6
OPERATION
YCAA series chillers are equipped with an electronic
control and monitoring system as standard. The system
provides control, monitoring and alarm functions.
The system consists of an electronic circuit board and a
control panel with display and touch keys.
Control functions:
n
Compressor capacity control in two steps
n
Compressor startup delay
n
Defrost (YCAA-H Units)
n
Fan speed regulation
n
Anti-freezing protection
Alarm management and display
n
High pressure alarm.
When the alarm is activated, the control system
locks out the associated refrigerating circuit and
opens the compressor control chain (fail-safe
mode). Alarm is reset from the pressure switch and
manually from the panel.
6.1
Control Panels
n
Low pressure alarm.
When the alarm is activated, the control system
locks out the associated refrigerating circuit. Alarm
operation is delayed approximately 30 seconds
after starting. Alarm is reset manually from the
panel.
n
Anti-freezing alarm.
This alarm is activated when water temperature at
evaporator outlet drops below 4°C. The control
system locks out the associated refrigerating
circuit. Alarm is reset manually from the panel.
n
External interlock alarm.
When the alarm is activated, the control system
locks out the unit. Reset is automatic.
Remote On/Off Kit (Models 60-150 standard control
only)
The kit contains a remote control unit complete with 3
metre cable for wall mounting, additional PCB for LED
control and full installation instructions.
For larger distances upto 20 metres the cable can be
extended with a seven conductor cable (YCAA-B units)
or eight conductor cable (YCAA-H units), minimum
cross-section 0,25 mm. The conductors must be
correctly connected in accordance with the connection
diagram included in the installation instructions.
(09/03)
035B09012-100 Rev. 4
6
-
1
+
-
IN
OUT
SET
P
P
-P
-P
H 0
2
H 0
2
Circuit 1
System
Setpoints
Display
Circuit 2
®
Standard Control Panel (Models 60-150 only)
HEAT PUMP
®
®
®
®
YCAA-B
YCAA-H
Remote On/Off Panel
Summary of Contents for YCAA B 120
Page 2: ......
Page 16: ...This Page Left Intentionally Blank 09 03 2 6 035B09012 100 Rev 4 ...
Page 28: ...This Page Left Intentionally Blank 09 03 4 10 035B09012 100 Rev 4 ...
Page 36: ...Page Left Intentionally Blank 09 03 6 6 035B09012 100 Rev 4 ...
Page 40: ...Page Left Intentionally Blank 09 03 7 4 035B09012 100 Rev 4 ...
Page 68: ...Notes 09 03 11 2 035B09012 100 Rev 4 ...
Page 69: ...Notes 09 03 035B09012 100 Rev 4 11 3 ...