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© 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

(°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 

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