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USER MANUAL – Release 1.2 of 01/01/2010
Page 156 of 191
Version: 02/03/2010
57.5
LOW PRESSURE PRESSURE SWITCH ALARM
Display label meaning
LP1…LP4
(circuit n° 1…4 low pressure pressure switch alarm)
Cause of activation
•
With circuit low pressure pressure switch active
•
If AL08=1, also with unit in stand-by or OFF remote, if circuit low pressure
pressure switch input active
•
In defrost if AL06=1 if compressor low pressure pressure switch input
active
The alarm is not signalled:
1. in defrost for time AL07 in correspondence with activation of the reverse
valve cycle
2. On compressor switch-on for the time AL01
3. AL02 = 0 the low pressure alarm is inhibited during compressor stopping in
pump down mode and with compressor at a standstill
4. AL02
!
0 the low pressure alarm is inhibited during compressor stopping in
pump down mode and with compressor at a standstill for the time set
Reset
Input deactivation
Reset
Automatic – it becomes manual after AL05 interventions/hour (reset procedure
in functions menu)
Icon
flashing
Action
Alarm relay + buzzer activated
Regulators
Alarm
Relay + buzzer activated
Reverse valve
it follows its regulation
Recovery valve
it follows its regulation
Free-cooling on/off valve
it follows its regulation
Auxiliary relay
It follows/they follow its/their regulation
0÷10V proportional output
It follows/they follow its/their regulation
Idle running valve
It follows its regulation
Supply ventilation
It follows its regulation
Condensation ventilation
Off
Support/boiler/anti-freeze
It follows its regulation
Pump/and water evaporator
and condenser
It follows its regulation
Compressors
Off
Pump down solenoid valve off
