T-CU19-JAN24-1
Page 15
•
Check compressor suction superheat. This should be
between 10K and 20K in normal operating conditions.
•
Final adjustment of controller settings.
•
Allow the system to run for 3
–
4 hours. Check
compressor oil level and top up with the correct oil
type as required (see
Table 2
). Recheck the compressor
oil level again after 24 hours operation.
•
Carry out final leak test and ensure all panels/covers
are fitted and screws tightened.
•
Log all information along with the system model and
serial numbers for future reference.
•
Ensure that the customer / responsible person is
provided with basic operating instructions and where
electrical isolators are situated in case of emergency.
User Terminal Interface
–
LCD
Display
The user terminal can be used to perform all the operations
allowed by the program, display the operating conditions
of the unit all the time, and set the parameters. It can be
disconnected from the main board, and in fact is not
required for operation.
Figure 10: LCD Display
Table 12: LCD Display Button Functions
ALARM
Displays the alarms. Press around 2 seconds to
reset the alarm manually after the fault is
removed.
UP
If the cursor is in the home position (top left
corner), scrolls up the screens in the same group;
if the cursor is in a setting field, and increases the
value.
DOWN
If the cursor is in the home position (top left
corner), scrolls down the screens in the same
group; if the cursor is in a setting field, and
decreases the value.
ENTER
Used to move the cursor from the home position
(top left corner) to the setting fields, in the setting
fields confirms the set value and moves to the
next parameter.
PRG
Accesses the menu for selecting the group of
parameters to be displayed/modified (access to
the parameters is confirmed by pressing the
[Enter] button).
ESC
Used to move back to previous screen/sub-menu.
Continuous pressing of the ESC button will
eventually return to the HOME screen.
Controller Home Screen
Start Up Screen
Following controller power-up and initialization process
(approximately 1 minute), the controller home screen will
appear as follows:
The suction pressure, discharge pressure and compressor
running rps of the unit are displayed. If Unit Off by
keyboard is indicated in the lower box, then the unit is
switched OFF on the controller. To switch the unit ON, follow
instructions on
Page 16
(Switch Unit ON/OFF by Controller).
Further information on the system conditions can be
displayed by pressing the DOWN arrow.
All controller parameters are preset in the
factory and are protected by password. It
depends on the inserted password for
different levels of accessibility.
Press “P
RG
”
to enter screen Password management.
Password for Accessibility Level
•
User: 0000 (only can change suction line setpoint (screen
Ab01, default 3.3barg) and Condensing setpoint
(Screen Ab05, default: 16barg), not authorization to
switch on/off by keyboard).
•
Service: 1001 (access for all operation parameters,
except “advanced” configuration parameter).
•
Manufacturer: 9009 (access to "advanced"
configuration parameters, e.g., C. Compressor->
Advanced, to change type of Refrigerant, compressor
model etc).
To change the parameter, the unit must be in
OFF mode. To access through different levels,
first need to logout from existing password
by scrolling to mask Ge02 Logout.
