Original instructions
Installation manual
16
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
AL03
High pressure
Circuit 1
High pressure alarm from
circuit 1 (high pressure
switch)
Check condensing pressure.
M
No
All compressors
circuit 1
Check refrigerant charge.
Check condensing fan/s operation
Check the presence of warm
condensing air recycling.
Check condensing coil cleaning and
eventually clean it.
Reset the high pressure switch before
resetting the alarm in the controller.
Check the correct intervention set for
the high-pressure switch.
AL04
High pressure
Circuit 2
High pressure alarm from
circuit 2 (high pressure
switch)
Check working conditions.
M
No
All compressors
circuit 2
Check condensing pressure.
Check refrigerant charge.
Check condensing fan/s operation
Check the presence of warm
condensing air recycling.
Check condensing coil cleaning and
eventually clean it.
Reset the high pressure switch before
resetting the alarm in the controller.
Check the correct intervention set for
the high-pressure switch.
AL05
Antifreeze alarm
Digital input 1 open
Check working conditions.
A (2)
No
Compressors (only
cooling mode)
AL06
High temp
threshold
exceeded
Indoor temperature exceeds
the max value set
Check working conditions.
A
No
None
AL07
Low temp
threshold
exceeded
Indoor temperature is lower
than the min value set
Check working conditions.
A (2)
No
None
AL08
Low pressure
Circuit 1 in summer
Low pressure alarm circuit 1
from the low-pressure switch
(cooling mode)
Check working conditions.
M
No
All compressors
circuit 1
Check evaporation pressure.
Check refrigerant charge
Check evaporation fans.
Check the correct intervention of the
low-pressure switch.
AL09
Low pressure
Circuit 2 in summer
Low pressure alarm circuit 2
from the low pressure switch
(cooling mode)
Check working conditions.
M
No
All compressors
circuit 2
Check evaporation pressure.
Check refrigerant charge
Check evaporation fans.
Check the correct intervention of the
low-pressure switch.
AL10
Low pressure
Circuit 1 in winter
Low pressure alarm circuit 1
from the low pressure switch
(heating mode)
Check working conditions.
M
No
All compressors
circuit 1
Check evaporation pressure.
Check refrigerant charge
Check evaporation fans.
Check the correct intervention of the
low-pressure switch.
AL11
Low pressure
Circuit 2 in winter
Low pressure alarm circuit 2
from the low-pressure switch
(heating mode)
Check working conditions.
M
No
All compressors
circuit 2
Check evaporation pressure.
Check refrigerant charge
Check evaporation fans.
Check the correct intervention of the
low-pressure switch.
AL12
Compressor 1
maintenance
It has been exceeded
Compressor 1 operating
hours threshold.
Check the compressor working
conditions.
M (1)
No
None
Summary of Contents for UATYQ25ABAY1
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