Emerson Copeland EazyCool OM 501 Series Application Manuallines page 19

Fixed high-pressure switches: This is a non-adjustable protection device designed to
prevent the compressor from operating outside of its safe high pressure range. Reset is
automatic.

OL(T)E & OM(T)E models:
The high pressure cut out device is in the same safety chain like the discharge line
thermostat. The alarm provided by the XCM-25D does not indicate if it is high pressure
or high discharge temperature alarm.
Adjustable high pressure limitation: The unit controller provides the possibility to stop
the unit at a required discharge pressure which is lower than the cut-out value of the fixed
high-pressure switch. High alarm value can be adjusted by parameter E58.
Discharge temperature protection: Each unit is equipped with a discharge line
thermostats (DLT). The DLT's are in the same safety chain like the high pressure cut out
switches and a common alarm. Each compressor has its own safety chain.
Adjustable low pressure alarm: The unit controller features an adjustable low pressure
alarm managed by the suction pressure sensor. The factory setting of this alarm is the
lowest permitted pressure of the refrigerant with the lowest pressure-vapor properties. If
needed the user can modify this value per the required application.

OM(T)E models:

OL(T)E models:
Option: Adjustable low-pressure switches PS1: This device protects the system
against low pressure operation. It must be adjusted depending on running conditions and
potential special requirements. The compressor envelopes published in Select must be
respected always. In case of controller breakdown, the low-pressure switch is used for
emergency operation (prewired rescue mode components)
A crankcase heater is directly connected to the controller. The crankcase heater will be
energized when the ambient sensor is below a given value (10°C) and the compressor
has been off for a period of time (5 minutes). The minimum off time does not apply at
initial power up.
In addition to the above, the condensing unit has the following features:

Liquid line assembly (filter drier and sight glass/moisture indicator)

Anti-corrosion treatment to the condenser fins
14
28.8 bar cut-out / 24 bar cut-in.
0.8 bar rel
0.3 bar rel
C6.1.9/0617/E