Exhausto VEX300 Series User guide

VEX308 EXact2
Operating and servicing instructions
Original instructions
3004252-2021-05-18 VEX308 EXact2
EXHAUSTO A/S
Odensevej 76
DK-5550 Langeskov
Tel.: [phone]
Fax: [phone]
[email protected]
www.exhausto.dk

1. Operation
1.1. Operation................................................................................................................ 3
1.2. Operation with associated PIRB, CO2B or RHB sensors.................................. 3
1.2.1. Indoor climate levels ....................................................................................... 3
1.3. Operation with CO2B and PIRB............................................................................4
1.4. Operation with RHB and PIRB.............................................................................. 5
1.5. Operation via timer operation, manual or external timer................................... 6
1.5.1. TIMERBUTTON2............................................................................................. 6
1.6. Alarms and troubleshooting................................................................................. 7
1.6.1. De-icing principle .............................................................................................7
2. Maintenance and servicing
2.1. Maintenance........................................................................................................... 8
2.1.1. VDI 6022.......................................................................................................... 8
2.1.2. Maintenance intervals...................................................................................... 9
2.2. Replacement of filters......................................................................................... 10
Menu 3.1.4 + Menu 8.1 - Filter (monitoring with hour counter) ..................... 10
2.3. Removing and cleaning the counterflow heat exchangers and heating coils
......................................................................................................................................10
2.3.1. Removing and cleaning the counterflow heat exchangers and heating coils
.................................................................................................................................10
2.4. Opening of partly integrated inspection hatch................................................. 18
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1. Operation
1.1 Operation
Operating methods There are several ways of operating VEX308:
● Operation with CO2(CO2B) and motion sensors (PIRB)
● Operation with humidity (RHB) and motion sensors (PIRB)
● Operation without associated PIRB, CO2 or RH sensors
● Operation with web server
HMI control panel,
EXact
Connect the control panel to the unit in order to e.g.
● Reset the alarm
● Alter the week plan and operation
● Alter the comfort level (temperature and ventilation level)
● Alter the start and max. values for the sensors
For a more detailed explanation of the functions of the EXact control system,
please see the EXact Basic Instructions for VEX308.
Web server The web server allows control of the unit and monitoring of alarms. The VEX can
be connected to building management systems, BMS, via the web server. See the
accompanying web server instructions.
1.2 Operation with associated PIRB, CO2B or RHB sensors
Factory settings The following operating settings are installed when the VEX is supplied from the
factory with CO2B/RHB and PIRB:
● Weekly plan activated OFF
● PIRB timer - time interval = 30 min. (interval from activation of motion sensor
until the unit shuts down)
Comfort level:
● t=20°C
● ventilation airflow = 30% (minimum airflow when CO2 and humidity level are
satisfactory)
PIRB PIRB has an integral timer which can be set to time intervals of 10, 30, 60 and 120
min. The time interval can be changed as follows:
● Open VEX308
● Dismount PIRB
● Set the interval on the rear
0 = 10 min.
1 = 30 min. (factory setting)
2 = 60 min.
3 = 120 min.
1.2.1 Indoor climate levels
There are two indoor climate levels - comfort and economy.
Comfort Optimum energy-efficient comfort levels.
Economy Operation with greater energy savings. Only applicable when the room is empty of
persons, as it permits wider temperature limits.
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1.3 Operation with CO2B and PIRB
If the CO2 level
in the room is ...
and VEX is operated according
to indoor climate level
Remarks:
Comfort Economy
under 800 ppm*) PIRB is activated (persons in
room)
PIRB timer function
controls the operation
over 800ppm PIRB is activated, the CO2
sensor starts up CO2 com-
pensation, see graph
CO2 sensor controls
the operation
over 800ppm PIRB timer function stops,
operation will continue until
the CO2 level falls below 800
ppm
CO2 sensor controls
the operation
above 800 ppm this has occurred while the
unit was shut down (OFF),
the VEX will start up
CO2 sensor controls
the operation
*) The 800 ppm is a factory setting. It is possible to select a different CO2 level on the
control panel.
CO2 compensation -
example
CO2concentration in the air is … Airflow
A less than Start is the same as the set value
Bbetween Start and Maximum *) increases gradually to a high lev-
el, depending on the current CO2
level
C greater than Maximum is increased to maximum air re-
placement
*) Start may be e.g. 800 ppm and maximum may be 1200 ppm.
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1.4 Operation with RHB and PIRB
If the humidity
level in the
room is ...
and VEX is operated according
to indoor climate level
Remarks:
Comfort Economy
under 60%*) PIRB is activated (persons in
room)
PIRB timer function
controls the operation
over 60% PIRB is activated, the RH sen-
sor starts up RH compensa-
tion, see graph
The RH sensor con-
trols the operation
over 60% PIRB timer function stops, op-
eration will continue until the
humidity level falls below 60%
The RH sensor con-
trols the operation
above 60% this has occurred while the
unit was shut down (OFF), the
VEX will start up
The RH sensor con-
trols the operation
*) The 60% is a factory setting. It is possible to select a different humidity level on the
control panel.
Humidity compen-
sation - example
Air humidity level is... Airflow...
A less than Start is the same as set value
B between Start and Maximum increases gradually to a high value,
depending on the current air humidity
(RH level)
C greater than Maximum is increased to maximum air replace-
ment
*) Start may be e.g. 60% and maximum may be 80%.
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1.5 Operation via timer operation, manual or external timer
Factory setting The following operating settings are installed at the factory when the VEX is sup-
plied without PIRB, CO2 and humidity sensors
● Manual operation (a switch to week plan is possible, see EXact basic instruc-
tions)
● Ventilation airflow 70%
External start/stop If external start/stop is desired, the VEX switch can be mounted in the room. Op-
eration will depend on whether Manual or Week Plan is selected:
If the following is
selected
and the switch is activated,.
manual operation the unit will start up and continue until the switch is activa-
ted again, after which the unit will stop.
week plan the unit will follow the operating settings in the week plan.
When the switch is activated, the unit will stop.
Function If the unit is shut down via an external start/stop, the unit will remain stopped,
whether or not CO2B or PIRB is mounted or an attempt is made to start up the
unit via a web server/BMS.
1.5.1 TIMERBUTTON2
● Install TIMERBUTTON2 and change to week plan + OFF via the control panel.
● Set the desired airflow e.g. 70% - at the comfort indoor climate level
● Set the desired room temperature, e.g. 22°C
● Set the dipswitch settings behind TIMERBUTTON2
Dipswitch settings
Time DIP1 DIP2
30 min. OFF OFF
60 min ON OFF
120 min. OFF ON
240 min. ON ON
Function Pressing TIMERBUTTON2 overrides the VEX and switches it to Comfort indoor
climate level. Comfort operation continues until the set time expires or until TIME-
RBUTTON2 is pressed repeatedly.
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1.6 Alarms and troubleshooting
Troubleshooting chart
Error states Check Remedy
The unit is not in operation - power supply and
fuses.
Lack of power supply or fuse.
● Lack of power supply.
● Blown fuse.
● HPFI relay tripped.
The unit is not in operation - PIR sensor. ● Attempt to activate PIR sensor.
The sensor on the unit
lights up red...
Connect the control panel or
see the web server.
Without HMI/Web server:
When the alarm (in the PIR
sensor) shines red, the most
usual alarms will be filter
change or condensate level
alarm, see below in the ta-
ble.
- reason for alarm via
HMI control panel or
web server.
● Read off the alarm number and see the
alarm list in the EXact basic instructions to
remedy the fault.
● Reset alarm in menu 4 "Reset alarms"
Condensate level monitor - water level in conden-
sate tray.
For units without condensate pump:
If the alarm activates regularly, you should con-
sider mounting a condensate pump on the unit.
For units with condensate pump:
If the level is high and a condensate pump has
been installed, check if the condensate pump and
drain are working properly.
Operating hours counter on
filters - the set number of
operating hours has been
exceeded.
- if the filters look dirty. ● Replace dirty filters.
● Reset alarm in menu 4 "Reset alarms"
● Reset operating days in menu 3.1.4 or 8.1
"Filter" (select yes next to filter change in
menu)
See "Maintenance" for further information about
filter replacement.
Ice in heat exchanger - whether there is visible
ice on the heat exchang-
ers.
See section in EXact basic instructions for de-
icing principles. Consider changing the de-icing
method.
1.6.1 De-icing principle
The bypass valve allows a greater or lesser amount of outdoor air to circumvent the
heat exchanger and pass directly to the heating coil. A "snowflake" symbol ap-
pears in the HMI display or on the web server when the VEX is performing de-icing.
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2. Maintenance and servicing
2.1 Maintenance
The VEX door must be opened to allow servicing and cleaning.
Disconnect the power by removing the plug from the socket before
opening the door.
The fan motors will run on for up to 5 minutes.
NB Do not use aggressive cleaners or abrasive/sharp objects for
cleaning.
2.1.1 VDI 6022
To ensure a permanently hygienic and safe operation of the ventilation system, the
service intervals and measures stated in hygiene guideline VDI 6022 must always be
observed.
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2.1.2 Maintenance intervals
The following chart details the recommended maintenance intervals, The intervals
are a guide and based on normal operation. EXHAUSTO recommends maintenance
is adjusted to suit the actual operating requirements.
Component Procedure twice a
year
once a
year
Filters Both filters should be changed at the same time. Filters
should be replaced at least every six months.
X
The system should be cleaned when the filter is
changed.
X
Filter monitor Check that all the seals in the filter guide are tight. X
Seals and sealing strips Check that all the seals are tight. X
Fans and any heating coil Check that the fans run easily. X
Check the fans and any heating coil for dirt. Vacuum
the parts when carrying out cleaning. See section 2.3.
X
Counterflow heat exchang-
er
Check the heat exchanger for dirt and dust. X
Clean the heat exchanger, see section on removal and
cleaning of heat exchangers.
X
Condensation tray Check the condensation tray and clean with a damp
cloth.
X
Clean the condensation tray at least once a year. Fol-
low steps 2 and 3 in "Dismounting and mounting of
counterflow heat exchangers" for how to remove the
condensation tray for cleaning.
X
If a condensation pump is
fitted
Check the function of the condensation pump and its
correct position in the condensation tray.
X
If a condensation outlet has
been installed
Check that the drain outlet hose is not blocked. X
Remount the condensation tray and check that the
condensation pump works and that the system is wa-
tertight by pouring approximately 0.5 litres of water into
the condensation tray.
Grilles for supply and ex-
tract air
Remove the housing panels in front of the grilles annu-
ally. Remove dust, e.g. by vacuuming with a brush at-
tachment.
X
Other interior surfaces Dust and dirt inside the unit is removed with a vacuum
cleaner, swept out with a soft broom or wiped off with a
soft cloth. Do not use sharp or pointed objects.
X
Exterior surfaces To clean the HMI, PIR sensor and the external surfa-
ces of the unit, use a soft, well-wrung lint-free cloth.
N.B: use only clean water with ordinary dishwashing
liquid.
X
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2.2 Replacement of filters
Menu 3.1.4 + Menu 8.1 - Filter (monitoring with hour counter)
General Filter changes are monitored by an operating hours counter and indicated in
whole days.
Operating days:
Warning >
Alarm >
Change of filter >
Last changed:
Date
3.1.4 Filter
51d
80d
100d
No
17-05-2017
Operating days
since change
This shows the number of operating days since the last filter change
Warning This is where the number of operating days is set which must elapse before an
alarm on incipient filter soiling in the outdoor air and extract air filters is signalled.
The factory setting is 100 days.
Alarm This is where the number of operating days is set which must elapse before an
alarm for changing the outdoor air and extract air filters is signalled. The factory
setting is 100 days.
NB: When the warning is set to the same number of days as the Alarm, the system will
not signal a warning.
Filter change In the case of filter change, select "Yes", and the date for filter change will be
saved and the operating hours counter will be zeroised.
Menu 8.1 The same settings that can be configured in Menu 3.1.4 can be configured here.
2.3 Removing and cleaning the counterflow heat exchangers and heating
coils
2.3.1 Removing and cleaning the counterflow heat exchangers and heating coils
Warnings Disconnect power before opening door.
Handle with care The counterflow heat exchanger fins can be easily damaged -
avoid contact with the fins.
NB Do not use aggressive cleaners or abrasive/sharp objects for
cleaning.
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Handling tip
EXHAUSTO recommends: Handling
of the heat exchangers is much eas-
ier with the vacuum lifter shown
here.
Dismounting, cleaning and mounting of counterflow heat exchangers and heating coil
Step Action Photo
1. To open the door:
● Always open the door by
first undoing the lock fittings
(1) closest to the wall (next
to the rear lock fittings are
hinge fittings, which hold the
door in place).
● Then undo the front lock fit-
tings (2) and support the
door until it hangs vertically
down in the fittings.
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Dismounting, cleaning and mounting of counterflow heat exchangers and heating coil
Step Action Photo
2. If the VEX is fitted with a con-
densation pump:
● Dismount the level monitor-
ing socket. The socket is lo-
cated to the left of the VEX
next to the condensation
tray.
● Press the fixing bracket for
the pump down and remove
it.
● Lift the condensation pump
out of the condensation tray.
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Dismounting, cleaning and mounting of counterflow heat exchangers and heating coil
Step Action Photo
3. To dismount the condensation
tray:
●NB: Check whether there is
any condensate in the tray
before dismounting it – if so,
have a bucket ready below
the tray.
● Undo the four screws that
hold the condensation tray,
lift off the tray and empty it
of any water.
● If there is still water in the
condensation tray, wipe it
with a soft cloth.
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Dismounting, cleaning and mounting of counterflow heat exchangers and heating coil
Step Action Photo
4. To dismount the heat exchang-
er:
● Undo the two finger screws
which hold the plate in front
of the bypass valve.
● Undo the finger screws on
the bracket holding the
counterflow heat exchanger.
●Important! Make sure you
have a good grip on the heat
exchanger before sliding the
bracket aside (possibly with
the use of a vacuum lifter) –
the heat exchanger can now
be taken down.
● The actual bypass valve re-
mains in place while the
counterflow heat exchang-
ers are dismounted.
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Dismounting, cleaning and mounting of counterflow heat exchangers and heating coil
Step Action Photo
5. Cleaning the counterflow heat
exchanger:
● Clean the exchanger by
flushing with warm water (a
high-pressure cleaner can
be used). Max. water tem-
perature: 90°C.
●Note that the fins in the
heat exchanger are fragile,
so never direct the water
jet against the fins at an
angle.
● Check seal and replace if it
is worn or deformed.
6. Cleaning of heating coils and
internal parts:
● Dust and dirt inside the unit
is removed with a vacuum
cleaner or swept out with a
soft broom.
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Dismounting, cleaning and mounting of counterflow heat exchangers and heating coil
Step Action Photo
7. Assembly - insertion of heat
exchanger:
● First sit the heat exchanger
on the rail opposite the slid-
er bracket and push into
place. The slider rail can
now be pushed into place
and tightened. The finger
screws on the bracket hold-
ing the counterflow heat ex-
changer can also be tight-
ened.
Assembly - Tice sensor:
● It is important to check that
the Tice sensor is correctly
positioned between the heat
exchanger fins, as the sen-
sor will not measure correct-
ly otherwise. It is possible to
feel behind the heat ex-
changer next to the air in-
take fan to check the posi-
tion of the Tice sensor.
8. Mounting the condensate
pump in the condensation
tray:
● Place the pump in the con-
densation tray and press the
fixing bracket into place.
See Step 2 if needed.
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Dismounting, cleaning and mounting of counterflow heat exchangers and heating coil
Step Action Photo
9. Mounting the condensation
tray:
● Lift up the condensation tray
and mount with 4 screws.
● Plug in the level monitoring
socket.
● Make sure that the drain
outlet hose from the pump is
not pinched.
10. Assembly - when closing the
door:
● Pull the door forwards to
keep it away from the wall
and tighten the front lock fit-
tings (1) before tightening
the rear ones (2).
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2.4 Opening of partly integrated inspection hatch
Ste
p
Action Photo
1. To open the door:
● Always open the door by undoing the
lock fittings (1) closest to the wall
(next to the rear lock fittings are
hinge fittings, which hold the door in
place).
● Then undo the front lock fittings (2)
and support the door until it hangs
vertically down in the fittings.
● The lock fittings require a special
key.
2. ● Dismount the housing panels in both
end frames.
● Lift the housing panel free of the bot-
tom support and rotate it out at an
angle of approx. 35 degrees before
lifting it free of the fitting.
● Place the housing panels on a sur-
face that does not scratch.
3. ● Open the snap lock on both end
frames.
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Ste
p
Action Photo
4. ● First, open up the inspection hatch.
● Then tilt the two inspection hatch
holders out and down into the lock-
ing grille, one on each side.
5. Cleaning and assembly:
● Carry out the necessary inspection.
● Remove dust, e.g. by vacuuming
with a brush attachment.
● Close the inspection hatch and lock
the two snap locks.
● Mount the housing panels.
6. Assembly - when closing the door:
● Pull the door forwards to keep it
away from the wall and tighten the
front lock fittings (1) before tightening
the rear ones (2).
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