Display Type of alarm Reset
A1/A2
Antifreeze alarm Manual
AHt High temperature at start up (If, P20=1 is activated) Automatic
ALt Low temperature at start up (If, P20=1 is activated) Automatic
d1-2 Defrost in operation -
dF1-2
Defrost failure Automatic
E1 Probe B1 Automatic
E2 Probe B2 Automatic
E3 Probe B3 Automatic
E6 Probe B6 Automatic
E7
Probe B7 Automatic
ELS
Low supply voltage Automatic
EHS High supply voltage Automatic
EPr Eprom error. Unit in operation Automatic
EPb Eprom error. At start up Automatic
FL Flow switch Manual
Hc1/Hc2 Compressor maintenance alarm (If C14 is activated)
Automatic
HP1/HP2 High pressure or discharge protection Manual
LP1/LP2 Low pressure Manual
tC1/tC2 Fan or compressor module thermal protection Manual
TP General system protection Manual
Table of alarms
Alarm reset
Pressing the UP and DOWN keys for over 5 seconds will
cancel alarms present in the memory. The alarm message
will also disappear from the display and the alarm relay will
be deactivated.
Forces defrost (heat pumps)
Pressing the SEL and UP keys simultaneously for over 5
seconds activates the forced defrost cycle of the unit.
Clearing hour counters
When displaying compressor or heat pump operating hours
(parameters c10, c11 and c15), the counter can be cleared
by pressing the UP and DOWN keys simultaneously.
Pump operation
Four operating modes of the water pump can be selected in
accordance with the value give to the H5 parameter. H5=0
(pump not enabled), H5=1 (pump always on), H5=2 (pump on
controlled by the regulator or in parallel with the compressor),
H5=3 (pump goes off and on at regular intervals, independent
of compressor operation [parameters c17 and c18]).
Probe calibration
If necessary, the probes can be calibrated by using the /13, /14,
/15, /16, /19 and /20 parameters. See Probe set parameters.
Remote ON/OFF
A remote ON/OFF intake can be connected between ter-
minals ID5 and B on the connecting strip. To activate this
intake, give value 1 to parameter H07 (H07 = 1). When this
intake is open, the unit remains in OFF mode. When closed,
the unit remains in ON mode. This option does not disable
the ON/OFF function of the keyboard.
Remote COOL/HEAT
A remote COOL/HEAT intake can be connected between
terminals ID6 and B on the connecting strip. To activate this
intake, give value 1 to parameter H06 (H06 = 1). When this
intake is open, the unit remains in HEAT mode. When closed,
the unit remains in COOL mode. This option does not disable
the HEAT/COOL function of the keyboard.
Description of YLCC and YLCC-H 122 and 152
control system
This is a multipurpose controller especially programmed
for use with water chillers and air-water heat pump units
equipped with two tandem compressors, four power stages
and two cooling circuits.
Main functions
- Controls water temperature (at intake or outlet. See param-
eter r6).
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