MAXA i-32V5C MIDI 0121, Manual

Page: 28 / 36

Controllo per i-32V5 MIDI
Air/water inverter chillers and heat pumps with axial fans
28
23.5 [E691÷E701] TRANSDUCER ALARMS
The alarm is activated if the relevant pressure transducers are faulty or disconnected. This alarm is manual reset.
23.6 [E801] INVERTER TIMEOUT
When the on-board control does not communicate with the compressor driver board, a time-out alarm is activated to avoid losing control of
the system.
23.7 [E851 ÷E971] INVERTER ALARMS
These alarms are related to the compressor driver, each model has its own list of alarms.
23.8 [E00] REMOTE ON/OFF SIGNALLING
This message appears on the display when the remote on/off contact is open.
23.9 [E001] HIGH PRESSURE
The alarm is activated when the pressure transducer on board the machine detects a pressure higher than 41.5 bar , in which case the compres-
sor is immediately blocked. The alarm is reset automatically when the pressure drops below 32.5 bar ; if it occurs more than 3 times per hour the
alarm becomes a manual reset.
23.10 [E002] LOW PRESSURE
In chiller mode, the alarm is active if the pressure transducer on board the machine detects a pressure lower than 3.5 bar . In heat pump mode,
the alarm is active if the pressure transducer on board the machine detects a pressure of less than
1.3 bar
. Each time the compressor is activat-
ed, a bypass time of 60 seconds is counted. When the alarm is active, the circuit compressor is blocked. The alarm is automatically reset when
the pressure rises
2.0 bar
above the intervention threshold; if the number of interventions in one hour is 3, the alarm becomes manual reset.
23.11 [E008] DRIVER LIMITATION
If the compressor does not reach the speed at the expected ramp value within 30 minutes, the alarm becomes active and the compressor is
switched off for safety. If the number of alarm interventions in one hour is 3, the alarm becomes manual reset.
23.12 [E041] 4-WAY VALVE
This alarm identifies a malfunction of the 4-way valve for reversing and is manual reset. The alarm is not active for a bypass time of approximately
180 seconds from the start of the compressor.
In heating or DHW mode, after the bypass time has expired, the alarm is active when the water flow temperature is lower than the water return
temperature - 1°C.
In cooling mode, after the bypass time has elapsed, the alarm is active when the water flow temperature is higher than the water return tem-
pe 1°C.
23.13 [E042] DOMESTIC HOT WATER SANITARY
The alarm is activated during DHW production when the flow probe detects a temperature higher than H01 (default H01 = 60°C). The compres-
sor is stopped, if present, the auxiliary heating systems operate with the relative offset until the DHW setpoint detected by the DHW probe is
satisfied or the digital input disables the DHW call.
The alarm returns and the compressor restarts when the flow temperature of the heat pump detects a temperature lower than H01 - 4.0°C
(default 56°C) and the call from the temperature controller is present.
If the alarm occurs 3 consecutive times during the same DHW production phase, DHW production is inhibited and the machine returns to system
operation (if required). Once switched to the system, after a minimum waiting time of b06 seconds, it is evaluated whether to remove the inhibi-
tion (if no thermoregulation is required on the system or if it is close to the set). During the entire phase in which domestic hot water production
is inhibited, alarm E042 remains active.
23.14 LACK OF VOLTAGE
If the power supply fails, when it is restored the unit goes back to the state before the power failure.
NOTE:
•If a defrosting cycle is in progress, the procedure is cancelled.
•All the timings in progress are cancelled and reinitialised.
23.15 UTILITIES BLOCK ALARM TABLE
Alarm code DESCRIPTION Block
E00
Remote off Machine
E001
High pressure alarm Machine
E002
Low pressure alarm Machine
E005
Antifreeze alarm Machine
E006
No flow alarm Machine
E008
Compressor driver limitation alarm Machine
E009
High discharge temperature alarm Compressor
E018
High temperature in cooling mode alarm Machine
E041
Incongruent temperature alarm Machine