Related Manuals for Lennox DNOVA THS025
Summary of Contents for Lennox DNOVA THS025
- Page 1 Installation, operating and maintenance @DNOVA THS Telecom split unit Providing IT Climate Technology @DNOVA_THS-IOM-0508-E...
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Page 3: Table Of Contents
CONTENTS INDEX Page GENERAL DESCRIPTION Basic cooling circuit Installation warnings INSPECTION / TRANSPORT Inspection on receipt Lifting and transport Unpacking INSTALLATION Positioning ELECTRICAL CONNECTIONS STARTING UP Preliminary checks Starting up for the first time Starting operation Checks during operation Checking the refrigerant level SETTING OPERATING PARAMETERS Generalities Maximum pressure switch... -
Page 4: General Description
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. -
Page 5: Basic Cooling Circuit
Dirty filters alarm Air flow alarm Alarm signalling Display of operating parameters RS232, RS485 serial output management (optional) 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. - Page 6 THI 025-035 VTM THI 045-145 IOM / @DNOVA_THS-0508...
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Page 7: Installation Warnings
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 maintenance work. -
Page 8: Inspection/Transport
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. -
Page 9: Installation
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;... - Page 10 Freecooling duct connections (optional) The air conditioner may be supplied with an integrated Freecooling device (optional), which uses fresh air from outside to cool the ambient without starting up the compressor. The device supplies the correct cooling capacity required, through a modulating motor damper. In this case, the back side of the unit is equipped with connections collect the outside air, as follows: ...
- Page 11 Refrigerant connections THIS OPERATION MUST BE CARRIED OUT BY AN EXPERT TECHNICIAN 1. Lines positioning Connect the air conditioner to the condensing unit by using refrigerant lines in hard or soft copper. Limit the number of preshaped bends; if this is not possible, every bend must have a radius of at least 100mm ...
- Page 12 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;...
- Page 13 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 - Oil T Pressure...
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Page 14: Electrical Connections
ELECTRICAL CONNECTIONS 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. -
Page 15: Starting Up
STARTING UP a. 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. - Page 16 Following wiring diagram instructions make electrical connections between THI and THC units 230/1/50 power supply and power supply and auxiliary circuit cables. Connect user interface to microprocessor J10 connector (you can find it in THS wiring diagram) using a telephone cable. ...
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Page 17: Starting Operation
c. 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. - Page 18 Real P compressor Average T outlet (T1+T2)/2 T1 (start of condensation) DEW POINT T2 (end of condensation) BUBBLE POINT R407C 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.
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Page 19: Setting Operating Parameters
SETTING OPERATING PARAMETERS a. 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. -
Page 20: Maintenance
MAINTENANCE 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. a. -
Page 21: Inspecting The Air Filter
c. Inspecting the air filter Remove the grilled panel to access the damper and air filter compartment. Pull out the air filter. Check the condition of the filter and replace it if necessary. d. Inspecting the damper servomotor ... -
Page 22: Repairing The Cooling Circuit
e. 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. -
Page 23: Recharging With R407C Refrigerant
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 LENNOX Environmental protection The law implementing the regulations [reg. EEC 2037/00] which govern the use of ozone-depleting... -
Page 24: 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. - Page 25 FAULT Possible causes Corrective actions Presence of abnormally high Unit overcharged, as revealed by Drain the circuit pressure an Sub-cooling of more than 8 °C Thermostatic valve and/or filter Check the temperatures upstream obstructed. These symptoms may and downstream from the valve also occur in the presence of an and filter and replace them if abnormally low pressure.
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Page 26: Overall Dimensions
OVERALL DIMENSIONS THI 025-145 IOM / @DNOVA_THS-0508... -
Page 27: Technical Data Sheet
10. TECHNICAL DATA SHEET Technical Data internal unit Model THI025 THI035 THI045 THI056 THI073 THI090 THI105 THI120 THI145 [Ashrae] Refrigerant R407C R407C R407C R407C R407C R407C R407C R407C R407C Cooling [kW] 2,60 3,60 4,50 5,60 7,30 9,00 10,40 12,00 14,50 capacity @27°/40%, 35°... - Page 28 Technical Data external unit Model THC025 THC035 THC045 THC056 THC073 THC090 THC105 THC120 THC145 Refrigerant [Ashrae] R407C R407C R407C R407C R407C R407C R407C R407C R407C Power [V-n-f] 230/1/50 230/1/50 230/1/50 230/1/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 supply (standard) Total 1.180 1.320 1.760 2.210...
- Page 30 BELGIUM, LUXEMBOURG RUSSIA Due to Lennox’s ongoing commitment to quality, www.lennoxbelgium.com www.lennoxrussia.com the Specifications, Ratings and Dimensions are subject to change without notice and without incurring liability. CZECH REPUBLIC SLOVAKIA Improper installation, adjustment, alteration, www.lennoxczech.com www.lennoxdistribution.com service or maintenance can cause property damage or personal injury.