PureAiro WMDH 25 User manual

Installation & Operations Manual
PUREAIRO
WMDH 25
Key features:
Operates quietly
S imple to install
I s independent of the
HVAC SYSTEM
I t is powerful and compact
C ontrols are protected by
tamper proof cover
E asy to operate
PureAiro solutions inc.
Add: Berlin, Germany.
Tel: [phone]
E-mail: [email protected]

TABLE OF
CONTENTS
01
The in-wall WMDH 25 dehumidifier includes: WMDH 25 dehumidifier, 1 in-
wall front cover, 1 WMDH 25 washable air filter, 1 drain hose and clamp, 1
power cord, 1 front cover tool, 1 set of tamper resistant screws and 1
Operations Manual.
WMDH 25 operates at sound levels lower than 46 dBA, effectively removing
excessive moisture without sacrificing comfort or ambiance. This in-wall
mounted dehumidifier is suited for both new construction and retrofit
installations in multifamily, commercial, educational and industrial
applications.
WMDH by PureAiro is a self-contained, energy efficient dehumidifier that
can be installed permanently to interior walls, including masonry or CMU
block. Designed to fit between 400 mm wall studs, a single unit controls
relative humidity for spaces to 140 square meter and drains directly into a
hub drain or plumbing line — eliminating the need for reservoir tanks. The
WMDH 25 dehumidification system can be connected to a standard 220V
outlet or can be hard-wired.
PRODUCT INTRODUCE
Safety Notes
Electrical Supply
Principle of Operation
Installation
Operating Instructions
Diagram
Maintenance
Troubleshooting
Warranty
02
02
03
03
04
05
06
08
09
00
PureAiro WMDH 25

PRINCIPLE OF OPERATION
ELECTRICAL SUPPLY
The WMDH 25 Dehumidifier utilizes its integral humidistat to monitor the conditioned space.
When the relative humidity goes above the selected set point, the dehumidifier will
energize. Air is drawn across an evaporator coil, which is cooler than the dew point of air.
This means moisture will condense out of the air. The air is then reheated through the
condenser coil and distributed back into the room.
POWER SUPPLY
OUTLET REQUIREMENT
CIRCUIT PROTECTOR
220 Volts AC may cause serious injury from electric shock.
WARNING
TO ENSURE SAFETY:
Disconnect electrical power before servicing.
Only plug unit into grounded electrical circuit.
Do not use extension cord.
Do not use a plug adapter.
SAFETY NOTES
The WMDH 25 Dehumidifier must always be connected using a grounded electrical
connection (as required for all electrical appliances). If non-grounded wiring is used, all
liability reverts to owner and the warranty is voided.
The WMDH 25 Dehumidifier should only be installed and serviced by a qualified
technician.If there is a chance that water flooded the dehumidifier, it should be opened and
allowed to dry thoroughly before reconnecting to electrical power and restarting.
To ensure proper operation, no obstruction should be located within 915 mm of the
discharge of the unit.
Do not insert any objects or fingers into the inlet or discharge. If service is required, call a
qualified technician.
All work on the dehumidifier should be done with the unit“off” and unplugged or the breaker
turned off.
Do not use water to clean the exterior. To clean unit, unplug from power, then use a damp
cloth to wipe exterior.
Drain hose must be installed to ensure proper gravity flow of condensate water to a drain
source.
PureAiro WMDH 25
220 V, 50 Hz AC, Single Phase
3-Prong
15 Amp Time Delay Fuse or Circuit Breaker
02 03
INSTALLATION
Do not install your dehumidifier in a corrosive environment.
WARNING
Mounting
The WMDH 25 Dehumidifier is designed to mount into the wall cavity between two studs
mounted on standard 406mm centers. The chassis of the unit slips into the wall from the
front and is secured by the four mounting tabs with screws (not provided).Ensure the
bottom of the unit is properly supported before screwing into drywall.
1
2
3
4
CONTROL BOARD
SET ON/OFF
Humidity Setpoint
Button
On/Off Button
Humidity Display
Plumbing
The 300 mm drain line (included) is to be attached to the barbed drain hose connection on
the rear of the unit. Secure hose with a hose clamp (included). The entire length of drain line
to the gravity drain must be downhill. No low spots or dip are permitted as they may cause
leaks. It is possible to use a short piece of the included tube to deposit condensate directly
into a PVC gravity drain system. All state and local plumbing codes must be adhered to
for proper operation of the unit and to maintain warranty compliance.

Electrical
A 300 mm power cord is provided for use with a standard grounded outlet. It is also possible
to hard wire the unit, if necessary. Simply remove the electrical cover plate from the back of
the unit, remove the cord, and connect the hard wiring. All state and national electrical
codes must be adhered to for proper unit operation and warranty compliance.
Optional Condensate Pump:
If desired, condensate from the unit can be drained into a remote condensate pump
(provided in end use). If the condensate pump has a normally open safety switch, the safety
switch can be connected to the dehumidifier. This will allow the safety switch to shut off the
dehumidifier if it detects a problem. The wiring connections for the remote condensate pump
are located on the left hand side of the electrical compartment on the back of the
dehumidifier. Connect the red and black wires on the dehumidifier to the Normally Open
Pump Safety switch.
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2
04 05
PureAiro WMDH 25
Optional NO contacts for
safety switch on
condensate pump (NIC)
Hose Clamp to
fasten Hose
INSTRUCTIONS FOR USE
ON/OFF Control
Plug the unit in and the display will show the current room relative humidity. Press the on /
off button, and the machine will beep twice indicating it is ready for automatic service. If the
humidity is below set point, it will remain in standby condition. If the humidity is above set
point, the unit will turn on and begin to remove moisture from the room. Press the on/off
button again, and a single beep will indicate that the unit is turning off. No room conditioning
will occur until the unit is turned on again.
Setting the Humidity Level
Press the button to set the indoor humidity. The humidity display will shift from displaying
the actual room humidity level to the current set point. The humidity can be in 5%
increments from 30%-90%. Pressing the button increases set point by 5% until you reach
90%, then rolls over to 30% and increases from there.
WMDH25 DEHUMIDIFIER
Air Discharge
Air Inlet
Front Cover
Front Cover
Screws & Caps
Chassis
Chassis
Power Cable
Type 4
Mounting
Flanges
Drainpipe
Connection
Electrical
Plate cover
FRONT VIEW
BACK VIEW

06 07
PureAiro WMDH 25
MAINTENANCE
220 Volts AC may cause serious injury from electric shock. Be sure the
unit is powered off and unplugged or circuit breaker is turned off before
removing front cover to service unit.
WARNING
Cleaning Front Cover
Filter Maintenance
Use a soft damp cloth to clean the front cover as required. Do not use any soap or solvents.
Check the filter on a regular basis (will vary based on application). Clean or replace, as
necessary.
NOTE: Machine is intended to
opcrate with all components
shown.Do not remove any parts
including Styrofoam fan shroud.
To Remove Filter
Remove screws in the front cover.
Push the front cover up gently to free the cover hooks from the chassis.
The filter is located on the back side of the front cover.
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2
3
To Clean Filter
Filter can be vacuumed with a wet/dry vac or washed with warm water.
To Install Filter
Insert filter in tabs on top of mount
Flex filter to insert under bottom taps
Once filter is in place, re-install front cover:
a. Line up cover with tabs
b. Slide down into place
c. Secure with tamper proof screws
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2
3
Coil Maintenance
Once per year, clean the coils with an approved coil cleaner
Coil cleaner should be a self rinsing, foaming cleaner such as WEBR Coil Cleaner.

08 09
PureAiro WMDH 25
TROUBLESHOOTING
SYMPTOM CAUSE SOLUTION
that the plug is properly installed
in outlet.
Power Supply
Machine Won'
Run
Clean the after mesh according to
Instructions listed in manual.
Air Filter is Clogged
Water is
Leaking Clear the blockage from inlet or outlet.
Loud Noise
E1
Warning Light
E2
Warning Light
Room Temperature Over 35℃ or
Below 10℃
The unit is outside the operating
temperature range. Modify the room
conditions so the temperature is between
10-35℃and operation will commence.
Air Inlet or Outlet is Jammed
Machine Is Not Level
Filter Mesh is Jammed
Unit not installed with 4 screws or
poor quality screws
Machine not supported by blocking
Machine is touching or rubbing an
unrelated item
Low spots, dips, or kinks are present
inside or outside machine.
Sensor or Sensor
Communication Issue
Remote Alarm
Sensor believes temperature is
below 10℃
Sensor believes temperature is
above 35℃
LOW
Warning Light
HIGH
Warning Light
Water is
Leaking
Reposition unit so it is level
Clean the filter mesh according to
instructions listed in manual.
Unit MUST be installed with 4 screws
provided.
Blocking is required
solate items to eliminate noise/vibration
Check sensor cable connection is secure
at both ends
If room temperature is low., raise the
temperature and unit will function normally.
If not, replace the sensor.
If room temperature is high, lower the
properly. If not, replace the sensor.
Ensure end of drain hose Is not submerged
in water from property's drain source.
Re-route tubing to eliminate all low spots,
kinks, valleys, and dips
Replace Sensor
Alarm is designed to indicate that the
remote condensate pump has an issue.
If pump is installed, clean or replace
as necessary.
If no pump is installed,ensure the safety
wires are not connected to each other.
WARRANTY
Pureairo warrants the equipment to be free from defects in workman-ship and materials for
a period of 24 months after shipment. This warranty is limited, however, to the re-pair or
replacement of defective equipment. If it is necessary to return unit for service, customer is
solely responsible for proper packaging, transportation costs. Customer must initiate
warranty process by contacting Pureairo. Do not send any component or product back to
Pureairo without Return Material Authorization.
This limited warranty does not apply to any part or component that is damaged in transit or
when handling, has been subject to misuse, corrosion, chemicals, acts of God, has not
been installed, operated or serviced according to the Seller's instructions, or has been
operated beyond the factory-rated capacity or has been altered in any way. Routine
maintenance is not covered by this warranty.
Seller's liability is limited to replacement of defective parts or components and does not
include any cost of labor (including, but not limited to, labor to remove and/or re-install any
defective part), refrigerant or piping. Customer may elect to have unit fixed locally in which
case required replacement parts will be sent to customer at customer's expense.
Pureairo shall not be responsible for loss of use of any product, loss of time, inconvenience,
or damage to other equipment, or any other indirect or consequential damage with respect
to property whether as a result of breach of warranty, neglect, or otherwise.
THE WARRANTIES AND LIABILITIES SET FORTH ARE IN LIEU OF ALL OTHER
WARRANTIES EX-PRESSED OR IMPLIED, IN L AW OR IN FACT, INCL UDING IMPLIED
WARRANTIES OF MERCHANT-ABILITY AND FITNESS FOR PARTICUL AR PURPOSE.
Pureairo total liability, regardless of nature of claim shall not exceed original purchase price
of the product. If a product or component is replaced while under warranty, the applicable
warranty period shall not be extended beyond the original warranty time period.
The foregoing shall constitute the total liability of seller in the case of defective performance
of all or any of the equipment or services provided to Buyer. Buyer agrees to accept and
hereby accepts the foregoing as the sole and exclusive remedy for any breach or alleged
breach of warranty by Seller.