Exhausto VEX4000 User manual

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.: [phone]
Fax: [phone]
[email protected]
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
3006263-2020-06-25
2/20

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.
3006263-2020-06-25 Inspection and cleaning
3/20

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
3006263-2020-06-25 VDI6022 Guideline
4/20

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)
3006263-2020-06-25 VDI6022 Guideline
5/20

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.
3006263-2020-06-25 VEX4000 sections
6/20

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.
3006263-2020-06-25 VEX4000 sections
7/20

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.
3006263-2020-06-25 VEX4000 sections
8/20

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.
3006263-2020-06-25 VEX4000 sections
9/20

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.
3006263-2020-06-25 VEX4000 sections
10/20

3.1.4 IC + ICC Cooling section & integrated cooling section with rotary heat exchanger
General
Inspect both chambers (extract air and supply air) and clean if necessary.
Droplet separator:
Clean the droplet separator as follows:
Step Action
1 Switch off the power to the air
handling unit at the isolation
switch before opening the doors in
the section.
Remove the fixed panel and pull
out the droplet separators.
2 Check that the condensate tray's
drain is functioning.
3006263-2020-06-25 VEX4000 sections
11/20

Step Action
3 Clean the sections with a water
hose and blow dry with a com-
pressed air gun before replacing
them.
4 Only replace the droplet separator
when the cooling coil and conden-
sate tray have been cleaned. NB
Be sure to insert the droplet
separator in the direction of air-
flow - see arrow.
Cooling coil:
Clean the cooling coil as follows:
Step Action Photo
1 Remove the frequency regulator
as follows:
1. Loosen the finger screws (with
one of them completely re-
moved)
2. The frequency regulator can
now be twisted to the side.
3. After cleaning, replace the fre-
quency regulator.
NB Only applicable to IC section,
3006263-2020-06-25 VEX4000 sections
12/20

Step Action Photo
2 Use a compressed air gun or water
hose to clean the cooling coils
from the outdoor air side to the
supply side. Blow dry with a com-
pressed air gun.
Condensate tray:
Clean the condensate tray as follows:
Step Action Photo
1 Clean the condensate tray with a
water hose.
2 Mop up excess water in the con-
densate tray.
3006263-2020-06-25 VEX4000 sections
13/20

Step Action Photo
3 Excess water which has not ended
in the condensate tray should be
mopped up before starting the unit.
4 Replace the droplet separator. NB
Be sure to insert the droplet
separator in the direction of air-
flow - see arrow.
3.1.5 SP Inspection section
General:
Inspect both chambers (extract air and supply air) and clean if necessary.
Step Action Photo
1 Loosen the cable in the twists
2 Lift up the cables during cleaning.
3006263-2020-06-25 VEX4000 sections
14/20

Step Action Photo
3 Refix the cables with the twists be-
fore starting the unit.
3.1.6 HWC Hot water coil
General:
Inspect the space in front of the coil, and clean if necessary. This is done in both
chambers in the case of a 2-line section.
HW coil:
Step Action Photo
1 Switch off the power to the air han-
dling unit at the isolation switch be-
fore opening the doors.
2 Blow the coil clean with a com-
pressed air gun. This is done in
both chambers in the case of a 2-
line section.
3OBS: No water must be used for
cleaning HW/HWR coils..
NB
After HWC, an inspection hatch must be installed in the duct.
3006263-2020-06-25 VEX4000 sections
15/20

3.1.7 CWC + DXC Cold water coil and DX coil in housing
General: Inspect both chambers (extract and supply air) and clean if necessary.
This is done in both chambers in the case of a 2-line section.
Droplet separator:
Clean the droplet separator as follows:
Step Action Photo
1 Switch off the power to the air han-
dling unit at the isolation switch be-
fore opening the doors.
2 Inspect both chambers (extract air
and supply air) and clean if neces-
sary. Do this in both chambers in
the case of a 2-line section.
3 Remove the fixed panel and pull
out the droplet separators
3006263-2020-06-25 VEX4000 sections
16/20

Step Action Photo
4 Use a compressed air gun or water
hose to clean the cooling coils
from the outdoor air side to the
supply side. Blow dry with a com-
pressed air gun.
5 Only replace the droplet separator
when the cooling coil and conden-
sate tray have been cleaned .
OBS: Be sure to insert the drop-
let separator in the direction of
airflow - see arrow..
3006263-2020-06-25 VEX4000 sections
17/20

Condensate tray:
Clean the condensate tray as follows:
Step Action Photo
1 Remove the fixed panel and pull
out the droplet separators.
2 Clean the condensate tray with a
water hose.
3 Mop up excess water.
4 Excess water which has not ended
in the condensate tray should be
mopped up before starting the unit.
5 Replace the droplet separator.
3006263-2020-06-25 VEX4000 sections
18/20

3.1.8 HEC Electric heating coil in the housing
General:
Inspect both chambers (extract air and supply air) and clean if necessary. This is
done in both chambers in the case of a 2-line section.
HE coil:
Clean the electric heating coil as follows:
Step Action Photo
1 Clean the electric heating coil with
a dry cloth or brush.
NB: Take care! The elements
may be hot if the run-on period
is not observed.
NB It is advisable to install an installation hatch immediately after the sec-
tion to permit cleaning from both sides.
3.1.9 Location of HE and HW generally
HE - Electric heating coil in the duct
Location generally:
The electric heating coil must be located where it is possible to inspect and clean
it. When installing an electric heating coil in the duct system, an inspection hatch
must also be installed on both sides of the coil to allow for cleaning with a dry
cloth or brush. See section on electric heating coil in cabinet for instructions.
HW - Water heating coil in duct
Location generally:
The water heating coil must be located where it is possible to inspect and clean it.
When installing a water heating coil in the duct system, an inspection hatch must
also be installed on both sides of the coil to allow for cleaning and drying. See
section on hot water coil in housing for instructions.
3006263-2020-06-25 VEX4000 sections
19/20