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Technology and products for remediation of radon, moisture and odours
TECHNICAL DESCRIPTION
DEHUMIDIFIERS FOR CRAWLSPACES
CTR 500TT
Developed and manufactured by Corroventa Avfuktning AB
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Technical description of CTR 500TT dehumidifier for crawl
spaces
1. How are different materials affected by moisture?
2. How can one effectively eliminate mould and odours in a house
with a crawl space?
3. Description of dehumidifier CTR 500TT
a) Function
b) Construction external
c) Construction internal
d) Control panel
4. Technical data for dehumidifier CTR 500TT
5. Installation
a) Location of CTR 500TT
b) Duct system
c) Connection of control panel, hygrostat section
d) Connection of control panel, indicator box
6. Operation and care
a) Start
b) Maintenance, service
c) Overheating
d) Operation and service journal
7. Installing control panel
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1. HOW ARE DIFFERENT MATERIALS AFFECTED BY MOISTURE?
All air contains a greater or lesser degree of moisture. We can’t see it with the naked eye before
it appears in the form of small water drops against a cold surface of metal or glass. But before
moisture is visible, it 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.
The difficult term of relative humidity
Air moisture is measured in relative humidity (% RH). This is a measurement of how much
water the air holds at a particular temperature. At 100% RH the air is saturated and the moisture falls in the form of small water droplets. But steel starts to corrode at 60% RH. At 70%
RH there is a risk of moulding. A rule of thumb is that 50% RH is a good climate for most
materials. But in the North, it is rarely 50% RH. In most places in the Nordic countries the average for the year is around 80% RH. The high relative humidity does not disappear in cold Nordic
climates either. It can be equally high in winter or summer. And it is the relative humidity that
counts.
2. HOW CAN ONE EFFECTIVELY ELIMINATE MOULD AND ODOURS IN A HOUSE WITH
A CRAWLSPACE?
When outdoor air, particularly during the warm times of year, enters the crawl space (D) under
the house it, is cooled by the cool environment and the relative moisture increases and, therewith, the risk of mould attack and odours. By drying the air, so that the relative humidity
remains below 70%, mould can be prevented.
The air in the crawl space is sucked into
the dehumidifier (A). The dry air (B) must
be distributed in such a way that the crawl
space remains dry. At the same time as
the dehumidifier dries all the air it
removes all moisture (C) from the crawl
space to the surroundings.
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3. DESCRIPTION OF DEHUMIDIFIER CTR 500TT
a) Function
In a crawl space one is dependent on a dehumidifier with a constant flow of dry air so that
mould does not form. This is achieved using a rotating dehumidifier, type Corroventa CTR
500TT. The regeneration process is continuous. The dehumidifier is not dependent on the air
temperature. The air can also be efficiently dehumidified far below freezing point. The fixed
desiccant that is used is silica gel and can be regenerated a nearly unlimited number of times.
Silica gel is a crystal that can absorb a lot of moisture, approx. 40% of its own weight. There are
different types to choose from for different areas of use. Inside the crystal there are lots of
small microscopic pores. This means that the surface area of the walls inside the crystal is very
large. One gram of silica gel has a moisture absorbent surface of 500 - 700 m2 .
A CTR 500TT dehumidifier contains desiccant with a total drying aera of approx. 600,000 m2.
The dehumidifier is used to dry atmospheric air using the adsorption principle.
The adsorption rotor
The rotor has axially directed air ducts and consists of a highly active desiccant bonded in a
ceramic structure. The desiccant is not water soluble and therefore cannot be washed away or
blown out with exiting airflows.
The axially directed air ducts in the rotor give laminar flow with minimal pressure drop.
The dehumidification process
The desiccant is placed in a rotor (6). The air to be dried is sucked in through the inlet (3) by
means of a process air fan (10). 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 rotates
by means of a drive motor (7) and a drive belt (8). The moisture that is adsorbed in the rotor is
driven out by a small portion of the process air being heated by the heater (15) and then passing a smaller part of the rotor, which is thus regenerated. The wet air is removed via the outlet
(17) to the surroundings.
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b) Construction external
Corroventa's adsorption dehumidifier CTR 500TT is specially designed for use in crawl spaces
where the requirements are more stringent regarding durability, operational reliability and service life. It is therefore especially strongly-constructed both externally and internally, see the
front page.
CTR 500TT is manufactured from strong sheet steel and is powder coated both internally and
externally. It comes with a practical carrying handle. The front of the dehumidifier consists of:
- 5 m oil and weather resistant cable with earthed plug for connection to an earthed
220 V socket, 1-phase alternating current 50Hz
- Hygrostat socket that fits Corroventa’s own control panel.
- Run time meter that registers the time when the dehumidifier is connected.
- Inlet for process air, that is the air to be dried
- Filter door. To change the filter, open the quick release on the door after which the fil-
ter can be changed. Inside the filter is a rating plate with the dehumidifier's serial
number.
- Outlet for wet air
On the rear of the dehumidifier there are two Ø100mm outlets and three Ø50mm outlets for
dry air. The external connectors are made of 2 mm sheet steel and suitable for standard dimensions of spiral pipes, plastic pipes and spiral hoses.
Dehumidifier CTR 500TT has four elastic rubber feet.
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c) Construction internal
Electrical equipment is located in an internal distribution box and the rotor unit is attached to
this by a quick release connector. The rotor unit contains the rotor (6), drive motor (7), drive
belt (8), heating element (15) and covers (12,13), that is to say all internal components close to
the fan (3).
The parts referred to in the schematic images are described in more detail below.
(5) Elastically secured removable ”drying pack”
(6) Drying rotor with hub, bearing, spokes and blades
(7) Drive motor with pulley for drive belt
(8) Toothed drive belt
(9) Rotor seal that forces air to pass through the drying rotor
(10) Process air fan. There is a grille and filter between the process air fan and the process
air inlet (3)
(12) Heat cover that traps part of the process air for regeneration of the drying rotor
(13) Collection cover for wet air
(15) Heating element
(20) Rotor stay to secure the rotor in the drying pack. The rotor shaft is secured in the
middle of the rotor stay
(21) Bent panel to facilitate air flow and thereby reduce flow losses
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Process air in. The connection has an external dimension of 2 x Ø 125 mm suitable for
standard spiral pipes and spiral hoses.
Dry air out. The connections have an external dimension of 2 x Ø 100 suitable for
standard spiral pipes and spiral hoses and 3 x Ø 50 mm suitable for
standard plastic pipes and spiral hoses.
Wet air out. The connection has an external dimension of Ø 76 mm.
d) Control panel
For extra monitoring, the dehumidifier is equipped with a control
panel that is placed in a suitable location in the house, see front
page.
As long as the relative humidity is not too high (i.e. there is no risk of
mould) a green lamp lights.
If the moisture content should exceed the critical limit for mould,
because the dehumidifier does not work or the moisture load in the
crawl space is too great, a red lamp lights.
A green lamp also lights as long as the ventilation in the crawl space is functioning.
If the ventilation does not function because the fan does not have power the light goes out.
To ensure the function of the fan, manual checks should be made at the dehumidifier or wet
pipe outlet. The ventilation must always function.
If it stops operating, a red warning lamp comes on.
4. TECHNICAL DATA FOR DEHUMIDIFIER CTR 500TT
Dry air volume 500 m3/h
Wet air volume 60-80 m3/h
Height x width x length 360 x 385 x 325 mm
Weight 21 kg
Power output 1780 W
“Actual power” approx. 1500 W
Power supply 220V/50 Hz
Wet air outlet Ø76 mm
Process air inlet 2 x Ø125 mm
Dry air outlet 2 x Ø100 + 3 x Ø 50 mm
Overheat protection setting 80°C
Overheat protection (safety thermostat 1), setting 80°C
Overheat protection (safety thermostat 2), setting 130°C
Drying capacity at: 20°C, 60% RH 32l/24 hrs
10°C, 60% RH 22l/24 hrs
5°C, 60% RH 19l /24 hrs
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5. INSTALLATION
CTR 500 TT is a complete machine, ready for connection. All components required for operation are integrated and internally connected.
The local regulations for electrical installations must be followed.
Planning and design of a dehumidifying system covers:
- the dehumidifier’s position and connections
- the shape of the duct system
- distribution of the correct air volumes
- the hygrostat’s position and connection. This is described more in the next section.
a) Location of CTR 500TT
The dehumidifier must be placed in the crawl space so that the following requirements and
demands are satisfied:
- effective distribution of the dry air with as simple a dry air duct system as possible
- simple duct routing for supply of dry air and removal of wet air
- simple electrical connection
- space and access for easy filter changes
The dehumidifier is installed in the area to be dehumidified. It is ideally positioned near a wall
on a bracket or shelf so that the filter is easy to access for replacement.
b) Duct system
Inward process air can be ducted or work with free suction. Dry air should be ducted. Wet air
must be ducted so that the moisture laden wet air is vented outside the dehumidified area.
Always use Corroventa´s installation kit to achieve best function.
Wet air
In certain cases, condensation can occur in the wet air hose. To avoid this, the hose must be laid
with a fall from the machine. If a fall cannot be achieved directly from the machine one should
make a drainage hole in the lowest part of the hose, to prevent water running back into the
dehumidifier. To further prevent condensation, the insulated sound damping hose provided in
the “installation kit” must be used.
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To bear in mind
The wet air hose must not be replaced with one with smaller dimensions. If
this occurs, the installation's function is affected and the dehumidifier can overheat.
c) Connection of control panel, (hygrostat section)
The hygrostat is placed in the crawl space where the conditions are
considered suitable or particularly critical. It must not be located in
a position where it is exposed to the dry air. It must not be located
near sources of heat or cold or exposed to solar radiation. The mois-
ture sensor must be removed from its transport cover and hang
freely from its cable.
d) Connection of control panel (indicator box)
The indicator box must be placed in a suitable location in the house
where it can be easily monitored. To avoid unnecessary electrical
routing it should be as close to the dehumidifier/hygrostat as possible.
6. OPERATION AND CARE
a) Start
The machine should be checked immediately after receiving it.
Faults and transport damaged parts must be reported immediately.
1. Check that the filter is clean
2. Check that there are no blockages in the connected duct system
3. Connect the dehumidifier to an earthed electrical socket 230V. An earth fault breaker
should be used.
4. Does the rotor rotate? Look through the dry air opening.
5. Check the temperature of the wet air, which is significantly hotter than process air
during dehumidifying.
6. Follow the dehumidifier's function. Note in the service journal.
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Moisture
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b) Maintenance, service
The filter must be checked and replaced regularly, at
least once a year. If the air filter is extremely dirty it
must be replaced more often.
Open the filter door and replace the filter with a new
one.
c) Overheating
If the filter is very dirty or if the fan is broken, the
dehumidifier will stop because of overheating, which
causes the red warning lamp “operational stop” on
the control panel to light.
Allow the machine to cool and pull the electrical
plug out of the socket. If the machine has stopped because of a dirty filter it will run again
after replacing the filter, once the plug is connected to the socket.
If the dehumidifier does not restart or stops again because the fan is broken, contact the
installer.
d) Operation and service journal
Make notes of the filter changes in the table below. The operating hours reading is noted. Note
any action taken in conjunction with the filter change or other inspection in the column
"Notes".
Date Run time meter
hours
Filter
replacement
Yes / No
Notes
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7. INSTALLING CONTROL PANEL
CONTROL PANEL CONSISTS OF:
- indicator box located in main entrance, cloakroom or similar.
- hygrostat section with connection box is placed in the crawl space.
INSTALLATION ORDER:
NOTE! Ensure that the dehumidifier is unpowered!
1. Remove the cover of the indicator box.
2. Disconnect the cable with 6 connections and carefully pull them out of the indicator
box.
3. Drill a hole between the crawl space and the upper floor.
4. Screw the hygrostat connector into the dehumidifier.
5. Install the hygrostat section with connection box.
6. Route the (according to point 2 above) disconnected cable up through the drilled hole to
the upper floor.
7. Screw the indicator box into place at a suitable location using the screws provided (4 x).
8. Reinstall the previously disconnected cable (according to point 2 with 6 connections).
The connectors' cable colours are installed on the corresponding colour markings on the
terminal block.
9. On the first page of the Technical description write down which office has installed it
with contact person and a telephone number the customer can call if anything happens
to the installation.
NOTE! Hygrostat section with connection box must not be opened!
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Technology and products for remediation of radon, moisture and odours
CORROVENTA AVFUKTNING AB | Mekanikervägen 3 | SE-564 35 Bankeryd
Tel +46 (0)36-37 12 00 |
[email protected] | www.corroventa.se
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