MICROWELL DRY 300 DUCT Operating manual

DUCTED SWIMMING POOL
DEHUMIDIFIER
User´s and installation manual
Version: 2023-06-07
Model: DRY300DUCT
DRY400DUCT
DRY500DUCT
DRY800DUCT
DRY1200DUCT

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CONTENT
Thank you for purchasing Microwell swimming pool dehumidifier. You have
exceptional piece of device and you chose the best and the most energy
efficient dehumidifier for your pool. Before you use this device, it is
necessary to carefully read the entire User’s manual. Please keep the User’s
manual available in the case of any future reference is required. Please
provide this information also to each user of the device. Please mind local
regulations in your country regarding installation and usage of this
dehumidifier which are valid in addition to this User’s manual.
1. WASTE DISPOSAL INFORMATION ................................................................................................................ 3
2. SAFETY MEASURES ...................................................................................................................................... 3
2.1 ELECTRICAL SAFETY ...................................................................................................................................... 4
2.2 USAGE PRECAUTIONS................................................................................................................................... 4
2.3 HANDLING PRECAUTIONS ............................................................................................................................ 5
3. PRODUCT DESCRIPTION............................................................................................................................... 7
3.1. DESCRIPTION OF BASIC PARTS...................................................................................................................... 10
3.2. AIR CONNECTION OPTIONS ......................................................................................................................... 11
3.3. LPHW HOT WATER INSERT FOR ADDITIONAL HEATING –ON DEMAND ................................................................. 16
3.4. HUMIDITY CONTROL BY REMOTE CONTROLLER –ON DEMAND............................................................................ 18
3.5. HUMIDITY CONTROL BY EXTERNAL WIRED HUMIDISTAT EBERLE ........................................................................ 20
4. HANDLING INSTRUCTIONS......................................................................................................................... 21
4.1 MAIN HUMIDISTAT........................................................................................................................................... 21
4.2 CONTROL OF THE FAN ....................................................................................................................................... 26
4.3 COMPRESSOR CONTROL .................................................................................................................................... 26
4.4 MAINTENANCE................................................................................................................................................ 27
5. INSTALLATION GUIDE ................................................................................................................................ 27
5.1 LOCATION OF THE EQUIPMENT............................................................................................................................ 27
5.2 DEVICE FIXATION.............................................................................................................................................. 27
5.3 COMPRESSOR TRANSPORT PROTECTION................................................................................................................ 37
5.4 CONDENSED WATER DRAINAGE........................................................................................................................... 37
5.5 MAIN POWER SUPPLY CONNECTION..................................................................................................................... 39
5.6 CONNECTION TO AIR DUCTING..................................................................................................................... 43
5.7 LPHW HEATING COIL FOR ADDITIONAL HEATING –ON DEMAND ........................................................................ 46
5.8 HOT GAS DEFROST (DRY300/ DRY400/ DRY500DUCT) –ON DEMAND.......................................................... 47
5.9 EXTERNAL INSTALLATION............................................................................................................................ 47
5.10 AIR FILTER –ON DEMAND........................................................................................................................... 49
5.11 AIR FILTER REPLACEMENT ........................................................................................................................... 50
5.12 COVER REMOVAL...................................................................................................................................... 50
5.13 EXPANDED VIEW OF MODEL DRY DUCT....................................................................................................... 52
6. TECHNICAL DATA....................................................................................................................................... 53
6.1 TECHNICAL DATA TABLE *.................................................................................................................................. 53

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6.2 VENTILATOR &EXTRACTION RATE DIAGRAMS ....................................................................................................... 54
6.3 UNIT´S DIMENSIONS ........................................................................................................................................ 57
6.4 WIRING DIAGRAMS.......................................................................................................................................... 59
7. SUMMER SHUT-DOWN.............................................................................................................................. 65
8. WARRANTY ................................................................................................................................................ 65
1. WASTE DISPOSAL INFORMATION
When using this dehumidifier in the European countries, the following information must be
followed:
DISPOSAL: Do not dispose this product as unsorted municipal waste. It is prohibited to
dispose this dehumidifier in domestic / household waste. It is prohibited to dispose this
appliance into forests or natural landscape. This could lead into local soil pollution. Collection
of such waste must be treated individually.
DISPOSAL POSSIBILITIES:
1. The municipality has established a collection system where electronic waste can be
disposed.
2. When buying a new product, the retailer or the manufacturer may take back the old
appliance free of charge.
3. As old appliance may contain valuable resources which could be sold to scrap material
dealers.
4. Disposal of packaging materials such as carton box or plastic / bubble foil can be recycled.
Please use your local waste separation services.
2. SAFETY MEASURES
This device is primarily designed for use in indoor swimming pool, sauna or spa. Alternative use is in
laundries, drying rooms or other humid areas requiring dehumidification.
Model Microwell DRY 300 DUCT is designed for halls with swimming pool surface of up to 30m2.
Model Microwell DRY 400 DUCT is designed for halls with swimming pool surface of up to 40m2.
Model Microwell DRY 500 DUCT is designed for halls with swimming pool surface of up to 50m2. Model
Microwell DRY 800 DUCT is designed for halls with swimming pool surface of up to 80m2.
Model Microwell DRY 1200 DUCT is designed for halls with swimming pool surface of up to 110m2.
It is necessary to follow instructions in this User’s manual and local regulations in your country that
regulate the installation and usage of this device. Incorrect, improper or operations contradictory to
For proper and optimal operations of the device is it necessary to maintain the air
temperature in the swimming pool room / hall 2-3°C higher than actual water temperature
in the pool. It is also necessary to keep the air temperature in the swimming pool room / hall
in operational temperature range of the dehumidifier (specified in Technical data section)
based on particular choice of Operational Temperature Accessories chosen for your particular
device. Lower air temperature than operational temperature range may cause damage to the
unit resulting from freezing. Higher temperatures than operational temperature range may
cause damage to the unit resulting from overheating of the unit.

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this User’s manual may lead to an injury or property damage and will lead to loss of warranty. To
prevent injury or property damage the following instructions must be followed:
2.1 ELECTRICAL SAFETY
•The device operates at dangerous electrical current.
•Only authorized person with particular electro-technical qualification can manipulate with unit.
•Danger of electrical shock.
•Do not exceed the required power supply.
•Do not turn the device on that shows signs of possible damage such as broken packaging, broken or otherwise
damaged unit’s chassis or cover, smoke, smell, etc.
•It is necessary to use appropriate Residual current circuit breaker (RCD) for connection of the dehumidifier to
main power supply.
•Do not manipulate with the device with wet hands.
•Do not clean the device with water.
•Before cleaning the device, switch off the circuit breaker of the unit’s power supply.
•Installation, service or repair must be performed by qualified technician.
•When the device is not intended to be used for a longer time, we recommend switching the circuit breaker of
the unit’s power supply off.
•Unit must be installed in vertical position to avoid condensate water to enter electrical part of the unit.
•It is forbidden to install the unit close to devices that may cause electrical or frequency disturbance such as
welding machines, motors or rotors, WIFI/WLAN routers or repeaters.
•It is forbidden to alter electrical installation of the device. It is also forbidden to alter any other part or
functionality of the device.
2.2 USAGE PRECAUTIONS
•Air outlet (exhaust) and air inlet (intake) are designed for connection to air ducting system.
•Do not cover or block the intake or exhaust openings. It is forbidden to block or cover the intake or exhaust
openings with clothes, towels, buckets, canoes, ceiling beams, etc.
•Do not install or place any heating appliances close to intake grilles / louvers. It could continually overheat
the dehumidifier and result in its malfunction or damage.
•Do not climb up on or sit on the unit.
•Do not place any objects on the top of the unit (e.g. boxes, flower vases, etc.).
•Do not spray any flammable substances into the equipment; this might lead to fire.
•Do not clean the equipment with aggressive cleaning agents, this might lead to damage or deformations.
•When cleaning plastic parts do not use any cleaning agents unsuitable for the cover of the dehumidifier
(household cleaning agents, solvents, bleaching agents, benzene, diluents, rough cleaning powder, cresol,
chemical agents). Instead, sweep the dehumidifier cover with a soft cloth or a sponge.
•Never throw or insert any objects into any hose or opening.
•The cover is made from powder coated metal. Do not manipulate with lighted cigarette, cigarette ashes, or
any other kind of fire in vicinity to this part.
•Use this device exclusively for the intended purpose, as described in the attached instruction manual. Do not
use parts which are not recommended.
•Do not drink or use the condensate water drained from the unit. Do not return the water back to the swimming
pool. The water may be contaminated with bacteria.
•Children are not allowed to operate, touch or play with the unit.
•Children are not allowed to manipulate with packaging, plastic / bubble foil. Risk of suffocation!
•Prevent the children from injury or harm caused by any manipulation with the unit, its parts or its
packaging. Small parts like screws may be swallowed and cause suffocation or harm to health.
•Do not leave the children in the swimming pool hall unattended.

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2.3 HANDLING PRECAUTIONS
•Transport in a horizontal position or overturning the unit may damage the compressor, which may result in
malfunction or damage to the unit and will void the warranty.
•The device must be handled carefully and with special care to avoid mechanical damage.
•It is forbidden to exert any unsuitable mechanical force on the unit, which may cause mechanical damage to
the device
•It is forbidden to freely drop the device on the ground or any hard or rough surface that can lead to a hard
impact of the device and scratch the cover. As the owner of the area make sure that your installer does not
damage the cover or a part of the device during handling and installation.
Keep in vertical
position for 2 hours
Leave the unit in a vertical upright position for at least
2 hours before mounting. It is necessary to stabilize the
refrigerant charge and especially to return the oil to
the compressor tray. Oil could get out of the tray
during transport and handling, and this could adversely
affect the function of the dehumidifier.
Beware of scratches. Handle the
device carefully. Avoid contact with
surfaces that may scratch the device.

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•Please notify your reseller or distributor if the delivered unit had been damaged. The unit may appear to work
fine at first, but minor damage may cause the unit to stop working properly in a short time. In this case the unit
must be inspected and its further use must be approved by the seller.
•Please notify your reseller or distributor if you notice immediately after installation that the unit is not working
properly.
•In case of device failure resulting from improper handling or mechanical damage (impact, hit, fall, etc.), the
manufacturer reserves the right to evaluate the continuity of warranty.

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3. PRODUCT DESCRIPTION
The unit was delivered in carton box on a wooden palette. Please unpack the unit and check the
content. It should include the following:
Package:
Name/ code
Image
Name/ code
Image
1 –Dehumidifier
1x
DRY300/400 DUCT
DRY500 DUCT
DRY800/1200 DUCT
2 –Metal feet /
adjustable screw with
plastic heel /
4x
Compatibility:
DRY800/1200 DUCT
3 –Condensate
drain hose
(illustration photo)
1x
4 - Installation and
user manual
1x

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5 –Adjusting "L"
piece
2x
+ screw M6 –2x
+ nut MC –1x
+ washer D7 –2x
Compatibility:
DRY800/1200 DUCT
6- Built-in digital
humidistat and
thermostat
Additional accessories (to order):
Name/code
Image
Name/ code
Image
1 - External wireless
humidistat and thermostat
DRY EASY 300
1x
Part of packaging (white
box) located on the fan
plate on the left
In this case the “Built-in
digital humidistat and
thermostat“ is not
installed.
2 - External wired humidistat
EBERLE
/picture may differ/
Separate small box glued to
the device (cardboard box)
see picture 1
In this case the “Built-in digital
humidistat and thermostat“ is
not installed.
3A –Wall console
1x
Compatibility:
DRY300/400/500 DUCT
3B –Wall console
2x
Compatibility: DRY800/1200
DUCT
4 –Fixing screws for
a cross screwdriver D6
and dowels D10
(illustration photo)
4x
5 - Solenoid valve - valve and
coil
1x
Part of packaging (white box)
located under the main cover
on the fan plate on the left,
see. picture point. 1
Easy300 / Eberle
Solenoid valve

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6 –Air filter
Installed inside the device
7 –Defrost thermostat
Please note that pictures may differ.
List of necessary tools (is not part of packaging):
Názov/ kód
Obrázok
Názov/ kód
Obrázok
1 - Drill
1x
3 –Drill bit 10mm
1x
2 - Phillips
screwdriver
1x
Vacuum cleaner and
ladder
5 –Small hammer
1x
6 - Meter
1x
7- Spirit level
1x

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1.1. Description of basic parts
DRY300/400 DUCT
DRY500 DUCT
DRY800/1200 DUCT
1
2
3
0
5
4
6
Legend:
1 –Air exhaust / AIR OUT/ = supply for pool hall
2–Air suction /AIR IN/ = exhaust from pool hall
3–Mechanical humidistat (on the bottom)
4–Metal cover
5–LPHW connection B-BACK or R-RIGHT
6–Condensate drain Ø 16 mm (from the back)
7 –Main power supply connection box 230V (under the
main cover)
8 –Built in digital controller
9 –Compressor (under the cover)
10 –Fan(s) / Ventilator (s)
3
0
1
1
2
2
4
4
5
5
7
7
8
0
8
0
Please note that your dehumidifier may
differ from here pictured units.
9
9
10
0
10
0
10
3
0
7
8
0
9

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1.2.Air connection options
1.2.1. DRY300/400 DUCT
Connection marking
Connection type
Hatch
dimensions
Flange
connection for
air ducting
Thread
S1
Air inlet from bottom
300x100mm
320x120mm
M6
S2
Air outlet from the top
300x100mm
320x120mm
M6
F1
Air inlet from the front
300x100mm
325x125mm
M6
F2
Air outlet from the front
388x87mm
413x112mm
M6
DRY300DUCT, DRY400DUCT
AIR OUTLET TO THE TOP S2
AIR OUTLET TO THE FRONT F2
AIR INLET FROM THE BOTTOM
S1
AIR INLET FROM THE FRONT
F1
S2
S1
S1
S2
S2
F1
F2

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1.2.2. DRY500 DUCT
Connection marking
Connection type
Hatch
dimensions
Flange
connection for
air ducting
Thread
S1
Air inlet from bottom
500x100mm
520x120mm
M6
S2
Air outlet from the top
500x100mm
520x120mm
M6
F1
Air inlet from the front
500x100mm
510x120mm
M6
F2
Flange connection for air
ducting
500x96mm
520x76mm
M6
S2
F2
F1
S2
F1
S1

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DRY500 DUCT
AIR OUTLET TO THE TOP S2
AIR OUTLET TO THE FRONT F2
AIR INLET FROM THE BOTTOM
S1
AIR INLET FROM THE FRONT
F1

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1.2.3. DRY800/1200 DUCT
Connection marking
Connection type
Opening
dimensions
Flange
connection for
air ductiong
Thread
A1
Air inlet from the back
700x100mm
720x120mm
M6
A2
Air outlet from the back
700x100mm
720x120mm
M6
B1
Air inlet from the front
700x100mm
725x125mm
M6
B2
Air outlet from the front
700x100mm
725x95mm
M6
C1
Air inlet from the bottom
700x100mm
720x120mm
M6
C2
Air outlet from the top
700x100mm
720x120mm
M6
A1
A2
B1
B2
C1
C2

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DRY800 DUCT, DRY1200 DUCT
AIR OUTLET TO THE BACK A2
AIR OUTLET TO THE TOP C2
AIR OUTLET TO THE FRONT B2
AIR INLET
FROM THE
BACK
A1
AIR INLET
FROM THE
FRONT
B1
AIR INLET
FROM THE
BOTTOM
C1
Humid air is brought into the
dehumidifier. It leaves the dehumidifier
dried and warmer by 5-20° than inlet air
depending on air temperature,
humidity and LPHW performance.
RECOMMENDATION: Cover your pool when not used. It will reduce the amount of
vapor in the air and energy costs needed to operate your dehumidifier.
Humid air
Dry air

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1.3. LPHW hot water insert for additional heating –on demand
The LPHW heating element is only available on request. The connection of the LPHW hot water insert
is made similarly to the connection of the radiator. A control valve is connected at the inlet and a shut-
off valve with a screw connection at the return. These are supplied by the heating supplier.
If your dehumidifier is equipped with a hot water element and/or a solenoid valve, you must use built-
in digital controller OR MICROWELL DRY EASY300 wireless humidistat and thermostat OR EBERLE
HYG7001 thermostat and hygrostat to activate the air heating function with a dehumidifier, or you
must have an external thermostat connected. The reason is that the built-in mechanical humidistat or
cable remote humidistat EBERLE HYG6001 does not have a thermostat function. An external thermostat
is not included in the package of this product.
If your dehumidifier is equipped with a hot water element and your dehumidifier is designed without a
thermostat, there is a risk of the dehumidifier overheating. Overheating can occur if hot water flows
into the LPHW ( hot water insert even when the dehumidifier dehumidification is not running - fan off).
Under normal circumstances, a thermostat and an original solenoid valve regulate the water supply
automatically, effectively preventing the dehumidifier from overheating. It is therefore necessary to use
a thermostat to control the heating in the appliance. Neither the manufacturer nor the distributor is
liable for damages resulting from non-compliance with the above instructions.
Please note that DRY 300/400/500 are not equipped with a thermostat and a
potential-free heating contact by standard.
LPHW connection scheme
The boiler, circulation pump, valves
and connecting pipes and other
elements are not part of the
dehumidifier package.
Image: Solenoid valve with coil -
used in LPHW with regulation; Water
circuit connection ½“ inner
Recommendation: Install valves in
front of the dehumidifier to
disconnect the hot water insert from
the appliance; Water circuit
connection ½“ inner
Hot air
Safety valve
Solenoid valve
Circulation pump
Boiler
Cool air
Fan
Dehumidifier
Hot water insert

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Parameters of the solenoid valve:
•dimension DN 12,
•operating pressure PN 10,
•threaded connection,
•control: coil
•230V (D-233),
•material: brass,
•controlled directly,
•type: 8253 12D 1 12 2 1 230V AC
No.
Item
Material
1
Safety nut
Galvanized steel
2
Washer
Galvanized steel
3
Coil
PBT + 30% G.F
4
Piping
Stainless steel AISI 430
5
Seal
FPM
6
Screw
Stainless steel
7
Cover
Brass CW 617 N
8
Spring
Steel
9
Ring
Stainless steel
10
Piston
Stainless steel
11
Spring
Steel
12
Support
Stainless steel
13
Insulation
NBR
14
Spring
Steel
15
Cover
Stainless steel
16
Membrane
NBR
17
Cover
Stainless steel
18
Body
Brass CW 617 N
Circulation pump
Potential-free contact
*The pictures are illustrative.
Potential-free contact
Voltage-free contact

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LPHW connection options
FROM THE BACK
FROM RIGHT
1.4. Humidity control by remote controller –on demand
An external wireless humidistat and the DRY EASY 300 thermostat can be ordered for the pool
dehumidifier which is equipped with a built-in mechanical humidistat as standard.
Wireless communication takes place in the 868 MHz band, where the emphasis is on the reliability and
range of the controller. The dehumidifier is controlled primarily by a remote humidistat, provided that
the built-in humidity controller in the dehumidifier is set to a higher desired humidity value than the
remote humidistat.
The dehumidifier can be equipped with a solenoid valve on request. When used in
combination with a hot water coil, it has a similar function to the fan coil, i. the fan
works independently with the compressor (humidistat) and independently with the
LPHW hot water coil (thermostat).
It is recommended to insert a shut-off valve between the LPHW hot water insert and the
heating source. This will allow it to be quickly disconnected from the heating system in the
event of a fault in the heating system and/or maintenance of the system or dehumidifier.
External wireless humidistat and thermostat DRY EASY 300
When ordering the DRY EASY 300, there will be no digital humidistat and thermostat 1401F
on the cover. The hole in the cover will be covered.
1. TRANSMITTER 2. RECEIVER 3. ANTENNA

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If the backup humidistat had been set to a lower value than the DRY EASY 300 remote humidistat, the
backup humidistat will take over the room humidity control and in this case the dehumidifier will not
respond to signals from the DRY EASY 300 remote humidistat.
Broadcast indication
The manufacturer recommends setting the required humidity value on the DRY EASY 300 in the
range of 55 to 65% RH.
Additional functions and operation of the remote humidistat are described in
the separate enclosed instructions.
Battery status
indicator
Humidity
Tempera
ture
Dehumidification
indicator
Indication of reaching/not
reaching required humidity
Indication of reaching/not
reaching required
temperature
Heating indicator

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Location of receiver and antenna
A: The receiver is located inside the electrobox and the antenna is located on the outside of it.
B: For TTW version / through the wall / we recommend pulling the antenna into
the pipe in the wall. Follow the picture below.
DRY300/400 DUCT DRY500 DUCT DRY800/1200 DUCT
DRY800/1200 DUCT
1.5. Humidity control by external wired humidistat EBERLE
If your device is equipped with an EBERLE wired remote humidity controller, pay attention to this
section of the installation manual.
The dehumidifier can be equipped with a remote humidistat on request. In this case, the dehumidifier
has two humidity controllers. One of them is a built-in mechanical humidistat inside the pool
dehumidifier, the other is an external wired humidistat. The dehumidifier is controlled primarily by the
remote humidistat, provided that the built-in humidity controller inside the dehumidifier is set to a
higher desired humidity value than the remote humidistat.
Wired humidistat EBERLE HYG6001
Wired humidistat and thermostat EBERLE
HYG7001
When ordering EBERLE HYG6001/7001, there will be no digital humidistat and thermostat
1401F on the covers and the hole in the cover will be covered with a cover.