Exhausto VEX4000 Technical specifications
VEX4000
Maintenance Instructions
Original instructions
3005236-2015-05-19 VEX4000_Maintenance Instructions
EXHAUSTO A/S
Odensevej 76
DK-5550 Langeskov
Tel.: +45 65 66 12 34
Fax: +45 65 66 11 10
www.exhausto.com
1. After commissioning
1.1. After 2-3 weeks of operation ................................................................................3
1.1.1.Check and if required, shorten the rotor belt's length (applies only to VEX4070
- 4100).......................................................................................................................3
1.1.2.Rotor section - check for shavings in the bottom.............................................4
2. Maintenance 2.1. General information about maintenance.............................................................5
2.2. Maintenance Schedule..........................................................................................6
2.2.1.Replacement of filters .....................................................................................7
2.2.2.Removing motor (ZerAx® fan) ........................................................................7
2.2.3.Fitting the motor (ZerAx® fan) ........................................................................9
2.2.4.Removal the plenum fan................................................................................10
2.2.5.Fitting the plenum fan ....................................................................................13
2.3. Cleaning................................................................................................................14
2.3.1.Sections in general.........................................................................................14
2.3.2.Damper and damper motor............................................................................15
2.3.3.Rotary heat exchanger section (ER)..............................................................15
2.3.4.Crossflow heat exchanger (EX).....................................................................16
2.3.5.Electric heating coil (HE, HCE)......................................................................16
2.3.6.Water heating coil (HW, HWR)......................................................................16
2.3.7.Cooling coil (CW, CWC).................................................................................16
2.3.8.Condenser (DX, DXC)....................................................................................17
2.3.9.Integrated cooling IC/ICC...............................................................................17
2.3.10.Fans (FANE, FANS).....................................................................................17
2.3.11.Especially for outdoor units. ........................................................................18
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1.After commissioning
1.1After 2-3 weeks of operation
1.1.1Check and if required, shorten the rotor belt's length (applies only to VEX4070 - 4100)
Step Action
1 After 2-3 weeks of operation:
●Check the distance X from the drive shaft on the rotor belt pulley to
the bottom of the section and compare with the following dimensions:
VEX4070: 175 mm ±15 mm
VEX4080: 195 mm ±15 mm
VEX4090: 195 mm ±15 mm
VEX4100: 198 mm ±15 mm
2If the measured distance is greater than the stated values,
the rotor belt must be shortened.
3●Put tape on both sides of the assembly fixture before loosening the
belt.
4●Loosen the fixture using a screwdriver and shorten the belt.
NB: Shorten one hole at a time, and immediately measure X,
because it is important that the belt does not become too
short.
5●Refit the belt again via the fixture. Remove the tape and re-check X to
ensure it is correct.
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1.1.2Rotor section - check for shavings in the bottom
Step Action
1 After 2-3 weeks of operation:
●Check for shavings in the bottom of the rotor section and if so, remove
them by vacuum cleaning. Shavings can come from the belt or from
the manufacture of the rotor.
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2.Maintenance
2.1General information about maintenance
It is important that the VEX4000 air handling unit is regularly maintained, so that its
output is optimal at all times. This chapter describes how and when recommended
maintenance should be carried out, which components should be checked and how to
replace certain parts, etc.
Opening the air han-
dling unit Do not open the service doors until the supply voltage has been
disconnected at the isolation switch (OFF position) and the fans
have stopped. The isolation switch is located on the door of the
heat exchanger section. Once the isolation switch is in the OFF
position, the light inside the VEX can be switched on and the serv-
ice socket in the panel can be used. Everything else on the VEX is
de-energised.
There is an extra separate built-in isolation switch on the door to
the electric heating coil. Units with electric heating coils therefore
have two isolation switches, both of these must be in the OFF po-
sition to ensure the unit is de-energised.
NB: 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 using the square key.
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2.2Maintenance Schedule
State of the unit/component Procedure Once a
year Twice a
year
Filters* Change when the display shows the filter alarm.
Recommended that both filters are replaced at the
same time.
NB: The control system will give an "early warning"
when a filter is becoming soiled, so that there is time
to obtain a new filter or to call a service technician.
The filter should be changed at least
X
Fans/vibration dampers Check:
●fans, vibration dampers and tightness of seals.
●for occurrence of abnormal sounds or vibrations.
Vibrations may be due to dust accumulation on
the fan impellers and in general, will cease after
cleaning. If not, then check bearings and for im-
balance on the fan impeller.
X
Air intake Ensure the air intake is free of foreign bodies, such as
paper, leaves, etc. X
Filter monitor Check X
Seals and sealing strips Check that all the seals are tight. X
Heating coil (accessory) Check
Cleaning. See next sections. X
Rotary heat exchanger Check
Cleaning, as required, see next sections. X
Crossflow heat exchanger Check
Clean as required, see next sections. X
Safety functions check Firethermostats, returnwatersensor, smokedetector X
Damper Function check X
Motor valve and circulation
pump (accessories) Function check X
Integrated cooling machine
IC/ICC Mandatory service procedure carried out by author-
ised cooling company X
Water trap (however not Si-
phon water trap) Check water trap and if required, top up with water. X
*Filters Only use original filters
●Theprovided filterdata andpressure dropcurves (seeunder section"Technical
data" in Fitting and Installation Instructions) are based on the use of original
filters.
●Eurovent certification is only valid if original filters are used.
●Use of non-original filters may cause leakage in the VEX and impair filter func-
tion.
●EXHAUSTOrecommendsthat youregisterthefilter replacementdatetoensure
filters are replaced at the correct intervals.
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2.2.1Replacement of filters
Step Action Illustration
1●Switch off the power to
the unit at the isolation
switch before opening
the doors
●The filters are kept in po-
sition by a rail system,
which is closed using
two handles, one for the
top and one for the bot-
tom.
2●Loosentherailsbypush-
ing the handles towards
the filters.
●The filters can now be
pulled free of the rails
and replaced with new
filters (if required see re-
marks about filters in the
section "Maintenance
Schedule").
2.2.2Removing motor (ZerAx®fan)
Step
(1-11) Action
1Switch off the power to the air handling unit at the isolation switch before
opening the doors.
2Wait for a minimum of two minutes before opening the
doors, because the fan has approximately two minutes of
run-on time.
3 Open the door to the fan section.
4 Remove the screws in the supports in the bottom of the fan unit.
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Step
(1-11) Action
5
Loosen the flexible connection.
6 Pull the fan out and provide it with appropriate support.
7Remove the three screws (pos. 1) that hold the hub cover and detach the
cover (pos. 2).
1 2 3 4 67a 9 10 85 7b
1. Three screws - 2. Hub cover - 3. Centre screw - 4. Centre washer - 5.
Hub cores - 6. Fan impeller - 7a. Nuts - 7b. Bolts - 8. Motor - 9. Cabinet
- 10. Vane
When working on the fan, the individual parts must be han-
dledin awaythat avoidsanyimpacts. Impacts candamage
the motor bearings and other fan parts.
8Remove the centre screw (pos. 3) in the fan impeller and centre washer
(pos. 4).
9Remove the fan impeller using a puller fixed in the two threaded holes in
the hub core (pos. 5).
10 Remove the motor from the motor bowl by removing the nuts and bolts
(pos. 7a and 7b).
11 Remove the motor (pos. 8). The motor and fan unit are now ready for
servicing.
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2.2.3Fitting the motor (ZerAx®fan)
Step
(1-11) Action
1 2 3 4 67a 9 10 85 7b
1. Three screws - 2. Hub cover - 3. Centre screw - 4. Centre washer - 5.
Hub cores - 6. Fan impeller - 7a. Nuts - 7b. Bolts - 8. Motor - 9. Cabinet
- 10. Vane
When working on the fan, the individual parts must be
handled in a way that avoids any impacts. Impacts can
damage the motor bearings and other fan parts.
Thelocking washersandnuts should bereplacedonce the
fan is assembled.
1 Fit the motor (pos. 8) and check that the motor shaft is positioned con-
centrically in the cabinet.
2 Fit and tighten bolts and nuts (pos. 7a and 7 b).
3 Fit the fan impeller (pos. 6) on the motor shaft using the tool which is
secured in the threaded hole on the motor shaft. The hub on the fan
impeller must be tightened up to the stop on the collar of the motor shaft.
Check that the fan impeller can turn freely.
4 Fit the centre washer (pos. 4) using the centre screw (pos. 3).
5 Fit the hub cover (pos. 2) using the three screws (pos. 1).
6 Connect the motor cable.
7 Push the fan unit into position.
8 Fit the flexible connection.
9 Secure the fan unit using screws in the supports.
10 Close the door to the fan section. Close the door and lock using the
square key.
11 Before starting up the fan, see the assembly and installation instructions
for VEX4000.
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2.2.4Removal the plenum fan
Step
(1-11) Action
1●Switch off the power to the air handling unit at the isolation switch before
opening the doors.
2Wait for a minimum of two minutes before opening the doors,
because the fan has approximately two minutes of run-on time.
3●Open the door to the fan section.
4●Remove the EXcon FanIO module from the plate it is fitted to.
●Cut the strips for the conductors/cables, so the module incl. conductors/
cables can be placed in the bottom of the section.
5●Remove the four bolts at the front of the rail system.
6●Cut the strips for the air hose, which runs below the rail and up into the
fan motor.
7●Cut the strips for the cables, which run up into the fan motor.
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