Technical Description; Control Panel; Operation - pilotair ACT 3T User’s Maintenance & Spare Parts Manual

7 Technical description

7.1 Control panel

The control panel illustrated below is the only dryer-operator interface.
ACT 3T – 23T instrument DMC15 (standard)
ACT 3T – 23T instrument DMC14 (optional)
1
0

7.2 Operation

Operating principle - The dryer models described in this manual operate all on the same principle. The hot
moisture laden air enters an air to air heat exchanger. The air then goes through the evaporator, also known as
the air to refrigerant heat exchanger. The temperature of the air is reduced to approximately 2°C, causing water
vapor to condense to liquid. The liquid is continuously coalesced and collected in the separator for removal by
the condensate drain. The cool moisture free air then passes back through the air to air heat exchanger to be
reheated to within 8 degrees of the incoming air temperature as it exits the dryer.
Refrigerant circuit - Refrigerant gas is cycled through the compressor and exits at high pressure to a condenser
where heat is removed causing the refrigerant to condense to a high-pressure liquid state. The liquid is forced
through a capillary tube where the resulting pressure drop allows the refrigerant to boil off at a predetermined
temperature. Low-pressure liquid refrigerant enters the heat exchanger where heat from the incoming air is
transferred causing the refrigerant to boil; the resulting phase change produces a low pressure, low temperature
gas. The low-pressure gas is returned to the compressor, where it is re- compressed and begins the cycle again.
During those periods when the compressed air load is reduced the excess refrigerant is by-passed automatically
back to the compressor via the hot gas by-pass valve circuit.
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Technical Description
ACT 30T – 160T instrument DMC15 (standard)
ACT 30T – 160T instrument DMC14 (optional)
1 ON-OFF Switch
2 Electronic instrument
3 Air and refrigerant flow diagram
I
ON
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