12-13
CONTROL SYSTEM
SM OU12HP 2-E.2 GB
12.5.11.1 1 Level Logic
P2 P3 Level
Don’t care 1 Normal
Don’t care 0 Overflow
12.5.12 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 28 (HPS) or 29 (LPS) will be shown until compressor will resume operation.
12.6 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.
12.6.1 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.
Exiting technician mode
Technician mode will be terminated either when:
o Escaping by the HMI (exit from the ttC or ttH menus)
o 60 minutes are passed from entering
ANY
0
ON
NLOAD
PUMP
OFF
ON
OPER
LED
OFF
Overflow
Water Level
Normal
BLINK
NLOAD is
forced to 0
8 min 8 min
Overflow when
unit is ON
Overflow when
unit is OFF
8 min
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