Lennox THS105, THS035, THS045, THS090, THS056 Installation, Operating And Maintenance Manual

Providing IT Climate Technology

@DNOVA_THS-IOM-0508-E

Installation,
operating and maintenance

@DNOVA THS Telecom split unit

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
Repairin g 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

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1. GENERAL DESCRIPTION

THS “LENNOX Telecom Split” units composed by an evaporating indoor unit THI for ceiling or wall
installation and a motor-condensing outdoor unit THC, mainly for electronic equipped shelters, process
centres, telecomunications sites from 4.5 to 14.5 kW of nominalcooling capacity.
The system provides air filtration, indoor ventilation, cooling, heating, freecooling with outdoor fresh air to
assure the useful climate in the site.

Structure

All THS units have a galvanised sheet steel supporting base and enclosing panels are painted with epoxy
polyester powder coating cured at 180°C, or, on request, painted galvanised sheet steel (RALxxxx).

Field of Application:

THS units are to be used within the operating limits stated in this manual; failure to comply with said limi ts
will invalidate the warranties provided in the contract of sale.

Cooling circuit

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

 Compresso rs

: only scroll-type compressors of leading international manufacturers are used in
the THS 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 equaliz ation 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 i s constructed and wired in accordance with
Directives 73/23/EEC and 89/336/EEC and rel ated standards. All the remote controls use 24
V signals powered by an insulating transformer. 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 microproce ssor

: 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

MODEL

THS025 THS035 THS045 THS056 THS073 THS090 THS105 THS120 THS145

230Vac ± 10%/1Ph/50Hz 400Vac ± 10%/3Ph+N /50Hz

24± 16% Vdc emergency cooling 24± 16% Vdc emergency cooling

Power supply

48± 16% Vdc emergency cooling 48± 16% Vdc emergency cooling

Min -20°C

Temperature
Outdoor

Max. 48°C 46,5°C 45°C 47°C 45°C 44°C
Min. 19 °C - 30 % r .h.

Temp./humidi ty
conditions

Max. 35 °C - 50 % r.h.
Min. + 10° C / 90 % r.h.

Storage
conditions

Max. + 55°C / 90 % r.h.

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 Dirty filters alarm
 Air flow alarm

o Alarm signalling
o Display of operatin g parameters
o RS232, RS485 serial outp ut 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

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THI 025-035 VTM

THI 045-145

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b. 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 m aintenance 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 imm ediate invalidation of the warranty.

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

6 IOM / @DNOVA_THS-0508

2. INSPECTION/TRANSPORT

a. Inspection on receipt

On receiving the unit, check that it is perf ectly 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. LENNOX 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.

b. 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 ov erturning.

c. Unpacking

The packing m ust be carefully rem oved to avoid the risk of damaging the unit. Different packing materials
are used: wood, cardboard, nylon etc. It is recommended to keep them separately and deliver them to
suitable waste disposal or recycling facilities in order to minimise their environmental impact.

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3. INSTALLATION

The THS 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.

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 of the holes for the screw anchors are shown below: