Construction. The construction of the suction line filter-drier is not significantly different from the standard liquid line filter-drier.
Both driers remove important contaminants such as moisture, dirt, acid, and the products of lubricant decomposition.
What is the purpose of a suction line filter-drier?
These suction line filter-driers include
protection from moisture and organic or inorganic acids, resulting from burnouts, or chemical changes in the system refrigerant or oil
. They are specially suited for system clean-up after a burnout, or when major work has been performed on the system.
How much moisture can a filter-drier hold?
Modern zeolite molecular sieve desiccants have a capacity of approximately
16 grams of moisture per 100 grams of desiccant
. The capacity of a desiccant is temperature dependent. The colder the desiccant, the more moisture it can hold. Therefore, locating a filter-drier in a cooler location is an advantage.
What is the difference between liquid line filter-drier and suction line filter-drier?
The liquid line filter drier is often factory-installed and is installed near the expansion valve of the refrigeration unit. On the other hand, the suction line drier is often used after repair work is done after a motor blowout.
Where do you put a suction line filter drier?
Suction Line Filter-Driers and Suction Filters should be installed
as close to the compressor as possible
. If a suction vibration eliminator is used, the drier or filter should be installed upstream of it. Suction Line Filter-Driers and Suction Filters may be installed either in a horizontal or vertical position.
How do I know if my liquid line filter drier is clogged?
How can you tell if you have a clogged liquid line filter drier?
If there is a noticeable temperature drop from one side of the filter drier to the other
, this means that there is a pressure drop. Remember that temperature follows pressure and temperature is something that we can measure on the outside of the tubing.
Should suction line drier be removed?
Any pressure loss in the suction line also reduces system capacity significantly. When an RSF shell or replaceable core type Catch-All is used,
it is recommended that the cores be removed and filter elements installed when the clean-up job is complete
.
How do you use a suction filter?
How often should a filter-drier be changed?
All filter driers should be replaced
every 2 years
or by manufacturer’s recommendation. The Receiver Drier’s function in an automotive a/c system is to filter foreign material, remove moisture from refrigerant and to act as a reservoir to supply liquid refrigerant to the TX valve.
What’s inside a filter drier?
Is a filter drier necessary?
The right filter drier is essential for the cooling system to work properly
. The filter drier is one of the basic components of the cooling system being responsible to prevent impurities and/or moisture from contaminating the control element (capillary tube or expansion valve) or the compressor itself.
Can filter drier be reused?
Reactivating Filter-Driers
In the past,
some have attempted to reactivate and reuse a filter-drier by heating and evacuating the desiccant
. Heating and evacuating does actually remove much of the moisture and allow the drier to be used again.
What is the purpose of a suction line accumulator?
The Function of a Suction Line Accumulator in A Heat Pump or Refrigeration System Is
to Catch and Hold Any Unused Portion of The System Charge
. The Device Must Also Prevent Liquid Slugging of The Compressor and Excessive Refrigerant Dilution of The Compressor Oil.
How does a suction line accumulator work?
Accumulators have a metering ejector device that
picks up liquid, vaporizes it, and returns it to the compressor
. This prevents liquid slugging and controls oil return. It is particularly important on hot gas defrost systems, heat pumps, etc., where surges of liquid refrigerant frequently go back down the suction line.
Where must a suction line drier be placed in a heat pump after a motor burnout?
THE SUCTION LINE DRIER LOCATION – A filter-drier should be installed
in the suction line
to clean up a heat pump after a severe hermetic motor burnout. First, make sure the burnout is “severe” by testing the acidity of the oil from the burned out compressor using the Sporlan TA-1 Acid Test Kit.
What direction should a filter drier face?
How do you install a suction filter?
Which way does filter dryer point?
Point the arrow in the correct direction.
Suction driers point towards the compressor and away from the evaporator
. Liquid line driers point toward the metering device and away from the condenser. A liquid line drier goes in the liquid line, NOT in the discharge line.
What is a common symptom of a severely restricted filter drier?
A starved evaporator from the liquid line (filter drier) restriction will cause
high superheats
. High compression ratios from the low evaporator pressure will cause high heat of compression, thus high discharge temperatures. This is assuming there’s still some mass flow rate of refrigerant through the system.
What are the symptoms of a partially blocked filter drier?
- Higher-than-normal discharge temperature;
- High superheats;
- Low evaporator pressure;
- Low condensing pressure;
- Normal-to-a-bit-high condenser subcooling;
- Low condenser splits;
- Local cold spot or frost after the restriction;
- Low amp draw; and.
What happens when a receiver drier fails?
Moldy smell from the AC
Another symptom of a bad or failing receiver dryer is a moldy smell from the vehicle’s AC. The receiver dryer is designed to remove moisture from the system, and if it is unable to do so for any reason, this can lead to mold or mildew.
Does filter drier size matter?
For quick selection without further consideration of the drying capacity or liquid capacity,
you should always choose a slightly larger drier
. For example, the drier sizes DML 83, DML 163 and DML 303 are available with 10-mm flare connection. For a rough selection, you should always favor the 163 or 303 size.
How can you tell when a filter drier is stopped up quizlet?
How can you tell when a filter dryer is stopped up?
It will have a pressure drop of more than 2 psi across the filter
.
What is the range of suction filters?
Suction strainers are normally available with openings ranging from
75 to 150 microns
. Some manufacturers offer inlet filters with ratings as low as 25 microns. These low-micron elements have large filtering surfaces.
Is suction filtration the same as vacuum filtration?
Suction filtration (also called vacuum filtration
) is a technique used to separate liquids from solids.
What is the purpose of a trap in vacuum filtration?
A trap is placed between the vacuum apparatus and the side-arm receiving flask
to prevent contamination of the filtrate and/or prevent the filtrate from reaching the vacuum apparatus
.
