Dyer Manual
2
D)
For air cooled dryers, clean the air condenser as soon as it’s dirty or clogged.
E)
For optional water-cooled condensers, use only clean water and install a water filter if needed.
Use water counter flow to clean condenser if need.
F)
Check the trouble-shooting list in case of maintenance troubles.
G)
Check operating pressures, temperatures and time settings after maintenance. If operating and safety devices
function properly, the air dryer may be used.
A) Manufacturer:
B) Purpose of this dryer
1)
This refrigerated compressed air dryer has been designed to remove water vapor from industrial compressed air.
2)
This dryer has been designed for indoor operation.
3)
The minimum and maximum values stated must be observed, as well as the safety precautions described
in this manual.
C) Dryer label
The following label is affixed on the cabinet
of the refrigerant compressed air dryer.
D) Working details
1)
Refrigerant circuit:
The refrigerant circuit can be divided in 3 parts:
a)
Low pressure section with an evaporator (heat exchanger)
b)
High-pressure section including: Condenser, liquid receiver, (if installed) and the filter dryer.
c)
Control circuit including: Compressor, Expansion valve, by-pass valve (if installed),
Fan pressure switch (if installed)
2)
For water - cooled dryers:
a)
Water valve
b)
Safety high pressure switch (if installed)
3)
The Refrigerant circuit operates as follows:
a)
The compressor compresses gaseous refrigerant to a high temperature.
b)
The hot refrigerant condenses in the condenser. Being liquefied it is stored in the liquid receiver (if installed).
c)
The liquid is taken out the storage vessel and injected in the evaporator (heat exchanger) by an expansion valve.
This expansion valve is protected by a filter, which removes particles and humidity that could be in the circuit.
d)
The injected liquid fills in the refrigerant section of the air / refrigerant heat exchanger and evaporates by taking
out the calories from the compressed air. The gaseous refrigerant is sucked in the compressor and the cycle
carries on.
e)
In order to keep the evaporation pressure steady, and thus the refrigerant temperature in the heat exchanger,
a by-pass valve is injecting hot gaseous refrigerant in the circuit. On certain dryers, an automatic expansion valve
regulates this.
4)
Compressed air circuit
a)
The saturated hot compressed air flows into the Economiser where it is pre-cooled by the out flowing dry chilled
air. In the cold zone of the air refrigerant section it continues to cool
2. INTRODUCTION TO THE DRYER