Emerson Copeland Scroll YH16K1E, Инструкции по применению

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AGL_HP_ST_YHK1E_E_Rev02 31
Condition Cause Corrective action
The scroll
compressor trips
on motor
protection
High discharge
pressure /
suction
pressure
For high discharge pressure:
▪
Check for system leaks. With system leaks at the low-pressure
side, air as non-condensable gas could enter the system and
create high pressure.
▪
Check the system design. Make sure the discharge line is
correctly sized: undersized discharge line can increase
discharge pressure. This is also true for an undersized
condenser. Correct the component selection as needed.
▪
Check the fan motor, make sure it is running properly in the right
direction. Check the condenser: if dirt has been accumulated it
will clog the airflow; clean as necessary. High discharge
pressure is also caused by an overcharged system and high
ambient temperature surrounding the condenser.
For high suction pressure, check the "evaporator superheat" first to
diagnose the problem:
▪
High superheat at the evaporator outlet: this is likely in case of
excessive pressure-drop in the liquid line or too much vertical lift
on the pipe work.
▪
Low superheat at the evaporator outlet is usually the
consequence of oversized selection of the expansion valve or
incorrect bulb sensor mounting. The valve may freeze up in the
open position due to accumulation of debris in the system. For a
system with very short refrigeration lines a suction line
accumulator is recommended.
Compressor
operating
outside the
design limits
Check the compressor suction and discharge pressures while it is
running. Make sure they are within the operating envelope.
Defective motor
protector
If all operating conditions are normal, the voltage supply at the
compressor terminals is balanced and within limits, the compressor
crankcase temperature is within normal limits, and the amperage
drawn is within the specified range, the motor protector may be
defective.
Excessive
discharge
temperature Too high
compressor
superheat
Make sure the compressor operates within the acceptable
superheat range published by Emerson.
The scroll
compressor runs
continuously
Excessive
cooling /
heating load or
inadequate
insulation
Check the load design. Make sure that proper insulation is applied.
Correct it as necessary.
Control circuit
inoperative
Check the thermostat, measure the temperature of the room and
compare with the thermostat; replace or re-calibrate the thermostat.
Check the LP control switch and replace it if it is found defective.