Product Manual
Table Of Contents
- Table of contents
- 1 Safety precautions
- 2 General description
- 3 Controller
- 3.1 General
- 3.2 Control panel
- 3.3 Icons used
- 3.4 Main screen
- 3.5 Calling up menus
- 3.6 Shutdown warning
- 3.7 Shutdown
- 3.8 Inputs menu
- 3.9 Outputs menu
- 3.10 Counters
- 3.11 Control mode selection
- 3.12 Service menu
- 3.13 Setpoint menu
- 3.14 Event history menu
- 3.15 General settings menu
- 3.16 Info menu
- 3.17 Week timer menu
- 3.18 Test menu
- 3.19 User password menu
- 3.20 Web server
- 3.21 Programmable settings
- 4 Installation guidelines
- 5 Operating instructions
- 6 Maintenance
- 7 Adjustments and servicing procedures
- 8 Problem solving
- 9 Technical data
- 10 Guidelines for inspection
- 11 PED (Pressure Equipment Directive)
- 12 Declaration of conformity
Compressed air circuit
Compressed air enters heat exchanger (1) and is cooled by the outgoing, cold, dried air. Water in
the incoming air starts to condense. The air then flows through heat exchanger/evaporator (2)
where the refrigerant evaporates, causing the air to be cooled further to close to the evaporating
temperature of the refrigerant. More water in the air condenses. The cold air then flows through
separator (3) where all the condensate is separated from the air.
The cold, dried air flows through heat exchanger (1) where it is warmed up by the incoming air.
The condensate is automatically drained by the electronic condensate drain (9).
Refrigerant circuit
Compressor (4) delivers hot, high-pressure refrigerant gas which flows through condenser (6)
where most of the refrigerant condenses.
The liquid flows through liquid refrigerant dryer/filter (7) to capillary tube (8). The refrigerant
leaves the capillary tube at evaporating pressure.
The refrigerant enters evaporator (2) where it withdraws heat from the compressed air by further
evaporation at constant pressure. The heated refrigerant leaves the evaporator and is sucked in
by the compressor.
The condenser (6) pressure must be kept as constant as possible to obtain stable operation. Fan
control switch (P) therefore stops and starts the condenser cooling fan. If, under partial or no
load, the evaporator (2) pressure drops to approximately 2.25 bar(e) (32.63 psig), the hot gas
bypass valve (5) opens and hot, high-pressure gas is fed to the evaporator circuit to prevent the
evaporator pressure from dropping any further.
Automatic drain
The dryers are equipped with an electronic condensate drain (EWD). The condensate from the
condensate trap accumulates in a collector. When the condensate reaches a certain level, it is
discharged through the drain outlet (1).
The condensate can also be drained by pressing the test button (2).
The drain filter can be cleaned by opening the manual drain valve (3), see section Preventive
maintenance schedule.
Instruction book
2920 7140 42 19