Bitzer 4TFY Instruções de manutenção - Página 6

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Possible reasons
Safety cut-out
Compressor cuts out due to LP/HP pressure switch or discharge gas temperature protection
suction pressure too low
– faulty TX valve function
– insufficient refrigerant
– insufficient evaporator capacity
– evaporator filled/coated with excessive oil
– Suction filter blocked or throttling in suction
shut-off valve, liquid or suction line
suction / condensing pressure too high
– insufficient condenser capacity
– too much refrigerant
– foreign gas
– discharge shut-off valve throttled
discharge gas / oil temperature too high
– insufficient refrigerant
– by-pass between high and low pressure
– inert gas
defective / leaking working valves
– valve / gasket bridge broken
– contamination (oil coke / foreign particles)
leaking cylinder head gasket
Insufficient capacity
Compressor provides too little refrigeration capacity
suction pressure too low
insufficient pressure generation
– defective / leaking working valves
– worn piston rings / cylinder liners
– leaking cylinder head gasket
– by-pass between high and low pressure
– capacity control sticking
abnormal operating conditions
– too low / too high superheat
– application limits exceeded
– inert gas
– too much / too little refrigerant
– too much oil
Measures, recommendations
«
check function and superheat setting
«
check system for leaks, charge to minimum level
«
clean, if iced-up cure the cause, check fan
«
reduce oil charge
«
cure cause, possibly change filter
«
clean, check fan
«
reduce to minimum level
«
purge
«
open fully
(discharge gas: max. 120°C on outside of discharge line,
oil: max. 80°C outside on crankcase (paint removed))
«
check system for leaks, charge to minimum level
«
check / exchange relief valve, check plant
«
purge
«
repair, cure cause (valve breakage mainly caused by
liquid slugging due to excessive refrigerant, too much oil
or faulty TX valve regulation; with discharge valve breakage
danger of damage to connecting rod bearing)
«
clean / exchange, cure cause (oil coke mainly due to
excessive operating temperature or inert gas)
«
exchange (do not oil asbestos free gaskets!)
«
see "safety cut-out"
«
see "safety cut-out"
«
exchange of connecting rods/pistons and liners
«
exchange (do not oil asbestos free gaskets!)
«
check / exchange internal relief valve, check plant
«
repair / exchange
«
see "safety cut-out"
«
see "safety cut-out"
«
purge
«
charge / reduce to minimum level
«
reduce quantity of oil