Rivacold BLOCKSYSTEM FA - Page 31

BLOCKSYSTEM FA - FT Pag. 31 REV. 04 10/07
UK
C
The compressor starts but the relay does not open
1 Electrical connections incorrect.
2 Low voltage at compressor.
3 Relay locked closed.
4 Excessive discharge pressure.
5 Electric motor – winding interrupted or in short
circuit.
1 Check the electric circuit.
2 Find and remove the cause.
3 Find and remove the cause.
4 Find the cause and replace the relay if
necessary.
5 Replace the compressor.
D
Thermal circuit breaker intervention
1 Low voltage at compressor (three-phase motor –
phase imbalance).
2 Thermal circuit breaker faulty.
3 Faulty run capacitor.
4 Excessive discharge pressure.
5 High suction pressure.
6 Compressor overheated - hot return gas.
7 Electric motor – winding interrupted or in short
circuit.
1 Find and remove the cause.
2 Check characteristics and replace if
necessary.
3 Find and remove the cause.
4 Check the ventilation and any restrictions
or obstructions in the system circuit.
5 Check the sizing of the system. Replace
the condensing unit with a more
powerful one if necessary.
6 Check the refrigerant charge; repair any
leaks and add gas if necessary.
7 Replace the compressor.
E
The compressor starts and runs at brief operating
cycles
1 Thermal circuit breaker.
2 Thermostat.
3 High-pressure switch intervention due to
insufficient condenser cooling.
4 High-pressure switch intervention due to excess
refrigerant gas charge.
5 Low-pressure switch intervention due to
insufficient refrigerant gas charge.
6 Low-pressure switch intervention due to
expansion valve restriction or blockage.
1 See the previous point (thermal circuit
breaker intervention).
2 Small differential: correct adjustment.
3 Check the correct operation of the fan
motor or clean the condenser.
4 Reduce the refrigerant charge.
5 Repair any leaks and add refrigerant gas
if necessary.
6 Replace the expansion valve.
F
The compressor runs continuously or for long periods
1 Insufficient refrigerant gas charge.
2 Thermostat contacts blocked in the closed
position.
3 System insufficiently sized for the charge.
4 Excess charge to be cooled or insufficient
insulation.
5 Evaporator covered with ice.
6 System circuit restriction.
7 Condenser blocked.
1 Repair any leaks and add refrigerant gas.
2 Replace the thermostat.
3 Replace the system with a more powerful
one.
4 Reduce the charge or improve the
insulation, if possible.
5 Defrost.
6 Identify the cause and remove it.
7 Clean the condenser.
G
Run capacitor damaged, interrupted or short circuited
1 Incorrect run capacitor
1 Replace with a capacitor of the correct
type.
H
Starter relay faulty or burnt out
1 Incorrect relay.
2 Relay fitted in incorrect position.
3 Incorrect run capacitor
1 Replace with a relay of the correct type.
2 Fit the relay in the correct position.
3 Replace with a capacitor of the correct
type.