Instructions
2 | AN323020831102en-000101 - 8510294P01C
© Danfoss | DCS (CC) | 2020.07
M
DGT
HP
UNIT
CONTROLLER
SS
CC
F1
F1
KM
CB
Ph
L1
L1
L3
L3
L2
T1
T3
T2
KM
SSH
LPS
Ph
DSF 090-200
DSF 090-175
DSF200
These Danfoss scroll compressors are protected against overheating and
overloading by an internal safety motor protector. However, an external
manual reset overload protector is recommended for protecting the circuit
against over-current.
4 - Electrical connections details
Legend:
Fuses ........................................................................................... F1
Compressor contactor ......................................................... KM
High pressure safety switch .................................................HP
Safety pressure switch .........................................................LPS
Discharge gas temperature protection ......................... DGT
Compressor motor ...................................................................M
Surface sump heater ........................................................... SSH
Thermal magnetic motor circuit breaker ...................... CB
Phase sequence relay .............................................................Ph
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 DSF, use equipment specifi-
cally reserved for HFC refrigerants 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
130 Nm.
8 – Leak detection
Never pressurize the circuit with oxygen or
dry air. This could cause fire or explosion.
• DSF090 to 200: 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 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
