Friedrich H)A09K25 Manual De Usuario

18

Compressor amps will be near normal or higher. 
Noncondensables can also cause these symptoms. To 
confi rm, remove some of the charge, if conditions improve, 
system may be overcharged. If conditions don’t improve, 
Noncondensables are indicated.

Whenever an overcharged system is indi cated, always 
make sure that the problem is not caused by air fl ow 
problems. Improper air fl ow over the evaporator coil may 
indicate some of the same symptoms as an overcharged 
system.

An over charge can cause the compressor to fail, since it 
would be "slugged" with liquid refrigerant.

The charge for any system is critical. When the compressor 
is noisy, suspect an overcharge, when you are sure that 
the air quantity over the evaporator coil is correct. Icing 

A quick check for either condition begins at the evaporator. 
With a partial restriction, there may be gurgling sounds 
at the metering device entrance to the evaporator. The 
evaporator in a partial restriction could be partially frosted 
or have an ice ball close to the entrance of the metering 
device. Frost may continue on the suction line back to the 
compressor.

Often a partial restriction of any type can be found by feel, 
as there is a temperature difference from one side of the 
restriction to the other.

With a complete restriction, there will be no sound at the 
metering device entrance. An amperage check of the 
compressor with a partial restriction may show normal 
current when compared to the unit specifi cation. With a 
complete restriction the current drawn may be considerably 
less than normal, as the compressor is running in a deep 
vacuum (no load.) Much of the area of the condenser will 
be relatively cool since most or all of the liquid refrigerant 
will be stored there.

The following conditions are based primar ily on a system 
in the cooling mode.

A partial restriction allows some of the refrigerant to 
circulate through the system. 

With a complete restriction there is no circulation of 
refrigerant in the system.

Restricted refrigerant systems display the same symptoms as 
a "low-charge condition." When the unit is shut off, the gauges 
may equal ize very slowly. Gauges connected to a completely 
re stricted system will run in a deep vacuum.  When the unit 
is shut off, the gauges will not equalize at all.

of the evapora tor will not be encountered because the 
refriger ant will boil later if at all. Gauges connected to 
system will usually have higher head pressure (depending 
upon amount of overcharge). Suction pressure should be 
slightly higher.