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IOM / @DNOVA_THS-0508 

 

1 

CONTENTS 

 
 

INDEX 
 

Page 

GENERAL DESCRIPTION 

2 

 

Basic cooling circuit  

3 

 

Installation warnings 

5 

 

 

INSPECTION / TRANSPORT 

6 

 

Inspection on receipt 

6 

 

Lifting and transport 

6 

Unpacking 

6 

 
 

 

INSTALLATION 

7 

 

Positioning 

7 

 
 

 

ELECTRICAL CONNECTIONS 

12 

 
 

 

STARTING UP 

13 

 

Preliminary checks 

13 

            Starting up for the first time 

13 

            Starting operation 

15 

            Checks during operation 

15 

            Checking the refrigerant level 

15 

 

 

SETTING OPERATING PARAMETERS  

17 

 

Generalities 

17 

 

Maximum pressure switch 

17 

 

Minimum pressure switch 

17 

 
 

 

MAINTENANCE 

18 

 

Warnings 

18 

 

Generalities 

18 

 

Inspecting the air filter 

19 

 

Inspecting the damper servomotor 

19 

 

Repairing the cooling circuit 

20 

 

Tightness test 

20 

 

Hard vacuum and drying of cooling circuit 

20 

 

Recharging with R407C refrigerant 

21 

 

Environmental protection 

21 

 
 

 

TROUBLESHOOTING 
 

22 

 

 

OVERALL DIMENSIONS 

24 

 

 

TECHNICAL DATA SHEET  

25 

Summary of Contents for @DNOVA THS

Page 1: ...Providing IT Climate Technology DNOVA_THS IOM 0508 E Installation operating and maintenance DNOVA THS Telecom split unit ...

Page 2: ......

Page 3: ...3 Starting operation 15 Checks during operation 15 Checking the refrigerant level 15 SETTING OPERATING PARAMETERS 17 Generalities 17 Maximum pressure switch 17 Minimum pressure switch 17 MAINTENANCE 18 Warnings 18 Generalities 18 Inspecting the air filter 19 Inspecting the damper servomotor 19 Repairing the cooling circuit 20 Tightness test 20 Hard vacuum and drying of cooling circuit 20 Rechargin...

Page 4: ...mponents o Molecular mesh activated alumina filter dryer o Flow indicator with humidity indicator Indications are provided directly on the sight glass o Thermostatic valve with external equalization and integrated MOP function o High and low pressure switches o Schrader valves for checks and or maintenance Electric control board The electric control board is constructed and wired in accordance wit...

Page 5: ...parameters o RS232 RS485 serial output management optional o Phase sequence error Not displayed by the mP but prevents the compressor from starting up see microprocessor control manual for further details also in relation to particular customer specifications a Basic cooling circuit THI 025 035 VTE ...

Page 6: ...4 IOM DNOVA_THS 0508 THI 025 035 VTM THI 045 145 ...

Page 7: ...lectrical components may cause hazardous situations during installation and maintenance work All work on the unit must be carried out by qualified personnel only trained to do their job in accordance with current laws and regulations Failure to comply with the rules provided in this manual or any modification made to the unit without prior authorisation will result in the immediate invalidation of...

Page 8: ...n to avoid abrupt or violent manoeuvres The unit must be handled carefully and gently avoid using machine components as anchorages or holds and always keep it in an upright position The unit should be lifted using the pallet it is packed on a transpallet or similar conveyance means should be used Warning In all lifting operations make sure that the unit is securely anchored in order to prevent acc...

Page 9: ... causing back suction Positioning indoor unit Bear in mind the following aspects when choosing the best site for installing the unit and the relative connections position of the indoor unit next to the main heat source location of power supply solidity of the supporting ceiling wall It is recommended to first prepare holes in the ceiling wall for the screw anchors The dimensions and the positions ...

Page 10: ...ible ducts Option single rectangular hole with flange for 789x252 mm duct In both cases the holes in the ceiling wall have to be protected by rainproof grilles with prefilter to avoid water or foreign bodies get in the conditioner Outside air taken into the room by the fan gets out through an overpressure damper which is installed on the ceiling wall of the room and is protected also by external r...

Page 11: ...other hand the condensing unit is placed under the conditioner it is advisable to create a trap on the intake tube The recommended sizes for the power cables and emergency line are shown in the table below Models Main power supply Cable type Emergency power UPS Cable type THI025 THI035 THI045 THI056 THI073 THI090 THI105 THI120 THI145 230V 1Ph 50Hz 2 x 6 mm2 T x 6 mm2 48 Vdc 2 x 2 5 mm2 Unità model...

Page 12: ...id the original pressure is restored in the tank after a certain amount of time 2 Vacuum and charging machine 3 Vacuum cycle In general it is preferable to apply a long rather than hard vacuum reaching low pressures too abruptly may in fact cause any trapped humidity to evaporate instantaneously thereby freezing part of it The figure represents a vacuum cycle and an optimal subsequent pressure ris...

Page 13: ...f time For this reason if no machine for recovering refrigerant is available it is nonetheless advisable to switch on the crankcase heating elements and avoid applying a vacuum until the circuit has been adequately purged of refrigerant the refrigerant may in fact solubilize in the oil of the vacuum pump undermining its performance for a long time hours 5 Charging positions single point The best p...

Page 14: ...below 2 The above operating conditions must always be complied with failure to ensure said conditions will result in the immediate invalidation of the warranty The electrical connections must be made in accordance with the information shown in the wiring diagram provided with the unit and with current and local regulations An earth connection is mandatory The installer must connect the earthing wi...

Page 15: ...t of the compressors it should be warm or in any case at a temperature 10 15 C higher than the ambient temperature The diagram above illustrates a specific property of gases Charles Law which are more soluble in liquids as the pressure increases but less soluble as the temperature increases if the oil in the sump is held at a constant pressure an increase in temperature will significantly reduce t...

Page 16: ...l air T Text only Free Cooling version Compressors and fans state Counter for evaporator fans and compressors In next mask m_on_off that you can see pushing Down it is possibile to turn the unit on or off pushing Enter Down and then again Enter It is also shown if the unit is a master or a slave unit this is a fundamental information for LAN operations and configuration of local net address Unit 1...

Page 17: ... is low and needs to be topped up The presence of a few bubbles is however allowed especially in the case of high glide ternary mixtures such as HFC R407C Make sure the overheating of the cooling fluid is limited to between 5 and 8 C to this end 1 read the temperature indicated by a contact thermometer placed on the compressor intake pipe 2 read the temperature indicated on the scale of a pressure...

Page 18: ...nd this is a characteristic property of refrigerant mixtures If pure fluids are used the phase change occurs at a constant T and thus the glide is equal to zero Average T T1 T2 2 T1 start of condensation DEW POINT T2 end of condensation BUBBLE POINT Heat content h P Real P compressor outlet R407C ...

Page 19: ...al air pressure switch outlet air flow Pa 50 30 Differential air pressure switch dirty filter Pa 50 20 CONTROL DEVICE ACTIVATION DIFFERENTIAL RESETTING Maximum pressure switch Bars r 28 0 4 Manual Minimum pressure switch Bars r 2 1 5 Automatic Modulating condensation control device Bars r 14 7 Time lapse between two compressor starts s 480 b Maximum pressure swithc The high pressure switch stops t...

Page 20: ...closing the units and secure them with the fastening screws provided b Generalities To guarantee a constantly satisfactory performance over time it is advisable to carry out routine maintenance and checks as described below The indications below are related to standard tear and wear Operation Frequency Check the efficiency of all the control and safety devices Once a year Check the terminals on th...

Page 21: ...partment Pull out the air filter Check the condition of the filter and replace it if necessary d Inspecting the damper servomotor Remove the grilled panel to access the damper and air filter compartment Remove the damper fastening screws placed at the side Pull out the entire damper section to access the servomotor ...

Page 22: ...empty out the circuit before repairing the leaks with suitable alloys Do not use oxygen in the place of nitrogen as a test agent since this would cause a risk of explosion g Hard vacuum and drying of cooling circuit To achieve a hard vacuum in the cooling circuit it is necessary to use a pump capable of generating a high degree of vacuum i e 150 Pa of absolute pressure with a capacity of approxima...

Page 23: ...ee constituents Introduce refrigerant through the inlet in the liquid line A unit that was originally charged with R407C in the factory must not be charged with R22 or other refrigerants without the written authorisation of LENNOX i Environmental protection The law implementing the regulations reg EEC 2037 00 which govern the use of ozone depleting substances and greenhouse gases bans the dispersa...

Page 24: ... any alarms are signalled on the microprocessor control panel eliminate the causes and restart the unit The phase sequence is wrong Invert two phases in the primary power line after disconnecting them upstream from the unit The compressor is noisy The compressor is rotating in the wrong direction Check the phase sequence relay Invert the phases on the terminal board after disconnecting the unit an...

Page 25: ...ure drops upstream and downstream from the filter should not exceed 2 C If they do replace the filter Low condensation T Check the efficiency of the condensation control device where present Low level of refrigerant Check the refrigerant level by measuring the degree of Sub cooling if it is below 2 C replenish the charge The internal thermal protection device has tripped In the case of compressors...

Page 26: ...24 IOM DNOVA_THS 0508 9 OVERALL DIMENSIONS A B C D THI 025 145 0 200 200 200 ...

Page 27: ...n circuits 1 1 1 1 1 1 1 1 1 Fan absorbed power W 185 185 245 245 470 470 470 690 690 Evaporator air flow m3 h 950 930 1 400 1 400 2 200 2 200 2 200 3 200 3 200 Indoor coil frontal surface m2 0 16 0 16 0 29 0 29 0 29 0 29 0 29 0 37 0 37 Filter EU3 EU3 EU3 EU3 EU3 EU3 EU3 EU3 EU3 Air flow during Free Cooling m3 h 810 790 1 190 1 190 1 870 1 870 1 870 2 720 2 720 Full Free Cooling Temperature C 17 5...

Page 28: ... Rotary Scroll Scroll Scroll Scroll Scroll Scroll Number of refrigeration circuits 1 1 1 1 1 1 1 1 1 Number of compressors 1 1 1 1 1 1 1 1 1 External coil frontal surface m2 0 25 0 25 0 54 0 54 0 54 0 54 0 54 0 67 0 67 Condenser air flow m3 h 2 250 2 050 3 450 3 350 3 350 5 100 5 100 5 580 5 450 Sound power level dB A 68 68 69 69 70 70 73 71 71 Sound pressure level dB A 41 41 42 42 43 43 46 44 44 ...

Page 29: ......

Page 30: ...HS IOM 0508 E BELGIUM LUXEMBOURG CZECH REPUBLIC FRANCE GERMANY NETHERLANDS POLAND PORTUGAL RUSSIA SLOVAKIA SPAIN UKRAINE UNITED KINGDOM AND IRELAND OTHER COUNTRIES Due to Lennox s ongoing commitment to quality the Specifications Ratings and Dimensions are subject to change without notice and without incurring liability Improper installation adjustment alteration service or maintenance can cause pr...

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