Airwell DLF 18 DCI, Technical Manual

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12-2
CONTROL SYSTEM
SM DL
F 1
-A.1 GB
12.6.4 High/Low Pressure Protection
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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:
R
The dry contacts inputs will be ignored.
R
Protections will be operative for stop compressor only.
R
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
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o
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- 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
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of one step per second.
o
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@ [@} %@ %
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