Product Made In Japan
Manufacturer: KONAN ELECTRIC
Model: ARU2/ARU3A/FR21; FR21P; FR5

Model Code

Standard type 

Type mounted in the control box 

The drain discharge department have not a drain cook, and have a screw of Rc1/8

Instrumentation type 

Specifications

● Above values of mass exclude weight of mounting bracket.

Operation

Standard type 

❶ Deflector

● Turns air from the primary side into a rotating air flow and separates moisture from the air by centrifugation.

❷ Filter element 

● Finally filters out lightweight dirt and dust,foreign particles, etc.that cannot be separated from the air by certrifugation.

❸ Bowl 

● The drain separated by centrifugation runs down the internal wall of the bowl and collects at the bottom.

❹ Baffle plate

● Prevents the drain in the bowl from re-entering the air.

❺ Diaphragm chamber 

● Air pressure from the primary side enters the diaphragm chamber at the same time that it does the secondary side through the filter. The diaphragm is forced up until the pressure in the diaphragm chamber is equal to th spring force. The valve is then closed.
● As the pressure in the secondary side drops, the valve is opened and the primary-side air pressure is furnished to the secondary side again.

❻ Relief valve 

● When the handle is turned counterclockwaise to lower the set pressure, the spring force weakens compared with the pressure in the diaphragm chamber. This forces the diaphragm up and opens the relief valve,thus releasing the air pressure in the secondary side to the atmosphere until that pressure is equal to the spring force.

❼ Handle（adjusting screw） 

● To lower the set pressure,turn the handle counterclockwise.
● Turning the handle clockwise causes the adjusting screw tip to force the spring retainer down,thus compressing the spring. This opens the valve, and the air pressure entering the primary side flows to the secondary side.

❽ Side glass 

● Used to check the accumulating drain fluid quantity.

❾ Drain cock 

● Turning the handle of this cock allows the drain fluid to be discharged.

Outside Dimensions

Standard type

Instrumentation type

Type mounted in the control box

Operating Instructions

1 Installation

● Install as far from the air source as possible. For a circuit where the flow of air is reversed from the secondary to the primary side, install a check valve in parallel.
● Leave space so that the bowl can be removed to check and maintain the filter element.

● Install the unit and piping so that the drain opening is located at the bottom.

2 Lubrication
● In general,do not lubricate. When disassembling for checking, however, apply grease.

3 Discharging drain fluid

ARU2 − 02
● Push the push rod of the drain valve upwards.

Other types

● Turn the handle of the drain cock counterclockwise.The pressure in the bowl will discharge the drain.

4. Bracket
● The FR unit mounting bracket is available as an option. To install the bracket,see the figure at right.
● Remove any three machine screws from the upper part of the FR unit. Mount the bracket with the three longer machine screws supplied with the bracket.
● For the miniature type, secure the bracket using lock screw.

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