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USER MANUAL – Release 1.2 of 01/01/2010
Page 162 of 191
Version: 02/03/2010
57.11
AIR/AIR UNIT EVAPORATOR/CONDENSER AIR OUTLET LOW TEMPERATURE
IN HEATING WORKING MODE ANTI-FREEZE ALARM
Display label meaning
b1AH..b4AH
(anti-freeze alarm in circuit n° 1..4 heating working mode)
b1Ah..b4Ah
(anti-freeze alarm signal in circuit n° 1..4 heating working mode)
With alarm activated from evaporator input probe or evaporator common
output or just an anti-freeze alarm ID configured, all labels are displayed
Cause of activation
In working and in stand-by OFF remote mode id regulation probe for the Pbr
anti-freeze measures a temperature < AL41 set for at least AL44 seconds
With ID configured as anti-freeze alarm and ID active
Reset
Regulation probe for Pbr anti-freeze measures a temperature > AL41 set +
AL42 differential
With ID not active
Reset
Automatic – it becomes manual after AL45 interventions/hour (reset procedure
in functions menu)
Icon
flashing
Action
If AL46=0 only the compressors are switched off. The label alarm is signalled
by the alarm relay, buzzer and the heaters are not activated
If AL46=1 the compressors are switched off. The label alarm is signalled and
the alarm relay + buzzer are activated. If the anti-freeze alarm comes from ID
the anti-freeze heaters are also activated
Regulators
Alarm
If AL46 = 1 Relay + buzzer act anti-freeze heaters
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
Idle running valve
It follows its regulation
Supply ventilation
If air/air unit off
Condensation ventilation
It follows its regulation
Support/boiler/anti-freeze
If air/air unit off otherwise follows its regulation
Support/boiler/anti-freeze
With ID alarm activated
Pump/and water evaporator
and condenser
It follows its regulation
Compressors
Off
Pump down solenoid valve off
WARNING
Par. AL43 anti-freeze alarm delay (air/air unit low outlet air temperature) on unit start-up in heating working
mode.
If in stand-by/OFF remote working, the unit has an anti-freeze alarm and the time set in the Par. AL43 is
different to zero; by selecting working in heating mode from the key or digital input the anti-freeze situation is
reset and the compressors can be switched-on for the time set in the Par. AL35 as the unit heats the water
or the air. On expiry of the AL43 delay time, if the Pbr anti-freeze regulation probe still measures a
temperature < AL41 set for at least AL44 seconds, the unit is blocked and an anti-freeze alarm is generated.
