York YLCC-H Technical Information page 37

- Manages defrost cycle.
- Manages system operation and safety.
- Manages alarms.
- Monitoring and tele-assistance connection (RS485 serial
connection accessory).
Devices controlled
- Compressors
- Fans
- 4-way valve
- Water pump
- Alarm device
Standard components
- System and first circuit control base plate. This is the
central nucleus that processes the signals coming from
the probes and protection elements of the entire system to
control its active elements: compressors  and 2, fan, 4-way
valve, water circulation pump and alarm relay. 24 Vac power
supply.
Can also be used for accessing and controlling the system
by means of the display, keys and LEDs available. Allows
selecting cool, heat and off functions. Also allows changing
operating parameters, as well as monitoring the system.
- Second circuit expansion and control module. This is
an expansion of the base plate and can be connected by
means of two cables. Controls operation of compressors 3
and 4, fan and 4-way valve.
- Fan ON/OFF control module. Used on heat pump units
with centrifugal fans and three-phase motor with no speed
control. These modules should be connected to the base
and expansion plates respectively. They act directly upon
the fan contactor.
- NTC probes. 5 NTC probes are used to read system
temperatures. One is located at the common water intake of
the two evaporating units, another two at each water outlet
of said units, and the remaining two at each coil to control
defrost cycles. (On cooling units, 3 NTC probes are used:
one at water intake and two at water discharge).
Parameters
The set of parameters that makes up the operating program of
the unit is divided into four levels (Factory, Super User, User
and Direct), depending upon the function of each parameter
and the access level for the user.
All parameters of each individual level, as well as those of
all lower levels, can be modified.
Factory level
Accessible by using the password Factory. Allows setting of
all unit parameters.
Super User level
Accessible by using the password Super User. Allows setting
of all Super User, User and Direct parameters.
User level
Accessible by using the password 22. Allows access to the
usual parameters to be set by the user.
Direct level
Accessible without a password. Allows reading out values
detected by the probes, as well as other system values. Can
be used by the user without affecting unit operation.
General information
Modification of parameters that affect the basic configuration
of the unit should be made with the controller in Standby
position.
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