Lennox @DNOVA THND 045 User manual

www.lennoxemea.com
INSTALLATION, OPERATING
AND MAINTENANCE
WALL MOUNTED PACKAGED
INDOOR UNIT
@DNOVA
THN
2,5 - 38 kW ADNOVA-THN_R410A-
IOM-1506-E

@DNOVA THN_R410A-IOM-1506-E - 1-
1General Description 2
1.1 Structure 2
1.2 Field of application 2
1.3 Cooling circuit 3
1.4 Installation warnings 4
2Inspection / Transport / Positioning 5
2.1 Inspection on receipt 5
2.2 Lifting and Transport 5
2.3 Unpacking 5
2.4 Positioning 5
3Installation 10
4Evacuation and Charging Operations 11
4.1 Introduction 11
4.2 Vacuum and charging machine 12
4.3 Evacuating a circuit “contaminated” with refrigerant 12
4.4 Charging positions (single point) 13
5Electrical Connections 13
5.1 Generalities 13
6Starting Up 14
6.1 Preliminary checks 14
6.2 Starting up instructions 15
7Setting Operating Parameters 17
7.1 Generalities 17
7.2 Maximum pressure switch 17
7.3 Minimum pressure switch 17
8Maintenance 18
8.1 Warnings 18
8.2 Generalities 18
8.3 Inspecting the air filter 19
8.4 Inspecting the damper servomotor 19
8.5 Repairing the cooling circuit 20
8.6 Tightness test 20
8.7 Hard vacuum and drying of cooling circuit 20
8.8 Recharging with refrigerant R410A 21
8.9 Environmental protection 21
9Troubleshooting 22

@DNOVA THN_R410A-IOM-1506-E - 2-
1 General Description
THND/U “Lennox Telecom units” are air conditioners for low- and medium-powered telephone exchanges.
They are designed to be mounted inside shelter.
THND/U 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.
1.1 Structure
All THND/U 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.
1.2 Field of application
THND/U 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 (see Tab. 1)
Tab. 1 Operating limis
Model THND/U/X 045
THND/U/X
056
THND/U/X
073
THND/U/X
090
THND/U/X
105
THND/U/X
120
THND/U/X
150
Power supply 230Vac 10%
24Vdc 16% / 48Vdc 16%
400Vac 10% / 3Ph + N / 50Hz
24Vdc 16% / 48Vdc 16%
Minimum outdoor
temperature T - 20 °C
Maximum outdoor
temperature T
45 °C 45 °C 45 °C 47,0 °C 45,0 °C 46,0 °C 48,0 °C
Minimum indoor
temp./humidity
conditions 19 °C / 30 % U.R.
Maximum indoor
temp./humidity
conditions 35 °C / 50 % U.R.
Storage conditions -10 °C / 90 % U.R.
+55 °C / 90 % U.R.
Model THND/U/X
170
THND/U/X
180
THND/U/X
200
THND/U/X
220
THND/U/X
250
Power supply 400Vac 10% / 3Ph + N / 50Hz
Minimum outdoor
temperature T
- 20 °C
Maximum outdoor
temperature T
45 °C 46 ° 45 °C 46,0 °C 46,0 °C
Minimum indoor
temp./humidity conditions
19 °C / 30 % U.R.
Maximum indoor
temp./humidity conditions
35 °C / 50 % U.R.
Storage conditions -10 °C / 90 % U.R.
+55 °C / 90 % U.R.

@DNOVA THN_R410A-IOM-1506-E - 3-
1.3 Cooling circuit
The entire cooling circuit is built in the Lennox 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
THND/U/X units. Today scroll compressors represent the best solution in terms of reliability, efficiency
and MTBF.
Cooling components:
oMolecular mesh activated-alumina filter dryer
oFlow indicator with humidity indicator. Indications are provided directly on the sight glass.
oThermostatic valve with external equalization and integrated MOP function.
oHigh and low pressure switches
oSchrader 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;
oSwitching on/off of compressor to maintain the temperature set point T inside the shelter
oAlarm management
High / low pressure
Dirty filters alarm
Air flow alarm
oAlarm signalling
oDisplay of operating parameters
oRS232, RS485 serial output management (optional)
oPhase 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]