Demand Cooling; Oil Pressure Control; Oil Pressure Switch (Ops2) - Emerson Copeland Discus Series Application Manuallines

4.7

Demand Cooling

Legend
A ......... Alarm connection
L ......... Control voltage connection
M ......... Control circuit
S ......... Injection valve connection
L1 ....... Voltage connection
N ......... Neutral connection
Figure 18
4.8

Oil pressure control

4.8.1 Oil pressure switch (OPS2)

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 both the OPS1
and OPS2 are shown in Technical Information D7.8.3 "DWM Copeland™ Semi-hermetic
Compressor Oil Pressure Differential Switch OPS2" available at www.emersonclimate.eu. The
wiring diagram relates to an option using a 7-wire cable.
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".
20
θ1 ........ Temperature control device for
energising the injection valve
θ2 ........ Temperature control device for
switching off the compressor
A6 ........ Demand Cooling module
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 19
D6.3.4/0715-0716/E