York YLCC-H, Technical Information

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Operating and start-up instructions
Description of YLCC and YLCC-H 42 to 102
control system
This is a multipurpose controller especially programmed
for use with water chillers and air-water heat pump units
equipped with two compressors, two power stages and two
cooling circuits.
Main functions
- Controls water temperature (at intake or outlet. See param-
eter r6).
- 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: compressor , 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 compressor 2,
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 tem-
peratures. 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 the 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.