Installation - VEAB CWDX Manual

CWDX
GB
Design.
Casing made of Zinc Magnesium-coated sheet steel.
Coil with copper pipes and pipe connections as well as
aluminium fins with hydrophilic coating with 4 mm fin
spacing that minimises maintenance, even in dusty environ-
ments. Stainless steel drip tray with condensation drain.
Opening access panel for easy inspection and cleaning.
Duct connections are fitted with rubber gaskets.
Use.
The CWDX is used in round ventilation ducts as an
indoor unit for centralised cooling of the ventilation air in a
ventilation system. CWDX duct coolers can also be used
in combination with a heat pump with controller that
switches between heating and cooling.

Installation.

The CWDX is suitable for push-in assembly in standard
spiral/ventilation ducts. Air direction as per installed
arrow. Use screws to secure the unit to the duct sys-
tem. It can be installed in either upstream or downstream
from the fan unit in horizontal ducts. When installing
downstream from the fan, ensure the air flow over the
coil is uniform. We recommend that the distance to or
from duct bends, fans, dampers or such is at least twice
the duct diameter. To achieve maximum cooling output
and ensure safer operation, the unit should not be instal-
led directly after a fan outlet or duct bend. When instal-
ling upstream of the fan, ensure the fan motor and other
components re suitable for the humid air downstream
of the cooler. Max. air velocity for cooling operation is
2.5 m/s.
We recommend using an effective filter in the system.
For cooling operation, the CWDX and ducts trans-
porting the cooled air must be insulated externally to
prevent the formation of condensation on the outside.
Ensure that expansion forces in the system or the piping
system's dead weight do not strain the CWDX's connections.
Fill the pipes with nitrogen when soldering to prevent
oxidation.
Protect pipe seals against high heat when soldering.
We recommend using an expansion valve with external
pressure equalizing to achieve optimal evaporation and
minimize the risk of unevaporated coolant ending up in
the compressor.
Drain.
The CWDX must be connected to a drain to drain off any
possible condensation water. To prevent unnecessary stag-
nation of condensation water inside the duct cooler, it must
be inclined by 10±1 degrees in the direction of the drain.
- See figure below. The G ½" condensation drain must be
connected through a water seal to prevent air leakage.
NOTE The drain must be dimensioned so as to prevent
water from stagnating in the drip tray.
CWDX
Dimensioning an Indoor Unit/Outdoor Unit.
When combining the CWDX outdoor unit with the
CWDX indoor unit, it is important that the inner vo-
lume of the CWDX coil corresponds to the outdoor unit
manufacturer's recommendations for optimal and safe
use. It is also possible to connect more than one indoor
unit to an outdoor unit. This must be done according to
the outdoor unit manufacturer's instructions.
Cleaning.
Clean the coil regularly to achieve full output.
The interval between each cleaning entirely depends on the
air quality and on how well filters and other parts of the sys-
tem are maintained. Use a soft brush to clean the intake side
of the fins and then clean the entire coil with compressed air
or by vacuuming it off. Blow away any dirt from the air out-
let end to the inlet end. Take care not to deform the edges
of the fins. Clean the bottom of the drip tray and check to
make sure the condensation drain is free of any dirt.
Design Data.
Max. operating pressure: 4.29 MPa (42.9 bar).
Max test pressure: 4.8 MPa (48 bar).
The CWDX duct coolers have been pressurised and leak
tested.
Supplied pressurised at 0.5 bar with dry air.
Check the pressure prior to installation.
Capacity.
Cooling and heating calculations can be performed using the
web-based calculation program VEAB Select (www.veab.com)
or contact our sales team for help.
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