Instructions
8510294P01C - AN323020831102en-000101 | 3
© Danfoss | DCS (CC) | 2020.07
on LP side exceed the pressure on HP side
with more than 5 bar. Such pressure difference
could cause internal compressor damage.
• Keep the refrigerant charge below the indi-
cated charge limits if possible. Above this limit;
protect the compressor against liquid flood-
back with a pump-down cycle or suction line
accumulator.
• Never leave the filling cylinder connected to
the circuit.
Compressor models
Refrigerant charge
limit (kg)
DSF 115-130-155-175-200
10
DSF 090-100
8
12 – Verification before commissioning
Use safety devices such as safety pressure swit-
ch and mechanical relief valve in compliance with
both generally and locally applicable regulations
and safety standards. Ensure that they are opera-
tional and properly set.
Check that the settings of high-pressure swit-
ches and relief valves don’t exceed the maximum
service pressure of any system component.
•
A low-pressure switch is recommended to
avoid vacuum operation. Minimum setting for
DSF: 1.5 bar g.
• Verify that all electrical connections are proper-
ly fastened and in compliance with local regu-
lations.
• When a crankcase heater is required, it must be
energized at least 12 hours before initial start-
up and start-up after prolonged shutdown for
belt type crankcase heaters (6 hours for surface
sump heaters).
13 – Start-up
Never operate the compressor without the
electrical box cover fitted.
• Never start the compressor when no refrige-
rant is charged.
• All service valves must be in the open position.
• Balance the HP/LP pressure.
• Energize the compressor. It must start promp-
tly. If the compressor does not start, check wi-
ring conformity and voltage on terminals.
• Eventual reverse rotation can be detected by
following phenomena; the compressor doesn’t
build up pressure, it has abnormally high sound
level and abnormally low power consumption.
In such case, shut down the compressor imme-
diately and connect the phases to their proper
terminals. Danfoss DSF scroll compressors are
protected against reverse rotation either by an
internal reverse rotation protection. They will
shut off automatically.
• If the internal overload protector trips out, it
must cool down to 60°C to reset. Depending
on ambient temperature, this may take up to
several hours.
14 – Check with running compressor
• Check current draw and voltage.
• Check suction superheat to reduce risk of slug-
ging.
• Observe the oil level in the sight glass for about
60 minutes to ensure proper oil return to the
compressor.
• 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 as possible from the compressor. The
compressor must be operating during this pro-
cess.
• Do not overcharge the system.
• Never release refrigerant to atmosphere.
• For reversible systems, ensure that the 4-way
valve does not reverse when the compressor
is stopped due to heating or cooling demand
(stop on thermostat)
• Before leaving the installation site, carry out
a general installation inspection regarding
cleanliness, noise and leak detection.
• Record type and amount of refrigerant charge
as well as operating conditions as a reference
for future inspections.
15 – Maintenance
Internal pressure and surface temperature
are dangerous and may cause permanent inju-
ry.Maintenance operators and installers require
appropriate skills and tools. Tubing temperature
may exceed 100°C and can cause severe burns.
Ensure that periodic service inspections to
ensure system reliability and as required by local
regulations are performed.
To prevent system related compressor 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.
• Keep the compressor clean and verify the ab-
sence of rust and oxidation on the compressor
shell, tubes and electrical connections.
16 - Warranty
Always transmit the model number and serial nu-
mber with any claim filed regarding this product.
The product warranty may be void in following
cases:
• Absence of nameplate.
• External modifications; in particular, drilling,
welding, broken feet and shock marks.
• Compressor opened or returned unsealed.
• Rust, water or leak detection dye inside the
compressor.
• Use of a refrigerant or lubricant not approved
by Danfoss.
• Any deviation from recommended instructions
pertaining to installation, application or main-
tenance.
• Use in mobile applications.
• Use in explosive atmospheric environment.
• No model number or serial number trans-
mitted with the warranty claim.
The compressor is not designed to withstand
natural disasters such as earthquakes, cyclones,
floods…. or extreme events such as fires, terrorist
attacks, military bombardments, or explosions of
any kind.
Danfoss Commercial Compressor is not liable
for any malfunction of its product resulting from
such events
17 – Disposal
Danfoss recommends that compressors
and compressor oil should be recycled
by a suitable company at its site.
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products
already on order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed.
All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
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