Emerson Copeland 2D User Manual

AGL_HA_ST_Discus_A2L_A1_EN_Rev00 21
4.7 Oil differential pressure control
4.7.1 Electronic oil pressure switch OPS2
WARNING
Ignition source in a potentially flammable atmosphere! Fire hazard! The
electronic oil pressure switch is not an ignition source during normal operation
in an A2L-
refrigerant system but could become one if not installed and
connected properly.
The specifications for the OPS2 oil pressure switch are as follows:
 Differential pressure: 0.95 ± 0.15 bar
 Time delay: 120 ± 15 sec
Where there is a 5-wire cable connection between the electrical control panel and the compressor
terminal box to the OPS module, the same wires can be applied to the OPS2 which will give the
functions of an OPS1 module.
To obtain use of all of the features of the OPS2 a 7-wire cable between the electrical control cabinet
and the compressor terminal box should be used. Wiring diagrams for OPS2 are shown in Technical
Information D7.8.3 "DWM Copeland™ Semi-hermetic Compressor Oil Pressure Differential Switch
OPS2" available at www.climate.emerson.com/en-gb
. The wiring diagram in Figure 25 below relates
to an option using a 7-wire cable.
Wiring:
Brown (BN) = Power supply input
Violet (VIO) = Running signal from the compressor
Grey (GR) = Input changeover contact from the
daisy chain
Orange (OG) = Output changeover contact linked to
the compressor contactor
Pink (PK) = Output changeover contact linked to the
alarm
Blue (BU) = Power supply output
Figure 25: Wiring diagram OPS2
NOTE: Where a 5- or 7-wire cable is stated a 4- or 6-wire cable is required. In some countries
only a 5- or 7-wire cable is available. See more information about OPS2 in Technical
Information D7.8.3 "DWM Copeland™ Semi-hermetic Compressor Oil Pressure Differential
Switch OPS2".
4.7.2 Electro-mechanical oil pressure switch – Alco Controls FD-113ZU
The oil differential pressure switch FD-113ZU from Alco Controls is released for A1 refrigerants only.
Application with A2L refrigerants is not possible.
The specifications for the FD-113ZU electro-mechanical oil pressure switch are as follows:
 Cut-out pressure: 0.63 ± 0.14 bar
 Cut-in pressure: 0.9 ± 0.1 bar
 Time delay: 120 ± 15 sec

Emerson Copeland 2D Specifications

General

Brand	Emerson
Model	Copeland 2D
Category	Air Compressor
Language	English