RG66000889-REV.OO 30
Compressor overload
The alarm condition is detected independently of the status of the pump and of the compressors. The compressors are
forced into the OFF mode (previously set protection time-intervals are ignored) and at the same time the buzzer, the alarm
relay and the lighting of the display are activated.
Condenser fan overload
The alarm condition is detected independently of the status of the pump and of the compressors. The fan and the
compressor are forced into the OFF mode (previously set protection time-intervals for the compressor are ignored) and at
the same time the buzzer, the alarm relay and the lighting of the display are activated. The control of units with air-
condensation (H1=0, 1, 2 or 3), the condensation probes (/3 _0) as well as the condensation-removal fans (F1=1) must be
enabled.
Water Flow switch
The alarm condition is detected only if the pump is ON, independently of the status of the compressor. All the outputs
disenergize: pump, compressor (previously set OFF routines are ignored), condensation-removal fan) and at the same time
the buzzer, the alarm relay and the lighting of the display are activated. The control of water chillers (H1_0, 1) as well as the
water pump (H5_0) must be enabled.
Antifreeze alarm – Water outlet from evaporator
Type Delay Reset Signal
Antifreeze 1 A3 manual (automatic if P5=1) A1
Antifreeze 2 A3 manual (automatic if P5=1) A2
The alarm condition is detected only in water chillers (H1=2, 3, 4, 5, or 6) by water probes at evaporator outlet (B2 and, in
case, B4). The compressor and the condensation- fan are immediately forced into the OFF mode and at the same time the
buzzer, the alarm relay and the lighting of the display are activated.
If the temperature exceeds the set threshold, the heater turns OFF and all the other controlled devices remain OFF until the
alarm reset procedure takes place (
+ keys pressed simultaneously for 5 seconds in the panel-mounted terminal;
CLEAR key pressed for 5 seconds in the wall-mounted terminal).
The antifreeze alarm appears either when the unit is in the Cooling operating mode or in the Heating operating mode (in this
case only after the time-delay at start-up has passed). In the stand by status, "µchiller" does not detect the alarm but it
controls and manages the water heaters (optional).
In the direct-expansion units (H1=0, 1), alarm is used to detect any low ambient temperature by means of probes B1 or B2
(according to the parameter A6, support-heater control probe). The low ambient temperature alarm appears either when the
unit is in the Cooling operating mode or in the Heating operating mode (in Heating operating only if the time-delay at start-up
has passed); this alarm activates the buzzer, the alarm relay and the lighting of the display but it is not detected when the
unit is in stand-by.
Type Delay Reset Signal
Low ambient temperature A3 manual LO
5.1 Other alarms
Probe Alarms
Type Reset Signal
Probe B1 - Water temperature at evaporator input automatic
E1
Probe B2 - Water temperature at evaporator output circuit 1
automatic E2
Probe B3 - Condensation temperature/pressure circuit 1
automatic E3
Probe B4 - Water temperature at evaporator output circuit 2
automatic E4
Probe B5 - Condensation temperature/pressure circuit 2
automatic E5
They are detected also with the unit in stand-by.
As a result of a probe alarm, the compressors and the condensation fans and the pump are forced into the OFF mode.
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