Parker 250, User Manual

  250            

2

English

2 Introduction

Th

  is manual refers to refrigeration dryers designed to guarantee high 

quality in the treatment of compressed air.

2.1 Transport

Th

  e packed unit must:

• remain upright;
•  be protected against atmospheric agents;
•  be protected against impacts.

2.2 Handling

Use a fork-lift  truck suitable for the weight to be lift ed, avoiding any type 
of impact. 

2.3 Inspection

•  All the units are assembled, wired, charged with refrigerant and oil 
and tested under standard operating conditions in the factory;
•  on receiving the machine check its condition: immediately notify 
the transport company in case of any damage;
•  unpack the unit as close as possible to the place of installation. 

2.4 Storage

If several units have to stacked, follow the notes given on the packing. 
Keep the unit packed in a clean place protected from damp and bad 
weather.

3 Installation

For the correct application of the warranty terms, follw the instructions 
given in the start-up report, fi ll it and send it back to Seller.

3.1 Procedures

Install the dryer inside, in a clean area protected from direct atmospher-
ic agents (including sunlight).
In places with fi re hazard, provide for a suitable fi re-extinguishing sys-
tem.

Y

 Comply with the instructions given in par. 8.2 and 8.3.

 All dryers must be fi tted with adequate pre-fi ltration near the dryer air 
inlet. Seller is excluded any obligation of compensation or refund for any 
direct or indirect damage caused by its absence

Y

 Pre-fi lter element (for 3 micron fi ltration or better) must be replaced 

at least once a year, or sooner as per manufacturer recommendations.

Y

 Correctly connect the dryer to the compressed air inlet/outlet con-

nections,

3.2 Operating 

space

Y

Leave a space of 60 inches (1.5 m) around the unit.Leave a space 

of 80 inches (2 m) above dryer models with vertical condensation air 
expulsion.

3.3 Versions

Air-cooled version (Ac)

Do not create cooling air recirculation situations. Do not obstruct the 
ventilation grilles.

3.4 Tips

To prevent damage to the internal parts of the dryer and air compres-
sor, avoid installations where the surrounding air contains solid and/or 
gaseous pollutants (e.g. sulphur, ammonia, chlorine and installations in 
marine environments).
Th

  e ducting of extracted air is not recommended for versions with axial 

fans.

3.5 Electrical 

connection

Use approved cable in conformity with the local laws and regulations 
(for minimum cable section, see par. 8.3). Use  copper conductors only, 
rated for a temèerature of a least 140°F(60°C).
Connect the 3 cable phases to terminals L1-L2-L3 of the disconnecting 
switch and the ground wire to the green screw or bolt identifi ed by the 
label “GR”.
Install a diff erential thermal magnetic circuit breaker with contact open-
ing distance  3 mm ahead of the system (IDn = 0.3A) (see the relevant 
current local regulations).
Th

  e nominal current In of the magnetic circuit breaker must be equal to 

the FLA with an intervention curve type D.

3.6 

Condensate drain connection

Y

Make the connection to the draining system, avoiding connection 

in a closed circuit shared by other pressurized discharge lines. Check the 
correct fl ow of condensate discharges. Dispose of all the condensate in 
conformity with current local environmental regulations.

4 Commissioning

4.1 Preliminary 

checks

Before commissioning the dryer, make sure: 

•  installation was carried out according that given in the section 8.2;
•  the air inlet valves are closed and that there is no air fl ow through 
the dryer;
•  the power supply is correct.

4.2 Starting

•  Start the dryer before the air compressor;

•  switch the power on by turning the MAIN SWITCH 

&

 to “I ON”: 

the POWER LED (2) lights up turning yellow.

• press 

x

: the POWER LED (2) turns green and the compressor 

switches on; the dew point is displayed.

Y 

Phases Monitor

If appears to display the alarm “CP “, during the start up of the dryer, the 
user must verify the  wiring of the input terminals of the  disconnecting 
switch of the dryer.

 Y 

Fans(

Ac

 version): if connected with the wrong phase sequence they 

turn in the opposite direction, with the risk of being damaged (in this 
case the air exits the dryer cabinet from the condenser grilles instead 
from the fan grille - see par. 8.6 and 8.7 for correct air fl ow); immediately 
invert two phases.

4.3 Operation

•  Leave the dryer on during the entire period the air compressor is 
working;
• Th

  e dryer operates in automatic mode, therefore fi eld settings are 

not required;
•  In the event of unforeseen excess air fl ows, by-pass to avoid over-
loading the dryer. 
•  Avoid air inlet temperature fl uctuations.

4.4 Stop

•  Stop the dryer 2 minutes aft er the air compressor stops or in any 
case aft er interruption of the air fl ow;
•  Make sure compressed air does not enter the dryer when the dryer 
is disconnected or if an alarm occurs.

• press 

x

 : the POWER LED (2) turns yellow again;

•  Turn the MAIN SWITCH 

&

  to “O OFF” to switch the power off .