© Copyright Danfoss | Commercial Compressors | 2014.11
FRCC.PI.018.A3.02 - November 2014
Danfoss scroll compressors
PSH051-064-077
Instructions
Installation and servicing of the compressor by qualified personnel only. Follow
these instructions and sound refrigeration engineering practice relating to installation,
commissioning, maintenance and service.
1
2
3
5
4
E
F
C
D
A
B
A
: Model number
D
: Supply voltage, Starting current & Maximum operating current
B
: Serial number
E
: Housing service pressure
C
: Refrigerant
F
: Factory charged lubricant
1
: Discharge temperature sensor (supplied but
need to be connected)
2
: Liquid Injection Valve (supplied)
3
: Liquid Injection Valve connection 1/4” ODF
4
: Surface Sump Heater (SSH) (supplied)
5
: Rigid mounting spacer (supplied)
The compressor must only be used for its
designed purpose(s) and within its scope of
application (refer to «operating limits»).
Consult Application guidelines and datasheet
available from cc.danfoss.com
Under all circumstances,
the EN378 (or other
applicable local safety
regulation) requirements
must be fulfilled.
The compressor is delivered under ni-
trogen gas pressure (between 0.3 and
0.7 bar) and hence cannot be connec-
ted as is; refer to the «assembly»
section
for further details.
The compressor must be
handled with caution in the
vertical position (maximum
offset from the vertical : 15°)
Danfoss scroll compressors PSH051-064-077
come equipped with an electronic board OCS (Opera-
ting Control System) protecting against phase loss/reversal, motor overheating, high current draw,
and giving extra features such as liquid injection, discharge temperature protection, envelope
monitoring, data storage, bus communication and crankcase heater control.
A1
A3
A2
OCS
S
KS
LPS
CC
Legend:
Fuses ..........................................................................................F1
Compressor contactor .........................................................KM
Control relay ...........................................................................KA
Safety lock out relay .............................................................. KS
Optional short cycle timer (3 min) ............................... 180 s
High pressure safety switch.................................................HP
Control device .........................................................................TH
Fused disconnect ...................................................................Q1
Compressor motor ................................................................. M
Thermistor chain.......................................................................S
Safety pressure switch ........................................................ LPS
Control circuit ........................................................................CC
Operating Control System ...............................................OCS
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
Area1: Continuous running SH 5K to 20K
Area 2.1: 31 s maximum
Area 2.2: 31 s maximum
Area 2.3: 3 min maximum
Area 1+2.3+3: Start / Restart map
Discharge pressure warning
T
C
(°C
)
T
0
(°C)
2.1
2.2
1
2.3
3
1 – Introduction
These instructions pertain to the PSH scroll
compressors used for heat pump and air-
conditioning systems. They provide necessary
information regarding safety and proper usage
of this product.
2 – Handling and storage
• Handle the compressor with care. Use the
compressor lifting lugs and use appropriate
and safe lifting equipment.
• Avoid any shocks to the liquid Injection valve
during handling operations.
• Store and transport the compressor in an
upright position.
• Store the compressor between -35°C and 51°C.
•
Don’t expose the compressor and the
packaging to rain or corrosive atmosphere.
3 – Safety measures before assembly
Never use the compressor in a flammable
atmosphere.
• The compressor ambient temperature may not
exceed 50°C 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 PSH, use equipment
specifically 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.
4 – Assembly
• In parallel assemblies of PSH the compressor
