Table of Contents
Advertisement
Quick Links
Библиотека СОК
INSTALLATION, USE AND MAINTENANCE
MANUAL
SCOPE OF THIS MANUAL:
DIRECT EXPANSION AND CHILLED WATER
AIR CONDITIONERS
SERIES C
TECNAIR LV S.p.A
www.tecnairlv.it
Via Caduti della Liberazione 53
Manual code 75803707A.0708
21040 UBOLDO (VA)
info@tecnairlv.it
Tel. +39029699111 / Fax +390296781570
Advertisement
Table of Contents
Summary of Contents for TechLine TECNAIR LV C Series
- Page 1 Библиотека СОК INSTALLATION, USE AND MAINTENANCE MANUAL SCOPE OF THIS MANUAL: DIRECT EXPANSION AND CHILLED WATER AIR CONDITIONERS SERIES C TECNAIR LV S.p.A www.tecnairlv.it Via Caduti della Liberazione 53 Manual code 75803707A.0708 21040 UBOLDO (VA) info@tecnairlv.it Tel. +39029699111 / Fax +390296781570...
- Page 2 Manual code 75803707A.0708 Page 2 of 64...
-
Page 3: Table Of Contents
CONTENTS HOW TO USE THIS MANUAL IMPORTANT WARNINGS WARRANTY DESCRIPTION OF THE UNIT UNIT CODE 3.1.1 O / OVER (UPFLOW DISCHARGE) 3.1.2 U / UNDER (DOWNFLOW DISCHARGE) OPERATING LIMITS INSTALLATION PROCEDURE TRANSPORTATION RECEIVING THE MACHINES ON SITE POSITIONING THE UNIT AND INSTALLATION CLEARANCES PLENUMS AND PLINTHS 4.4.1 INSTALLATION OF PLENUMS AND DUCT SECTIONS... - Page 4 7.1.8 COOLING CAPACITY CONTROL WITH HOT GAS INJECTION VALVE AND ELECTRONIC EXPANSION VALVE SUPPLY AIR TEMPERATURE CONTROL (LIMIT) 7.2.1 µAC MICROPROCESSOR 7.2.2 pCO MICROPROCESSOR CONTROL HUMIDITY CONTROL 7.3.1 DIRECT EXPANSION AIR CONDITIONERS 7.3.2 CHILLED WATER AIR CONDITIONER 7.3.3 SIMULTANEOUS HUMIDIFICATION AND COOLING 7.3.4 DEHUMIDIFICATION LOCK VENTILATION...
-
Page 5: How To Use This Manual
HOW TO USE THIS MANUAL This manual describes the procedures for the installation, use and maintenance of series C air conditioning units. The following chapters contain information essential for obtaining the best performance from the unit you have purchased; TECNAIR LV therefore recommends that you study this manual carefully. Some of the topics covered in this manual refer to the functions of the microprocessor controls;... -
Page 6: Warranty
WARRANTY TECNAIR LV air conditioners are subject to the following warranty conditions which are automatically deemed to have been understood and accepted by the customer at the time of placing the order. TECNAIR LV guarantees that the products supplied are well made and of good quality. It undertakes during the period of warranty specified herein to repair or to replace with new at its own discretion, in the shortest time possible, those parts found to present recognised defects in materials, construction or workmanship that render them unfit for the intended use, provided that these faults are not the result of negligence on the part of the purchaser, neglect or... -
Page 7: Description Of The Unit
DESCRIPTION OF THE UNIT The machine in question is an air conditioner with direct expansion or chilled water coil designed for use in computer centres. The cabinet consists of hot-galvanised sheet panels in a frame constructed of painted aluminium section; the panels are made from hot-galvanised sheet steel covered in a PVC film, secured by quick-thread screws that can be unscrewed using a special safety wrench. -
Page 8: O / Over (Upflow Discharge)
3.1.1 O / OVER (UPFLOW DISCHARGE) 3.1.2 U / UNDER (DOWNFLOW DISCHARGE) Manual code 75803707A.0708 Page 8 of 64... -
Page 9: Operating Limits
OPERATING LIMITS SERIES C AIR CONDITIONING UNIT UNIT TYPE DIRECT EXPANSION CHILLED WATER CHARACTERISTICS MAXIMUM 30°C 30°C 30°C TEMPERATURE MINIMUM 21°C 19°C 20°C TEMPERATURE MAXIMUM HUMIDITY MINIMUM HUMIDITY STORAGE Temperatures from-20°C to + 50°C CONDITIONS CONDENSERS AND DRY COOLER UNIT TYPE WATER WITHOUT WITHOUT... -
Page 10: Installation Procedure
INSTALLATION PROCEDURE TRANSPORTATION Unless otherwise agreed with the Customer, TECNAIR LV shall supply their machines ex works with standard packaging consisting of: wooden pallet (1), protective polystyrene packing (2,3) and polythene sheet (4). During transportation the machines must not be laid on their sides or overturned but must remain in the vertical position at all times otherwise their internal components could be damaged. -
Page 11: Receiving The Machines On Site
RECEIVING THE MACHINES ON SITE For unloading of the units, please observe the procedures indicated in the illustrations reproduced below, which are also affixed to the original packaging of the unit. If the unit is not to be installed immediately after its arrival on site, it should remain in its original packaging and stored in a dry, enclosed area, preferably heated to a temperature of 15°C during the winter months. -
Page 12: Positioning The Unit And Installation Clearances
POSITIONING THE UNIT AND INSTALLATION CLEARANCES To avoid any problems and damage to the air conditioners during transportation, we recommend that the units should only be removed from their packaging when they have reached their final destination. It also essential to make sure that the floor on which the air conditioner is to be installed is capable of supporting its weight. -
Page 13: Plenums And Plinths
PLENUMS AND PLINTHS Various type of air distribution plenum and plinth are available as accessories for both the Under (U) and Over (O) versions of the unit. The various options are listed in the table below: Front view Right - Left side view Plenum with front grille only or both front and side grilles Front view... -
Page 14: Installation Of Plenums And Duct Sections
4.4.1 INSTALLATION OF PLENUMS AND DUCT SECTIONS The plenums and duct sections at the top of the unit are to be installed using the four brackets supplied, which are to be fitted to the upper frame members of the unit. Fixing bracket To install the brackets proceed as follows: Fix the brackets to the aluminium frame of the unit using self-tapping screws. -
Page 15: Cea Air-Cooled Condensers
CEA AIR-COOLED CONDENSERS CEA air-cooled condensers must be installed in accordance with the following instructions: HORIZONTAL INSTALLATION SINGLE ROW Remove the condenser from the packaging. Fit the fixing brackets (2) to the condenser (1). Position the condenser horizontally (4)on a support (3). Fix the feet (5)using the screws provided(6). - Page 16 Clearances for horizontal installation Clearances for vertical installation Manual code 75803707A.0708 Page 16 of 64...
-
Page 17: Water Connections
WATER CONNECTIONS WARNING! TECNAIR LV tests water components with dried compressed air at 24 Bar. This ensures that no water is present in the water circuits thereby preventing the possibility of freezing during storage prior to installation. However, during the positioning and installation operations, it is essential to take special care not to fill the water circuits, even accidentally, before all the necessary antifreeze measures stipulated in the design specifications have been taken (e.g. -
Page 18: Water-Cooled Condensers
4.6.2 WATER-COOLED CONDENSERS On machines with integral water-cooled condensers, it will be necessary to install the supply and discharge lines to the condenser. The diameters of the pipes and the inlet and the outlet unions are indicated in the order confirmation. To ensure that circuit pipes are installed correctly, we recommend that the following indications are observed: •... -
Page 19: Water Coils
4.6.4 WATER COILS It will be necessary to install inlet and outlet pipes on both machines with chilled water coils and those with hot water coils. The diameters of the pipes and the inlet and the outlet unions are indicated in the order confirmation. The water inlet and outlet unions are indicated in the figure below. -
Page 20: Internal Immersed Electrode Humidifier
4.6.5 INTERNAL IMMERSED ELECTRODE HUMIDIFIER During installation of the unit it is necessary to connect a supply pipe (as shown in the figure) with the system characteristics indicated below. The discharge pipe is supplied ready-installed by Tecnair LB. The water connection should satisfy the following conditions: •... -
Page 21: Refrigerant Circuit Connections
REFRIGERANT CIRCUIT CONNECTIONS The pipes must be made from Gelidus type copper, soft annealed for pipes with diameters 26 - 28, and hard drawn for larger diameter pipes. To prevent copper dust or swarf from getting into the system, the pipes should be cut using a pipe cutter rather than a hacksaw. -
Page 22: Solenoid Valve On The Liquid Line
4.7.4 SOLENOID VALVE ON THE LIQUID LINE The scroll compressors installed on TECNAIR LV air conditioners will not be damaged by the presence of any liquid refrigerant in the crankcase. However, when the refrigeration circuit is shutdown in the summer season, i.e. when the external temperature is just a few degrees higher than the internal temperature, the liquid refrigerant flows towards the compressor (the coldest point of the circuit) and, depending on the quantity of refrigerant in the system, floods it partially or completely. -
Page 23: Very Low External Temperature Kit
4.7.5 VERY LOW EXTERNAL TEMPERATURE KIT CEA air-cooled condensers, combined with Tecnair LV direct expansion air conditioners, are equipped as standard with air condensation pressure control via reduction of the air flow rate in accordance with the reduction in the condensation pressure. -
Page 24: Routing Of The Refrigerant Circuit Pipes
4.7.6 ROUTING OF THE REFRIGERANT CIRCUIT PIPES Correct routing of the refrigerant circuit pipes is essential to the successful operation of the air conditioner. It is necessary to take special care in the selection and positioning of the compressor discharge and suction pipes, above all when these lines are relatively long and in particular: •... -
Page 25: Diameters Of Refrigerant Circuit Connection Pipes
4.7.7 DIAMETERS OF REFRIGERANT CIRCUIT CONNECTION PIPES Use the following table to determine the recommended diameters for the supply and return pipes in accordance with the machine size (given by the numerical sequence in the product code). The values in the columns for pipe lengths up to 30m are also valid for longer lengths and do not need to be increased. -
Page 26: Completion Of The Refrigerant Charge
4.7.8 COMPLETION OF THE REFRIGERANT CHARGE • Direct expansion air conditioners are shipped pressurised with a nitrogen charge. • Air-cooled condensers are shipped pressurised with a nitrogen charge. • Machines with internal water-cooled condensers are supplied fully charged with refrigerant To charge the refrigerant circuit/s of a machine, it is necessary to consider that the total quantity of refrigerant required for a direct expansion unit equipped with remote condenser is determined by the summing the refrigerant contents of each individual component in the circuit. - Page 27 Air-cooled condensers with CEA axial fans: Contents of refrigerant Model Contents of refrigerant circuit (kg) Model circuit (kg) CEA 21c H/V 0,66 CEA 91c H/V CEA 21c/LN H/V CEA 101c H/V CEA 31c H/V CEA 101c/LN H/V 1,32 CEA 31c/LN H/V CEA 111c H/V CEA 41c H/V 1,32...
-
Page 28: Pressure Regulator Of Cea Condensers
4.7.9 PRESSURE REGULATOR OF CEA CONDENSERS On completion of the installation of the condenser refrigerant connections, return the control panel to the vertical position to ensure a weatherproof seal, as shown in the figures below. The next tasks are to make the electrical connections and adjust the condensation pressure by way of the relative screw so that the condensation temperature, as read on the gauges, stabilises around 45 °C;... -
Page 29: Electrical Connections
ELECTRICAL CONNECTIONS WARNING! BEFORE CARRYING OUT ANY OPERATIONS ON THE UNIT, SET THE MAIN SWITCH TO POSITION “O” The external electrical connections of the air conditioner must satisfy the following prescriptions: • They must be suitably dimensioned to withstand the maximum load in Amperes indicated on the electrical wiring diagram and on the data plate located inside the electrical compartment of the unit itself. -
Page 30: Installation Of The Remote Control Interface
4.8.1 INSTALLATION OF THE REMOTE CONTROL INTERFACE If the complete terminal or reduced version is to be panel or recess mounted, the maximum thickness of the panel must be 6 mm; if the terminal is to recessed mounted in a wall, a masonry box with internal dimensions sufficient to accommodate the terminal and the connection cables must be provided. -
Page 31: Installation Of The Remote Control Terminal At A Distance Of Over 50 M
4.8.2 INSTALLATION OF THE REMOTE CONTROL TERMINAL AT A DISTANCE OF OVER 50 M If the remote control terminal has to be installed at a distance of more than 50 m (up to a maximum of 200 m), two TCON6 boards must be used and connected together using a shielded AWG20/22 cable, as shown in the figure below. -
Page 32: Checks And First Startup
CHECKS AND FIRST STARTUP WARNING! BEFORE CARRYING OUT ANY OPERATIONS ON THE UNIT, SET THE MAIN SWITCH TO POSITION “O” Before the Manufacturer’s personnel proceed with the testing and startup of the machines, the checks listed in the following form must be carried out. DATE PLACE OPERATOR’S SIGNATURE... - Page 33 Check that support brackets are installed on the discharge pipe every 3 m and are not too tight so as to allow expansion of the pipe. Check that the refrigerant circuit valves are open, including the valve on the hot gas injection pipe. Check the electrical connections to the condenser disconnect switch.
- Page 34 ELECTRICAL POWER SUPPLY CHECKS DESCRIPTION POSITIVE NEGATIVE Check the connection of the three phases, neutral and earth. Check that the power supply voltage and frequency are within the tolerance limits of +/- 10%. CHECKS FOR AMBIENT SENSOR AND REMOTE TERMINAL CONNECTIONS (IF PRESENT) DESCRIPTION POSITIVE NEGATIVE...
-
Page 35: Deactivation, Disassembly And Scrapping
DEACTIVATION, DISASSEMBLY AND SCRAPPING WARNING! BEFORE CARRYING OUT ANY OPERATIONS ON THE UNIT, SET THE MAIN SWITCH TO POSITION “O” TECNAIR LV air conditioners must only be dismantled by specialised technical personnel. In any case, the following points must be observed: •... -
Page 36: Use Of The Air Conditioning Unit
USE OF THE AIR CONDITIONING UNIT TEMPERATURE CONTROL The heating and cooling devices are controlled in accordance with the temperature readings measured by the ambient sensor (or return air sensor) This temperature reading is compared with the set-point temperature, and the heating and cooling devices are activated according to the difference between these temperature values. -
Page 37: Direct Expansion Air Conditioners
7.1.4 DIRECT EXPANSION AIR CONDITIONERS • AIR CONDITIONER WITH A SINGLE COMPRESSOR • AIR CONDITIONER WITH TWO COMPRESSORS 7.1.5 CHILLED WATER AIR CONDITIONER 7.1.6 HEATING WATER COILS Manual code 75803707A.0708 Page 37 of 64... -
Page 38: Cooling Capacity Control With Hot Gas Injection Valve
7.1.7 COOLING CAPACITY CONTROL WITH HOT GAS INJECTION VALVE Control of cooling capacity is achieved through an electronic hot gas injection system. Injection of hot gas downstream of the thermostatic valve reduces cooling capacity in proportion to the request from the control system. With this system it is possible to modulate the cooling capacity between 50% and 100% of the rated capacity, and obtain a corresponding reduction in power consumption. -
Page 39: Supply Air Temperature Control (Limit)
SUPPLY AIR TEMPERATURE CONTROL (LIMIT) 7.2.1 µAC MICROPROCESSOR With the µAC microprocessor control it is possible to install a supply sensor (limit) for display of the supply temperature and control of the relative low supply temperature alarm. Below the set limit, the cold components will be progressively deactivated at temperature intervals of 3 °C. In dehumidification, low supply temperature control is not available. -
Page 40: Humidity Control
HUMIDITY CONTROL Humidification control action is effected proportionally by way of the following components: • Integrated immersed electrode humidifier • External humidifier (not supplied by TECNAIR LV) Proportional control provides a modulating effect on the quantity of steam produced, which in the case of the integrated humidifier ranges from to 8 to 100% of the total production, for both types of microprocessor control. -
Page 41: Chilled Water Air Conditioner
7.3.2 CHILLED WATER AIR CONDITIONER 7.3.3 SIMULTANEOUS HUMIDIFICATION AND COOLING Cooling the air increases its relative humidity until it reaches saturation point. It is clear that the air’s capacity to absorb vapour depends on its relative humidity and falls to zero near saturation point. Attempting to humidify air in these conditions, i.e. -
Page 42: Ventilation
VENTILATION FANS WITH 5-SPEED AUTO-TRANSFORMER If it is expected that it will be necessary to vary the air flow rate during startup or use of the air conditioner, an auto-transformer may be installed to regulate the fan motor input voltage and thus the fan speed. The auto-transformer affords the possibility to reduce the fan speed in 3 to 5 steps. -
Page 43: Control Of Air Flow Rate According To Cooling Capacity
8.2.3 CONTROL OF AIR FLOW RATE ACCORDING TO COOLING CAPACITY The pCO controls the fans so as to modulate the air flow rate in accordance with the cooling capacity requested by the system. This can make for significant energy savings and a reduction in noise levels, particularly when operating with partial loads. -
Page 44: Free Cooling And Twin Sources (Pco)
FREE COOLING AND TWIN SOURCES (pCO) WATER FREE COOLING The “Water Free Cooling” system installed on OCA…/FC - UCA…?/FC conditioners consists of an additional cold water coil, integrated in the machine’s finned evaporator coil pack, and a 3-way moudulating valve controlled by the microprocessor control. -
Page 45: Direct Expansion Twin Sources
DIRECT EXPANSION TWIN SOURCES The “Direct Expansion Twin Sources” system installed on OCA…/TS - UCA…?/TS conditioners consists of an additional cold water coil, integrated in the machine’s finned evaporator coil pack, and a 3-way modulating valve controlled by the microprocessor control. With this operating system, the compressors do not start as long as the cooling capacity of the chilled water system remains available. -
Page 46: Water Chilled Twin Sources
WATER CHILLED TWIN SOURCES The “Water chilled Twin Sources” system installed on conditioners OCU…?/TS -? UCU…?/TS consists of an additional cold water coil, integrated in the machine’s finned evaporator coil pack, and a 3-way modulating valve controlled by the microprocessor control. In this operating system, the second water circuit does not enter into operation as long as the cooling capacity of the chilled water system remains available. -
Page 47: Local Network
LOCAL NETWORK 10.1 MASTER - SLAVE LOCAL NETWORK Provides increased operating security in rooms where this is necessary through the Master - Slave configuration. In this type of local network the units are all activated with the exception of one designated slave unit, which remains on standby. -
Page 48: Routine And Major Maintenance
ROUTINE AND MAJOR MAINTENANCE WARNING! BEFORE CARRYING OUT ANY OPERATIONS ON THE UNIT, SET THE MAIN SWITCH TO POSITION “O” 11.1 PROGRAMMED MAINTENANCE CHART The recommended unit maintenance programme is summarised in the following chart: CHECK EVERY COMPONENTS Check general condition: corrosion, mountings, cleanliness Check motor noise FANS Check the rotor: vibration, imbalance... - Page 49 Check the unit is receiving power correctly Check the electrical connections ELECTRICAL PANEL Check the power consumptions of electrical components Test safety devices Renew protection fuses Check circuits for leaks Bleed air from circuits Check circuit temperatures and pressures WATER CIRCUITS Check operation of the 3-way valve Check the quantity of glycol in the circuit Check the water circulates correctly...
-
Page 50: Maintenance Of The Fans
11.2 MAINTENANCE OF THE FANS Fan maintenance operations must be carried out in conditions of maximum safety and always with the unit switched off During maintenance, check the following: • Periodically check that the fan blades are clean and remove all dirt and encrusted deposits that could affect the balance of the rotor and thus damage the bearings. -
Page 51: Maintenance Of Cea Air-Cooled Condensers
11.7 MAINTENANCE OF CEA AIR-COOLED CONDENSERS Air-cooled condensers require regular inspection of the evaporator coils, which should be cleaned if the cooling fins become clogged with dirt. It is also necessary to check the fan power draw as well as check for abnormal fan noise and the condition of the speed control. -
Page 52: Fault Diagnosis
FAULT DIAGNOSIS WARNING! BEFORE CARRYING OUT ANY OPERATIONS ON THE UNIT, SET THE MAIN SWITCH TO POSITION “O” This chapter contains information to assist the operator in tracing any faults that may arise with the machine Starting from a description of the nature of the problem, we provide indications on the probable causes and possible remedies. -
Page 53: Direct Expansion Air Conditioners - Refrigeration Circuit Problems
12.1 DIRECT EXPANSION AIR CONDITIONERS - REFRIGERATION CIRCUIT PROBLEMS LOW PRESSURE LACK OF LOCK COMPRESSION REFRIGERATION THERMOSTAT LOW AIR FLOW CIRCUIT NOT VALVE FAULTY MECHANICAL VALVES CONDENSATIO THROUGH CHARGED N PRESSURE FAILURE BROKEN EVAPORATOR CHECK DISCONNECT TRACE THE REPLACE CONDENSATION COMPRESSOR LEAK AND CONTROL SYSTEM... - Page 54 HIGH PRESSURE LOCK WATER COOLED COOLED COND. COND AIR INLET REFRIGERATION AIR FLOW TO FAN FAILS TO TEMPERATURE CONDENSER TOO OPERATE CIRCUIT OVER- TOO HIGH CHARGED CHECK COIL FOR MEASURE AIR ELIMINATE CHECK EFFICIENCY CHECK THERMAL CHECK AND POSSIBLE TEMPERATURE POSSIBLE OF CONDENSATION PROTECTIONS...
-
Page 55: Chilled Water Air Conditioner - Water Circuit Problems
12.2 CHILLED WATER AIR CONDITIONER - WATER CIRCUIT PROBLEMS NO COOLING WATER AIR IN CIRCUIT 3-WAY VALVE TEMPERATURE AT FAILS TO EVAPORATOR OPEN OUTLET TOO HIGH CHECK AND CHECK REFRIGERATION BLEED AIR FROM SYSTEM AND RETURN CIRCUIT TEMPERATURE TO DESIGN CONDITIONS CHECK FOR CHECK ELECTRONIC... -
Page 56: Heating Section Problems
12.3 HEATING SECTION PROBLEMS HEATING POST- HEATING TO WATER CONDITIONS POST-HEATING NO SERVO NO HOT GAS CONTROL FUNCTIONS THERMAL SAFETY MAGNETIC THERMOSTAT PROTECTION TRIPPED TRIPPED CHECK POWER SUPPLY AND MODULATING SIGNAL WATER VALVE FAILED TEMPERATURE TO OPEN SHORT CIRCUIT IN HIGH TOO LOW HEATER... -
Page 57: Dehumidification Problems
12.4 DEHUMIDIFICATION PROBLEMS DEHUMIDIFICATION DIRECT CHILLED EXPANS. WATER HIGH AIR FLOW COMPRESSOR HIGH AIR HIGH WATER VALVE FAILS RATE FAILS TO START FLOW RATE TEMPERATURE TO OPEN CHECK ENABLE RETURN TO RETURN TO CHECK POWER CHECK OPERATION SIGNALS ON DESIGN DESIGN SUPPLY ON OF SERVO MOTOR... - Page 58 EXCESSIVE DEHUMIDIFICATION AIR FLOW CHILLED TOO LOW DIRECT WATER EXPANSION EVAPORATION WATER TEMPERATURE TEMPERATURE TOO LOW TOO LOW CHECK IF FAN CHECK FAN CHECK IF FAN IS CLEAN CHECK AIR THERMAL ELECTRICAL BLOCKED THE FILTERS CIRCUIT PROTECTION HAS CONNECTIONS TRIPPED CHECK OPERATION CHECK CHECK THAT THE...
-
Page 59: Ventilation Problems
12.5 VENTILATION PROBLEMS NO AIR FLOW THERMAL PROT. TRIPPED FLOW CONTROL FOR CURRENT SWITCH STUCK OVERLOAD NO AIR OPERATION WITH FILTERS MECHANICAL PANELS OPEN DIRTY FAILURE CLOSE THE CLEAN PANELS THE FILTERS CHECK CHECK AIR CALIBRATION AND CIRCUIT AND FUNCTIONALITY OF THE MECHANISM DIRECTION OF... -
Page 60: Glossary
GLOSSARY • Proportional band: defines a temperature range of just a few degrees starting from the setpoint, within which the system operates the control devices. • Default: this term is used to describe the values (e.g. set-point and proportional band values) that will be automatically applied by the system if the operator fails to set them. -
Page 61: Notes
NOTES Manual code 75803707A.0708 Page 61 of 64... - Page 62 Manual code 75803707A.0708 Page 62 of 64...
- Page 63 Manual code 75803707A.0708 Page 63 of 64...
- Page 64 Manual code 75803707A.0708 Page 64 of 64...
Need help?
Do you have a question about the TECNAIR LV C Series and is the answer not in the manual?
Questions and answers