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Concise summary of the dryer's function, removing moisture by cooling compressed air.
Explains the path of compressed air through the dryer, including cooling and condensate separation.
Details the refrigerant flow and components within the dryer, from compressor to evaporator.
Describes how the dryer's pressure and operation are regulated automatically using switches and valves.
Overview of the electrical components, wiring diagrams, and power supply requirements for the dryers.
Provides physical dimensions, connection points, and weight for various dryer models.
Suggests a typical installation layout including prefilters, air receivers, and drain connections.
Details the procedures and considerations for physically installing the dryer, including location and connections.
Explains the meaning of various symbols and pictographs used on the dryer control panel and body.
Lists essential safety rules and precautions for operating the dryer safely.
Advises on considerations and potential adjustments for operating the dryer at high altitudes.
Step-by-step guide for the initial startup procedure, including pre-heating and connections.
Instructions for starting the dryer, including pre-heating, valve operation, and waiting periods.
Describes regular checks, monitoring of indicators, and manual draining during normal dryer operation.
Provides instructions on how to safely stop the dryer and the status of indicator lamps.
Critical safety measures for handling refrigerants and performing maintenance to avoid injury.
Lists common causes and solutions for a high pressure dewpoint, such as high inlet temperature or low airflow.
Outlines checks and actions for incorrect condenser pressure, including fan/motor issues or cleaning.
Troubleshooting steps for issues with the compressor starting or stopping, checking power and thermal protection.
Addresses problems with the automatic condensate drain system, often due to clogging.
Identifies potential causes for continuous air and water discharge from the condensate trap, indicating a system issue.
Solutions for issues related to evaporator pressure during partial load, involving by-pass valves or refrigerant levels.
Specifies the operating limits and nominal conditions such as pressure, temperature, and dewpoint.
Provides technical specifications like volume flow, power input, and refrigerant charge for specific dryer models.
Lists technical specifications including volume flow, power input, and refrigerant charge for specific dryer models.
Concise summary of the dryer's function, removing moisture by cooling compressed air.
Explains the path of compressed air through the dryer, including cooling and condensate separation.
Details the refrigerant flow and components within the dryer, from compressor to evaporator.
Describes how the dryer's pressure and operation are regulated automatically using switches and valves.
Overview of the electrical components, wiring diagrams, and power supply requirements for the dryers.
Provides physical dimensions, connection points, and weight for various dryer models.
Suggests a typical installation layout including prefilters, air receivers, and drain connections.
Details the procedures and considerations for physically installing the dryer, including location and connections.
Explains the meaning of various symbols and pictographs used on the dryer control panel and body.
Lists essential safety rules and precautions for operating the dryer safely.
Advises on considerations and potential adjustments for operating the dryer at high altitudes.
Step-by-step guide for the initial startup procedure, including pre-heating and connections.
Instructions for starting the dryer, including pre-heating, valve operation, and waiting periods.
Describes regular checks, monitoring of indicators, and manual draining during normal dryer operation.
Provides instructions on how to safely stop the dryer and the status of indicator lamps.
Critical safety measures for handling refrigerants and performing maintenance to avoid injury.
Lists common causes and solutions for a high pressure dewpoint, such as high inlet temperature or low airflow.
Outlines checks and actions for incorrect condenser pressure, including fan/motor issues or cleaning.
Troubleshooting steps for issues with the compressor starting or stopping, checking power and thermal protection.
Addresses problems with the automatic condensate drain system, often due to clogging.
Identifies potential causes for continuous air and water discharge from the condensate trap, indicating a system issue.
Solutions for issues related to evaporator pressure during partial load, involving by-pass valves or refrigerant levels.
Specifies the operating limits and nominal conditions such as pressure, temperature, and dewpoint.
Provides technical specifications like volume flow, power input, and refrigerant charge for specific dryer models.
Lists technical specifications including volume flow, power input, and refrigerant charge for specific dryer models.
This document is an instruction book for Atlas Copco FD90, FD110, FD130, FD170, and FD230 air dryers. It provides comprehensive information on the device's function, technical specifications, usage, and maintenance.
The Atlas Copco FD air dryers are designed to remove moisture from compressed air by cooling it to near freezing point, causing water to condense. The condensate is then automatically drained, and the dried air is warmed up before exiting the dryer.
The air circuit involves compressed air entering a heat exchanger (13) where it is pre-cooled by outgoing, cold, dried air, leading to initial water condensation. The air then flows through a heat exchanger/evaporator (11) where refrigerant evaporation further cools it to near the refrigerant's evaporating temperature, causing more water to condense. A separator (3) then removes all condensate, which collects in a condensate trap (4) and is automatically drained. The cold, dried air is finally warmed up by the incoming air in the heat exchanger (13) to approximately 10 degrees Celsius below the incoming air temperature, preventing condensation in the air net unless the air cools below the pressure dewpoint indicated by gauge (1).
The refrigeration circuit begins with the compressor (M1) delivering hot, high-pressure refrigerant gas to the condenser (9), where most of it condenses. The liquid refrigerant then passes through a liquid refrigerant dryer/filter (12) to a capillary tube (7), exiting at evaporating pressure. It enters the evaporator (11) to absorb heat from the compressed air through further evaporation at constant pressure. The heated refrigerant then returns to the compressor via an accumulator (14).
The dryer features an automatic regulation system to maintain stable operation. A fan control switch (S3) stops and starts the cooling fan to keep condenser pressure constant. If the evaporator pressure drops to 2.25 bar(e) under partial or no load, a by-pass regulator opens, feeding hot, high-pressure gas to the evaporator circuit to prevent further pressure drops.
The electrical system varies by model. FD170 60Hz and FD230 60Hz dryers are 3-phase units, while all other FD dryers are single-phase. FD170 and FD230 refrigerant compressors (M1) are equipped with a crankcase heater (Rs) that energizes when voltage is supplied, keeping the oil warm to prevent refrigerant condensation and potential compressor damage at start-up. A fan control switch (S3) manages the condenser fan motor (M2) based on condenser pressure. A high-pressure shut-down switch (S7) stops the compressor if refrigerant circuit pressure exceeds a set point and requires manual reset. Compressor motors also have built-in thermic protection, which may cause the compressor to stop and restart after up to 2 hours when windings cool down.
An optional electronic thermostat with a display (3) shows the pressure dewpoint. It allows checking and altering the set point value (L1) for the dewpoint alarm and the differential value (HY1) for alarm on/off temperature difference. An alarm indicator lamp lights up if the temperature exceeds the preset value.
Nominal Conditions (50 Hz / 60 Hz):
Limitations:
Specific Data (FD90, FD110, FD130 - 50 Hz / 60 Hz):
Specific Data (FD170, FD230 - 50 Hz / 60 Hz):
Installation:
Initial Start:
Starting:
During Operation:
Stopping:
General Maintenance:
Safety Precautions (Refrigerant R404a):
Problem Solving (Common Issues):
General| Brand | Atlas Copco |
|---|---|
| Model | FD90 |
| Category | Dryer |
| Language | English |
