CorroVenta CTR STD-TT User manual

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Crawl space dehumidifier
CTR STD-TT
User manual

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Contents
Area of use .......................................................................................................................................... 3
Manufacture directive......................................................................................................................... 3
Safety information............................................................................................................................... 5
Relative humidity and its impact on materials.................................................................................... 6
How the dehumidifier works............................................................................................................... 7
Delivery check ..................................................................................................................................... 8
Overview, controls and connections................................................................................................... 8
Installation planning............................................................................................................................ 9
Installation......................................................................................................................................... 10
External and internal preparations ............................................................................................... 10
Dry air duct .................................................................................................................................... 10
Installing the dehumidifier and its connections............................................................................ 12
Maintenance and service .................................................................................................................. 14
Filter replacement ......................................................................................................................... 14
Checking rotor operation .............................................................................................................. 14
Checking heater............................................................................................................................. 15
Accessories ........................................................................................................................................ 16
Fault tracing....................................................................................................................................... 16
Technical data ................................................................................................................................... 18

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Crawl space dehumidifier CTR STD-TT
Area of use
CTR STD-TT crawl space dehumidifier is intended for permanent installation in crawl spaces with the
primary purpose of preventing the build up of mould and rot in the building construction by
dehumidifying. By using the adsorption principle for drying the air in the space, the dehumidifier is
effective at low temperatures and it also works just below freezing. A crawl space dehumidifier like
this shall be dimensioned for 1.5 to 2 air exchanges per hour, which makes CTR STD-TT suitable for
crawl spaces with a volume of up to 180 150m3.
For the user's comfort, for control and monitoring of the dehumidifier's operation and function, the
CTR STD-TT is developed for use with Homevision® Pro or Homevision® Lite. These contain control
units, which are connected by cable to the dehumidifier as well as to a wireless control panel
mounted in the living area. The control unit is equipped with a thermometer and hygrometer and
independently controls operation of the dehumidifier. The system can be monitored and operational
settings adjusted via the control panel. The control panel also shows any operational alarms and
service reminders, such as filter replacement.
Properties:
•Energy efficient
•Service-friendly
•High capacity level
•Time meter
•Robust
•Homevision® Lite/Pro connection
•Very quiet
Manufacture directive
Crawlspace dehumidifier CTR STD-TT is CE marked.
Disclaimer
•Incorrect installation and/or incorrect handling can cause property damage as well as injury.
•The manufacturer assumes no liability for damage arising as a result of failing to follow these
instructions, not using the machine as intended. Such damage is not covered by the
warranty.
•The warranty applies to damage to the machine caused by material or manufacturing defects
and does not cover consequential failure.
•The warranty does not apply to consumables or to normal wear.
•It is the responsibility of the purchaser to inspect the goods upon delivery and to ensure its
function according to the instructions in the manual during use.
•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 copyright laws. No part of this
document may be reproduced, stored in an information storage system or transmitted in any
way or by any means without Corroventa AB's written consent.

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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
The equipment can be used by children aged eight (8) years and above and by people with reduced
physical or mental abilities or with lack of experience on the condition that they have received
instructions and information on how it is used safely and that they understand the risks involved
with its use.
Children must not play with the equipment. Cleaning and maintenance must not be carried out by
children without the supervision of an adult.
Electrical installations carried out in connection with the dehumidifier installation must be performed
by a professional in accordance with local and national regulations.
The following instructions must also be observed:
1. The dehumidifier must not be powered on before installation is completed in accordance
with this manual.
2. The dehumidifier must be connected to an earthed electrical socket, 1-phase 230VAC, 50Hz,
with a maximum 16A fuse.
3. The dehumidifier must not be covered because this may lead to overheating and fire.
4. The dehumidifier must not be used as a work table, 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 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 stable and level bracket or shelf 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. Always use an earth-fault breaker to minimise the risk of electric shock.
17. Water must not come into contact with the dehumidifier's electrical components. If it does,
ensure that they are dried thoroughly before the dehumidifier is used again.
18. Pipes or hoses used to route wet air from the dehumidifier must withstand a temperature of
at least 80°C.
19. Never open the dehumidifier without first ensuring that the dehumidifier is disconnected
from power.
NOTE! Any modifications that affect the ventilation or pressure balance of a property
can lead to changes in radon gas concentrations. When a dehumidifier is placed in a
property with radon, contact a specialist to ensure a suitable overall solution.

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20. Servicing and repair of the dehumidifier must be carried out by authorised personnel.
Contact the supplier for further information.
21. 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.
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. It can be taken for granted that the
Nordic climate is always humid. Large areas of water, in the shape of thousands of lakes and the
surrounding sea, cause a lot of humidity.
Air moisture is measured and usually given in relative humidity (% RH). This is a measurement of how
much moisture the air contains compared to 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 which is calculated, and which must be controlled.
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 but here in Scandinavia, it is rarely so low. The annual average value in
most places is instead around 80% RH and can be equally high in both summer and winter.
Moisture problems in crawl spaces and appropriate actions
When outdoor air, particularly during the warm times of year, enters the crawl space under the
house it is cooled by the cool environment and the relative moisture increases. In extreme cases
condensation and water droplets form.
Additional moisture can also occur through evaporation from ground surface or from the
surroundings via the foundation wall. And, of course, water can penetrate crawl spaces from
surrounding ground.
The solution to these problems is the installation of a crawl space dehumidifier, a remedy that, for
optimum results and operating economy, is best combined with the following:
•Downpipes that exit close to the crawl space are directed away to route the water away
preventing it from entering the space.
•The ground surface in the crawl space is covered with a plastic sheet to prevent evaporation
from the ground. Each missed, non-sealed, square meter of ground surface can mean a
surplus of moisture of more than two litres of water per day.
•Vents and cracks in the crawl space are sealed to prevent outdoor air from entering.

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How the dehumidifier works
The average temperature in a crawl space is low, something which makes the adsorption
principle used in the CTR STD-TT superb compared to dehumidifiers whose efficiency falls
significantly when the temperature falls. The adsorption principle thus provides effective
dehumidification at temperatures well below freezing.
The fixed desiccant that is used in CTR STD-TT is silica gel, which can be regenerated an
almost unlimited number of times. Silica gel is a crystal with many small microscopic pores
giving the crystal's walls a massive surface area. A gram of this substance has a moisture
absorption areas of 500 - 700m2, which means that the desiccant in a CTR STD-TT has a
total drying area of approx. 43,000 m2. Silica gel can absorb a lot of moisture, up to 40% of
its own weight. It is not water soluble and therefore cannot be washed away or blown out
with exiting airflows.
The 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
also cleaned by the countercurrent principle.
The wet air is removed via the outlet (8) to the surroundings.

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Delivery check
CTR STD-TT is supplied with the following parts in the package:
Crawl space dehumidifier CTR STD-TT
1 x
Rubber trim
2 x
Extra filter in addition to the one in the
machine
2 x
Manual
1 x
Depending on the configuration purchased, the packaging also contains Homevision® Pro or
Homevision® Lite, the component parts of which are shown in separate manuals.
Note: If this has not already been done, consider obtaining an Installation kit TT Multi, for a simple,
energy efficient and well-functioning installation.
Overview, controls and connections
The images below show CTR STD-TT with its external parts and controls.
Time meter
Connector,
Homevision®
Process air intake
with filter
Wet air connector
Dry air connector
Filters

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Installation planning
Before starting the installation, it is recommended to establish an installation plan for best results
and minimum energy consumption. In this regard the dehumidifier is best placed beside an external
wall in the crawl space so that:
-there is effective distribution of the dry air with as simple a dry air duct as possible
-hose routing for wet air is easy and any existing lead-ins to the crawl space can be used
-the machine is easy to access for maintenance and servicing, e.g. filter replacement
-the control unit can be placed so that it is not affected by the dry air, giving incorrect measurement
values.
Note that:
The dry air duct must end one metre from the proposed dehumidifier location.
The lead-in in the foundation wall must be about 60-70 centimetres from the
dehumidifier and as high up as possible, so that the outlet is not covered by vegetation,
leaves in autumn or snow in winter.
Establish a scale drawing or diagram of the crawl space and draw in the proposed installation. Using
this, verify that the distance between the dry air duct and external foundation in general is three to
four metres. The first third of the dry air duct's length, the part nearest the dehumidifier, is left free
from nozzles. 12 up to a maximum of 14 nozzles are then distributed along the remaining length.
Remember that the dry air must be evenly distributed in the space and that the air must move freely
in all parts of the crawl space. Direct the nozzles mainly towards the foundation wall and in a
direction away from the dehumidifier. Be careful to direct the nozzles towards all corners of the
space where the air can otherwise be still.
The reason why the dry air duct must be at a distance from the foundation walls is that the main part
of the dehumidifier's capacity must be used for the air, the climate, in the space and not for drying
the material of the foundation walls. The reason why the first nozzle is placed at a distance from the
dehumidifier is that the control unit must be placed in close proximity to it and not be directly
affected by the dry air, which would give incorrect measurement values and thus incorrect control.

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Remember during the planning phase that the complete installation, except the dehumidifier,
Homevision® control system and Installation kit TT Multi, also covers spiral pipes, bends and
mounting materials etc. according to the diagram for the dry air duct. Furthermore, suitable material
for sealing all vents and cracks in the crawl space is needed as well as durable plastic sheeting large
enough to cover the entire ground surface in the crawl space. Durable tape is one of the possible
options for sealing the plastic joints.
As part of the installation work, any downpipes that exit close to the crawl space are directed away
and rainwater routed away, to prevent water entering the space.
Installation
External and internal preparations
This installation description assumes that any downpipes that exit close to the crawl space have been
directed away, so that rainwater is now routed away and no longer penetrates the crawl space.
Furthermore, any vents and cracks in the crawl space have been sealed to prevent outdoor air from
entering.
The entire ground surface in the crawl space is covered with durable plastic sheeting. Be thorough
with the installation and ensure good sealing by overlapping and using durable tape or another
suitable method. Install the plastic right up against the foundation wall. In the example illustrated
below, the seal against the foundation walls has been achieved by clamping the plastic sheeting using
a timber batten. Remember that every missed, uncovered square metre can cause a surplus of
moisture of two litres per day, depending of course on ground conditions and season.
Dry air duct
As described under Installation planning, the dry air duct, normally a spiral pipe, is installed to spread
the dry air throughout the entire crawl space area. The dry air duct must start about 1 metre from
the proposed dehumidifier location as the dry air hose is 1.2 metres long. The hose connection
between dehumidifier and dry air duct prevents vibrations and thus noise from spreading through
the duct.
The first third of the dry air duct's length, the part nearest the dehumidifier, is left free from nozzles.
12 up to a maximum of 14 nozzles are distributed along the remaining length, positioned so that the

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dry air is spread throughout the whole crawl space. Remember that the dry air must be evenly
distributed in the space and that the air must move freely in all parts of the crawl space. Direct the
nozzles mainly towards the foundation wall and in a direction away from the dehumidifier. Ensure
that nozzles are directed towards all corners of the crawl space.
Note: Installation kit TT Multi contains 16 nozzles but only 12 to 14 will be used with CTR STD-TT.
Do not forget to install covers or seal the dry air duct's lower exit in another way, as per the example
in the right-hand image below. If this is not done, the dehumidifier's efficiency worsens, the energy
consumption increases and the majority of the air goes out at one point, whereupon the air in other
parts of the crawl space can become still with resulting localised moisture problems.

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Installing the dehumidifier and its connections
Note that any electrical installations carried out in connection with this work must be
done by a qualified electrician in accordance with local and national regulations.
CTR STD-TT must be connected to an earthed, single phase 230VAC/50 Hz socket with a
maximum 16A fuse. An earth-fault breaker is recommended with consideration of the
environment in the crawl space.
The following instructions are based on using the TT Multi installation kit. Images and diagrams
contain parts from this product.
Outside the house:
Install the wall plate with the pipe in through the hole in the foundation wall that was made for this
purpose, or that possibly was there from before. Secure the plate with screw and plug from the
installation kit.
Install the 45° pipe bend with protective grille and turn it in the desired direction. Check that the
outlet is clear and not too close to the ground, so that the air flow is not obstructed by vegetation,
leaves in the autumn and snow in the winter. The pipe must be bent downwards or diagonally
downwards to prevent rain penetrating the space and entering the hose that is installed on the
inside.

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In the crawl space:
Wall brackets
In the location where the dehumidifier is to be installed, approx.1 metre from the dry air duct and a
maximum of 0.7 metres from the wet air outlet in the foundation wall, use the hole template
supplied with the installation kit and mark out the position of the holes. Ensure that the distance
between the installed dehumidifier's upper edge and the roof (sub floor/blind floor) is at least 50 mm
so that air can flow between them. Do not install higher than this, because it can cause a risk of
overheating. If appropriate on site, the dehumidifier can be turned the other way, that is turned
upside down on the brackets.
Drill out the four Ø12 mm holes according to your markings and insert the supplied plugs. Screw the
wall mountings in using the four coach screws supplied. Position the four self-adhesive rubber strips
supplied with the dehumidifier on the wall mountings and then place the machine on these.
Wet air hose
The silencer hose is installed at a slight bend between the wet air connector and the Ø80 mm pipe
that enters through the foundation wall from the installed wall plate. Carefully make a small hole in
the outer sheath of the hose at the lowest point of the hose so that any condensation can run out.
Take care when doing this, so that the hose is not pressed together preventing the air flow through
the hose.
Correct installation, slight bend. Incorrect installation, sharp bend

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Dry air hose
Insert the nipple in the dry air hose and tighten with a hose clamp. Press the nipple in the dry air
duct. Install the other end of the hose on the dry air connector on the dehumidifier using a hose
clamp.
Control unit
When using the Homevision® control unit, it must be installed at approximately half the height of the
crawl space in a location that is not directly affected by dry air or radiation from hot or cold surfaces,
so that the measured temperature and humidity values are as accurate as possible. The control unit
is connected to the dehumidifier by a cable. For further information about Homevision®, see its
manual.
Electrical cable
The dehumidifier is connected, when the installation work is completed, to an earthed single phase
socket, 230VAC, 50 hz, with maximum 16A fuse. The socket that is used is recommended to be
protected by a earth-fault breaker.
Maintenance and service
Filter replacement
The dehumidifier's filter must be replaced regularly, at least once a year. If the air filter is extremely
dirty it must be replaced more often.
1. Disconnect the power from the dehumidifier.
2. Without using a tool, pull out the dirty filter from the machine and slide in the new one.
3. Reconnect the power to the dehumidifier.
As a routine, also check the outlet at the outside of the foundation wall after replacing the filter,
ensure that it is always unobstructed so that air can flow out freely.
Checking rotor operation
Where warranted, in event of repeated overheating when the heat protection has tripped, check
that the rotor rotates according to the following instructions.
As this inspection must be carried out with the dehumidifier powered, the utmost
caution must be observed. Do not insert your fingers or any tools into the machine!

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1. Because the dehumidifier is connected to the power supply, remove the wet air hose from
the machine using tools.
2. Using a torch, look into the machine through the connector, the pipe on which the hose was
installed, and verify that the rotor rotates slowly. (The rotor's interior can be liked to a
honeycomb structure)
3. Reinstall the wet air hose. If the rotor does not rotate, contact the dealer for repair.
Checking heater
Where warranted, Homevision® control panel gives a warning in the event of too high humidity,
checks that the heater in the dehumidifier is working as intended.
1. When Homevision® control panel indicates that the dehumidifier is working, place your
hand next to the wet air hose outlet by the foundation wall and verify that the air there is
warm and humid.
2. If the air feels cold, the dehumidifier needs repairing. Contact a dealer.
If in doubt, due to prevailing weather conditions, about whether the air at the outlet is warm or not,
follow the instructions below:
As this inspection must be carried out with the dehumidifier powered, the utmost
caution must be observed. Do not insert your fingers or any tools into the machine!
1. When Homevision® control panel indicates that the dehumidifier is working, remove the
wet air hose from the machine with tools.
2. Place your hand in front of the connector, the pipe on which the hose was installed, and
verify that the air feels warm and humid.
3. Reinstall the wet air hose. If the air feels cold, the dehumidifier needs repairing. Contact
your retailer.

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Accessories
The following parts are available as accessories and consumables for CTR STD-TT:
Fault tracing
Fault symptom
Probable cause
Actions
Connection of control
panel failed at instal-
lation. The control unit
does not come up in
the list of available
devices that is
presented on the
control panel.
The control unit has already
been powered for longer
than two minutes and is
therefore not available for
connection.
Restart the control unit by disconnecting
the current to it for a couple of minutes.
Restart it again and try connecting the
control panel.
The dehumidifier does
not start when the
connector is connected
and Homevision®
control panel does not
connect to the control
unit.
Power connection and/or
control unit connection
Check that there is voltage in the electrical
socket in which the dehumidifier is
connected, that the fuse has not blown.
Check that the cable to the control unit is
correctly installed in the dehumidifier. This
connector has a key that guides its position
so turn the connector until it reaches the
correct position and tighten.
Homevision® control
panel gives a warning
that the dehumidifier's
heat protection has
tripped.
The air flow through the
machine has been
insufficient, which has
caused the temperature to
rise.
Check the filter and, if necessary, replace it.
The dehumidifier restarts automatically
when its internal temperature has dropped.
If the fault persists after the above action:
Check that the wet air duct is unobstructed,
that the wet air hose is not pinched or
sharply bent and that nothing blocks its
outlet on the outside of the crawl space.
If the above does not restore operation,
check that the rotor in the dehumidifier still
rotates. Follow the instructions under
Service and maintenance in this manual.
Part number
Designation
1000926
Filters

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Fault symptom
Probable cause
Actions
Homevision® control
panel gives a warning
that the humidity in
the crawl space is too
high.
The humidity in the crawl
space exceeds the set
alarm level.
Before further action, check that the alarm
level set in the system is relevant, that the
humidity now found in the crawl space is a
problem.
Check that the air leaving the wet air hose
outlet by the foundation wall is warm and
humid, see instructions under Service and
maintenance in this manual.
Check that the wet air hose is correctly
installed and has not come loose from the
dehumidifier.
Check that the rotor in the dehumidifier
still rotates. Follow the instructions under
Service and maintenance in this manual.
Check the dry air distribution in the crawl
space, that the dry air is still freely
distributed via all nozzles in the entire
space according to the installation
description. If, for example, one of the
pipe's end plates has fallen off, the
necessary air distribution is not achieved.
Check that the ground surface in the space
is evenly covered by plastic and that any
downpipes that exit close to the crawl
space are directed away to prevent
rainwater from entering.
If the problem persists, the dehumidifier's
capacity may be insufficient for the
additional moisture and should be
swapped for a larger unit from the model
program.
Connection of control
panel failed at instal-
lation. The control unit
does not come up in
the list of available
devices that is
presented on the
control panel.
The control unit has been
powered for longer than
two minutes and is
therefore not available for
connection.
Restart the control unit by disconnecting
the current to it for a couple of minutes.
Try connecting to the control panel again.

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Technical data
Dry air volume (m3/h)
200 – 220 *
Wet air volume (m3/h)
30 – 40
Drying capacity at: 20°C, 60% RH (litre/24 hrs/ kWh/litre)
17 / 1.10
10°C, 60% RH (litre/24 hrs/ kWh/litre)
13 / 1.44
5°C, 60% RH (litre/24 hrs/ kWh/litre)
11 / 1.70
Sound level, dBA 3m
Approx. 56 **
Connection
230VAC/50 Hz
Connection effect
860W
Consumption during drying, normal operation
Approx. 775W
Height x width x length (mm)
290 x 455 x 325
Weight, kg
15
*A crawl space dehumidifier like this shall be dimensioned for 1.5 to 2 air exchanges per hour, which
makes CTR STD-TT suitable for crawl spaces with a volume of up to 150 m3.
**Sound level varies depending on installation.
Type LAF 50 LAF 50E LAF 50E2 LAF 100 LAF 100E LAF 150 LAF 150E