Instructions
8510197P05F - AN24598649703302en-000501 | 5
© Danfoss | DCS (CC) | 2019.01
5 – Handling and storage
• Handle the compressor with care. Use the
dedicated handles in the packaging. Use the
compressor lifting lug and use appropriate
and safe lifting equipment.
• Store and transport the compressor in an
upright position.
• Store the compressor between Ts min and Ts
max values for LP side indicated on compres-
sor nameplate.
• Don’t expose the compressor and the packa-
ging to rain or corrosive atmosphere.
6 – Safety measures before assembly
Never use the compressor in a flammable at-
mosphere.
• Check before assembly that the compressor
does not show any obvious signs of deteriora-
tion that could have occurred during inappro-
priate transportation, handling or storage.
• The compressor ambient temperature may
not exceed Ts max value for LP side indicated
on compressor nameplate during off-cycle.
• Mount the compressor on a horizontal flat
surface with less than 3° slope.
• Verify that the power supply corresponds to
the compressor motor characteristics (see
nameplate).
• When installing DSH, SH, WSH or SZ, use
equipment specifically reserved for HFC re-
frigerants which was never used for CFC or
HCFC refrigerants.
• Use clean and dehydrated refrigeration-grade
copper tubes and silver alloy brazing material.
• Use clean and dehydrated system components.
• The piping connected to the compressor must be
flexible in 3 dimensions to dampen vibrations.
7 – Assembly
• The compressor must be mounted on rails or
chassis according to Danfoss recommenda-
tions described in related product guidelines
(type of spacer, tightening torques).
• Slowly release the nitrogen holding charge
through the schrader port.
• Remove the gaskets when brazing rotolock
connectors.
• Always use new gaskets for assembly.
• 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
technique 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.
•
Do not exceed the maximum tightening
torque for rotolock connections:
Rotolock connections Tightening torque
1" rotolock
80 Nm
1 1/4 " rotolock
90 Nm
1 3/4" rotolock
110 Nm
2 1/4" rotolock
145 Nm.
8 – Leak detection
Never pressurize the circuit with oxygen or
dry air. This could cause fire or explosion.
• SM 084 to 185, SY 380, SZ 084 to 185, SZ 380,
DSH / SH / WSH 090 to 184: Pressurize the
system on HP side first and then on LP side.
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.
• Do not use dye for leak detection.
• Perform a leak detection test on the complete
system.
• The test pressure must not exceed 1.1 x PS
value for LP side and PS value for HP side indi-
cated on compressor nameplate.
• When a leak is discovered, repair the leak and
repeat the leak detection.
9 – 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.
10 – Electrical connections
• Switch off and isolate the main power supply.
See overleaf for wiring details.
• All electrical components must be selected as
per local standards and compressor require-
ments.
• Refer to section 4 for electrical connections
details.
• The Danfoss scroll compressors 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.
• Use ø 4.8 mm (3/16”) screws and ¼” ring ter-
minals for the power connection. Fasten with
3 Nm torque.
• The thermostat connection (if present) is a ¼”
AMP-AWE spade connector.
• The compressor must be connected to earth
with the 5 mm earth terminal screw.
11 – 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
excessive 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 in-
dicated charge limits if possible. Above this
limit; protect the compressor against liquid
flood-back with a pump-down cycle or suc-
tion line accumulator.
• Never leave the filling cylinder connected to
the circuit.
Compressor models
Refrigerant charge
limit (kg)
SM/SZ 084, 090, 100
8.5
SM/SZ 110, 120
10
SM 112, 124, 147 , SZ147
7.9
SM/SZ 115, 125
11
SM/SZ 148, 160, 161
12.5
SM/SZ 175, 185
13.5
SY/SZ 240
16
SY/SZ 380
20
DSH / SH / WSH 090
5.9
DSH / SH / WSH 105, 120,
140, 161, 184
7.9
SH 180, 240, 295, 300
13.5
DSH 240,295
15
SH 380
14.5
SH 485, DSH600,
DSH 381,485
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