Use and Care Manual

down to dew point and enters the separator where condensates are collected. The outgoing chilled air is then
warmed up in the economizer by the hot incoming air.
b) The condensates are collected after centrifugal separation and drained out through the automatic trap.
c) As long as the compressed air temperature does not drop below dew point, there will be no condensation
in the air circuit.
5) Refrigerant compressor
Being of the hermetic type, it requires no servicing.
6) Condenser
a) Th e air condensers are equipped with a helecoidal at the condenser refrigerant level.
On certain type of dryers, a water-cooled condenser can be fitted.
b) In this case, a water valve being driven by the refrigerant circuit is taking care of its regulation.
7) Refrigerant circuit protection
a) Klixon: The single phase compressors are equipped with a klixon which is a thermal sensitive switch
controlling the temperature of the compressor and possible over intensity.
In case of malfunction, the klixon trips but switches on again automatically as soon as the compressor has
cooled down.
b) High Pressure Security Switch: Refrigerant line is considered as a pressure vessel. That is why it is
protected against bursts by the help of manually reset switch. It is set to 362.5 psi for dryers working with
R134a
c) Filter dryer: A refrigerant circuit is a closed circuit and total water removal in the refrigerant circuit is
paramount in order to obtain a correct functioning.
d) To avoid problems, the refrigerant circuit must be vacuumed before loading the refrigerant.
It is equipped with a filter dryer, which also traps any solid particles, which may have migrated into the circuit
during assembly.
e) Water-cooled dryers have a safety high-pressure switch.
In case of cooling water failure, the safety switch stops the dryer. When the safety switch has tripped out,
it has to be manually resettled before switching on the dryer.
8) Refrigerant circuit controls
a) Liquid refrigerant injection: The liquid refrigerant is into the evaporator by a control valve. This valve is a
thermostatic or pressostatic one maintaining a constant overheats of the refrigerant in the evaporator(s).
b) Constant evaporating pressure: In the dryers equipped with a by-pass valve, the evaporating pressure is kept
constant by a controlled injection of hot gas from the high-pressure side into the low-pressure section of the circuit.
9) Condensate drain - trap assembly
Dismantling the drain is easy because it can be isolated from the air circuit under pressure with a ball valve.
The drain has to be depressurized before being dismantled.
10) Heat Exchanger Modular design
a) The dryers are equipped with a compact Mono Bloc Heat Exchanger
module. This assembly has been specially designed to dry compressed air and is
made of:
1) An Economiser which pre-cools the entering hot air with the out flowing cold air.
2) An air/refrigerant exchanger cooling down the compressed air.
3) A centrifugal separator concentrating all condensates and requiring no maintenance.
11) Accessories
a) Dew point indicator: Located on the control panel, it displays the value of the pressure dew point.
b) Temperature switch: Located inside the dryer, this temperature switch is adjustable from 32 °F up to 95 °F
c) Energy Saving Device: (ESD) This device helps dryer save energy when there is not any compressed air flow
in the dryer. (Please see the models have standart and optional in next page)
d) Filter change alarm on the front panel