3.1.2. ER Rotary heat exchanger section.................................................................. 8
3.1.3. EX Crossflow heat exchanger section........................................................... 10
3.1.4. IC + ICC Cooling section & integrated cooling section with rotary heat ex-
changer.................................................................................................................... 11
3.1.5. SP Inspection section.....................................................................................14
3.1.6. HWC Hot water coil........................................................................................15
3.1.7. CWC + DXC Cold water coil and DX coil in housing..................................... 16
3.1.8. HEC Electric heating coil in the housing........................................................ 19
3.1.9. Location of HE and HW generally..................................................................19
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1. Inspection and cleaning
1.1 Inspection and cleaning
Prohibition symbol Failure to observe instructions marked with a prohibition symbol
may result in serious or fatal injury.
Danger symbol Failure to observe instructions marked with a danger symbol
may result in personal injury and/or damage to the material.
Scope of the guide These guidelines are intended for the EXHAUSTO air handling unit, in the follow-
ing termed the VEX unit. For accompanying accessories and additional equip-
ment, please see the product guidelines for the specific item.
The instructions must be fully observed to ensure personal safety, protect the
equipment and ensure the correct operation of the VEX unit. EXHAUSTO A/S ac-
cepts no liability for accidents caused by a failure to use the product in accord-
ance with the manual’s instructions and specifications.
Supply air/extract
air
These guidelines use the terms described in DS447-2013:
● Supply air (inlet air)
● Extract air (outlet air)
● Outdoor air
● Exhaust air
Before inspection
and/or cleaning, the
following must be
carried out:
Stop the VEX on the HMI or web server.
Do not open the service doors before the power has been dis-
connected at the isolation switch (OFF position) and the fans
have been stopped. The isolation switch is located on the door
of the heat exchanger section. When the isolation switch is in the
OFF position, the light inside the VEX can still be switched on
and the service socket in the panel can be used. Everything else
on the VEX is de-energised.
There is an extra and separate built-in isolation switch on the
door to the electric heating coil. NB: Units with electric heating
coils thus have two isolation switches, both of which must be in
the OFF position to ensure the unit is de-energised.
Note Before opening the doors, ensure that the air handling unit has
stopped operating for at least five minutes, because the fans
have run-on time.
Locked doors
The doors are opened and closed using the square key.
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2. VDI6022 Guideline
2.1 VDI6022 guideline
Step Part Activity Action 1
mont
h
3
mont
hs
6
mont
hs
12
mont
hs
24
mont
hs
0 Hygiene inspection (see section 7.4 of VDI6022) Xa)
1 Central ventilation plant/units (See section 7.6.4 of VDI6022)
1.1 Check for contamination,
damage and corrosion on the
air side.
Clean and re-
pair. X
1.2 Check for condensation. Clean. X
1.3 Check empty sections for
contamination, damage and
corrosion.
Clean and re-
pair. X
2 Cooling components(see section 7.6.5 of VDI6022)
2.1 Check function and condition
of condensate trays and
drains.
Clean and re-
pair. X
2.2 Check dewpoint sensor, sup-
ply air pipe, circuits and
valves for leakage.
Repair.
X
3 Filters (see section 7.6.8 of VDI6022)
3.1 Check for unacceptable con-
tamination, damage (leak-
age) and odours.
Change any
filters in-
volved.
X
3.2 Check pressure loss. Change filter
stage. X
3.3 Maximum interval for chang-
ing first filter stage. X
3.4 Maximum interval for chang-
ing second filter stage. X
4 Fan(see section 7.6.12 of VDI6022)
4.1 Check for contamination,
damage and corrosion.
Clean and re-
pair, check
condensate
drains.
X
5 Heat exchanger (including heat recovery)(see sections 7.6.13 + 7.6.14 of VDI6022)
5.1 Visual inspection of air-to-air
plate heat exchangers for
contamination, damage and
corrosion.
Clean and re-
pair. X
5.2 Visual inspection of rotating
heat exchangers for contami-
nation, damage, corrosion
and air tightness.
Adjust gas-
kets, clean
and repair. X
5.3 Visual inspection of directly
heated heat exchangers for
air tightness.
Ensure air
tightness. X
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Step Part Activity Action 1
mont
h
3
mont
hs
6
mont
hs
12
mont
hs
24
mont
hs
5.4 Heaters: Check for contami-
nation, damage, corrosion
and air tightness.
Clean, repair
and replace. X
5.5 Coolers: Check cooling coil,
droplet separator and con-
densate tray for contamina-
tion, damage and leak tight-
ness.
Clean and re-
pair.
X
5.6 Function check of drains and
drain pipes.
Clean and re-
pair. X
Xa) 36 months where relevant (without humidification and underground components)
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3. VEX4000 sections
3.1 VEX4000 sections
3.1.1 Supply air and extract air fan sections
General:
Inspect the section chambers (exhaust/outdoor air + extract/supply air) for dirt and
contamination. Clean if necessary.
Filters:
Step Action Photo
1 Switch off the power to the air
handling unit at the isolation
switch before opening the doors.
2 Open the door and pull out the fil-
ters.
3 Inspect for holes and soiling.
4 Vacuum clean the interior surfa-
ces free of dust and dirt – be thor-
ough, especially in front of the fil-
ters.
5 Replace the filters if necessary.
Fan:
It is possible to inspect and clean round the fan without pulling it out.
However, if it seems necessary, the fan can be pulled out as follows.
Step Action Photo
1 Switch off the power to the air
handling unit at the isolation
switch before opening the doors in
the section.
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Step Action Photo
2 If it seems necessary to pull out
the fan, this can be done as fol-
lows:
1. Cut all relevant strips.
2. Dismount hoses and sockets
in the PTH.
3. Dismount necessary cables
from the motor control.
4. The fan can now be pulled
out, and remounted in ac-
cordance with the supplied di-
agram.
Internal dampers:
Once the filters have been pulled out, the damper can be cleaned as follows:
Step Action Photo
1 Place the handle in the button and
turn clockwise until the damper is
fully open. Turn the locking button to
the right of the handle anti-clockwise.
The damper is now locked.
2 The necessary cleaning and inspec-
tion can now be performed.
3NB Remember to unlock the damp-
er once cleaning is complete.
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3.1.2 ER Rotary heat exchanger section
General:
Inspect the area round the rotor for dust and ejected shavings. (Shavings in the
rotor may be ejected once the plant is started up).
Rotor:
Clean the rotor as follows:
Step Action Photo
1 Switch off the power to the unit at the
isolation switch before opening the
doors
2 Inspect the area round the rotor for
dust and ejected shavings. NB It is
completely normal to find shavings
from the rotor belt in the bottom of
the rotor section, especially if the belt
is completely new.
4 Use a compressed air gun to clean
the rotor from the outdoor air side to
the supply side.
Do this repeatedly while manually ro-
tating the rotor.
5 Dust and shavings blown through the
rotor should be vacuumed up on the
other side.
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Step Action Photo
6 Check that the fins on the rotor are
not deformed.
The fins are sharp.
Avoid touching the fins in
the exchanger with sharp
or hard objects – the fins
are very soft and can
easily be deformed,
which will diminish the
output of the VEX.
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3.1.3 EX Crossflow heat exchanger section
General:
Inspect the area round the heat exchanger for dust.
Crossflow heat exchanger:
Clean the heat exchanger as follows:
Step Action Photo
1 Switch off the power to the air
handling unit at the isolation
switch before opening the doors.
2 Inspect the area round the heat
exchanger for dust.
3 Check that the condensate tray's
drain is functioning.
4 Use a water hose to clean the
crossflow heat exchanger from
top to bottom on both sides.
There is access to the heat ex-
changer from the two adjacent fan
sections.
5 Water not ending up in the con-
densate trays under the crossflow
heat exchanger should be mop-
ped up before starting the unit.
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