9.7.3 High pressure protection (Code: AL02)
Whenever DI3=OFF is checked out, all the compressors will be stopped, other parts will
keep its original state. A continuous blink code AL02 will appear on the LCD, until
DI2=ON, the unit will turn to its normal work.
9.7.4 Low outlet water temperature protection at COOL (Code:
AL03)
At cool mode, if ST≤AL01, all the compressors will be stopped, other parts will keep
its original state. A continuous blink warning code AL03 will appear on the LCD, until
ST≥AL01+AL02, the unit will turn to its normal work.
9.7.5 The outdoor side low outlet water temperature protection
at HEAT (Code: AL04)
When SF03=1, at heat mode working, if STO≤AL01, all the compressors will be
stopped, other parts will keep its original state. A continuous blink warning code AL04
will appear on the LCD, until STO≥AL01+AL02, the unit will turn to its normal work.
9.7.6 High outlet water temperature protection at HEAT (Code:
AL05)
At heat mode running, ST≥AL03, all the compressors will be stopped, other parts will
keep its original state. A continuous blink code AL05 will appear on the LCD, until
ST≤AL03+AL04, the unit will turn to its normal work.
9.7.7 Water flow switch protection (Code: AL17)
At normal working condition, if there is no signal from water flow switch within AL05
after starting the outdoor side water pump, a continuous blink warning code AL017 will
appear on the LCD.
During unit working, when check FS=OFF, all the compressors will be stopped, other
parts will keep its original state, a continuous blink warning code AL017 will appear on
the LCD.
9.7.8 Low evaporate temperature protection (Code: AL20)
The protection function will be valid at COOL mode as well as at HEAT mode when
SF03=1
During normal working, if ET≤AL08, all the compressors will be stopped, other parts will
keep its original state, a continuous blink warning code AL20 will appear on the LCD.
20/28
Siemens Building Technologies SIEMENS Controller HEAT PUMP controller
HVAC Products 27.11.2006
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