2 | © Danfoss | DCS (CC) | 2018.02
FRCC.PI.020.A2.02
1 – Introduction
These instructions pertain to the Danfoss PSH
scroll compressors, models PSH019-023-026-030-
034-039, used for heat pump and air-conditio-
ning systems. They provide necessary informa-
tion regarding safety and proper usage of this
product.
2 – Handling and storage
• Handle the compressor with care. Use the com-
pressor 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 70°C.
• Don’t expose the compressor and the packa-
ging to rain or corrosive atmosphere.
3 – Safety measures before assembly
Never use the compressor in a flammable at-
mosphere.
Instructions - PSH Compressors
PSH019-023-026-030-034-039
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 connect-
ed 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 PSH019-023-026-030-034-039 compressors are protected against overheating and overloa-
ding by an internal safety motor protector. However, an external manual reset overload protector
is recommended for protecting the circuit against over-current. The compressors come equipped
with an electronic board OCS (Operating Control System) controlling liquid injection and a liquid
injection valve assembly.
L1 L3 L2
Q1
CONTROL CIRCUIT
F1
F1
KM
KA
KA
KS
KS
J1
J3
PT1000
OCS
J5
J2
KS
HP
TH
180 s
85 52 019 - A
T1
T2
M
T3
KA
KA
A1
A2
A3
LPS
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
Fused disconnect ......................................................................Q1
Compressor motor .....................................................................M
Discharge gas temperature ................................................DGT
Safety pressure switch ............................................................LPS
Control circuit ........................................................................... CC
Operating Control System .................................................. OCS
Wiring diagram without pump-down cycle
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
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
: Liquid Injection Valve
2
: Liquid Injection Valve connection
3
: Oil sight glass
15
20
25
30
35
40
45
50
55
60
65
70
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
To (°C)
Tc
(°
C)
SH 5K
