tcaes 230Ã·4160 thae - Rhoss

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SECTION II: INSTALLATION AND MAINTENANCE II.1.11 STORAGE CONDITIONS The units are wrapped in a shrink-wrap nylon sheath which guarantees protection when the unit is stored in sheltered areas where it is not exposed to frequent changes in temperature. If the appliance has to be stored outdoors, remove the shrink-wrap nylon sheath to avoid the formation of condensate. If the unit is exposed to sunlight, peel off the protective film on the panelling. II.2 INSTALLING THE UNIT DANGER! Installation may only be carried out by skilled technicians, qualified to work with conditioning and cooling products. Installation personnel must comply with all applicable local or national legislation in effect when the appliance is commissioned. DANGER The corners of the unit and the finned surface of the banks may cause injury if the due care and attention is not paid during installation. II.2.1 CLEARANCES IMPORTANT! The unit must be positioned in compliance with the minimum recommended clearances and bearing in mind access to water and electrical connections. Failure to observe the recommended clearances during installation will prevent the unit from running efficiently, causing an increase in the power input and a considerable drop in the cooling power due to an increase in condensing pressure. The area above the unit must be free of any obstacles. If the unit is completely surrounded by walls, the indicated distances still apply as long as two adjacent walls are no higher than the unit itself. If more than one unit is installed, a 2 m minimum distance must be provided between the finned coils to avoid interference with the condensing/ventilating modules of each machine. Clearances greater than the clearances indicated in Fig. 5 and Fig. 6 must be taken into account to allow for handling any components that may require replacement. Fig. 6 MODEL 470 490 4100 4110 4130 4140 4160 Clearances L1 mm 1.200 1.200 1.200 1.200 1.200 1.200 1.200 L2 mm 1.400 1.400 1.400 1.600 1.600 1.600 1.600 L3 mm 800 800 800 800 800 800 800 II.2.2 WEIGHT DISTRIBUTION IMPORTANT! Correct installation and positioning includes levelling the appliance on a surface capable of bearing its weight. The unit may be installed at ground level or on the top of buildings. If the unit is installed on structures that may not be subjected to the effects of mechanical vibrations, the appliance must be insulated from the rigid support surface. Alternatively, the danger of transmitting vibrations through the support surface can be eliminated by installing vibration-damping rubber supports into the points provided under the frame of the unit. The vibration-damping rubber supports are supplied as accessories (KSA: vibration-damping supports). The weight of each unit is indicated in the tables in enclosed documents 1, 2, and 3. IMPORTANT! If the problem of structural vibration transmission proves difficult to solve, consult a qualified technician for a complete analysis. II.2.3 II.2.3.1 WATER CONNECTIONS Connection to the system IMPORTANT! The water system and connection between the unit and the system must be carried out in compliance with the local and national regulations in effect. Fig. 5 MODEL 230 235 245 250 260 Clearances L1 mm 1.000 1.000 1.000 1.000 1.000 L2 mm 800 800 800 800 800 L3 mm 800 800 800 800 800 The units feature 2”G male threaded water connections. Air vents and on-off valves must be installed on the inlet and outlet pipes of the unit to isolate the appliance from the rest of the system. This not only allows the heat exchanger to be emptied but also leaves enough space for any maintenance work or the removal of the heat exchanger. A filter must be assembled on the system return pipe and vibration-damping joints must be installed on the water connections. When all the connections have been carried out, make sure that none of the pipes have any leaks and bleed any air from the circuit. II.2.3.2 Installation and management of the P/P –DP circulation pump on the primary circuit The circulation pump installed on the chilled water circuit must be able to overcome, at the rated flow rate, the flow resistance of the entire system and the exchanger on the appliance. • The differential pressure switch protects the unit from any interruptions in the flow of water. The differential pressure switch is automatically rearmed; the unit automatically starts up again only when the water flow rate exceeds the calibrated differential set point. • Once the differential pressure switch has been triggered, the control panel continues to display the E41 alarm to indicate possible water system problems (Par. II.3.6). 10
SECTION II: INSTALLATION AND MAINTENANCE • The service pump must be subordinate to the appliance; the microprocessor controller controls and manages the pump according to the following logic: When the machine is switched on, the pump is the first device to start up; the pump has priority over the rest of the system. During the start up phase, the differential pressure switch for the minimum water flow rate is ignored for a pre-set time, to avoid oscillations caused by air bubbles or turbulence in the water circuit. When this pre-set delay time expires, definitive machine start-up is enabled and the fans are activated 60 seconds after the pump has switched on (during this stage the antifreeze alarm is bypassed). After another 60 second safety delay time, the compressors start up. The pump runs in strict unison with the appliance and is only cut-out when the unit is switched off. When the machine is switched off, the pump continues to function for a pre-set time before coming to a definite stop to eliminate any residual heat in the water evaporator. Information regarding pump water connections is outlined in enclosed document 4, which also includes the hook-up diagrams for each machine version. If a double stand-by pump (P-P/DP) is present, the second pump is connected in parallel to the first pump and can be activated if the working pump malfunctions or breaks-down by acting on a selector on the control board. II.2.3.3 Frost protection II.2.3.3.1 When the unit is switched off or during seasonal breaks IMPORTANT! If the unit is not used during the winter months, the water in the system may freeze and therefore seriously damage the appliance. The entire contents of the circuit should be emptied before the onset of winter. Use a discharge point below the water exchanger to assure all the water is drained from the unit. Act on the cocks on the bottom part of the exchangers to make sure the exchangers are completely empty. If it is not possible to discharge the water from the system, ethylene glycol may be added to the water. If proportioned correctly, ethylene glycol prevents the water from freezing. II.2.3.3.2 While the unit is running In this case the microprocessor control prevents the exchanger from freezing. When the set temperature is reached the antifreeze alarm triggers and stops the appliance, while the circulation pump continues to run normally. The use of ethylene glycol is only recommended when it is not possible to discharge the water from the circuit during the winter break or if the unit has to produce chilled water at temperatures below 4°C (the latter case is not covered herein and depends on the system sizing of the unit). IMPORTANT! Mixing the water with glycol modifies the performance of the unit. The following table indicates the multiplication factors needed to determine the variations in performance of the units according to the required percentage of ethylene glycol. The multiplication factors refer to the following conditions: condenser inlet air temperature: 32°C; chilled water temperature: 7°C; temperature differential at the evaporator: 5°C; (the same multiplication factors may be used for different working conditions because their degree of variation is negligible). Table TCAE-TCAES-THAE-THAES 230÷4160 Min. outdoor air 2 0 -3 -6 -10 -15 -20 temperature °C % of glycol in weight 10 15 20 25 30 35 40 Freezing temperature in -5 -7 -10 -13 -16 -20 -25 °C fc G 1,008 1,028 1,051 1,074 1,100 1,126 1,153 fc ∆pw 1,053 1,105 1,184 1,237 1,316 1,421 1,500 fc QF 0,991 0,987 0,982 0,978 0,974 0,969 0,960 fc P 0,996 0,995 0,993 0,991 0,989 0,987 0,984 Key to table: fc G = Evaporator glycol water flow rate correction factor (condenser/evaporator on THAE-THAES). fc ∆pw= Evaporator flow resistance correction factor (condenser/evaporator on THAE-THAES). fc QF = Cooling capacity correction factor. fc P = Total power input correction factor. II.2.3.4 System water content Systems supplied by water chillers usually have limited water volumes/capacities. In these working conditions (particularly with reduced heat loads), the compressor would be forced to start and stop at too frequent intervals. The microprocessor board protects the electric motor on the compressor by delaying the next compressor start-up by 360 seconds once it has stopped. This undermines the efficiency of the system connected to the unit because the chilled water may be subjected to excessive temperature variations. We recommend installing an inertial water storage tank which will, when necessary, increase the amount of water in the circuit thus drastically limiting the effect of the water temperature variations. The volume of the storage tank depends on the type of system, the capacity of the cooling assembly, the temperature differential of each capacity control step in the working thermostat. On the basis of the desired inertial effect on the water temperature, the total quantity of water Q (I), (system + storage), may be calculated as follows: P (kW) ∆T (°C) t (sec.) Q(l) = 860⋅ P t 1 ⋅ ⋅ ∆T n 3600 = Project cooling capacity. = Working thermostat differential (2 ÷ 6°C). = Compressor stop time (the delay time is managed by the microprocessor; to determine the minimum water quantity to limit the temperature variations when in use, set t=100 sec., + 60 sec. for every minute of delay required). n (n°) = Number of capacity control steps. The storage tank should be downstream of the cooling circuit and upstream of the cooling. This means that the water temperature in the terminal units is reached as soon as the compressor starts working. While the compressor is running the water temperature may fall slightly below the project value. II.2.4 ELECTRICAL CONNECTIONS DANGER! Electrical connection must be carried out by qualified personnel in compliance with the regulations in effect in the country where the unit is installed. RHOSS shall not be held liable for damage to persons or things caused by incorrect electrical connection. IMPORTANT! When carrying out electrical connections, refer to the wiring diagrams enclosed with the unit which highlight the terminals which need to be set up by the installer. The control board on the units is equipped with a general isolator with door interlock. • Connections must be carried out in compliance with the local and national regulations in effect and the wiring diagrams supplied with the appliance. • By law the unit must be earthed. Earth connection must be carried out during installation using the terminal marked with the “PE” earth sign. • Always install a general isolator in a protected area near the appliance with a delayed characteristic curve of a suitable capacity and breaking capacity. Make sure the general isolator includes a 3mm minimum distance between contact apertures. • Power supply must be provided by a three phase line using a threepole + neutral cable suitably sized in relation to the power input of the appliance. The power supply cables must be routed through the external raceway indicated in Enclosed Documents 1, 2, 3. • The units are supplied with the remote on-off parameter enabled. 11
Page 1 and 2: ISTRUZIONI PER L’USO INSTRUCTIONS
Page 3 and 4: INDEX INDEX KEY TO SYMBOLS I SECTIO
Page 5 and 6: SECTION I: USER I.1.4.2 Identificat
Page 7 and 8: SECTION I: USER I.3.8 STATUS INDICA
Page 9: SECTION II: INSTALLATION AND MAINTE
Page 13 and 14: SECTION II: INSTALLATION AND MAINTE
Page 23 and 24: ENCLOSED DOCUMENTS A2 GEOMETRICAL F
Page 25 and 26: ENCLOSED DOCUMENTS A4 HOOK-UP DIAGR
Page 27 and 28: A5 TECHNICAL FEATURES ENCLOSED DOCU
Page 29 and 30: NOTES ………………………
Page 31 and 32: NOTES NOTES …………………

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