CLIMAVENETA i-ACCURATE i-AX Installation Manual - User And Maintenance page 71

FAULT
LOW COMPRESSOR
DISCHARGE
PRESSURE
HIGH COMPRESSOR
SUCTION PRESSURE
LOW COMPRESSOR
SUCTION PRESSURE
(and possible defrosting
of the coil)
LOW PRESSURE
SWITCH ACTIVATED
(low compressor suction
pressure)
i-ACCURATE i-AX - i-AW - i-AD - i-AT - i-AF
CAUSE
The condensing pressure control system
isn't working (see the control panel manual).
Excessive water flow-rate to the condenser
or water too cold.
Suction pressure too low
Thermal load higher than expected
The system is affected by an excessive
discharge pressure
Too much refrigerant in the circuit.
Return of liquid refrigerant to the
compressor intake
Room temperature too low
The air flow-rate is too low or null
Liquid receiver outlet valve not
completely open
Refrigerant filter blocked
Insufficient refrigerant charge
Thermostatic valve not correctly calibrated
or faulty
Dewatering filter cartridge dirty
The system is affected by an excessively
low discharge pressure
SOLUTION
Check the calibration and the operation of the
condenser fan pressure switch or the speed
controller;
Check the temperature of the cooling water.
Check the calibration and the operation of the
pressure control valve (if fitted).
Install a pressure control valve to manage the
flow-rate of water according to the conden-
sing pressure.
See "LOW COMPRESSOR SUCTION
PRESSURE".
Check the ambient thermal load; check, above
all for intense dehumidification, the flow-rate
and the conditions of the outside air; check
the inflow of outside air.
See "HIGH COMPRESSOR DISCHARGE
PRESSURE".
Remove refrigerant from the circuit
Check that the thermostatic valve superhea-
ting value is correct; check that the valve sen-
sor bulb is not discharged and that it is cor-
rectly positioned, secured and insulated".a
See "ROOM TEMPERATURE TOO LOW".
See "LOW OR NO AIR FLOW".
Check the opening of the valve.
Check that the thermostatic valve superhea-
ting value is correct; check that the valve sen-
sor bulb is not discharged and that it is cor-
rectly positioned, secured and insulated".
Check the liquid subcooling at the condenser
outlet; if necessary, restore the charge.
Check that the thermostatic valve superheating
value is correct (around 5°C).
Check and if necessary replace the dewatering
filter cartridge; the temperature difference
measured upstream and downstream of the
filter must be less than 2°C.
See "LOW COMPRESSOR DISCHARGE
PRESSURE".
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