CorroVenta A1 User manual

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Contents
Area of use .......................................................................................................................................... 2
Delivery check ..................................................................................................................................... 2
Manufacture directive......................................................................................................................... 3
Safety information............................................................................................................................... 4
Relative humidity and its impact on materials.................................................................................... 5
How to select dehumidification technology for a given situation ...................................................... 5
This is how the dehumidifier works .................................................................................................... 6
Dehumidification process.................................................................................................................... 6
Overview, controls and connections................................................................................................... 7
Drying methods ................................................................................................................................... 8
General drying, room dehumidification.......................................................................................... 8
Drying framed flooring and beams ................................................................................................. 9
Suction drying................................................................................................................................ 10
Pressure drying.............................................................................................................................. 11
Installation......................................................................................................................................... 12
Maintenance and service .................................................................................................................. 13
Filter replacement ......................................................................................................................... 13
Accessories and consumables ........................................................................................................... 14
Fault tracing........................................................................................................................................... 14
Technical data ....................................................................................................................................... 15

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User instructions A1
Area of use
The A1 adsorption dehumidifiers have been developed and designed for drying water damage and
building moisture. A1 is a robust analogue machine with fewer functions than the sister machines in
the ES range.
The unit also has a folding handle with a holder for the electrical cable, while its light weight means it
is easy to carry and install. The durable but flexible feet protect the floor surfaces and make it
possible to stack the machines. The dehumidifiers have a naturally robust construction that gives a
long service life.
By using the adsorption principle, the dehumidifier does not have the same temperature
dependence as a condensing dryer. It also works well below the freezing point. Furthermore, an
adsorption dehumidifier can create dryer air, a greater difference between the water content of
incoming and outgoing air, than a condensing dryer. It can be used for drying rooms and, using
turbines, also for drying layered structures.
Properties:
•Energy efficient
•Service-friendly
•High capacity level
•MID-approved kWh meter
•Robust
•Very quiet
Delivery check
A1 is supplied with the following parts in the package:
Dehumidifier A1
1 x
Extra process air filter in addition to the one in
the dehumidifier
2 x
Manual
1 x

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Manufacture directive
The machines in the A1 range are CE approved.
Limitation of Liability
•Incorrect installation and/or incorrect use can cause property damage as well as injury.
•The manufacturer assumes no liability for property damage or injury incurred as a result of
failing to follow these instructions, the machine being used for purposes other than those
intended or failure to observe these warnings. Such damage, injury or liability is not covered
by the product warranty.
•The product warranty does not cover consumable parts or normal wear.
•The purchaser is responsible for checking the product upon delivery and before use to
ensure it is in good condition. The product warranty does not cover damages resulting from
the use of defective products.
•Changes or modifications to the machine must not be performed without written permission
from Corroventa Avfuktning AB.
•The product, technical data and/or installation and operating instructions are subject to
change without notice.
•These user instructions contain information protected by applicable intellectual property
laws. No part of these user instructions may be reproduced, stored in a retrieval system or
transmitted to third parties in any form or by any means without the prior written consent of
Corroventa Avfuktning AB.
Any comments regarding the content of this document must be sent to:
Corroventa Avfuktning AB Tel: [phone]
Mekanikervägen 3 Fax [phone]
SE-564 35 Bankeryd E-mail [email protected]
SWEDEN

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Safety information
This device is not intended for use by persons with reduced physical, mental or sensory impairments
nor other persons lacking the necessary skills or experience, unless supervised or instructed by
another person with responsibility for their safety.
Children may only use the device under the supervision of an adult to
ensure that the device is not used as a toy.
Electrical installations carried out in connection with the dehumidifier installation must be performed
by a professional in accordance with local and national regulations.
In addition, the following warnings and instructions must be read and followed:
1. The dehumidifier is only intended for indoor use.
2. The dehumidifier must not be powered on before installation is completed in accordance
with this manual.
3. The dehumidifier must not be covered because this may lead to overheating and fire.
4. The dehumidifier must not be used as a worktable, trestle or stool.
5. The dehumidifier is not intended to be stood or climbed on.
6. Never operate the dehumidifier without installing the filter as this may damage the
dehumidifier. Ensure that the filter is clean. If it is blocked, the machine may overheat.
7. Do not allow the dehumidifier to draw in alkaline chemicals or organic substances with a high
boiling point, such as oil, grease, solvents, boracol or similar. These can damage the rotor.
8. The dehumidifier may not be used in areas where it can produce explosive gases.
9. Do not insert objects into the intake or exhaust as this could damage the dehumidifier and
injure people.
10. Place the dehumidifier on a firm and flat surface so that it cannot overturn.
11. Keep children, animals and bystanders away from the workplace.
12. Contact the supplier if the dehumidifier is damaged or if the plug or the electrical cable are
damaged. Do not make any repairs yourself if you have not undergone the supplier's
training.
13. Do not damage the electrical cable. The cable must not run through water or over sharp
edges.
14. Never carry or drag the dehumidifier by the cable.
15. Using electrical equipment in very damp or wet conditions can be dangerous. Do not operate
the dehumidifier if it is standing in water.
16. The dehumidifier may only be connected to a grounded socket with voltage according to the
rating plate.
17. It is recommended to use an earth-fault breaker to minimise the risk of electric shock.
18. Water must not encounter the dehumidifier's electrical components. If it does, ensure that
they are dried thoroughly before the dehumidifier is used again.
19. Never open the dehumidifier for cleaning or service without first ensuring that the
dehumidifier is disconnected from power.
20. Repairs and maintenance of the dehumidifier's electrical system must be performed by a
qualified electrician.
21. Wet air hoses/pipes used and connected to the dehumidifier must be corrosion resistant and
able to withstand heat of 80°C.
22. The dehumidifier must not be used with accessories other than those described in this
manual or approved by Corroventa Avfuktning AB.
Contact the supplier of this dehumidifier for further advice on the safety and use of the product.

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Relative humidity and its impact on materials
All air contains a greater or lesser degree of moisture. We can’t see it with the naked eye until it
appears in the form of small water drops against a cold metal or glass surface for example. However,
before it is visible, moisture is already causing problems by affecting materials and manufacturing
processes, causing corrosion and growth of micro-organisms.
Air moisture is measured and usually given in relative humidity (% RH). It is a measurement of how
much water vapour the air contains over how much it can hold in total at a given temperature and
pressure. The higher the temperature, the more water the air can hold, but it is the relative humidity
that is calculated and must be controlled to prevent corrosion or mould growth.
At 100% RH the air is saturated, and the moisture falls in the form of small water droplets. Steel
corrodes at 60% RH and at 70% RH there is a risk of mould. A rule of thumb is that 50% RH is a good
climate for most materials.
How to select dehumidification technology for a given situation
The adsorption principle has the advantage of not having the same temperature dependence as
condensing dehumidification. Adsorption also works way below freezing, whilst condensing dryer
capacity decreases sharply with decreasing temperature, which is illustrated in the graph below to
the left.
As a general tip when choosing the technique for the relevant drying situation, it can be said that
adsorption dehumidification is the primary choice for drying in unheated spaces or when material
drying is required. The latter is justified by the adsorption dehumidifier producing dehumidifier air,
i.e. provides a greater difference between the incoming and outgoing air's moisture content
calculated in grams per cubic metre (ΔX), which can be seen using the graph to the right below and
which is decisive for the rate of drying. Layered structures are dried by the machine being installed,
with the turbine, for suction or pressure drying.
As the graph above shows, condensing dehumidifiers are used in hot and humid spaces if room
drying is required.

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This is how the dehumidifier works
The desiccant used in A1 is Silica gel, which can be regenerated an almost unlimited number of times.
Silicate gel is a crystal with a lot of microscopic pores that make the total surface very large. A single
gram has an active surface of 500 to 700 m2. Silicate gel is very powerful and can absorb a volume of
water of up to 40 % of its’ own weight. It is not water soluble and therefore cannot be washed away
or diverted to the passing air.
Dehumidification process
The desiccant is placed in a rotor (1). The air to be dried is sucked in through the inlet (2) by
means of a process air fan (3).
The air passes a filter and then the drying rotor, after which the dehumidified air goes through the
dry air outlet (4) to the area to be kept dry. The rotor has axially directed air ducts and consists of
a highly active desiccant, silica gel, bonded in a ceramic structure. The axially directed air ducts in
the rotor give laminar flow with minimal pressure drop.
The rotor rotates by means of a drive motor (5) and a drive belt (6). The moisture that
is adsorbed in the rotor is driven out by a small portion of the process air being heated by the
heater (7) and then passing a smaller part of the rotor, which is thus regenerated and cleaned by
the countercurrent principle.
The wet air is removed via the outlet (8) to the surroundings.

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Overview, controls and connections
The images below show Corroventa A1 with its external and internal parts and controls.
1. Process air filter 7. Fan speed High/Low
2. Process fan 8. Operating mode Manual/hygrostat
3. Rotor 9. Hygrostat outlet
4. PTC heater 10. Electrical connection
5. Rotor drive motor 11. Process air hatch
6. MID approved energy meter 12. Dry air hose
13. Wet air connector
A1 is a small energy efficient, powerful adsorption dehumidifier that is practical and easy to position,
developed to be compact and ideal for the dehumidification of smaller localized water damage such
as in bathrooms, under sinks etc. Also suitable for climate control in smaller spaces such as storage
rooms, garages, summer cottages that are closed for the winter etc.

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Drying methods
The following outlines the basics of different drying methods that can be applied to A1 and, in some
cases, additional equipment from Corroventa's product range. The descriptions are only an overview,
and in the event of any doubt about how any given situation should be handled please consult an
experienced dehumidification technician.
General drying, room dehumidification
An adsorption dehumidifier like A1 produces such dry air that an air turnover of between one and
two times per hour are enough, compared with condensing dryers where turnover should instead be
between three and four times per hour. Approx. 140 m3/h is enough for a room with a 25 to 30m2
area if the roof height is 2.5 meters.
As with all dehumidification, regardless of type or model, it is important to ensure that the area to be
dehumidified is well sealed so that the process is performed as fast and as energy efficiently as
possible. Windows and doors to the area must be closed, and if there are not any, plastic or other
temporary partitions must be used.
If the extent of the damage is limited. it is advisable to cover it with plastic and let the dry air flow in
under the plastic via a hose. Leave openings at the edges where the air can exit. This makes the
process faster and consumes less energy.
Cover local damage with plastic when drying to increase the drying rate and
reduce energy consumption.

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Drying framed flooring and beams
For framed flooring and beams with easy-to-dry insulation, for example, glass wool, A1 can be used
with a high-pressure fan such as HP2000 according to the schematic diagram below. Remember that
the capacity of this fan far exceeds that of the dehumidifier and therefore allow the fan to "draw the
bad air". The diagram below shows this by the dry air hose from the dehumidifier to the right not
being connected directly to the fan but placed next to it instead. In this way, the fan can draw
enough air without drawing excess air through the dehumidifier affecting its function and efficiency.
Drying beams using a fan. Note that the dehumidifier to the right is not
directly connected to the fan. The dry air hose is only placed close to the
fan.

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Suction drying
When suction drying layered structures, use A1 together with a turbine according to the schematic
diagram below. Connect the turbine or turbines so that they draw air out of the layered structure via
hose system, water separator and filter, and then evacuate the air via the hose out to the
surroundings. Place the dehumidifier in the room and route its wet air hose out of the room
normally. In this way, the turbine will draw in dry air into the layered structure and this is how the
method got its name.
Use of a water separator is crucial to prevent water being sucked into the turbine and damaging the
motor.
Suction drying. The dehumidifier dries the air in the space and the turbines draw air
out of the layered structure, resulting in dry air being drawn down into it.

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Pressure drying
When pressure drying, use A1 together with a turbine according to the schematic diagram below.
Pressure drying is two to four times faster than suction drying and is therefore the primary choice for
a layered structure if there are no obstructions.
Pressure drying. The turbine is fed with dry air from the dehumidifier and forces
it into the layered structure.
During pressure drying, dry air is routed from A1 to a turbine and then forces this air into the layered
structure. In this way, warm and dry is forced down into the structure, which achieves the material
temperature and thus increases the rate of the drying process. Wet and cool air leaks into the room
through the gaps between the floor and the wall or via drilled check holes and is then re-sucked into
the dehumidifier as process air.
Before starting pressure drying, suction drying is required to evacuate all free-flowing water so that
this is not forced into other parts of the structure. Furthermore, it is important to balance the turbine
capacity with the dehumidifier's so that not too much air is drawn through the latter, which
interferes with its function and performance.
Pressure drying may release fibers/particles from the layered structure into the indoor air and if this
is a potential problem another method should be applied.

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Installation
Place A1 on a flat and level surface, so that it cannot tip over causing damage to the machine or
other property or injury to people.
Connect a hose to the wet air connector to lead the wet air out of the space to be dried. The wet air
hose should have a smooth inside and should be as short as possible, no longer than 4 meters, for
optimum function and highest capacity. If a longer wet air hose is necessary for the installation, the
high static pressure that the machine has is capable of dealing with a hose of up to six meters but the
dry air must then be restricted, in order to maintain the wet air flow which is crucial for the
machine's dehumidification capacity.
1. In the event of problems with condensation in the
wet air hose, if best solution of shortening the hose
is not possible, this can be alleviated by restricting
the dry air slightly, which leads to an increased
volume of wet air. Performance is reduced slightly
so this method must be evaluated from case to
case. Another method is to make holes in the hose for
the condensation and to use a container.
Installation in brief (also see page 7, Overview, controls, and connections):
1. Place the dehumidifier in a location where the wet air hose reaches the intended evacuation
point. Ensure that it is on firm and level ground so that it cannot tip over.
2. Connect the cable to 1-phase, 230 V electrical socket fused to 10A or maximum 16A. As the
machine is usually used in damp, wet areas, the use of an earth-fault breaker is strongly
recommended.
3. Set the machine to Manual (Man) mode with the left button on the control panel. Check that
the fan starts by the machine blowing air. Look into the wet air connector and check that the
rotor rotates anti-clockwise. Hold your hand by the wet air connector and check that the wet air
feels warm. Note that the machine needs to run a few minutes before this can be checked.
4. Connect the wet air hose and route it out through the intended evacuation point (hole in the
wall, window, or whatever is relevant). Ensure that the hose not trapped or obstructed
anywhere.
5. If using a hygrometer, connect it to the hygrometer connector on the control panel and set the
desired setpoint value. The Man/Hyg button must also be in the Hyg. position.
6. Inspect the installation and if there are no faults and, if not already connected, reconnect the
cable in the electrical socket so that the dehumidifier starts.
The wet air must always be evacuated via
hose out from the space to be dried. The
image shows room drying.

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Maintenance and service
Filter replacement
The dehumidifier filter should be replaced regularly, preferably between each work assignment in
order to maintain energy efficiency and to avoid overheating. If the air filter is extremely dirty it must
be replaced more often.
1. Disconnect the power from the dehumidifier.
2. Replace filter through the connector on the process hatch. Pull out the dirty filter from the
machine and insert the new one.
3. Reconnect the power to the dehumidifier.
Replace filter through the
connector on the process
hatch.

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Accessories and consumables
The following parts are available as accessories and consumables for A1:
Fault tracing
Fault symptom
Probable cause
Actions
Premises not
dehumidified/low
capacity.
Depending on the situation,
the cause of the problem
could be incorrect
installation, e.g. because of
obstructed wet air hose,
clogged filter, incorrect
settings on the machine or
machine fault.
Perform fault tracing as follows until the
problem has been identified:
Check the installation - check that the wet
air hose is not obstructed, that the dry air
damper is in the correct position and that
the hose used on the dry air side is not
trapped or clogged. Ensure that the air flow
is correct.
If the air flow is weak, check the process air
filter and replace if necessary.
The dehumidifier
does not start.
The dehumidifier is set to
Hyg. without the hygrostat
connected.
Connect a hygrostat, or switch to Man.
mode.
The rotor rotates
anti-clockwise (seen
through the dry air
outlet) or not at all.
Fault with rotor motor or
motor capacitor.
Contact the dealer for repair.
No air flow, low air
flow
Fan error.
Contact the dealer for repair.
Article number
Designation
9901100
Hygrostat, HR1-5
9901150
Hygrostat, HMH 1-10
1004503
Carry strap
9900799
Quick clamp PA66 black 97.7-102.1
9900795
Quick clamp PA66 black 48.5-53.8
1004493
Process air filter

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Technical data
A1
Dry air volume (m3/h) high/Low
140/100
Drying capacity at 20°C, 60 % RH (litres/day) high/Low
9/6
Ø dry air outlet (mm)
1 x 98
Ø wet air outlet (mm)
50
Ø Process connector (mm)
125
Sound level, normal operation dBA (3 m) high/Low
approx. 48/42 *
Voltage
230 VAC/50 Hz
Rated output (W)
600
Consumption (W) high/Low
550/400
Length x width x height (mm) incl. connectors
310 x 253 x 287
Weight, kg
8.5
*Sound level varies depending on the installation.