12-26
CONTROL SYSTEM
SM DLSDCI 3-A.1 GB
12.6.4
High/Low Pressure Protection
Whenever high or low pressure accures in the system which extend beind the system pre-defined limits, the high
and low pressure switchs turns on (short) and stops the compressor until these limits are redrawn.
Fault code error 8 (HPS) or 9 (LPS) will be shown until compressor will resume operation.
12.7
Technician Test Mode
This test is aimed for the technicians to check the system under a preset compressor and outdoor
fan values while the expansion valves will function according to the normal running mode.
12.7.1
Entering Technician Mode
o
This mode is entered through the outdoor unit using the HMI (refer to user interface
section).
o
It can be selected either for cool or heat.
o
Technician test is not possible to enter during deicer.
12.7.2
Technician Mode Procedure
•
All the connected Indoor units will enter technician test at high indoor fan speed.
•
The outdoor unit will be working normally (according to the run mode control logic) except
the following changes:
o
The dry contacts inputs will be ignored.
o
Protections will be operative for stop compressor only.
o
The compressor and the outdoor fan will be working in target preset values according to
the number and size of IDUs.
12.7.3
Exiting Technician Mode
Technician mode will be exited either when:
o
Escaping by the HMI (exiting the ttC or ttH menus)
o
60 minutes are passed from entering
12.8
User Interface
12.8.1
User interface description
o
The user interface uses three 7 segments, and 4 keys.
o
Keys, The 4 keys are:
-
Scroll - used to scroll between options (up and down)
-
Select - use to select an option
-
Escape - Will go up one level in the menu
o
The user interface concept is Tree menus.
o
Active selection or status will be indicated by a dot at the
right side of the third digit.
12.8.2
Keys functionality
o
Scrolling will be done whenever the button is pressed.
o
When scrolling alpha values, if the scroll button is held in, the selection will change at the rate
of one step per second.
o
When changing/scrolling numeric value, if the scroll button is held in, the selection will change
at the rate of one step per second. After 2 seconds, if the button continues to be held in, the
rate of change will increase to 10 steps per second.
The display will not roll over during selection (for example stop/Ode/Dia/Stp/Par/stop)
TROUBLESHOOTING
Service Manual
Multi Cinco 100 DCI
12-37
Revision 0
o
It can be selected either for cool or heat.
o
Technician test is not possible to enter during deicer.
12.8.2
Technician mode procedure
All the connected indoor units will enter technician test at high indoor fan speed.
The outdoor unit will be working normally (according to the run mode control logic) except
the following changes:
o
The dry contacts inputs will be ignored.
o
Protections will be operative for stop compressor.
o
The compressor and the outdoor fan will be working in target preset values according to the
number and size of IDUs.
12.8.3
Exiting technician mode
Technician mode will be exited either when:
o
Escaping by the HMI (exiting the ttC or ttH menus)
o
60 minutes are passed from entering
12.9
User Interface
12.9.1
User interface description
o
The user interface uses three 7 segments, and 4 keys.
o
Keys, The 4 keys are:
-
Scroll - used to scroll between options (up and down)
-
Select - use to select an option
-
Escape - Will go up one level in the menu
o
The user interface concept is Tree menus.
o
Active selection or status will be indicated by a dot at the
right side of the third digit.
12.9.2
Keys functionality
o
Scrolling will be done whenever the button is pressed.
o
When scrolling alpha values, if the scroll button is held in, the selection will change at the
rate of one step per second.
o
When changing/scrolling numeric value, if the scroll button is held in, the selection will
change at the rate of one step per second. After 2 seconds, if the button continues to be
held in, the rate of change will increase to 10 steps per second.
The display will not roll over during selection (for example stop/Ode/Dia/Stp/Par/stop)
Up
Down
Esc
Select
