Airwell AW-HJD009-N11, Service Manual

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12.6.3 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
x
All the connected indoor units will enter technician test at high indoor fan speed.
x
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.
12.7.3 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
Up
Down
Esc
Select
CONTROL SYSTEM
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SM
HJD
DCI 1-A GB
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