Airwell YAZE218, Service Manual

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11—24 | SM YAZE218 1-A.2 GB
11—CONTROL SYSTEM
11.7 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.
11.7.1 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.
11.7.2 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 (not to be implemented in the
current version).
o The compressor and the outdoor fan will be working in target preset values
according to the following table:
Technician Test
Unit
Compressor Speed
OFAN speed
Cool Heat
m p r 0 0 9 8 8 6 6 8 1 2 Z A Y
11.7.3 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