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VARISTAR LHX 20

Maintenance and Repair

Cooling module 60714-050

www.schroff.biz

26

R2.1, May 10, 2012

7.4 Component replacement

7.4.1 Removing and fitting fans

Figure 6: Removing and fitting fans

Removing and fitting fans

1 Unscrew domed nuts (see arrows).

2 Remove fan.

3 Disconnect electrical connector (1).

4 Fit new unit following the above steps in reverse..

Attention!

Fans can be replaced while the system is in operation.



Please be aware during removal, and particularly during fitting, of the mass
moment of inertia of the rotating fan.

If the fan still does not function after replacement, check the fan fuse on the

control board. The control board is situated beneath the cover on which the dis-

play is mounted. Disconnect the mains supply before removing the cover.

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Summary of Contents for 60714-050

Page 1: ...VARISTAR LHX 20 User s Manual Product Number 60714 050 Revision R2 1 May 10 2012 Doc No 60130 531...

Page 2: ...not accept any liability for errors or misprints The company reserves the right to amendments of technical specifications due to further development and improvement of products Copyright 2012 All righ...

Page 3: ...ating the cooling module 8 3 1 Control and display unit 8 3 2 Setting the air exit temperature 9 4 Storage and transport 10 4 1 Removing the packaging materials 10 5 Commissioning 11 5 1 Setting up th...

Page 4: ...4 4 Replacing the electric control valve actuator 29 7 4 5 Replacing the control and display unit 30 7 4 6 Replacing the temperature sensors 31 7 4 7 Replacing other components 32 8 Service 33 8 1 Se...

Page 5: ...t to modify this document including the liability disclaimer at any time without notice and accepts no liability for any consequences of such alterations 1 2 2 Safety symbols used in this manual Hazar...

Page 6: ...the Operator Commissioning maintenance and operation of the system may only be carried out by suitably trained technical personnel The nationally applicable health and safety regulations must also be...

Page 7: ...a mains supply voltage of 230 VAC 115 VAC and 48 VDC versions are available on request The supply voltage is converted to 48 VDC by an adaptor to power the control electronics and the fans Since the...

Page 8: ...s 9 Condensation vessel 2 Display and control unit 10 Control valve with servo actuator 3 Control system 11 AC adaptor 4 Mains input IEC320 C14 5 Cooling water inlet and return and condensate drain 6...

Page 9: ...the cabinet and into an air water heat exchanger The air is cooled here and then blown into the front area of the cabinet Inside the air water heat exchanger the heat energy of the warm air is transfe...

Page 10: ...erature gradation is obtained The temperature difference may thus be reduced and the efficiency of the cooling system increased Air loop components Air water heat exchanger Droplet separator Fans Air...

Page 11: ...rculation in the cabinet Should the air exit temperature exceed 26 C factory setting the unit switches to maximum cooling capacity the control valve is opened to 100 and the fans are driven at 100 nom...

Page 12: ...ter DOWN button Pressing this button reduces the value of a parameter If an alarm has been activated this button switches off the buzzer function horn SET button Pressing the SET button during normal...

Page 13: ...nd hold the SET button The current set value of the air exit temperature is displayed 2 While holding down the SET button use the UP or DOWN button to obtain the desired new set value 3 Release the SE...

Page 14: ...ARISTAR LHX 20 is delivered on a special pallet After unpacking check the cabinet and cooling module for any damage caused during transport or otherwise Danger of tipping over The asymmetrical positio...

Page 15: ...pletion maintenance and repair of VARISTAR cabinets may only be carried out by suitably trained technical personnel During all such operations the nationally applicable health and safety regulations m...

Page 16: ...ved for any adverse reaction in order to avoid corrosion damage During construction of the external pipe circuitry care should be taken to pre vent contaminants entering the system the pipes should be...

Page 17: ...7 5 8 5 pH value at 20 C Chloride 200 g m Total hardness 3 dH 8 dH Colony forming units 10 000 CFU ml Appearance clear without sediment Colour colourless Attention To prevent electrochemical corrosio...

Page 18: ...sult the drawing provided in the Appendix of this manual for the nominal pipe diameters and position of the connections in the cabinet Connect the water inlet 2 water return 1 and condensate drain 3 t...

Page 19: ...igned for a 230 VAC mains supply The control electronics and fans however operate from a 48 VDC supply The 230 VAC version is fitted with a 230 VAC mains adaptor which is positioned in the cooling mod...

Page 20: ...valve must be open The control valve is driven by a servo actuator and opened and closed by the control electronics according to the demand for cooling The control valve is only open when the supply...

Page 21: ...frigeration engineer plumber open the water inlet to the cabinets If present open the stopcocks in the false floor in front of the cabinets Note Where more than one cabinet is present carry out steps...

Page 22: ...not be resolved in any other way b The temperature display vacillates in the first hour between 18 C and 25 C No action required the system will stabilise by itself c Should error messages F18 or F21...

Page 23: ...bridged remote control on off E12 pin 11 pin 24 Digital input when bridged request max cooling output E13 pin 13 pin 25 Digital input reserve K4 pin 1 pin 14 Relay output 1 A 60 V closes when power a...

Page 24: ...l board Both sockets are RS 485 interfaces interface drivers are not galvanically isolated One socket is located beside the control and display unit An external control and display unit may be connect...

Page 25: ...nally applicable health and safety regulations must be adhered to ServicePLUS Where a maintenance contract has been agreed all maintenance shall be carried out exclusively by Schroff Service Please as...

Page 26: ...ly error 1 Acknowledge with the DOWN button if parameterised to hand reset Check power supply optional 48 V version only F15 Battery version power supply error 2 Acknowledge with the DOWN button if pa...

Page 27: ...sidual cooling water Attention Under no circumstances should the cooling module be stored and transported in contact with water After removal the module should be laid on its side so that any remainin...

Page 28: ...d 1 Open the rear of the cabinet and unscrew the bolts see arrows on the angle brackets 2 Open the front of the cabinet and unscrew the bolts see arrows on the retaining plate 3 Remove air deflector f...

Page 29: ...e heat exchanger 10 Switch off pump and open bleeder valve on the heat exchanger If the pump is fitted with a non return valve it should be replaced with a hose 11 If required further residual water c...

Page 30: ...lectrical connector 1 4 Fit new unit following the above steps in reverse Attention Fans can be replaced while the system is in operation Please be aware during removal and particularly during fitting...

Page 31: ...off To remove the unit switch off the cooling module or isolate the mains supply Removing and fitting the fan unit 1 Switch off cooling module or isolate mains supply 2 Remove air deflector 1 from cab...

Page 32: ...7 4 3 Cleaning replacing the droplet separator Removing and fitting the droplet separator 1 Remove fan unit 2 Loosen bolts see arrows on the securing plate at the top of the droplet separator until t...

Page 33: ...No manual interventions are permitted during calibration If the actuator is operated without the valve its correct functioning cannot be guaranteed After three calibration attempts the valve stem rem...

Page 34: ...y 10 2012 7 4 5 Replacing the control and display unit Figure 7 Control and display unit Removing and fitting the display unit 1 Unscrew bolts see arrows and pull the control and display unit out of t...

Page 35: ...before opening the module The cooling module contains 5 temperature sensors The temperature sensors for the air exit temperature F1 F2 are situated be tween the heat exchanger and the droplet separato...

Page 36: ...other components on site If it is not possible to bring the cooling module into operation with the steps covered in this chapter the entire module should be removed and returned to Schroff ServicePLU...

Page 37: ...quired contact your Schroff dealer or Schroff directly Where a maintenance contract has been agreed all maintenance shall be carried out exclusively by Schroff Service Please ask about our after sales...

Page 38: ...enalber Stra e 96 100 D 75334 Straubenhardt The following harmonised standards were applied EN ISO 12100 1 2 Safety of Machinery EN ISO 13857 Safety of Machinery DIN EN 60204 1 Electrical Equipment of...

Page 39: ...it 60714 065 External display 60714 069 Description Article Number Complete cooling module 20 kW 230 VAC 60714 050 Droplet separator 60714 053 Servo actuator for control valve 60714 054 Control board...

Page 40: ...capacity kW max 20 Cooling medium water Water flow volume m h max 2 8 Pressure loss in device measured at 1 55 m h bar 0 5 Pressure loss in device measured at 2 8 m h bar 1 2 Max operating pressure b...

Page 41: ...ix 10 1 Cooling capacity Maximum permissible differential pressure at the water control valve 2 bar Control range of the water valve Fan speed constant at 80 Water control valve 100 open at 2 8 m h Fa...

Page 42: ...VARISTAR LHX 20 Appendix Cooling module 60714 050 www schroff biz 38 R2 1 May 10 2012 10 2 Connectors interfaces on the control board...

Page 43: ...VARISTAR LHX 20 Appendix Cooling module 60714 050 www schroff biz 39 R2 1 May 10 2012 10 3 AC power supply diagram...

Page 44: ...VARISTAR LHX 20 Appendix Cooling module 60714 050 www schroff biz 40 R2 1 May 10 2012 10 4 Temperature sensor connections...

Page 45: ...VARISTAR LHX 20 Appendix Cooling module 60714 050 www schroff biz 41 R2 1 May 10 2012 10 5 Fan and control valve connections...

Page 46: ...VARISTAR LHX 20 Appendix Cooling module 60714 050 www schroff biz 42 R2 1 May 10 2012 10 6 Display connection connectors on the control board...

Page 47: ...VARISTAR LHX 20 Appendix Cooling module 60714 050 www schroff biz 43 R2 1 May 10 2012 10 7 Dimensions...

Page 48: ...VARISTAR LHX 20 Appendix Cooling module 60714 050 www schroff biz 44 R2 1 May 10 2012 10 8 LHX 20 base plate View of base plate from above A front B rear...

Page 49: ...lves C and D open Valves A to D are motorised valves with end position switches 1 Control valve volume flow 0 100 5 Pressure regulator adjust to system pressure 2 Circulation pump differential pressur...

Page 50: ...VARISTAR LHX 20 Appendix Cooling module 60714 050 www schroff biz 46 R2 1 May 10 2012 10 10 Piping and instrumentation diagram 1 Bypass is sealed sealed by default...

Page 51: ......

Page 52: ...SCHROFF GMBH www schroff biz Langenalberstr 96 100 Tel 49 0 7082 794 0 Fax 49 0 7082 794 200 D 75334 Straubenhardt...

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