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8. Maintenance
8.1 Electric box
a) General notes :
The electric box of the 30AJ units were designed in order
to make the inspection and maintenance services easier.
All the control, start-up and protection devices are located
there. Exist two terminals block to control and power wire.
In the terminal block also be includ the ground terminal.
b) Pressure switch:
The pressure switch in the machines 30AJ are the individual
type both sides(High and Low). Both are rearm automatic
and of the side high it the type miniature connected in the
discharge line. Independent of it rearms to be automatic
or manual when disarming the machine is blocked for the
module. The valves of disarm these pressure switch are
indicated in the table of general characteristics.
A time verifi ed and cured the cause of disarms it, reseting
can to be made disconnect and restarting the unit in the
panel of control or through the restoration of power to
the command.
d) Protection of the compressors:
- Compressors 220 and 380V - Line break (intern)
The “line break” is a protection dispositive against overload
and superheating of the engine from the compressor that
is installed inside (in the stator of motor). It directly acts in
the circuit of engine force, rearming automatically with the
decrease of the temperature, however the compressor will
remain off due action of the device anti-recycle. It rearms it
can be made through the key ON/OFF from the unit.
8.2 Eventual failures
Problem
Probable Cause
Procedure
1. Unit does not start up.
Phases R, S, T are not in the correct sequence.
•
Revert the power supply
cables in the connection.
Lack of power supply.
•
Check power supply.
•
Check fuses, circuit
breakers and switches.
•
Check electrical contacts.
Inadequate voltage or out of the allowed limits.
•
Check and correct.
Burnt control fuses.
•
Check control short circuit,
wrong connection or faulty
items. Fix and replace fuses.
Protection devices opened.
•
Check pressostats, fl ow switches,
relays and auxiliary contacts.
Faulty contactor, motor or compressor.
•
Test and replace.
2. Condenser fan does not run.
Defective overload relay or contactor.
•
Test and replace.
Defective motor.
•
Test and replace.
Bad contact in the electrical connections.
•
Check and tighten.
3. Compressor ‘’roars” but does not
start up.
Low voltage.
•
Check and tighten.
Faulty compressor motor.
•
Replace compressor.
“Locked” compressor.
•
Check and replace compressor.
4. Compressor starts up, but does not
run continuously.
Defective compressor or contactors.
•
Test and replace.
Lack of refrigerant
•
Check and correct loss.
•
Add refrigerant if necessary.
Insuffi cient thermal load.
Compressor motor overload or overheating.
•
Check design conditions.
•
Check protection device
operation. Replace if necessary.
•
Check voltage or phase
imbalance. Correct the problem.
• Check
expansion
valve adjustments.
•
Check temperature (or pressure)
at suction and at condensation.
Содержание 30AJ
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