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Cod. 710.0138.72.00 Rev.10 

– 02.2022 

© Copyright 2022 Gardner Denver - All rights reserved

                  

  11 

– 11

 

Pic.5 
Option: No loss condensate drain (NLD) 

 

 

 

Electronic  drain  discharge  NLD  is  the  new  discharger  applicable  to  any 
compressed  air  systems.  It  eliminates  the  condensate  without  wasting 
compressed air. 
Electronic  drain  discharge  starts  automatically,  without  the  need  of  any 
adjustment. The condensate discharge occurs to the use of an electronic sensor, 
which detects the amount of condensate in the integrated water collecting tank. 
The  level  sensor  drives  start  and  duration  of  the  drainage,  so  preventing  any 
wasting of compressed air.  
At the end of installation, put the system under pressure and push the TEST key 
repeatedly to eliminate the air bubbles contained in the discharger inlet fittings. 

 

 
 
 

 

 

  

 

 

 
If the discharger not operate correctly, try to act on the TEST key to clean the mesh filter.  
Never  remove  the  discharger  body.  If  the  malfunctioning  persist,  contact  our  Customer 
Service. 

 

Before  carrying  out  any  work  on  the  electrical  parts,  make  sure  that  the  main  switch 
interrupts the electricity supply to the dryer  and then affix appropriate warning signs to 
avoid the machine being reconnected to the electricity mains! 

 

 

 

4.3 DECOMMISSIONING 

 

 

All work on the dryer may only be carried out by specialist personnel! 
Follow this procedure if you need to shut down the dryer: 
 

 

Stop the device and permanently isolate it from the electricity mains; 

 

Disconnect the power cable; 

 

Take pressure off the air circuit; 

 

Empty the tank and the internal cooling medium circuits; 

 

If the device has to be dispatched, use the original or similar packaging and keep the device in an up-right position. 

 
Before carrying out any work on the electrical parts, make sure that the main switch interrupts the electricity supply to the 
dryer  and then affix appropriate warning signs to avoid the machine being reconnected to the electricity mains! 
 
Please consult the contents and the safety instructions in the relevant sections of these instructions for details of the correct 
handling  and  storage  of  the  drer.  Remove  any  residual  cooling  medium  from  the  dryer  in  a  manner  appropriate  to  its 
properties and in accordance with the legislation in force. 
 
If the device has to be demolished: Never open the sealed cooling assembly (compressor, evaporator and condenser) if 
there may be any refrigerant or lubricating oil present! 
 
Send the dryer to an approved waste disposal company in accordance with current environmental protection legislation. The 
other materials/waste constituents must be treated in line with the provisions of the valid legislation. 

 
 

Summary of Contents for GDD4F

Page 1: ...02 2022 Copyright 2022 Gardner Denver All rights reserved 1 10 DIRECT EXPANSION COMPRESSED AIR DRYERS Operators Manual GDD4F GDD7F GDD9F GDD12F GDD18F GDD24F GDD30F GDD37F GDD43F GDD50F GDD60F GDD80F...

Page 2: ......

Page 3: ...lation 4 3 START UP 3 1 Control panel 4 3 1 1 Keys function 5 3 1 2 Condensate discharge parameters programming 6 3 1 3 Anomaly warning 6 3 1 4 Remote signalling alarm 7 3 2 Before start up 7 3 3 Star...

Page 4: ...Cod 710 0138 72 00 Rev 10 12 2021 Copyright 2021 Gardner Denver All rights reserved...

Page 5: ...o the risk of electric shock Condensate drain point Rotation direction of the fan Pay particular attention to the risk of moving parts Explosion risk Lifting point Don t lift from this point Attention...

Page 6: ...re enters counterflow the initial air air exchanger and it is reheated by the inlet hot air with the consequence of energy recovering and also reduction of the relative humidity contained in the outf...

Page 7: ...attempt to lift heavy objects without proper lifting equipment i e crane hoist slings or fork truck Lifting any unit without proper lifting equipment may cause serious injury Use fork lift channels wh...

Page 8: ...isolation switch if present The control panel will show the message OFF indicating that the line and control voltages are available Start sequence The dryer will initially start by pressing and holdi...

Page 9: ...t point it increases the displayed value of one unit per second during the first 10 seconds than of one unit every 0 1 sec ON OFF Pressed it activates or deactivates the dryer When the dryer is deacti...

Page 10: ...the dryer WARNING FOR USER IT S FORBIDDEN TO ATTEMPT TO MODIFY THE OTHER CONFIGURATION PARAMETERS OF THE ELECTRONIC CONTROLLER WITHOUT AUTHORIZATION AND COLLABORATION OF Gardner Denver S AUTHORIZED DI...

Page 11: ...ng the first working hours 3 3 START UP The operations specified below must be performed after the first start up and at each start up after a prolonged inactive period of time due to maintenance oper...

Page 12: ...ryer Replace elements as needed YEARLY OR EVERY 2000 HOURS OF OPERATION Check if the flexible tube used for condensate drainage is damaged and replace it if necessary Check if all connecting pipes are...

Page 13: ...essure switch Reset the high pressure switch Problems with cabling or with the electronic control board Check the cabling and the electronic control board if the trouble persists replace them Activati...

Page 14: ...xtremely delicate Do not remove the probe from its position In case of any kind of problem please contact your local Gardner Denver distributor Pic 3 drain solenoid valve When it is necessary Clean th...

Page 15: ...y mains 4 3 DECOMMISSIONING All work on the dryer may only be carried out by specialist personnel Follow this procedure if you need to shut down the dryer Stop the device and permanently isolate it fr...

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