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Instructions
• The piping connected to the compressor must
be flexible in 3 dimensions to dampen vibrations.
4 – Assembly
• In parallel assemblies of PSH the compressor
requires a rigid mounting on the rails. Use the
pre-mounted rigid spacers.
• Slowly release the nitrogen holding charge
through the schrader port.
• Connect the compressor to the system as
soon as possible to avoid oil contamination
from ambient moisture.
• Avoid material entering into the system while
cutting tubes. Never drill holes where burrs
cannot be removed.
• Braze with great care using state-of-the-art tech-
nique and vent piping with nitrogen gas flow.
• Connect the required safety and control de-
vices. When the schrader port is used for this,
remove the internal valve.
• The liquid injection valve must be fed by li-
quid, picked-up on the liquid line of the sys-
tem, downstream the filter drier.
• Protect the compressor and the liquid injec-
tion valve against heat while brazing the li-
quid line.
5 – Leak detection
Never pressurize the circuit with oxygen or
dry air. This could cause fire or explosion.
• Pressurize the system on HP side first and then
on LP side. Never let the pressure on LP side ex-
ceed the pressure on HP side with more than 5
bar. Such pressure difference could cause inter-
nal compressor damage.
• Do not use dye for leak detection.
• Perform a leak detection test on the complete
system.
• The test pressure must not exceed :
Models
LP side
PSH 038.051.064.077
30 bar
• When a leak is discovered, repair the leak and
repeat the leak detection.
6 – Vacuum dehydration
• Never use the compressor to evacuate the
system.
• Connect a vacuum pump to both the LP & HP
sides.
• Pull down the system under a vacuum of 500
µm Hg (0.67 mbar) absolute.
• Do not use a megohmmeter nor apply power
to the compressor while it is under vacuum as
this may cause internal damage.
7 – Electrical connections
• Switch off and isolate the main power supply.
• All electrical components must be selected as
per local standards and compressor require-
ments.
• The Danfoss scroll compressor only works
correctly in one rotation direction. Line
phases L1, L2, L3 must absolutely be connec-
ted to compressor terminals T1, T2, T3 to
avoid reverse rotation.
• Electrical power is connected to the com-
pressor terminals by M5 studs and nuts. Use
appropriate ring terminals, fasten with 3Nm
torque.
• The compressor must be connected to earth
with the 5 mm earth terminal screw. The
maximum torque is 4Nm.
For option AKA (with OCS) :
• Connect the discharge temperature sensor
cable plug to the sensor on the compressor
top shell.
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.
© Danfoss | Climate Solutions (CC) | 2021.02
• Connect the OCS to power supply and earth
• Connect the low pressure (LP) and high pres-
sure (HP) transmitters to the OCS. These are
mandatory for the operating envelope moni-
toring function.
• Only one set of LP/HP transmitters is manda-
tory for manifolds.
• Connect the M1-M2 control circuit to the OCS
• Further connections to the OCS are factory-
prepared; DGT sensor (Discharge Gas Tempe-
rature), Heater (Surface Sump Heater), motor
protection, phase monitoring, LIV valve (li-
quid injection valve). The connector positions
are written on the OCS protection cover.
To avoid personal injury, do not forget to
connect the earth, and to check for earth conti-
nuity.
8 – Filling the system
• Keep the compressor switched off.
• Fill the refrigerant in liquid phase into the
condenser or liquid receiver. The charge must
be as close as possible to the nominal system
charge to avoid low pressure operation and ex-
cessive superheat. Never let the pressure 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 indica-
ted 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)
PSH 038.051.064
PSH 077
HP side
48 bar
9 – Verification before commissioning
Use safety devices such as safety pressure
switch and mechanical relief valve in com-
pliance with both generally and locally appli-
cable regulations and safety standards. Ensure
that they are operational and properly set.
Check that the settings of high-pressure
switches and relief valves don't exceed the
maximum service pressure of any system com-
ponent.
• A low-pressure switch is recommended to
avoid vacuum operation. Minimum setting
for PSH: 2.1 bar g.
• Verify that all electrical connections are pro-
perly fastened and in compliance with local
regulations.
• Ensure that the liquid injection valve (LIV) coil
is correctly positioned on the LIV body: one of
the lock pins on the coil must fit into one of
the dents on the valve body.
10 – Start-up
• 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
promptly. If the compressor does not start,
check wiring conformity and voltage on ter-
minals.
• If the internal pressure relief valve is opened
(PSH), the compressor sump will be warm and
the compressor will trip out on the motor pro-
tector.
11 – Check with running compressor
• Check current draw and voltage.
• Check suction superheat to reduce risk of
slugging.
• Observe the oil level in the sight glass for
about 60 minutes to ensure proper oil return
to the compressor.
• 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 com-
pressor must be operating during this process.
• Do not overcharge the system.
• Never release refrigerant to atmosphere.
• 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.
12 – Maintenance
Internal pressure and surface temperature
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 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.
13.5
• Ensure that the system is leak tight.
14.5
• Check the compressor current draw.
• Confirm that the system is operating in a way
consistent with previous maintenance re-
cords 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 compres-
sor shell, tubes and electrical connections.
• Check and clear alarms and warnings.
• Check correct operation of the surface sump
heater.
13 - Warranty
Always transmit the model number and serial number
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 instruc-
tions pertaining to installation, application or
maintenance.
• Use in mobile applications.
• Use in explosive atmospheric environment.
• No model number or serial number transmit-
ted with the warranty claim.
14 – Disposal
Danfoss recommends that compressors
and compressor oil should be recycled
by a suitable company at its site.
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