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Instructions
• Energize the unit. It must start promptly. If the
compressor does not start, check wiring confor-
mity, voltage on terminals and sequence phase.
• Eventual reverse rotation of a 3-phase scroll
compressor can be detected by following phe-
nomena; unit is equipped with a phase-reversal
relay and compressor doesn't start, the com-
pressor doesn't build up pressure, it has abnor-
mally high sound level and abnormally low
power consumption. In such case, shut down
the unit immediately and connect the phases to
their proper terminals.
• If the rotation direction is correct the low pres-
sure indication on the low pressure gauge shall
show a declining pressure and the high pressure
indication on the high pressure gauge shall
show an increasing pressure.
12 – Check with running unit
• Check the fan rotation direction. Air must flow
from the condenser towards the fan.
• Check current draw and voltage.
• Check suction superheat to reduce risk of slug-
ging.
• When a sight glass is provided observe the oil
level at start and during operation to confirm
that the oil level remains visible.
• Respect the operating limits.
• Check all tubes for abnormal vibration. Move-
ments in excess of 1.5 mm require corrective
measures such as tube brackets.
• When needed, additional refrigerant in liquid
phase may be added in the low-pressure side as far
away as possible from the compressor. The com-
pressor must be operating during this process.
• Do not overcharge the system.
• Follow the local regulations for restoring the
refrigerant from unit.
• Never release refrigerant to atmosphere.
• Before leaving the installation site, carry out a
general installation inspection regarding clean-
liness, noise and leak detection.
• Record type and amount of refrigerant charge
as well as operating conditions as a reference for
future inspections.
13 – Maintenance
Always switch off the unit at main
switch before remove fan panel.
Internal pressure and surface tempe-
rature are dangerous and may cause
permanent injury.
Maintenance operators and installers
require appropriate skills and tools.
Tubing temperature may exceed
100°C and can cause severe burns.
Ensure that periodic service inspec-
tions to ensure system reliability and
as required by local regulations are
performed.
To prevent system related problems, following
Periodic maintenance is recommended:
• Verify that safety devices are operational and
properly set.
• Ensure that the system is leak tight.
• Check the compressor current draw.
• Confirm that the system is operating in a way
consistent with previous maintenance records
and ambient conditions.
• Check that all electrical connections are still
adequately fastened.
4 | AN40143613378401-010201 - 118A5381B
• Keep the unit clean and verify the absence of
rust and oxidation on the unit components,
tubes and electrical connections.
The condenser must be checked at least once a
year for clogging and be cleaned if deemed ne-
cessary. Access to the internal side of the conden-
ser takes place through the fan panel. Microchan-
nel coils tend to accumulate dirt on the surface
rather than inside, which makes them easier to
clean than fin-&-tube coils.
• Switch off the unit at main switch before remove
any panel from the condensing unit.
• Remove surface dirt, leaves, fibres, etc. with
a vacuum cleaner, equipped with a brush or
other soft attachment. Alternatively, blow com-
pressed air through the coil from the inside out,
and brush with a soft bristle. Do not use a wire
brush. Do not impact or scrape the coil with the
vacuum tube or air nozzle.
If the refrigerant system has been opened, the
system has to be flushed with dry air or nitrogen
to remove moisture and a new filter drier has to
be installed. If evacuation of refrigerant has to be
done, it shall be done in such a way that no refri-
gerant can escape to the environment.
Service
panel
removal
W09 Version.
Step 1: Disconnect power supply. Make sure main
switch is in off condition before servicing.
Step 2: Remove all top panel screws and then
remove Top panel.
Step 3: Remove all side panel screws.
Step 4: Remove side panel on parallel to main
switch.
procedure
for
Fig A: Fully opened condition, Port 2 and 3 is fully
opened and port 4 is fully closed
Fig B: Fully closed condition, Port 3 and 4 is
partially open and port 2 is fully closed
Fig C: Partially Opened Condition (5.5 turns clock
wise from fully opened condition. Port 2, 3, 4 is
fully opened).
14 – Declaration of incorporation
• Pressure Equipment Directive 2014/68/EU
EN 378-2:2016 - Refrigerating systems and Heat
Pumps - Safety and environmental requirements-
Parts 2: Design, construction, testing, marking
and documentation
Low Voltage Directive 2014/35/EU EN 60335-
1:2012 + A11:2014- Household and similar elec-
trical appliances-Safety-Part 1: General require-
ments-for all above mentioned condensing units
Eco-design DIRECTIVE 2009/125/ EC, esta-
blishing a framework for the setting of Eco-de-
sign requirements for energy-related products.
REGULATION (EU) 2015/1095, implementing Eco-
© Danfoss | Climate Solutions | 2022.08
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