Original instructions
Installation manual
21
We reserve the right to make changes without any prior notice.
UATYQ*Y1
Packaged Rooftop
4P522681-1A
CODE
DESCRIPTION
MAIN CAUSES
CHECKS AND TROUBLESHOOTING RESET UNIT
OFF
ITEMS OFF
AL79
WARNING Circuit
2 in low pressure
prevention
Evaporation pressure of
circuit 2 in heating (winter)
mode is lower than the low
pressure prevention value
Check working conditions.
A (2)
No
A compressor of
circuit 2
Check evaporating pressure.
Check evaporating fans and coil.
Check evaporating coil air flow.
Check refrigerant charge
(1) Maintenance alarms must be reset from masks Ac-Ad-Ae of the Maintenance menu and they cannot be reset by
pressing the Alarm key
(2) The alarm is reset automatically, but to clear the alarm visualization it is necessary to press and hold the Alarm
key for at least 2 seconds.
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