Lennox THN 105, THN 073, THN056, THN 090, THN 120 Installation And Operating Manual

INSTALLATION
AND OPERATING
MAINTENANCE MANUAL

TELECOOL THN

English
January 2004

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 with
epoxy polyester powder paint oven cured at 180°C (RALxxxx).
The unit features an exclusive design which, combined with a
rational layout of components and extremely compact
dimensions, lends it an attractive appearance.

Field of Application:

Model

Power supply

Minimum outdoor
temperature T
Maximum outdoor
temperature T
Minimum indoor
temp./humidity conditions
Maximum indoor
temp./humidity conditions

Storage conditions

Cooling circuit

The entire cooling circuit is built in the HiRef factory using
only components of the finest quality brands and processes
conforming to the specifications of Directive 97/23 for brazing
and testing.



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



Cooling components:

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 with Directives
73/23/EEC and 89/336/EEC and related standards.
The board may be accessed through a door after the
main switch has been put off. All the remote controls
use 24 V signals powered by an insulating transformer
situated on the electric control board.

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



Control microprocessor: the microprocessor built into
the unit allows the different operating parameters to
be controlled from a set of pushbuttons situated on
the electric control board;

o Switching on/off of compressor to maintain the

temperature set point T inside the shelter

o Alarm management

 High / low pressure

 Dirty filters alarm
 Air flow alarm

o Alarm signalling
o Display of operating 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]

GENERAL DESCRIPTION

THN “HiRef Telecom units” are air conditioners for low- and
medium-powered telephone exchanges. They are designed
to be mounted inside shelter.
THN air conditioners are direct expansion package units with
an air-cooled condenser system. They are distinguished by
an innovative air circulation system which significantly
enhances performance in all operating conditions.

THN THN THN
045 056 073

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 THN
090 105 120 150 170

400Vac+/-10% /3/50 + N

24 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 will
invalidate the warranties provided in the contract of sale.

IOM / TELECOOL THN - 0104 - E Page 3

GENERAL DESCRIPTION

BASIC COOLING CIRCUIT

ENGLISH

1 COMPRESSOR
2 CONDENSER
3 THERMOSTATIC
4 EVAPORATOR
5 FILTER DRYER
6 SIGHT GLASS
7 LOW PRESSURE SWITCH
8 HIGH PRESSURE SWITCH
9 CONDENSING PRESSURE PROBE

Page 4 - IOM / TELECOOL THN - 0104 - E

INSTALLATION WARNINGS

GENERAL RULES

-

When installing or servicing the unit, you must strictly follow the rules provided in this manual, comply with the directions on

the 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 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 the warranty.

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

GENERAL DESCRIPTION

IOM / TELECOOL THN - 0104 - E Page 5

LIFTING AND TRANSPORT

While the unit is being unloaded and positioned, utmost care
must be taken 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 accidental falls or overturning.

UNPACKING

The packing must be carefully removed to avoid the risk of
damaging the unit. Different packing materials are order to
minimise their environmental impact.

POSITIONING

Bear in mind the following aspects when choosing the best site
for 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 the
air intake and outlet flanges.
The dimensions of the air outlet/intake flanges are shown
below:

THN*D045...170 (rear view)

INSPECTION

INSPECTION

INSPECTION ON RECEIPT

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

Page 6 - IOM / TELECOOL THN - 0104 - E

THN*U045..073 – 150-170

INSPECTION

THN*U090..120 (rear view)

IOM / TELECOOL THN - 0104 - E Page 7

INSTALLATION

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

The following steps should be carried out to ensure proper
installation:

- Apply a vibration-damping rubber lining between the
unit and wall

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

- carefully seal the entire perimeter of the unit on the
interior wall of the shelter and the air intake and outlet
flanges on the inside.

INSTALLATION

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

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

Unit model

THN045
THN056
THN073

THN090
THN105

THN120
THN150
THN170

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

Page 8 - IOM / TELECOOL THN - 0104 - E

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 in
accordance 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 ], as
shown 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 Ö pressure drop in tank

- pressure drop in tank Ö T drop change of state

- T drop change of state Ö evaporation of part of the liquid, causing the liquid itself to
cool

- cooling of liquid Ö thermal exchange with ambient air, further evaporation of
remaining liquid; the original pressure is restored in the tank
after a certain amount of time

Fig. 1

T tank/ambient

Saturated gas

Saturated liquid

IOM / TELECOOL THN - 0104 - E Page 9

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

Fig. 3

Time

The figure represents a vacuum cycle and an optimal
subsequent pressure rise for the refrigeration devices we
manufacture.

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

4.

Evacuating a circuit “contaminated” with refrigerant

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

Refrigerants

all tend to dissolve in oil [compressor sump] in
percentages that are directly proportional to increases in
pressure 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 is
advisable to switch on the crankcase heating elements, if available, during the evacuation process.

Page 10 - IOM / TELECOOL THN - 0104 - E

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 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 position for charging the air conditioners is the section
between the thermostatic valve and the evaporator; care should
be taken to avoid fixing the thermostat bulb until the operation
is complete: this is important to ensure that the valve orifice

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

Air-condensed water chillers should be charged with
refrigerant in the section between the condenser and
thermostatic valve: this favours flow into the larger-sized
exchanger.

If possible, avoid the inflow of refrigerant into the compressor
as this may cause excessive dilution of the lubricant; in any
case, first check the compatibility between the crankcase
capacity and the required charge volumes.

ELECTRICAL CONNECTIONS

GENERALITIES

Before carrying out any job on
electrical parts, make sure the power
supply is disconnected.

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

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

The size of the cable and line
protections must conform to the
specifications provided in the wiring
diagram.

The supply voltage may not undergo fluctuations exceeding ±5%
and the unbalance between phases must always be 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 wire using the earthing terminal situated
on the electric control board (yellow and green wire).

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

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

IOM / TELECOOL THN - 0104 - E Page 11

STARTING UP

STARTING UP

PRELIMINARY CHECKS

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

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

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

- Check the power supply to the crankcase heating
elements, where present.

The heating elements must be turned
on at least 12 hours before the unit is
started. They are automatically
activated when the main switch is put
on. Their function is to raise the T of
the oil in the sump and limit the
quantity 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 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 the amount
of refrigerant dissolved in it, thus ensuring that the desired
lubricating function is maintained.

Pressure

Oil T

% R407C in oil

Page 12 - IOM / TELECOOL THN - 0104 - E

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 - no
dangerous) according to EN Norm 378 and according
the specification contained into CEE law n° 2037/00.

• Install the unit in the computer room. Make sure that

the air inlet grilles have more than 0,3 m free space
around. [ 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 phase

sequence, the compressor will start in the opposite
direction: scroll compressors have to turn in one only
direction. The phase sequence relay is connected in
series with the air flow switch, so that if wrong R-S-T
occurs an “FL” alarm on mP will appear. In this case
disconnect the power supply, reverse two phases
before the main switch and restart. NB: the R-S-T
phase sequence device is positioned in the left part
of the E-Panel: green light means power presence
and the yellow light means correct phase sequence;
if the yellow light doesn’t shine, switch of the main
switch 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 immediately
o After 20 second and if no alarm are

present, the compressor will start up. NB:
the compressor will start if the indoor
conditions are according the set point
presetted 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

IOM / TELECOOL THN - 0104 - E Page 13

STARTING UP

STARTING OPERATION

Before starting the unit, turn the main switch on, select the
operating 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 service
thermostat has been set according to the nominal
values provided

You should not disconnect the unit from
the power supply during periods when it
is inoperative but only when it is to be
taken out of service for a prolonged
period (e.g. at the end of the season). To
turn off the unit temporarily follow the
directions provided in the section 4.5.

CHECKS DURING OPERATION

- Check the phase sequence relay on the control board to
verify whether the phases occur in the correct sequence:
if they do not, disconnect the unit from power supply and
invert two phases of the incoming three-pole cable. Never
attempt to modify internal electrical connections: any
undue modifications will immediately invalidate the
warranty.

- Check that the temperature of the water entering the

evaporator is close to the value set on the service
thermostat.

Page 14 - IOM / TELECOOL THN - 0104 - E

STARTING UP

CHECKING THE REFRIGERANT LEVEL

-

After a few hours of operation, check whether the liquid level
indicator has a green ring: a yellow colour indicates the
presence of humidity in the circuit. In such a case the circuit
must be dehumidified by qualified personnel.

- Large quantities of bubbles should not appear through the

liquid level indicator. A constant passage of numerous
bubbles may indicate that the refrigerant level 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

- Also check that the end-of-evaporation temperature shown

on the pressure gauge (refer to the pressure gauge scale
for the refrigerant R407C, marked with the initials D.P. - Dew
Point) is about 4 °C lower than the temperature of the water
leaving the evaporator.

- 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

gauge likewise connected to the intake side; refer to the
pressure gauge scale for the refrigerant R407C, marked
with the initials D.P. (Dew Point).
The degree of overheating is given by the difference
between the temperatures thus determined.

- Make sure that the Sub-cooling of the cooling fluid is

limited to between 3 and 5°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 gauge connected to the liquid inlet at the
condenser outlet; refer to the pressure gauge scale
for the refrigerant R407C, marked with the initials B.P.
(Bubble Point).
The degree of Sub-cooling is given by the difference
between the temperatures thus determined.

Warning: all THN units are charged
with R407C. Any top-ups must be
made using the same type of
refrigerant. This operation is to be
considered extraordinary
maintenance work and must be
performed by qualified personnel only.

Warning: the refrigerant R407C
requires “POE” polyolester oil of the
type and viscosity indicated on the
compressor rating plate.
For no reason should oil of a different
type be introduced into the oil circuit.

Real P
compressor
outlet

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 of
refrigerant mixtures. If pure fluids are used, the phase change occurs at a constant T and thus the glide is equal to zero.

IOM / TELECOOL THN - 0104 - E Page 15

SETTING OPERATING PARAMETERS

SETTING OPERATING PARAMETERS

GENERALITIES

All the control devices are set and tested in the factory
before the unit is dispatched. However, after the unit
has been in service for a reasonable period of time you
can perform a check on the operating and safety
devices. The settings are shown in Tables II and III.

All servicing of the equipment is to be considered
extraordinary maintenance and may be carried out BY
QUALIFIED TECHNICIANS ONLY: incorrect settings
may cause serious damage to the unit and injuries to
persons.

The operating parameters and control system settings
configurable by means of the microprocessor control are
password protected if they have a potential impact on
the 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

Manual

Automatic

-

Page 16 - IOM / TELECOOL THN - 0104 - E

SETTING OPERATING PARAMETERS

MAXIMUM PRESSURE SWITCH

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

Warning: do not attempt to change
the setting of the maximum pressure
switch: Should the latter fail to trip
in the event of a pressure increase,
the pressure relief valve will open.

The high pressure switch must be manually reset; this is possible
only when the pressure falls below the set differential (see Table
III).

MINIMUM PRESSURE SWITCH

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

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

IOM / TELECOOL THN - 0104 - E Page 17

ROUTINE MAINTENANCE AND CHECKS

ROUTINE MAINTENANCE AND CHECKS

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

WARNINGS

All the operations described in this
chapter MUST ALWAYS BE
PERFORMED BY QUALIFIED
PERSONNEL ONLY.

Before carrying out any work on the
unit or accessing internal parts, make
sure you have disconnected it from the
mains electricity supply.

The upper part and the outlet pipe of
the compressor reach high
temperatures. Be especially careful
when working in the surrounding area
with the panels off.

Be especially careful when working in
proximity to finned coils since the 0.11
mm-thick aluminium fins can cause
superficial injuries due to cuts.

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

Page 18 - IOM / TELECOOL THN - 0104 - E

ROUTINE MAINTENANCE AND CHECKS

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

• 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 circuit
breakers must be periodically cleaned and replaced whenever they show signs of
deterioration

• 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 year
Once 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

IOM / TELECOOL THN - 0104 - E Page 19

ROUTINE MAINTENANCE AND CHECKS

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

Page 20 - IOM / TELECOOL THN - 0104 - E

ROUTINE MAINTENANCE AND CHECKS

REPAIRING THE COOLING CIRCUIT

Warning: while performing repairs on the
cooling circuit or maintenance work on
the compressors, make sure the circuit
is left open for as little time as possible.
Even if briefly exposed to air, ester oils
tend to absorb large amounts of
humidity, which results in the formation
of weak acids.

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

- tightness test;

- evacuation and drying of the cooling circuit;

- charging with refrigerant.

If the system has to be drained, always
recover the refrigerant present in the
circuit using suitable equipment; the
refrigerant should be handled
exclusively in the liquid phase.

IOM / TELECOOL THN - 0104 - E Page 21

ROUTINE MAINTENANCE AND CHECKS

TIGHTNESS TEST

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

During the pressurisation phase, do not
exceed a pressure of 22 bars on the
compressor low pressure side.

The presence of any leaks must be determined using special
leak detectors. Should any leaks be detected during the test,
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.

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
approximately 10 m

3

/h. If such a pump is available, one
evacuation will normally suffice to achieve an absolute pressure
of 150 Pa.

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

at least 350 Pa: at this point inject nitrogen into the circuit
until 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 in

this case attempting to reach the hardest vacuum possible.

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

Page 22 - IOM / TELECOOL THN - 0104 - E

ROUTINE MAINTENANCE AND CHECKS

RECHARGING WITH REFRIGERANT R407C

-

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

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

- Then connect to the inlet on the pipe between the thermostatic
valve and evaporator and complete the charging process
with the refrigerant in liquid form until no more bubbles can
be seen on the liquid level indicator and the operating
parameters specified in section 4.4 have been reached.

Since R407C is a ternary mixture,
charging must take place exclusively
with liquid refrigerant to ensure the
correct percentages of the three
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
HiRef S.p.A.

ENVIRONMENTAL PROTECTION

The law implementing the regulations [reg. EEC 2037/00] which
govern the use of ozone-depleting substances and greenhouse
gases bans the dispersal of refrigerant gases in the
environment and requires whoever is in their possession to
recover them and, at the end of their useful life, either to return
them to the dealer or take them to a suitable waste disposal
facility.

The refrigerant HFC R407C is not harmful to the ozone layer
but is included among the substances responsible for the
greenhouse effect and thus falls within the scope of the
aforesaid regulations.

Therefore, special care should be taken
when carrying out maintenance work to
minimise refrigerant leaks.

IOM / TELECOOL THN - 0104 - E Page 23

TROUBLESHOOTING

TROUBLESHOOTING

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

You should be extremely careful when
attempting to implement any of the possible
remedies suggested: overconfidence can
result in injuries, even serious ones, to inexpert
individuals. Therefore, once the cause has
been identified, you are advised to contact the
manufacturer or a qualified technician for help.

FAULT

The unit does not start

The compressor is noisy

Presence of abnormally high
pressure

Possible causes

No power supply

The electronic card is cut off from the
power supply
Alarms have been triggered

The phase sequence is wrong

The compressor is rotating in the wrong
direction

Insufficient flow of air to the condenser

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

Corrective actions

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

Check the fuses

Check whether any alarms are signalled
on the microprocessor control panel,
eliminate the causes and restart the unit.
Invert two phases in the primary power
line after disconnecting them upstream
from the unit

Check the phase sequence relay. Invert
the phases on the terminal board after
disconnecting the unit and contact the
manufacturer.

Check for the presence of obstructions
in the condenser section ventilation
circuit
Check whether the condenser coil
surface is obstructed
Check the condensation control device
[optional]

Drain and pressurise the circuit and
check for leaks. Evacuate slowly [for
more than 3 hours] until reaching a
pressure of 0.1 Pa and then recharge in
the liquid phase

Page 24 - IOM / TELECOOL THN - 0104 - E

TROUBLESHOOTING

FAULT

Presence of abnormally high
pressure

Low condensation pressure

Low evaporation pressure

The compressor does not start

Possible causes

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

Thermostatic valve and/or filter
obstructed. These symptoms may also
occur in the presence of an abnormally
low pressure

Transducer fault

Malfunctioning of thermostatic valve

Filter dryer clogged

Low condensation T

Low level of refrigerant

The internal thermal protection device
has tripped

The circuit breakers or line fuses have
been tripped by a short circuit

One of the high or low pressure switches
has tripped

The phases have been inverted in the
distribution compartment

Corrective actions

Drain the circuit

Check the temperatures upstream and
downstream from the valve and filter and
replace them if necessary.

Check the efficiency of the condensation
control device [optional]

Warming the bulb with your hand, check
whether the valve opens and adjust it if
necessary. If it does not respond,
replace it.

Pressure drops upstream and
downstream from the filter should not
exceed 2°C. If they do, replace the filter.

Check the efficiency of the condensation
control device [where present]

Check the refrigerant level by measuring
the degree of Sub-cooling; if it is below
2°C replenish the charge

In the case of compressors equipped
with a protection module, check the
thermal contact. Identify the causes after
restarting.

Pinpoint the cause by measuring the
resistance of the individual windings and
the insulation from the casing before
restoring power.

Check on the microprocessor, eliminate
the causes.

Check the phase sequence relay.

IOM / TELECOOL THN - 0104 - E Page 25

Technical data

TECHNICAL DATA

Model

Refrigerant

Cooling Capacity
@27°/40%-35°

Standard Power Supply

Power Supply (Option 2)

Power Supply (Option 3)

Power Supply (Option 4)

Power Supply (Option 5)

Total Absorbed Power

Total Absorbed Current

FLA

LRA

Indoor Fan(s) absorbed
Power in 230/1/50 execution

Indoor Fan(s) absorbed
Power in 48 V DC execution
(optional)

Indoor Air Flow

Indoor Air Flow during Free
Cooling Operations @ 40 Pa

Full Free Cooling
Temperature

Filtration

Sound Power Level

Outdoor Noise Level:
SPL @ 2m FF

Type of compressor

Number of
refrigerating 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

www.lennoxeurope.com

IOM-TELE-THN-0104-E

Due to Lennox's ongoing commitment to quality, Specifications, Ratings and Dimensions 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.

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