C6.1.6/0613-0915/E 11
at all times. In case of controller breakdown the low pressure switch could be used for
emergency operation (rewiring required).
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 ZX condensing unit has the following features:
Liquid line assembly (filter drier and sight glass/moisture indicator)
Anti-corrosion treatment to the condenser fins
The electronic controller is also the base controller for the connection of many optional and
customer supplied functions such as:
Main load controller (or thermostat)
Evaporator electric defrost heater contactor
Evaporator fan contactor
Superheat controller for one electronic expansion device (not available on ZXLE models)
2.8.4 Additional features for customization
A lot of additional features are provided by the XCM-25D controller. In the European design of
the electrical panel a few of the additional functionalities are prearranged and can easily be
installed by connecting additional hardware to the electrical terminals. The tables in Appendix 6
show the parameters that have to be changed in case a special feature of the controller should
be activated. The tables do not show the required settings which have to be done by the system
operator, eg, choosing correct set points for different components and different applications.
Prearranged terminals /
Wiring diagram
Low pressure switch, optional; can be
ordered factory-installed.
Solenoid valve liquid line
Room thermostat for pump-down or direct
control
Sensor for evaporator or room
Sensor for evaporator or room (NTC10kΩ)
Table 8: Prearranged additional connections
Figure 8: Prearranged additional connections
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