CLIMAVENETA accurate ax Installation - User - Maintenance Manual page 68

FAULT
HEATER SAFETY
THERMOSTAT
ACTIVATED
HIGH COMPRESSOR
DISCHARGE
PRESSURE
HIGH PRESSURE
SWITCH ACTIVATED
(high compressor
discharge pressure)
68 EN
CAUSE
Insufficient air flow-rate
Thermostat connection wire cut or broken
Faulty thermostat
A) Air or incondensable gas in the refrigerant
circuit, seen by the presence of bubbles, despite
measuring a high subcooling.
B) Insufficient air flow-rate to the remote heat
exchanger or air too hot
Insufficient water flow-rate to the condenser
or water too hot.
Excessive refrigerant charge; condenser
partially flooded. Excessive subcooling of the
liquid at the condenser outlet.
Valves on the high pressure side of the circuit
partially closed.
The condensing pressure control system
isn't working.
The system is affected by an excessive
discharge pressure
SOLUTION
See "LOW OR NO AIR FLOW".
Check the continuity of the connection from
the safety thermostat to the control system.
Replace the heater safety thermostat.
Empty and recharge the circuit.
Check the operation and the correct direction
of rotation of the fans on the outdoor heat
exchanger.
Check that the exchanger is not dirty and
remove any material that may be blocking it
(leaves, paper, seeds, dust, etc.) with a jet of
compressed air or with a brush;
Check the outdoor unit for any obstacles to
the flow of air and any recirculation of the coo-
ling air;
Check that the temperature of the cooling air
does not exceed the design value.
Check the flow-rate, the pressure and the
temperature of the cooling water in the clo-
sed circuit;
Check the calibration and the operation of the
pressure control valve.
Remove refrigerant from the circuit.
Check the opening of the valves.
Check the operation of the condenser fans
and the corresponding protection device;
repair or replace the faulty fans;
Check the calibration and the operation of the
remote condenser fan pressure switch or the
speed controller.
(See CONTROLLING THE CONDENSING
PRESSURE)
See "HIGH COMPRESSOR DISCHARGE
PRESSURE".
ACCURATE AX - AW - AD - AT - AF