Installation, operating and maintenance TELECOOL

Providing indoor climate comfort

TELECOOL - THN

TELECOOL THN-IOM-0104-E

Installation, operating and maintenance

IOM / TELECOOL THN - 0104 - E Page 1

CONTENTS

GENERAL DESCRIPTION 2

BASIC COOLANT CIRCUIT ....................................................................................... 3

INSTALLATION WARNINGS ...................................................................................... 4

INSPECTION 5

TRANSPORT .............................................................................................................. 5

UNPACKING ............................................................................................................... 5

POSITIONING ............................................................................................................ 5

INSTALLATION 7

ELECTRICAL CONNECTIONS ................................................................................ 10

STARTING UP 11

PRELIMINARY CHECKS........................................................................................... 11

STARTING UP INSTRUCTIONS .............................................................................. 12

SETTING OPERATING PARAMETERS 15

GENERALITIES ........................................................................................................ 15

MAXIMUM PRESSURE SWITCH ............................................................................ 16

MINIMUM PRESSURE SWITCH.............................................................................. 16

ROUTINE MAINTENANCE AND CHECKS 17

WARNINGS .............................................................................................................. 17

GENERALITIES ........................................................................................................ 18

REPAIRING THE COOLING CIRCUIT ..................................................................... 20

TIGHTNESS TEST ................................................................................................... 21

HARD VACUUM AND DRYING OF COOLING CIRCUIT ......................................... 21

CHARGING WITH R407C REFRIGERANT ............................................................. 22

ENVIRONMENTAL PROTECTION ........................................................................... 22

TROUBLESHOOTING 23

TECHNICAL DATA 25

CONTENTS

Page 2 - IOM / TELECOOL THN - 0104 - E

GENERAL DESCRIPTION

Structure

All THN units have a galvanised sheet steel supporting base,and enclosing panels made galvanised sheet steel coated withepoxy polyester powder paint oven cured at 180°C (RALxxxx).The unit features an exclusive design which, combined with arational layout of components and extremely compactdimensions, lends it an attractive appearance.

Field of Application:

Model

Power supply

Minimum outdoortemperature TMaximum outdoortemperature TMinimum indoortemp./humidity conditionsMaximum indoor temp./humidity conditions

Storage conditions

Cooling circuit

The entire cooling circuit is built in the HiRef factory usingonly components of the finest quality brands and processesconforming to the specifications of Directive 97/23 for brazingand testing.

Compressors: only scroll-type compressors of leadinginternational manufacturers are used in the THN units.Today scroll compressors represent the best solutionin terms of reliability, efficiency and MTBF.

Cooling components:o Molecular mesh activated-alumina filter dryero Flow indicator with humidity indicator.

Indications are provided directly on the sightglass.

o Thermostatic valve with external equalizationand integrated MOP function.

o High and low pressure switcheso Schrader valves for checks and/or

maintenance

Electric control board: The electric control board isconstructed and wired in accordance with Directives73/23/EEC and 89/336/EEC and related standards.The board may be accessed through a door after themain switch has been put off. All the remote controlsuse 24 V signals powered by an insulating transformersituated on the electric control board.

NOTE: the mechanical safety devices such as the highpressure switch are of the kind that trigger directly; theirefficiency will not be affected by any faults occurring inthe microprocessor control circuit, in compliance with 97/23 PED.

Control microprocessor: the microprocessor built intothe unit allows the different operating parameters tobe controlled from a set of pushbuttons situated onthe electric control board;

o Switching on/off of compressor to maintain thetemperature set point T inside the shelter

o Alarm managementHigh / low pressureDirty filters alarmAir flow alarm

o Alarm signallingo Display of operating parameterso RS232, RS485 serial output management

(optional)o Phase sequence error [Not displayed by the

mP, but prevents the compressor from startingup]

[see microprocessor control manual for further details, alsoin relation to particular customer specifications]

GENERAL DESCRIPTION

THN “HiRef Telecom units” are air conditioners for low- andmedium-powered telephone exchanges. They are designedto be mounted inside shelter.THN air conditioners are direct expansion package units withan air-cooled condenser system. They are distinguished byan innovative air circulation system which significantlyenhances performance in all operating conditions.

THN THN THN045 056 073

230Vac+/-10%24 Vdc +/- 16% - 48 Vdc +/- 16%

- 20 °C

45 °C 45 °C 45 °C

19 °C - 30 % r.h.

35 °C - 50 % r.h.

-10 / 90 % r.h.+ 55 / 90 % r.h.

THN THN THN THN THN090 105 120 150 170

400Vac+/-10% /3/50 + N24 Vdc +/- 16% - 48 Vdc +/- 16%

- 20 °C

46 °C 45 °C 46 °C 46 °C 45 °C

19 °C - 30 % r.h.

35 °C - 50 % r.h.

-10 / 90 % r.h.+ 55 / 90 % r.h.

THN units are to be used within the operating limits stated in this manual; failure to comply with said limits willinvalidate the warranties provided in the contract of sale.


GENERAL DESCRIPTION

BASIC COOLING CIRCUIT

ENGLISH

1 COMPRESSOR2 CONDENSER3 THERMOSTATIC4 EVAPORATOR5 FILTER DRYER6 SIGHT GLASS7 LOW PRESSURE SWITCH8 HIGH PRESSURE SWITCH9 CONDENSING PRESSURE PROBE


INSTALLATION WARNINGS

GENERAL RULES

- When installing or servicing the unit, you must strictly follow the rules provided in this manual, comply with the directions onthe units themselves and take all such precautions as are necessary.

- The fluids under pressure in the cooling circuit and the presence of electrical components may cause hazardous situationsduring installation and maintenance work.

All work on the unit must be carried out by qualified personnel only, trained to do theirjob 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 willresult in the immediate invalidation of the warranty.

Warning: Before performing any kind of work on the unit, make sure it has beendisconnected from the power supply.

GENERAL DESCRIPTION


LIFTING AND TRANSPORT

While the unit is being unloaded and positioned, utmost caremust be taken to avoid abrupt or violent manoeuvres. Theunit must be handled carefully and gently; avoid usingmachine components as anchorages or holds and alwayskeep it in an upright position.The unit should be lifted using the pallet it is packed on; atranspallet or similar conveyance means should be used.

Warning: In all lifting operations make sure that the unit is securely anchored in order toprevent accidental falls or overturning.

UNPACKING

The packing must be carefully removed to avoid the risk ofdamaging the unit. Different packing materials are order tominimise their environmental impact.

POSITIONING

Bear in mind the following aspects when choosing the best sitefor installing the unit and the relative connections:

- positioning and dimensions of the coupling flanges;- location of power supply;

It is recommended to first prepare holes in the wall for theair intake and outlet flanges.The dimensions of the air outlet/intake flanges are shownbelow:

THN*D045...170 (rear view)

INSPECTION

INSPECTION

INSPECTION ON RECEIPT

On receiving the unit, check that it is perfectly intact: the unit leftthe factory in perfect conditions; immediately report any signs ofdamage to the carrier and note them on the Delivery Slip beforesigning it.HiRef S.p.A. or its Agent must be promptly notified of the entityof the damage. The Customer must submit a written reportdescribing every significant sign of damage.


THN*U045..073 – 150-170

INSPECTION

THN*U090..120 (rear view)


INSTALLATION

The THN package air-conditioning unit is suitable for allenvironments except aggressive ones. Do not place anyobstacles near the units and make sure that the air flow is notimpeded by obstacles and/or situations causing back suction.

The following steps should be carried out to ensure properinstallation:

- Apply a vibration-damping rubber lining between theunit and wall

- Position the unit on the wall, fitting the air outlet andintake flanges correctly into place

- carefully seal the entire perimeter of the unit on theinterior wall of the shelter and the air intake and outletflanges on the inside.

INSTALLATION

- In order to obtain stable indoor conditions, makesure that the shelter interior is insulated from theoutside; any openings should be sealed closed.

The recommended sizes for the power cables andemergency line are shown in the table below:

Unit model

THN045THN056THN073

THN090THN105

THN120THN150THN170

Mains power supply

230V/1Ph/50Hz

400V/3Ph+N/50Hz

Cable type

2 x 6mm2 + T 6mm2

4 x 6 mm2 +T x 6 mm2

UPS emergency line

48 Vdc/230Vac

48 Vdc/230Vac

Cable Type

2 x 2.5 mm2

2 x 4 mm2


INSTALLATION

Evacuation and charging operations for THN-type units

This type of work must be carried out by qualified personnel only trained to do their job inaccordance with current laws and regulations

1. Introduction

The simultaneous presence of liquid and vapour makes it necessary for both to be in a state of saturation [ Gibbs law ], asshown in fig. 1). In conditions of thermal equilibrium, the pressure in the tank corresponds to the T of the surrounding environment;a withdrawal of refrigerant charge will cause pressure drops, which will be associated with

- withdrawal of refrigerant charge pressure drop in tank- pressure drop in tank T drop change of state- T drop change of state evaporation of part of the liquid, causing the liquid itself to

cool- cooling of liquid thermal exchange with ambient air, further evaporation of

remaining liquid; the original pressure is restored in the tankafter a certain amount of time

Fig. 1

T tank/ambient

Saturated gas

Saturated liquid


INSTALLATION

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 causeany trapped humidity to evaporate instantaneously, thereby freezing part of it.

Fig. 3

Time

The figure represents a vacuum cycle and an optimalsubsequent pressure rise for the refrigeration devices wemanufacture.

As a rule, if there is suspicion of an extensive presence ofhumidity throughout the circuit or system as a whole, thevacuum must be “broken” with anhydrous nitrogen and thenthe steps must be repeated as described; this operationfacilitates the removal of trapped and/or frozen humidity duringthe evacuation process.

4. Evacuating a circuit “contaminated” with refrigerant

The first step is to remove the refrigerant from the circuit usinga specific machine with a dry compressor for recovering therefrigerant.

Refrigerants all tend to dissolve in oil [compressor sump] inpercentages that are directly proportional to increases inpressure and decreases in the T of the oil itself - Charles’Law -

Pressure

Oil T T 3

T 2

T 1

% R... in oil

The release of refrigerant tends to cool the oil and thus actually serves to oppose the release itself: for this reason, it isadvisable to switch on the crankcase heating elements, if available, during the evacuation process.


INSTALLATION

If a high % of refrigerant gets into contact with the Pirani gauge(vacuum sensor), it may “drug” the sensitive element of the latter,rendering it inefficient for a certain period of time. For this reason,if no machine for recovering refrigerant is available, it isnonetheless advisable to switch on the crankcase heatingelements and avoid applying a vacuum until the circuit has beenadequately purged of refrigerant: the refrigerant may in factsolubilize in the oil of the vacuum pump, undermining itsperformance for a long time (hours).

5. Charging positions [single point]

The best position for charging the air conditioners is the sectionbetween the thermostatic valve and the evaporator; care shouldbe taken to avoid fixing the thermostat bulb until the operationis complete: this is important to ensure that the valve orifice

remains open so as to allow the passage of refrigerant alsotoward the condenser/receiver.

Air-condensed water chillers should be charged withrefrigerant in the section between the condenser andthermostatic valve: this favours flow into the larger-sizedexchanger.

If possible, avoid the inflow of refrigerant into the compressoras this may cause excessive dilution of the lubricant; in anycase, first check the compatibility between the crankcasecapacity and the required charge volumes.

ELECTRICAL CONNECTIONS

GENERALITIES

Before carrying out any job onelectrical parts, make sure the powersupply is disconnected.

Check that the mains electricity supply is compatible with thespecifications (voltage, number of phases, frequency) shownon the unit rating plate.

The power connection for single-phase loads is to be made witha three-pole cable and “N” wire at the centre of the star [optional:power supply w/o neutral]

The size of the cable and lineprotections must conform to thespecifications provided in the wiringdiagram.

The supply voltage may not undergo fluctuations exceeding ±5%and the unbalance between phases must always be below 2%.

The above operating conditionsmust always be complied with:failure to ensure said conditionswill result in the immediateinvalidation of the warranty.

The electrical connections must be made in accordance withthe information shown in the wiring diagram provided withthe unit and with current and local regulations.

An earth connection is mandatory. The installer mustconnect the earthing wire using the earthing terminal situatedon the electric control board (yellow and green wire).

The power supply to the control circuit is taken from the powerline through an insulating transformer situated on the electriccontrol board.

The control circuit is protected by suitable fuses or automaticbreakers depending on the unit size.


STARTING UP

STARTING UP

PRELIMINARY CHECKS

- Check that the electrical connections have been madeproperly and that all the terminals are securely tightened.This check should also be included in a periodic six-monthinspection.

- Check that the voltage at the RST terminals is 400 V ±5% and make sure the yellow indicator light of the phasesequence relay is on. The phase sequence relay ispositioned on the electric control board; if the sequenceis not duly observed, it will not enable the machine to start.

- Make sure there are no refrigerant leaks that may havebeen caused by accidental impacts during transport and/or installation.

- Check the power supply to the crankcase heatingelements, where present.

The heating elements must be turnedon at least 12 hours before the unit isstarted. They are automaticallyactivated when the main switch is puton. Their function is to raise the T ofthe oil in the sump and limit thequantity of refrigerant dissolved in it.

To verify whether the heating elements are working properly,check the lower part of the compressors: it should be warm orin any case at a temperature 10 - 15 °C higher than the ambienttemperature.

The diagram above illustrates a specific property of gases[Charles’ Law], which are more soluble in liquids as thepressure increases but less soluble as the temperatureincreases: if the oil in the sump is held at a constant pressure,

an increase in temperature will significantly reduce the amountof refrigerant dissolved in it, thus ensuring that the desiredlubricating function is maintained.

Pressure

Oil T

% R407C in oil


STARTING UP

STARTING UP FOR THE FIRST TIME

Installation:

• Attention: the unit is filled with HFC R407C refrigerant.This refrigerant belongs to group I ( no toxic - nodangerous) according to EN Norm 378 and accordingthe specification contained into CEE law n° 2037/00.

• Install the unit in the computer room. Make sure thatthe air inlet grilles have more than 0,3 m free spacearound. [ left - right side ]

• The condensate discharge lines can suitably pass in

pre-sheared holes on the unit basament.

Electrical connections:

• Open electrical panel.

• Disconnect the main switch.

• Inlet cables holes are positioned on the bottom side

of the unit

• Connect the power supply and the earth connection

to the main switch and to the main earth connection.

• 3 phase versions only. In case of wrong phasesequence, the compressor will start in the oppositedirection: scroll compressors have to turn in one onlydirection. The phase sequence relay is connected inseries with the air flow switch, so that if wrong R-S-Toccurs an “FL” alarm on mP will appear. In this casedisconnect the power supply, reverse two phasesbefore the main switch and restart. NB: the R-S-Tphase sequence device is positioned in the left partof the E-Panel: green light means power presenceand the yellow light means correct phase sequence;if the yellow light doesn’t shine, switch of the mainswitch and reverse two cables before the main switch.

• Close the panel.

• Press button “ON” on the microprocessor keyboard.

Start Up

• Make sure that the air flows normally and the flow

switch alarm is not present.

• Press the “ON” button on the mP keyboard:

o The indoor fan will start immediatelyo After 20 second and if no alarm are

present, the compressor will start up. NB:the compressor will start if the indoorconditions are according the set pointpresetted in the mP.

• Check the air Delta T: it has to be between 7 and

10 °C.

• Check for refrigerant leakage.

Operation

• Use the microprocessor and the unit manuals


STARTING UP

STARTING OPERATION

Before starting the unit, turn the main switch on, select theoperating mode desired from the control panel and press the“ON” button on the control panel.

If the unit fails to start up, check if the servicethermostat has been set according to the nominalvalues provided

You should not disconnect the unit fromthe power supply during periods when itis inoperative but only when it is to betaken out of service for a prolongedperiod (e.g. at the end of the season). Toturn off the unit temporarily follow thedirections provided in the section 4.5.

CHECKS DURING OPERATION

- Check the phase sequence relay on the control board toverify whether the phases occur in the correct sequence:if they do not, disconnect the unit from power supply andinvert two phases of the incoming three-pole cable. Neverattempt to modify internal electrical connections: anyundue modifications will immediately invalidate thewarranty.

- Check that the temperature of the water entering theevaporator is close to the value set on the servicethermostat.


STARTING UP

CHECKING THE REFRIGERANT LEVEL

- After a few hours of operation, check whether the liquid levelindicator has a green ring: a yellow colour indicates thepresence of humidity in the circuit. In such a case the circuitmust be dehumidified by qualified personnel.

- Large quantities of bubbles should not appear through theliquid level indicator. A constant passage of numerousbubbles may indicate that the refrigerant level is low andneeds to be topped up. The presence of a few bubbles ishowever allowed, especially in the case of high-glide ternarymixtures such as HFC R407C

- Also check that the end-of-evaporation temperature shownon the pressure gauge (refer to the pressure gauge scalefor the refrigerant R407C, marked with the initials D.P. - DewPoint) is about 4 °C lower than the temperature of the waterleaving the evaporator.

- Make sure the overheating of the cooling fluid is limited tobetween 5 and 8 °C: to this end:

1) read the temperature indicated by a contact thermometerplaced on the compressor intake pipe;

2) read the temperature indicated on the scale of a pressuregauge likewise connected to the intake side; refer to thepressure gauge scale for the refrigerant R407C, markedwith the initials D.P. (Dew Point).The degree of overheating is given by the differencebetween the temperatures thus determined.

- Make sure that the Sub-cooling of the cooling fluid islimited to between 3 and 5°C: to this end:

1) read the temperature indicated by a contactthermometer placed on the compressor intake pipe;

2) read the temperature indicated on the scale of apressure gauge connected to the liquid inlet at thecondenser outlet; refer to the pressure gauge scalefor the refrigerant R407C, marked with the initials B.P.(Bubble Point).The degree of Sub-cooling is given by the differencebetween the temperatures thus determined.

Warning: all THN units are chargedwith R407C. Any top-ups must bemade using the same type ofrefrigerant. This operation is to beconsidered extraordinarymaintenance work and must beperformed by qualified personnel only.

Warning: the refrigerant R407Crequires “POE” polyolester oil of thetype and viscosity indicated on thecompressor rating plate.For no reason should oil of a differenttype be introduced into the oil circuit.

Real Pcompressoroutlet

Average T(T1+T2)/2

T1 (start of condensation)DEW POINT

T2 (end of condensation)BUBBLE POINT

Heat content h

- The difference between the Dew Point and Bubble Point is known as “GLIDE” and this is a characteristic property ofrefrigerant mixtures. If pure fluids are used, the phase change occurs at a constant T and thus the glide is equal to zero.


SETTING OPERATING PARAMETERS


GENERALITIES

All the control devices are set and tested in the factorybefore the unit is dispatched. However, after the unithas been in service for a reasonable period of time youcan perform a check on the operating and safetydevices. The settings are shown in Tables II and III.

All servicing of the equipment is to be consideredextraordinary maintenance and may be carried out BYQUALIFIED TECHNICIANS ONLY: incorrect settingsmay cause serious damage to the unit and injuries topersons.

The operating parameters and control system settingsconfigurable by means of the microprocessor control arepassword protected if they have a potential impact onthe integrity of the unit.

TABLE II - SETTING OF CONTROL DEVICES

CONTROL DEVICE

Differential air pressure switch (outlet air flow)

Differential air pressure switch (dirty filter)

Pa

Pa

SET POINT

50

50

DIFFERENTIAL

30

20

CONTROL DEVICE

Maximum pressure switch

Minimum pressure switch

Modulating condensation control device

Time lapse between two compressor starts

Bars-r

Bars-r

Bars-r

s

ACTIVATION

28.0

2

14

480

DIFFERENTIAL

4

1.5

7

-

RESETTING

ManualAutomatic

-



MAXIMUM PRESSURE SWITCH

The high pressure switch stops the compressor when the outletpressure exceeds the set value.

Warning: do not attempt to changethe setting of the maximum pressureswitch: Should the latter fail to tripin the event of a pressure increase,the pressure relief valve will open.

The high pressure switch must be manually reset; this is possibleonly when the pressure falls below the set differential (see TableIII).

MINIMUM PRESSURE SWITCH

The low pressure switch stops the compressor when theinlet pressure falls below the set value for more than 120seconds.

The switch is automatically reset when the pressure risesabove the set differential (see Table III);


ROUTINE MAINTENANCE AND CHECKS


The only operations to be performed by the user are to switchthe unit on and off.All other operations are to be considered maintenance workand must thus be carried out by qualified personnel trainedto do their job in accordance with current laws and regulations.

WARNINGS

All the operations described in thischapter MUST ALWAYS BEPERFORMED BY QUALIFIEDPERSONNEL ONLY.

Before carrying out any work on theunit or accessing internal parts, makesure you have disconnected it from themains electricity supply.

The upper part and the outlet pipe ofthe compressor reach hightemperatures. Be especially carefulwhen working in the surrounding areawith the panels off.

Be especially careful when working inproximity to finned coils since the 0.11mm-thick aluminium fins can causesuperficial injuries due to cuts.

After completing maintenance jobs,always replace the panels enclosingthe units and secure them with thefastening screws provided.



GENERALITIES

To guarantee a constantly satisfactory performance over time, it is advisable to carry out routine maintenance andchecks as described below. The indications below are related to standard tear and wear.

Operation

• Check the efficiency of all the control and safety devices• Check the terminals on the electric control board and compressor terminal boards to

ensure that they are securely tightened. The movable and fixed contacts of the circuitbreakers must be periodically cleaned and replaced whenever they show signs ofdeterioration

• Check the refrigerant level by means of the liquid level indicator• Check the efficiency of the differential air pressure switch and dirty filter differential pressure

switch• Check the condition of the air filter and replace it if necessary• Check the humidity indicator (green=dry, yellow=humid) on the liquid level indicator; if the

indicator is not green as shown on the indicator sticker, replace the filter

Frequency

Once a yearOnce a year

Every 6 mos.Every 6 mos.

Every 6 mos.Every 6 mos.

INSPECTING THE AIR FILTER

– Remove the panel above the condenser fan to access the damper and air filter compartment.– Pull out the air filter.– Check the condition of the filter and replace it if necessary



INSPECTING THE DAMPER SERVOMOTOR

– Remove the panel above the condenser fan– Remove the damper fastening screws (see fig. below)

– Pull out the entire damper section to access the servomotor



REPAIRING THE COOLING CIRCUIT

Warning: while performing repairs on thecooling circuit or maintenance work onthe compressors, make sure the circuitis left open for as little time as possible.Even if briefly exposed to air, ester oilstend to absorb large amounts ofhumidity, which results in the formationof weak acids.

If the cooling circuit has undergone any repairs, the followingoperations must be carried out:

- tightness test;- evacuation and drying of the cooling circuit;- charging with refrigerant.

If the system has to be drained, alwaysrecover the refrigerant present in thecircuit using suitable equipment; therefrigerant should be handledexclusively in the liquid phase.



TIGHTNESS TEST

Fill the circuit with anhydrous nitrogen supplied from a tankwith a pressure-reducing valve until the pressure rises to 22bars.

During the pressurisation phase, do notexceed a pressure of 22 bars on thecompressor low pressure side.

The presence of any leaks must be determined using specialleak detectors. Should any leaks be detected during the test,empty out the circuit before repairing the leaks with suitablealloys.

Do not use oxygen in the place ofnitrogen as a test agent, since thiswould cause a risk of explosion.

HARD VACUUM AND DRYING OF COOLING CIR-CUIT

To achieve a hard vacuum in the cooling circuit it is necessaryto use a pump capable of generating a high degree of vacuum,i.e. 150 Pa of absolute pressure with a capacity ofapproximately 10 m3/h. If such a pump is available, oneevacuation will normally suffice to achieve an absolute pressureof 150 Pa.

If there is no such vacuum pump available, or whenever thecircuit has remained open for long periods of time, you arestrongly recommended to adopt the triple evacuation method.This method is also recommended when there is a presenceof humidity within the circuit.

The vacuum pump should be connected to the inlets.

The procedure to be carried out is as follows:

- Evacuate the circuit until you reach an absolute pressure ofat least 350 Pa: at this point inject nitrogen into the circuituntil you reach a relative pressure of about 1 bar.

- Repeat the step described above.

- Carry out the step described above for the third time, but inthis case attempting to reach the hardest vacuum possible.

Using this procedure you can easily remove up to 99% ofpollutants.



RECHARGING WITH REFRIGERANT R407C

- Connect the tank of refrigerant gas to the male 1/4 SAE inletsituated on the liquid line after discharging a little gas toeliminate air in the connection pipe.

- Fill with refrigerant in liquid form until you reach 75% ofthe total charge.

- Then connect to the inlet on the pipe between the thermostaticvalve and evaporator and complete the charging processwith the refrigerant in liquid form until no more bubbles canbe seen on the liquid level indicator and the operatingparameters specified in section 4.4 have been reached.

Since R407C is a ternary mixture,charging must take place exclusivelywith liquid refrigerant to ensure thecorrect percentages of the threeconstituents.Introduce refrigerant through the inletin the liquid line.

A unit that was originally charged withR407C in the factory must not becharged with R22 or other refrigerantswithout the written authorisation ofHiRef S.p.A.

ENVIRONMENTAL PROTECTION

The law implementing the regulations [reg. EEC 2037/00] whichgovern the use of ozone-depleting substances and greenhousegases bans the dispersal of refrigerant gases in theenvironment and requires whoever is in their possession torecover them and, at the end of their useful life, either to returnthem to the dealer or take them to a suitable waste disposalfacility.

The refrigerant HFC R407C is not harmful to the ozone layerbut is included among the substances responsible for thegreenhouse effect and thus falls within the scope of theaforesaid regulations.

Therefore, special care should be takenwhen carrying out maintenance work tominimise refrigerant leaks.


TROUBLESHOOTING

TROUBLESHOOTING

On the next pages you will find a list of the most commoncauses that may cause the package unit to fail or malfunction.These causes are broken down according to easily identifiablesymptoms.

You should be extremely careful whenattempting to implement any of the possibleremedies suggested: overconfidence canresult in injuries, even serious ones, to inexpertindividuals. Therefore, once the cause hasbeen identified, you are advised to contact themanufacturer or a qualified technician for help.

FAULT

The unit does not start

The compressor is noisy

Presence of abnormally highpressure

Possible causes

No power supply

The electronic card is cut off from thepower supplyAlarms have been triggered

The phase sequence is wrong

The compressor is rotating in the wrongdirection

Insufficient flow of air to the condenser

Presence of air in the refrigerant circuit,as revealed by the presence of bubblesin the flow indicator also withundercooling values exceeding 5 °C

Corrective actions

Check that power is being supplied bothto the primary and auxiliary circuits.

Check the fuses

Check whether any alarms are signalledon the microprocessor control panel,eliminate the causes and restart the unit.Invert two phases in the primary powerline after disconnecting them upstreamfrom the unit

Check the phase sequence relay. Invertthe phases on the terminal board afterdisconnecting the unit and contact themanufacturer.

Check for the presence of obstructionsin the condenser section ventilationcircuitCheck whether the condenser coilsurface is obstructedCheck the condensation control device[optional]

Drain and pressurise the circuit andcheck for leaks. Evacuate slowly [formore than 3 hours] until reaching apressure of 0.1 Pa and then recharge inthe liquid phase


TROUBLESHOOTING

FAULT

Presence of abnormally highpressure

Low condensation pressure

Low evaporation pressure

The compressor does not start

Possible causes

Unit overcharged, as revealed by anSub-cooling of more than 8 °C

Thermostatic valve and/or filterobstructed. These symptoms may alsooccur in the presence of an abnormallylow pressure

Transducer fault

Malfunctioning of thermostatic valve

Filter dryer clogged

Low condensation T

Low level of refrigerant

The internal thermal protection devicehas tripped

The circuit breakers or line fuses havebeen tripped by a short circuit

One of the high or low pressure switcheshas tripped

The phases have been inverted in thedistribution compartment

Corrective actions

Drain the circuit

Check the temperatures upstream anddownstream from the valve and filter andreplace them if necessary.

Check the efficiency of the condensationcontrol device [optional]

Warming the bulb with your hand, checkwhether the valve opens and adjust it ifnecessary. If it does not respond,replace it.

Pressure drops upstream anddownstream from the filter should notexceed 2°C. If they do, replace the filter.

Check the efficiency of the condensationcontrol device [where present]

Check the refrigerant level by measuringthe degree of Sub-cooling; if it is below2°C replenish the charge

In the case of compressors equippedwith a protection module, check thethermal contact. Identify the causes afterrestarting.

Pinpoint the cause by measuring theresistance of the individual windings andthe insulation from the casing beforerestoring power.

Check on the microprocessor, eliminatethe causes.

Check the phase sequence relay.


Technical data

TECHNICAL DATA

Model

Refrigerant

Cooling Capacity@27°/40%-35°

Standard Power Supply

Power Supply (Option 2)




Total Absorbed Power

Total Absorbed Current

FLA

LRA

Indoor Fan(s) absorbedPower in 230/1/50 execution

Indoor Fan(s) absorbedPower in 48 V DC execution(optional)

Indoor Air Flow

Indoor Air Flow during FreeCooling Operations @ 40 Pa

Full Free CoolingTemperature

Filtration

Sound Power Level

Outdoor Noise Level:SPL @ 2m FF

Type of compressor

Number ofrefrigerating circuits

Number of compressors

Oil charge per compressor

Indoor Coil Front Surface

Outdoor Coil Front Surface

Condenser Air Flow

Number of condenser’s fan

Overall dimensions: height H

Overall dimensions: lenght L

Overall dimensions: depth D

Weight

[Ashrae]

[W]

[V-n-f]

[V-n-f]

[V-n-f]

[V-n-f]

[V-n-f]

[W]

[A]

[A]

[A]

[W]

[W]

[m3/h]

[m3/h]

[°C]

[-]

[dB-A]

[dB-A]

[-]

[-]

[-]

[dm3]

[m2]

[m2]

[m3/h]

[-]

[mm]

[mm]

[mm]

kg

THN 045

R407C

4500

230/1/50

-

230/1/50+230/1/50

230/1/50+48 VDC

-

1810

8.3

15.1

30

108

100

1450

1320

17,8

EU3

69

58

Rotary

1

1

0.44

0.30

0.33

2250

1

800

1850

550

120

THN 056

R407C

5600

230/1/50

400/3/50

400/3/50+230/1/50

230/1/50+48 VDC

400/3/50+48 VDC

2330

14.3

16

47

108

100

1450

1320

15,5

EU3

69

58

Scroll

1

1

1

0.30

0.33

2250

1

800

1850

550

128

THN 073

R407C

7100

230/1/50

400/3/50

400/3/50+230/1/50

230/1/50+48 VDC

400/3/50+48 VDC

2990

13.6

19.6

61

310

260

2100

1980

17.0

EU3

69

58

Scroll

1

1

1

0.30

0.33

2250

1

800

1850

550

135

THN 090

R407C

8970

400/3/50

230/1/50

400/3/50+230/1/50

400/3/50+48 VDC

230/1/50+48 VDC

3950

11.8

17.5

40

470

350

3020

2850

18.2

EU3

72

61

Scroll

1

1

1.1

0.38

0.45

3750

1 (THN)2 (THN*D)

1010

1850

550

195

THN 105

R407C

10850

400/3/50

230/1/50

400/3/50+230/1/50

400/3/50+48 VDC

230/1/50+48 VDC

4400

12.5

17.5

46

470

350

3020

2810

16.3

EU3

72

61

Scroll

1

1

1.1

0.38

0.45

3750

1 (THN)2 (THN*D)

1010

1850

550

200

THN 120

R407C

11850

400/3/50

230/1/50

400/3/50+230/1/50

400/3/50+48 VDC

230/1/50+48 VDC

5000

13.6

19.5

50

470

350

3020

2810

15.4

EU3

72

61

Scroll

1

1

1.1

0.38

0.45

3750

1 (THN)2 (THN*D)

1010

1850

550

210

THN 150

R407C

14980

400/3/50

-

400/3/50+230/1/50

400/3/50+48 VDC

-

6040

17.8

21.7

65

520

450

3800

3550

15.3

EU3

72

61

Scroll

1

1

1.36

0.42

0.52

4700

2

1160

1850

550

245

THN 170

R407C

17200

400/3/50

-

400/3/50+230/1/50

400/3/50+48 VDC

-

7030

18.6

25.7

74

520

450

3800

3550

13.6

EU3

72

61

Scroll

1

1

1.65

0.42

0.52

4700

2

1160

1850

550

250

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TELECOOL THN-IOM-0104-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 property

damage or personal injury.

Installation and service must be performed by a

qualified installer and servicing agency.

Documents

Installation, operating and maintenance TELECOOL