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