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Summary of Contents for Lennox EMEA INNOV CD-CU-CX
- Page 1 INSTALLATION, USE AND MAINTENANCE MANUAL INNOV@ DHF Chilled water CD-CU-CX Air Conditioning Units for Close Control Application INNOV@-DHF-IOM-0922-EN www.lennoxemea.com...
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Page 3: Table Of Contents
1 General description Structure Application limits Cooling circuit Installation warnings 2 Inspection / Transport / Positioning Inspection on receipt Lifting and transport Unpacking Positioning 3 Installation 4 Supply water properties 5 Humidifier 6 Electrical connections Generalities 7 Operating diagrams 8 Start-Up Preliminary checks Starting operations 9 Setting operating parameters... -
Page 4: General Description
General description DH_C CCAC chilled water units are specially designed for installation in technological environments such as Computer rooms, laboratories and in general where a high precision in climate control and a 24h/day operation are requested. TREF units represent the state of the art between technology and design as well as all ours. products. - Page 5 Table 1 DH synoptic. Unit name Close control unit Size Cooling capacity [kW] at the nominal working conditions . . . Configuration High water flow configuration Middle water flow configuration Low water flow configuration Execution Chilled water unit Air flow Downflow unit Upflow unit Displacement unit...
- Page 6 Figure 1 Downflow unit components. DH_CD Table 2 Position Description Position Description Chilled water coil Water valve Air filter Stainless steel drain pan Electrical pane Electrical heaters Humidifier INNOV@-DHF-IOM-0922-EN • 6•...
- Page 7 Figure 2 Displacement unit components. DH_CX Table 3 Position Description Position Description Chilled water coil Water valve Air filter Stainless steel drain pan Electrical pane •7• INNOV@-DHF-IOM-0922-EN...
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Page 8: Structure
Structure DH units are designed with a self-supporting frame and all components are produced using sophisticated computer driven machines and special tools. All sheet metals are galvanized, and all external panels are powder coated RAL 7016 giving to the units the image and the quality like last generation of IT devices. - Page 9 Electric control board 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 turned off. All the remote controls use 24 V signals powered by an insulating transformer situated on the electric control board.
- Page 10 Figure 3 Base refrigerant circuit. 3-way valve 2-way valve (optional) Table 5 Riferimento Descrizione Riferimento Descrizione Inlet chilled water Chilled water coil Relief valve Water valve Outlet chilled water INNOV@-DHF-IOM-0922-EN • 10•...
- Page 11 Figure 4 Base refrigerant double circuit (optional). Valvola 3-vie Valvola 2-vie (opzionale) Table 6 Riferimento Descrizione Riferimento Descrizione Inlet chilled water Chilled water coil Relief valve Water valve Outlet chilled water •11• INNOV@-DHF-IOM-0922-EN...
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Page 12: Installation Warnings
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 13: Inspection / Transport / Positioning
Inspection / Transport / Positioning 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”... -
Page 14: Installation
Installation The DH 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. Figure 5 Service area. - Page 15 Table 8 Service area for upflow units. DH_CU A [mm] B [mm] C [mm] D [mm] E [mm] 1010 2000 1270 2000 1760 2000 2020 2000 2510 2000 3160 2000 Table 9 Service area for displacement units. DH_CX A [mm] B [mm] C [mm] D [mm]...
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Page 16: Supply Water Properties
Supply water properties The quality and chemical composition of the cooling and heat transfer medium have a great influence on the Lifetime and on heat transfer and thus on the performance of the specific unit. Basically, avoid all types of floating matter in the cooling and heat transfer medium. When the suspended matter accumulates in the heat exchanger the heat transfer and thus the performance of the unit deteriorate. - Page 17 Ammonia < 0.5 Temperature < 65 °C Oxygen content < 0.1 Generally, a low pH value (less than 6) increases the risk of corrosion, and a high pH (above 7.5) decreases the risk of corrosion. e Mn are powerful oxidants and may increase the risk of localized corrosion on stainless steel. •17•...
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Page 18: Humidifier
Humidifier The installation of the humidifier requires the connection to the water supply and drain hoses. Figure 6 Humidifier. To simplify installation, it is recommended to use hose with an inside diameter of 6 mm and an outside diameter of 8 mm and the revolving 3/4” G connection, either straight or 90°. A shut-off tap and a mechanical filter should be installed to trap any solid impurities. - Page 19 • Presence of a mechanical filter in the supply water line; • Water temperature and pressure within the allowed values; • Drain hose resistant to temperatures of 100°C; • Minimum inside diameter of the drain hose of 25 mm; • Minimum slope of the drain hose greater than or equal to 5°; •...
- Page 20 Residual chlorine mg/l Calcium sulphate CaSO mg/l Metallic impurities mg/l Solvents, diluents, soaps, lubricants mg/l Values depending on specific conductivity; in general: TDS ≅ 0.93 * σ ≅ 0.65 * σ Not lower than 200% of the chloride content in mg/l of Cl Not lower than 300% of the chloride content in mg/l of Cl Table 12 Limit values for the supply water with medium-low conductivity I the immersed electrode humidifier.
- Page 21 WARNING No relation can be demonstrated between water hardness and conductivity. WARNING Do not treat water with softeners! This could cause corrosion of the electrodes or the formation of foam, leading to potential operating problems or failures. Avoid: • Using well water, industrial water or water drawn from cooling circuits; in general, avoid using potentially contaminated water, either from a chemical or bacteriological point of view;...
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Page 22: Electrical Connections
Electrical connections Generalities WARNING 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”... - Page 23 between the protective ground “PE” and the mains connection. The protective earth is conducting high discharge currents (dependent on the switching frequency, current source voltage and motor capacity). Earthing in compliance with EN specifications shall therefore be observed even for testing and trial conditions (EN 50 178, Art.5.2.11).
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Page 24: Operating Diagrams
Operating diagrams Figure 7 Air flow. DH_CD DH_CU DH_CX INNOV@-DHF-IOM-0922-EN • 24•... -
Page 25: Start-Up
Start-Up 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 yearly inspection. Starting operations Before starting the unit, turn the main switch on, select the operating mode desired from the control panel and press the ”ON”... -
Page 26: Setting Operating Parameters
Setting operating parameters 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 you can perform a check on the operating and safety devices. The settings are shown in Table 13. WARNING All servicing of the equipment is to be considered extraordinary maintenance and may be carried out BY QUALIFIED TECHNICIANS ONLY: incorrect settings may cause... -
Page 27: 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. 10.1 Warnings WARNING All the operations described in this chapter MUST ALWAYS BE PERFORMED BY... -
Page 28: 10.2 Generalities
10.2 Generalities To guarantee a constantly satisfactory performance over time, it is advisable to carry out routine maintenance and checks as described below. The indications below are related to standard tear and wear. Table 14 Routine maintenance. Operation Frequency Check the efficiency of all the control and safety devices Once a year Check the terminals on the electric control board to ensure that they are securely tightened. - Page 29 Figure 9 Inspecting the air filters in displacement units. DH_CX • Open the air filter compartment located in the plenum on the unit; • Pull out the air filters; • Check the condition of the filters and replace it if necessary. Figure 10 Relief valves in downflow units.
- Page 30 Figure 11 Relief valves in displacement units. DH_CX • The relief valves are accessible on frontal side. INNOV@-DHF-IOM-0922-EN • 30•...
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Page 31: Troubleshooting
Troubleshooting On the next pages you will find a list of the most common reasons that may cause the package unit to fail or any malfunction. This causes are broken down according to easily identifiable symptoms. WARNING 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 32 AGENCES COMMERCIALES : BELGIQUE ET LUXEMBOURG POLOGNE + 32 3 633 3045 + 32 3 633 3045 +48 22 58 48 610 +351 229 066 050 FRANCE PORTUGAL +33 1 64 76 23 23 +33 1 64 76 23 23 +351 229 066 050 +7 495 626 56 53 ALLEMAGNE...
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