HWA Water Chillers ONLY COOLING, HEAT PUMP AND FREE
Contents
1. MODEL 130FS 130FL 150FS 150FL 180FS 180FL 205FS 205FL FRAME 4 4 4 5 5 5 5 5 Total kg 222 2 222 2 222 2 224 1 231 3 231 3 231 3 231 3 L1 33 33 33 33 33 33 33 615 34 695 34 695 34 695 34 695 L2 33 33 33 33 33 33 33 615 34 695 34 695 34 695 34 695 L3 22 22 22 22 22 22 22 41 23 13 23 13 23 13 23 13 L4 22 22 22 22 22 22 22 41 23 13 23 13 23 13 23 13 L5 33 33 33 33 33 33 33 615 34 695 34 695 34 695 34 695 L6 33 33 33 33 33 33 33 615 34 695 34 695 34 695 34 695 L7 22 22 22 22 22 22 22 41 23 13 23 13 23 13 23 13 L8 22 22 22 22 22 22 22 41 23 13 23 13 23 13 23 13 MODEL 220FS 220FL 235FS 235FL 250FS 250FL 280FS 300FS FRAME 5 6 5 6 6 6 6 6 Total kg 231 3 233 5 231 3 233 5 237 7 237 7 237 7 237 7 L1 34 695 35 025 34 695 35 025 35 655 35 655 35 655 35 655 L2 34 695 35 025 34 695 35 025 35 655 35 655 35 655 35 655 L3 23 13 23 35 23 13 23 35 23 77 23 77 23 77 23 77 L4 23 13 23 35 23 13 23 35 23 77 23 77 23 77 23 77 L5 34 695 35 025 34 695 35 025 35 655 35 655 35 655 35 655 L6 34 695 35 025 34 695 35 025 35 655 35 655 35 655 35 655 L7 23 13 23 35 23 13 23 35 23 77 23 77 23 77 23 77 L8 23 13 23 35 23 13 23 35 23 77 23 77 23 77 23 77 Weights with 1 pump to be added to Free Cooling STD weight MODEL 045FS 045FL 050FS 050FL 060FS 060FL 070FS 070FL FRAME 1 2 1 2 2 2 2 2 Total kg 139 2 163 2 139 2 163 2 168 4 168 4 168 4 168 4 L1 41 76 28 56 41 76 28 56 29 47 29 47 29 47 29 47 L2 41 76 28 56 41 76 28 56 29 47 29 47 29 47 29 47 L3 272. 15 in all operating conditions The compressors often work intermittently since the chilling requirements of the user generally do not coincide with the compressor output In systems containing little water where the thermal inertia of the water itself is lower it is a good idea to check that the water content in the section delivering to users satisfies the condition below COXAT pXShx ATx Ns V water content in user section m3 Sh specific heat of the fluid J kg fluid density kg m3 minimum time lapse between 2 compressor restarts DT allowed water T differential Cc Cooling capacity of choking steps DL fd ce Q TW in Q TW out File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 9 A standard feature of HWA HWA F units is a device for controlling the flow rate flow switch or differential pressure switch in the water circuit in the immediate vicinity of the evaporator Frame 3 4 5 units include a blade type flow switch positioned in the ventilation compartment Any tampering with said device will immediately invalidate the warranty It is advisable to install a metal mesh filter on the inlet water pipe It is strongly recommended to install a safety valve in the water circuit In the event of serious equipment faults e g fire it will enable water to be drained from the system thereby preventing possible bursts Always connect the drain outlet
3. File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 28 im Low condensation pressure Transducer fault Check the transducers and the efficiencv of the needle pusher on the schrader valves thev are connected to Outdoor T too low and or presence Install the condensation control of strong winds device and or protect the unit from prevalent winds pump operation compatible with the unit s potential Low evaporation pressure Insufficient flow of water Check whether the pumps are rotating in the right direction Check the water system for pressure drops Check the efficiency of the system check valve optional Malfunctioning of thermostatic Warming the bulb with your hand valve check whether the valve opens and adjust it if necessary If it does not respond replace it Filter clogged Pressure drops upstream downstream from the filter should not exceed 2 If they do replace the filter Low condensation T Check the efficiency of the condensation control device where present Low level of refrigerant Check the refrigerant level by measuring the degree of undercooling if it is below 2C replenish the charge Coil covered with frost in the case Check whether the defrost of heat pump operation parameters have been properly set Check the efficiency of the 4 way valve Low outdoor T if the unit Check compliance with the operating with the heat pump on operating limits and eliminate any bypasses and ba
4. 7 5 STOPPING THE UNIT To stop the unit press the OFF unit on the front panel Warning do not stop the unit using the main switch the latter device serves to disconnect the unit from the electricity supply when there is no passage of current i e when the unit is already turned OFF Moreover if you completely disconnect the unit from the electricity supply the crankcase heating elements will receive no power thereby jeopardising the integrity of the compressor the next time the unit is started File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 15 8 OPERATING LIMITS Operating limits of HWA chillers in relation to the outlet water temperature and outdoor air temperature Min Max Temperature of water leaving evaporator C 5 30 12 45 Outdoor air temperature C 10 45 8 1 WATER FLOW TO EVAPORATOR The nominal flow rate is based on a thermal differential of 5 C between inlet and outlet water in relation to the cooling capacity provided at the nominal water 12 7 C and air 35 C temperatures The maximum allowed flow rate is associated with a thermal differential of 3 C higher flow rates though admissible cause pointless high drops in pressure The minimum allowed flow rate is associated with a thermal differential of 8 C or a minimum pressure drop of 10 kPa lower flow rates cause a reduction in heat exchange coefficients and excessively low evaporation temperatures w
5. 3 232 L3 51 356 51 356 15 642 15 642 15 642 16 02 16 02 42 016 42 016 L4 51 356 51 356 15 642 15 642 15 642 16 02 16 02 42 016 42 016 L5 46 926 46 926 46 926 48 06 48 06 3 232 3 232 L6 46 926 46 926 46 926 48 06 48 06 3 232 3 232 L7 32 32 32 32 L8 32 32 32 32 MODEL 130CS HS 130CL HL 150CS HS 150CL HL 180CS HS 180CL HL 205CS HS 205CL HL 220CS HS FRAME 4 4 4 4 4 5 5 5 5 Total kg 161 6 161 6 162 6 162 6 175 6 176 465 176 465 176 465 176 465 L1 3 232 3 232 3 252 3 252 3 512 3 5293 3 5293 3 5293 3 5293 L2 3 232 3 232 3 252 3 252 3 512 3 5293 3 5293 3 5293 3 5293 L3 42 016 42 016 42 276 42 276 45 656 45 8809 45 8809 45 8809 45 8809 L4 42 016 42 016 42 276 42 276 45 656 45 8809 45 8809 45 8809 45 8809 L5 3 232 3 232 3 252 3 252 3 512 3 5293 3 5293 3 5293 3 5293 L6 3 232 3 232 3 252 3 252 3 512 3 5293 3 5293 3 5293 3 5293 L7 32 32 32 32 32 52 32 52 35 12 35 293 35 293 35 293 35 293 L8 32 32 32 32 32 52 32 52 35 12 35 293 35 293 35 293 35 293 MODEL 220CL HL 235CS HS 235CL HL 250CS HS 250CL HL 280CS HS 280CL HL 300CS HS 300CL HL FRAME 5 5 5 6 6 6 6 6 6 Total kg 176 465 176 465 176 465 183 37 183 37 183 37 183 37 183 37 183 37 L1 3 5293 3 5293 3 5293 3 6674 3 6674 3 6674 3 6674 3 6674 3 6674 L2 3 5293 3 5293 3 5293 3 6674 3 6674 3 6674 3 6674 3 6674 3 6674 L3 45 8809 45 8809 45 8809 47 6762 47 6762 47 6762 47 6762 47 6762 47 6762 L4 45 8809 45 8809 45 8809 47 6762 47 6762 47 6762 47 6762 47 6762 47 6762 L5 3 5293 3 5293 3
6. 3 4 3 5 3 5 3 5 3 6 6 Inertial storage reservoir capacity dm 218 218 315 315 315 485 Expansion tank dm 8 8 8 8 8 12 Standard pump type C C C D D E Available head HWA with standard pump nominal flow rate kPa 137 131 126 143 138 146 Rated electrical output standard pump kW 1 50 1 50 1 50 2 20 2 20 3 00 Operating current standard pump A 4 3 4 3 4 3 5 3 5 3 6 6 Uprated pump type E F G G Available head HWA with uprated pump nominal flow rate kPa 217 264 258 238 279 281 Rated electrical output uprated pump kW 3 00 4 00 4 00 4 00 7 50 7 50 Operating current uprated pump A 6 6 9 6 9 6 9 6 16 0 16 0 Inertial storage reservoir capacity dm 485 600 600 600 600 765 Expansion tank dm 12 24 24 24 24 24 HWA 235 250 280 30 Standard pump type E E Available head HWA with standard pump nominal flow rate kPa 139 131 174 9 168 9 156 2 Rated electrical output standard pump kW 3 00 3 00 4 00 4 00 4 00 Operating current standard pump A 6 6 6 6 9 2 9 2 9 2 Uprated pump type G G H H H Available head HWA with uprated pump nominal flow rate kPa 278 261 292 6 286 6 273 9 Rated electrical output uprated pump kW 7 50 7 50 7 50 7 50 7 50 Operating current uprated pump A 16 0 16 0 15 5 155 15 5 Inertial storage reservoir capacity dm 765 765 765 765 765 Expansion tank dm 24 24 24 24 24 File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 39 LENNUX
7. 5 0893 5 0893 5 0893 5 0893 L7 39 32 39 32 39 52 39 52 47 12 50 893 50 893 50 893 50 893 L8 39 32 39 32 39 52 39 52 47 12 50 893 50 893 50 893 50 893 MODEL 220CL HL 235CS HS 235CL HL 250CS HS 250CL HL 280CS HS 280CL HL 300CS HS 300CL HL FRAME 5 5 5 6 6 6 6 6 6 Total kg 254 465 254 465 254 465 263 23 264 23 265 23 266 23 267 23 268 23 L1 5 0893 5 0893 5 0893 5 2646 5 2846 5 3046 5 3246 5 3446 5 3646 L2 5 0893 5 0893 5 0893 5 2646 5 2846 5 3046 5 3246 5 3446 5 3646 L3 66 1609 66 1609 66 1609 68 4398 68 6998 68 9598 69 2198 69 4798 69 7398 L4 66 1609 66 1609 66 1609 68 4398 68 6998 68 9598 69 2198 69 4798 69 7398 L5 5 0893 5 0893 5 0893 5 2646 5 2846 5 3046 5 3246 5 3446 5 3646 L6 5 0893 5 0893 5 0893 5 2646 5 2846 5 3046 5 3246 5 3446 5 3646 L7 50 893 50 893 50 893 52 646 52 846 53 046 53 246 53 446 53 646 L8 50 893 50 893 50 893 52 646 52 846 53 046 53 246 53 446 53 646 File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 35 HWA m gt Weights with 1 pump to be added to STD weight LENNOX gt MODEL 045 050 060 070 080 090 105 115CS HS 115CL HL FRAME 1 1 2 2 2 3 3 4 4 Total kg 128 39 128 39 156 42 156 42 156 42 160 2 160 2 161 6 161 6 L1 12 839 12 839 15 642 15 642 15 642 16 02 16 02 3 232 3 232 L2 12 839 12 839 15 642 15 642 15 642 16 02 16 02 3 232
8. 5293 3 6674 3 6674 3 6674 3 6674 3 6674 3 6674 L6 3 5293 3 5293 3 5293 3 6674 3 6674 3 6674 3 6674 3 6674 3 6674 L7 35 293 35 293 35 293 36 674 36 674 36 674 36 674 36 674 36 674 L8 35 293 35 293 35 293 36 674 36 674 36 674 36 674 36 674 36 674 File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 36 HWA 13 4 8 HYDRONIC MODULES WEIGHTS F gt Weights with 2 pumps full tank to be added to Free Cooling STD weight LENNOX gt MODEL 045FS 045FL 050FS 050FL 060FS 060FL 070FS 070FL FRAME 1 2 1 2 2 2 2 2 Total kg 428 7 577 7 428 7 577 7 584 7 584 7 584 7 584 7 L1 128 61 101 0975 128 61 101 0975 102 3225 102 3225 102 3225 102 3225 L2 128 61 101 0975 128 61 101 0975 102 3225 102 3225 102 3225 102 3225 L3 85 74 86 655 85 74 86 655 87 705 87 705 87 705 87 705 L4 85 74 86 655 85 74 86 655 87 705 87 705 87 705 87 705 L5 101 0975 101 0975 102 3225 102 3225 102 3225 102 3225 L6 101 0975 101 0975 102 3225 102 3225 102 3225 102 3225 L7 L8 MODEL 080FS 080FL 090FS 090FL 105FS 0105FL 115FS 115FL FRAME 2 3 3 4 3 4 4 4 Total kg 584 7 705 6 710 9 916 8 710 9 916 8 921 2 921 2 L1 102 3225 123 48 124 4075 137 52 124 4075 137 52 138 18 138 18 L2 102 3225 123 48 124 4075 137 52 124 4075 137 52 138 18 138 18 L3 87 705
9. can see the points of the unit we have calculated the weight values for and they are shown in the following tables nota bene the hydronic modules weight values C H F with 2 pumps full tank with 2 pumps with 1 pump must be added to the weight values of the standard units basic version C H F only cooling STD heat pump STD free cooling STD FRAME LENGHT DEPTH HEIGHT 1 1960 1197 1578 5 2360 1197 1578 5 3140 1197 1578 5 3481 5 1654 1637 4296 1654 1637 4296 1654 2137 File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 32 HWi mv LENNOX gt 13 4 1 TOTAL WEIGHTS STD C H F gt Only cooling HWA weights MODEL 045 050 060 070 080 090 105 115CS 115CL FRAME 1 1 2 2 2 3 3 4 4 Total kg 581 15 591 99 688 92 704 09 725 78 928 36 985 36 1233 68 1264 68 L1 174 345 177 597 120 561 123 21575 127 0115 162 463 172 438 185 052 189 702 L2 174 345 177 597 120 561 123 21575 127 0115 162 463 172 438 185 052 189 702 L3 116 23 118 398 103 338 105 6135 108 867 139 254 147 804 123 368 126 468 L4 116 23 118 398 103 338 105 6135 108 867 139 254 147 804 123 368 126 468 L5 120 561 123 21575 127 0115 162 463 172 438 185 052 189 702 L6 120 561 123 21575 127 0115 162 463 172 438 185 052 1
10. flow rate In situations where the action of air currents is inevitable and there is a simultaneous presence of temperatures below 5 C the control of condensation for low outdoor temperatures must be of the flooding type or with a device for choking the condensing exchanger contact the technical department for further details possible reverberation of sound waves models belonging to the HWA series are designed and built for outdoor installation avoid covering them with roof structures or positioning them near plants even if they only partly cover the unit which may interfere with the regular ventilation of the unit condenser It is a good idea to create a base of adequate dimensions to support the unit This precaution becomes essential when the unit is to be sited on unstable ground various types of soil gardens etc It is advisable to place a rigid rubber strip between the base frame and the supporting surface Whenever more effective insulation is required it is recommended to use vibrating damping spring supports In the case of installation on roofs or intermediate storeys the unit and pipes must be insulated from walls and ceilings by placing rigid rubber joints in between and using supports that are not rigidly anchored to the walls If the unit is to be installed in proximity to private offices bedrooms or areas where noise levels must be kept down it is advisable to conduct a thorough analysis of the sound field g
11. from 44 8 to 304 9 kW Chillers with liquid HWA FS FL which cover a power range from 46 2 to 301 2 kW 2 FIELD OF APPLICATION These machines are designed to cool heat water and solutions containing up to 30 glycol percentage by weight in civil industrial and technological air conditioning systems They must be used in observance of the operating limits specified in this manual failure to comply with said limits will invalidate the warranties provided in the contract of sale 3 GENERALITIES When installing or servicing the chiller you must strictly follow the rules provided in this manual comply with the directions on the units 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 Therefore only qualified personnel may perform any kind of work on the unit ONLY QUALIFIED PERSONNEL MAY EXECUTE THE FIRST START UP OF THE UNIT AND IT IS NECESSARY THE AUTHORIZATION BY GALLETTI S P A SEE ATTACHMENT Failure to comply with the rules provided in this manual or any modification made to the unit without prior authorisation will result in the immediate invalidation of the warranty Warning Before performing any kind of work on the unit make sure it has been disconnected from the power supply File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 4 4 INSPECTIO
12. 105 84 106 635 91 68 106 635 91 68 92 12 92 12 L4 87 705 105 84 106 635 91 68 106 635 91 68 92 12 92 12 L5 102 3225 123 48 124 4075 137 52 124 4075 137 52 138 18 138 18 L6 102 3225 123 48 124 4075 137 52 124 4075 137 52 138 18 138 18 L7 91 68 91 68 92 12 92 12 L8 91 68 91 68 92 12 92 12 MODEL 130FS 130FL 150FS 150FL 180FS 180FL 205FS 205FL FRAME 4 4 4 5 5 5 5 5 Total kg 921 2 921 2 921 2 1121 1 1128 3 1128 3 1128 3 1128 3 L1 138 18 138 18 138 18 168 165 169 245 169 245 169 245 169 245 L2 138 18 138 18 138 18 168 165 169 245 169 245 169 245 169 245 L3 92 12 92 12 92 12 112 11 112 83 112 83 112 83 112 83 4 92 12 92 12 92 12 112 11 112 83 112 83 112 83 112 83 L5 138 18 138 18 138 18 168 165 169 245 169 245 169 245 169 245 L6 138 18 138 18 138 18 168 165 169 245 169 245 169 245 169 245 L7 92 12 92 12 92 12 112 11 112 83 112 83 112 83 112 83 L8 92 12 92 12 92 12 112 11 112 83 112 83 112 83 112 83 MODEL 220FS 220FL 235FS 235FL 250FS 250FL 280FS 300FS FRAME 5 6 5 6 6 6 6 6 Total kg 1128 3 1130 5 1128 3 1130 5 1134 7 1134 7 1134 7 1134 7 L1 169 245 169 575 169 245 169 575 170 205 170 205 170 205 170 205 L2 169 245 169 575 169 245 169 575 170 205 170 205 170 205 170 205 L3 112 83 113 05 112 83 113 05 113 47 113 47 113 47 113 47 L4 112 83 113 05 112 83 113 05 113 47 113 47 113 47 113 47 L5 169 245 169 575 169 245 169 575 170 205 170 205 170 205 170 205 L6 169 245 169 575 169 245 169 575 170 205 170 205 170 205 170 205 L7 112 83 113 05 112 83 113 05 113 47
13. 113 47 113 47 113 47 L8 112 83 113 05 112 83 113 05 113 47 113 47 113 47 113 47 gt Weights with 2 pumps to be added to Free Cooling STD weight MODEL 045FS 045FL 050FS 050FL 060FS 060FL 070FS 070FL FRAME 1 2 1 2 2 2 2 2 Total kg 173 7 197 7 173 7 197 7 204 7 204 7 204 7 204 7 L1 52 11 34 5975 52 11 34 5975 35 8225 35 8225 35 8225 35 8225 L2 52 11 34 5975 52 11 34 5975 35 8225 35 8225 35 8225 35 8225 L3 34 74 29 655 34 74 29 655 30 705 30 705 30 705 30 705 L4 34 74 29 655 34 74 29 655 30 705 30 705 30 705 30 705 L5 34 5975 34 5975 35 8225 35 8225 35 8225 35 8225 L6 34 5975 34 5975 35 8225 35 8225 35 8225 35 8225 L7 L8 MODEL 080FS 080FL 090FS 090FL 105FS 0105FL 115FS 115FL FRAME 2 3 3 4 3 4 4 4 Total kg 204 7 208 6 213 9 217 8 213 9 217 8 222 2 222 2 L1 35 8225 36 505 37 4325 32 67 37 4325 32 67 33 33 33 33 L2 35 8225 36 505 37 4325 32 67 37 4325 32 67 33 33 33 33 L3 30 705 31 29 32 085 21 78 32 085 21 78 22 22 22 22 L4 30 705 31 29 32 085 21 78 32 085 21 78 22 22 22 22 L5 35 8225 36 505 37 4325 32 67 37 4325 32 67 33 33 33 33 L6 35 8225 36 505 37 4325 32 67 37 4325 32 67 33 33 33 33 L7 21 78 21 78 22 22 22 22 L8 21 78 21 78 22 22 22 22 File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 37
14. 2 179 12 L4 124 677 124 677 114 284 114 284 114 284 138 44 138 44 179 12 179 12 L5 114 284 114 284 114 284 138 44 138 44 71 648 71 648 L6 114 284 114 284 114 284 138 44 138 44 71 648 71 648 L7 179 12 179 12 L8 179 12 179 12 MODEL 130CS HS 130CL HL 150CS HS 150CL HL 180CS HS 180CL HL 205CS HS 205CL HL 220CS HS FRAME 4 4 4 4 4 5 5 5 5 Total kg 895 6 895 6 896 6 896 6 934 6 1151 465 1151 465 1151 465 1151 465 L1 17 912 17 912 17 932 17 932 18 692 23 0293 23 0293 23 0293 23 0293 L2 17 912 17 912 17 932 17 932 18 692 23 0293 23 0293 23 0293 23 0293 L3 179 12 179 12 179 32 179 32 186 92 230 293 230 293 230 293 230 293 L4 179 12 179 12 179 32 179 32 186 92 230 293 230 293 230 293 230 293 L5 71 648 71 648 71 728 71 728 74 768 92 1172 92 1172 92 1172 92 1172 L6 71 648 71 648 71 728 71 728 74 768 92 1172 92 1172 92 1172 92 1172 L7 179 12 179 12 179 32 179 32 186 92 230 293 230 293 230 293 230 293 L8 179 12 179 12 179 32 179 32 186 92 230 293 230 293 230 293 230 293 MODEL 220CL HL 235CS HS 235CL HL 250CS HS 250CL HL 280CS HS 280CL HL 300CS HS 300CL HL FRAME 5 5 5 6 6 6 6 6 6 Total kg 1151 465 1151 465 1151 465 1160 43 1161 43 1162 43 1163 43 1164 43 1165 43 L1 23 0293 23 0293 23 0293 23 2086 23 2286 23 2486 23 2686 23 2886 23 3086 L2 23 0293 23 0293 23 0293 23 2086 23 2286 23 2486 23 2686 23 2886 23 3086 L3 230 293 230 293 230 293 301 7118 301 9718 302 2318 302 4918 302 7518 303 0118 L4 230 293 230 293 230 293 301 7118 301 9
15. 2 28 44 28 77 28 44 28 77 29 13 29 13 29 13 29 13 L3 18 96 19 18 18 96 19 18 19 42 19 42 19 42 19 42 4 18 96 19 18 18 96 19 18 19 42 19 42 19 42 19 42 L5 28 44 28 77 28 44 28 77 29 13 29 13 29 13 29 13 L6 28 44 28 77 28 44 28 77 29 13 29 13 29 13 29 13 L7 18 96 19 18 18 96 19 18 19 42 19 42 19 42 19 42 L8 18 96 19 18 18 96 19 18 19 42 19 42 19 42 19 42 File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 38 13 5 WATER PUMPING AND STORAGE SYSTEMS HWA units may be equipped with 4 types of pumping systems complete with expansion tank and inertial storage reservoirs single standard pump single uprated pump standard pump and back up pump uprated pump and back up pump In the case of pump systems including a back up pump the microprocessor controls the pumps in such a way as to equally divide the hours of operation changing over the pumps in the event of a fault Standard pump type A A B B B C Available head HWA with standard pump nominal flow rate kPa 79 74 123 117 116 159 Rated electrical output standard pump kW 0 55 0 55 0 75 0 75 0 75 1 50 Operating current standard pump A 1 7 1 7 2 3 2 3 2 3 4 3 Uprated pump type C C D D D Available head HWA with uprated pump nominal flow rate kPa 183 178 138 224 221 229 Rated electrical output uprated pump kW 1 50 1 50 2 20 2 20 2 20 3 00 Operating current uprated pump A 4
16. 2007 16 HWA m 8 5 FREE COOLING VERSION HWA F LENNOX gt Free Cooling units are only in cooling execution and it s not possible to link this execution with the heat pump one The series of these units because of the particular application type is equipped with a condensation pressure control device and microprocessor ADVANCED control The following picture shows the normal field of application of free cooling units Produced water T Outdoor air temp T 42 The inferior limit is dew to the freezing temperature limitation of glycolated solutions of 35 of glycol weight that is the maximum value possible for the tightness of the pumps in use On demand special ceramic tights of the pumps are available to allow the employment with T lower than the listed ones use of glycol in up to 50 of weight Produced water min 5 i temperature C amp t Etilenic glicol weight 0 i Blend freezing i 0 temperature 5 10 25 30 744 48 The series of free cooling units is provided with the heaters of the compressor oil sump The picture below fig Oil shows the characteristic Charles law for gases that melt in a liquid in greater volumes as well as the pressure and the contemporary temperature opposition action are higher on equal pressure in the sump an oil temperature increase reduces the melt refrigerant volume sensibly so that you could obtain the maintenance of the desired lubrica
17. 24 476 223 714 228 356 228 934 230 576 L8 198 704 193 104 199 804 219 834 224 476 223 714 228 356 228 934 230 576 gt Heat pump HWA weights MODEL 045 050 060 070 080 090 105 115HS 115HL FRAME 1 1 2 2 2 3 3 4 4 Total kg 601 15 611 99 710 92 726 09 747 78 953 36 1010 36 1263 68 1294 68 L1 180 345 183 597 124 411 127 06575 130 8615 166 838 176 813 189 552 194 202 L2 180 345 183 597 124 411 127 06575 130 8615 166 838 176 813 189 552 194 202 L3 120 23 122 398 106 638 108 9135 112 167 143 004 151 554 126 368 129 468 L4 120 23 122 398 106 638 108 9135 112 167 143 004 151 554 126 368 129 468 L5 124 411 127 06575 130 8615 166 838 176 813 189 552 194 202 L6 124 411 127 06575 130 8615 166 838 176 813 189 552 194 202 L7 126 368 129 468 L8 126 368 129 468 MODEL 130HS 130HL 150HS 150HL 180HS 180HL 205HS 205HL 220HS FRAME 4 4 4 4 4 5 5 5 5 Total kg 1271 68 1302 68 1456 37 1502 37 1615 31 1865 54 1920 54 1920 54 1956 04 L1 190 752 195 402 218 4555 225 3555 242 2965 279 831 288 081 288 081 293 406 L2 190 752 195 402 218 4555 225 3555 242 2965 279 831 288 081 288 081 293 406 L3 127 168 130 268 145 637 150 237 161 531 186 554 192 054 192 054 195 604 L4 127 168 130 268 145 637 150 237 161 531 186 554 192 054 192 054 195 604 L5 190 752 195 402 218 4555 225 3555 242 2965 279 831 288 081 288 081 293 406 L6 190 752 195 402 218 4555 225 3555 242 2965 279 831 288 081 288 081 293 406 L7 127 168 130 268 145 637 150 237 161 531 186 554 192 054 192 054 195 604 L8 127 168 130 2
18. 27 9035 131 0535 L4 141 47 121 227 143 638 122 853 125 628 128 778 127 9035 131 0535 L5 141 4315 143 3285 146 566 150 241 149 22075 152 89575 L6 141 4315 143 3285 146 566 150 241 149 22075 152 89575 L7 L8 MODEL 080FS 080FL 090FS 090FL 105FS 0105FL 115FS 115FL FRAME 2 3 3 4 3 4 4 4 Total kg 874 38 1056 76 1131 76 1460 28 1188 76 1471 68 1452 08 1483 08 L1 153 0165 184 933 198 058 219 042 208 033 220 752 217 812 222 462 L2 153 0165 184 933 198 058 219 042 208 033 220 752 217 812 222 462 L3 131 157 158 514 169 764 146 028 178 314 147 168 145 208 148 308 L4 131 157 158 514 169 764 146 028 178 314 147 168 145 208 148 308 L5 153 0165 184 933 198 058 219 042 208 033 220 752 217 812 222 462 L6 153 0165 184 933 198 058 219 042 208 033 220 752 217 812 222 462 L7 146 028 147 168 145 208 148 308 L8 146 028 147 168 145 208 148 308 MODEL 130FS 130FL 150FS 150FL 180FS 180FL 205FS 205FL FRAME 4 4 4 5 5 5 5 5 Total kg 1460 08 1491 08 1644 77 1939 9 2052 84 2100 84 2155 84 2209 84 L1 219 012 223 662 246 7155 290 985 307 926 315 126 323 376 331 476 L2 219 012 223 662 246 7155 290 985 307 926 315 126 323 376 331 476 L3 146 008 149 108 164 477 193 99 205 284 210 084 215 584 220 984 L4 146 008 149 108 164 477 193 99 205 284 210 084 215 584 220 984 L5 219 012 223 662 246 7155 290 985 307 926 315 126 323 376 331 476 L6 219 012 223 662 246 7155 290 985 307 926 315 126 323 376 331 476 L7 146 008 149 108 164 477 193 99 205 284 210 084 215 584 220 984 L8 146 008 149 108 16
19. 4 477 193 99 205 284 210 084 215 584 220 984 MODEL 220FS 220FL 235FS 235FL 250FS 250FL 280FS 300FS FRAME 5 6 5 6 6 6 6 6 Total kg 2191 34 2560 76 2201 34 2572 16 2537 14 2583 56 2575 94 2628 14 L1 328 701 384 114 330 201 385 824 380 571 387 534 386 391 394 221 L2 328 701 384 114 330 201 385 824 380 571 387 534 386 391 394 221 L3 219 134 256 076 220 134 257 216 253 714 258 356 257 594 262 814 L4 219 134 256 076 220 134 257 216 253 714 258 356 257 594 262 814 L5 328 701 384 114 330 201 385 824 380 571 387 534 386 391 394 221 L6 328 701 384 114 330 201 385 824 380 571 387 534 386 391 394 221 L7 219 134 256 076 220 134 257 216 253 714 258 356 257 594 262 814 L8 219 134 256 076 220 134 257 216 253 714 258 356 257 594 262 814 File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 34 HWA 13 4 2 HYDRONIC MODULES WEIGHTS gt Weights with 2 pumps full tank to be added to STD weight LENNOX gt MODEL 045 050 060 070 080 090 105 115CS HS 115CL HL FRAME 1 1 2 2 2 3 3 4 4 Total kg 415 59 415 59 571 42 571 42 571 42 692 2 692 2 895 6 895 6 L1 83 118 83 118 57 142 57 142 57 142 69 22 69 22 17 912 17 912 L2 83 118 83 118 57 142 57 142 57 142 69 22 69 22 17 912 17 912 L3 124 677 124 677 114 284 114 284 114 284 138 44 138 44 179 1
20. 68 145 637 150 237 161 531 186 554 192 054 192 054 195 604 MODEL 220HL 235HS 235HL 250HS 250HL 280HS 280HL 300HS 300HL FRAME 5 5 5 6 6 6 6 6 6 Total kg 2024 04 1966 04 2034 04 2261 86 2308 28 2330 66 2347 08 2352 86 2369 28 L1 303 606 294 906 305 106 339 279 346 242 349 599 352 062 352 929 355 392 L2 303 606 294 906 305 106 339 279 346 242 349 599 352 062 352 929 355 392 L3 202 404 196 604 203 404 226 186 230 828 233 066 234 708 235 286 236 928 L4 202 404 196 604 203 404 226 186 230 828 233 066 234 708 235 286 236 928 L5 303 606 294 906 305 106 339 279 346 242 349 599 352 062 352 929 355 392 L6 303 606 294 906 305 106 339 279 346 242 349 599 352 062 352 929 355 392 L7 202 404 196 604 203 404 226 186 230 828 233 066 234 708 235 286 236 928 L8 202 404 196 604 203 404 226 186 230 828 233 066 234 708 235 286 236 928 File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 33 HWA LENNOX gt gt Free cooling HWA weights MODEL 045FS 045FL 050FS 050FL 060FS 060FL 070FS 070FL FRAME 1 2 1 2 2 2 2 2 Total kg 707 35 808 18 718 19 819 02 837 52 858 52 852 69 873 69 L1 212 205 141 4315 215 457 143 3285 146 566 150 241 149 22075 152 89575 L2 212 205 141 4315 215 457 143 3285 146 566 150 241 149 22075 152 89575 L3 141 47 121 227 143 638 122 853 125 628 128 778 1
21. 718 302 2318 302 4918 302 7518 303 0118 L5 92 1172 92 1172 92 1172 23 2086 23 2286 23 2486 23 2686 23 2886 23 3086 L6 92 1172 92 1172 92 1172 23 2086 23 2286 23 2486 23 2686 23 2886 23 3086 L7 230 293 230 293 230 293 232 086 232 286 232 486 232 686 232 886 233 086 L8 230 293 230 293 230 293 232 086 232 286 232 486 232 686 232 886 233 086 Weights with 2 pumps to be added to STD weight MODEL 045 050 060 070 080 090 105 115CS HS 115CL HL FRAME 1 1 2 2 2 3 3 4 4 Total kg 160 59 160 59 191 42 191 42 191 42 195 2 195 2 196 6 196 6 L1 16 059 16 059 19 142 19 142 19 142 19 52 19 52 3 932 3 932 L2 16 059 16 059 19 142 19 142 19 142 19 52 19 52 3 932 3 932 L3 64 236 64 236 19 142 19 142 19 142 19 52 19 52 51 116 51 116 L4 64 236 64 236 19 142 19 142 19 142 19 52 19 52 51 116 51 116 L5 57 426 57 426 57 426 58 56 58 56 3 932 3 932 L6 57 426 57 426 57 426 58 56 58 56 3 932 3 932 L7 39 32 39 32 L8 39 32 39 32 MODEL 130CS HS 130CL HL 150CS HS 150CL HL 180CS HS 180CL HL 205CS HS 205CL HL 220CS HS FRAME 4 4 4 4 4 5 5 5 5 Total kg 196 6 196 6 197 6 197 6 235 6 254 465 254 465 254 465 254 465 L1 3 932 3 932 3 952 3 952 4 712 5 0893 5 0893 5 0893 5 0893 L2 3 932 3 932 3 952 3 952 4 712 5 0893 5 0893 5 0893 5 0893 L3 51 116 51 116 51 376 51 376 61 256 66 1609 66 1609 66 1609 66 1609 L4 51 116 51 116 51 376 51 376 61 256 66 1609 66 1609 66 1609 66 1609 L5 3 932 3 932 3 952 3 952 4 712 5 0893 5 0893 5 0893 5 0893 L6 3 932 3 932 3 952 3 952 4 712
22. 84 24 48 27 84 24 48 25 26 25 26 25 26 25 26 L4 27 84 24 48 27 84 24 48 25 26 25 26 25 26 25 26 L5 28 56 28 56 29 47 29 47 29 47 29 47 L6 28 56 28 56 29 47 29 47 29 47 29 47 L7 L8 MODEL 080FS 080FL 090FS 090FL 105FS 0105FL 115FS 115FL FRAME 2 3 3 4 3 4 4 4 Total kg 168 4 172 3 175 9 179 7 175 9 179 7 182 3 182 3 L1 29 47 30 1525 30 7825 26 955 30 7825 26 955 27 345 27 345 L2 29 47 30 1525 30 7825 26 955 30 7825 26 955 27 345 27 345 L3 25 26 25 845 26 385 17 97 26 385 17 97 18 23 18 23 L4 25 26 25 845 26 385 17 97 26 385 17 97 18 23 18 23 L5 29 47 30 1525 30 7825 26 955 30 7825 26 955 27 345 27 345 L6 29 47 30 1525 30 7825 26 955 30 7825 26 955 27 345 27 345 L7 17 97 17 97 18 23 18 23 L8 17 97 17 97 18 23 18 23 MODEL 130FS 130FL 150FS 150FL 180FS 180FL 205FS 205FL FRAME 4 4 4 5 5 5 5 5 Total kg 182 3 182 3 182 3 184 1 189 6 189 6 189 6 189 6 L1 27 345 27 345 27 345 27 615 28 44 28 44 28 44 28 44 L2 27 345 27 345 27 345 27 615 28 44 28 44 28 44 28 44 L3 18 23 18 23 18 23 18 41 18 96 18 96 18 96 18 96 L4 18 23 18 23 18 23 18 41 18 96 18 96 18 96 18 96 L5 27 345 27 345 27 345 27 615 28 44 28 44 28 44 28 44 L6 27 345 27 345 27 345 27 615 28 44 28 44 28 44 28 44 L7 18 23 18 23 18 23 18 41 18 96 18 96 18 96 18 96 L8 18 23 18 23 18 23 18 41 18 96 18 96 18 96 18 96 MODEL 220FS 220FL 235FS 235FL 250FS 250FL 280FS 300FS FRAME 5 6 5 6 6 6 6 6 Total kg 189 6 191 8 189 6 191 8 194 2 194 2 194 2 194 2 L1 28 44 28 77 28 44 28 77 29 13 29 13 29 13 29 13 L
23. 89 702 L7 123 368 126 468 L8 123 368 126 468 MODEL 130CS 130CL 150CS 150CL 180CS 180CL 205CS 205CL 220CS FRAME 4 4 4 4 4 5 5 5 5 Total kg 1241 68 1272 68 1426 37 1472 37 1585 31 1830 54 1885 54 1885 54 1921 04 L1 186 252 190 902 213 9555 220 8555 237 7965 274 581 282 831 282 831 288 156 L2 186 252 190 902 213 9555 220 8555 237 7965 274 581 282 831 282 831 288 156 L3 124 168 127 268 142 637 147 237 158 531 183 054 188 554 188 554 192 104 L4 124 168 127 268 142 637 147 237 158 531 183 054 188 554 188 554 192 104 L5 186 252 190 902 213 9555 220 8555 237 7965 274 581 282 831 282 831 288 156 L6 186 252 190 902 213 9555 220 8555 237 7965 274 581 282 831 282 831 288 156 L7 124 168 127 268 142 637 147 237 158 531 183 054 188 554 188 554 192 104 L8 124 168 127 268 142 637 147 237 158 531 183 054 188 554 188 554 192 104 MODEL 220CL 235CS 235CL 250CS 250CL 280CS 280CL 300CS 300CL FRAME 5 5 5 6 6 6 6 6 6 Total kg 1987 04 1931 04 1998 04 2198 34 2244 76 2237 14 2283 56 2289 34 2305 76 L1 298 056 289 656 299 706 329 751 336 714 335 571 342 534 343 401 345 864 L2 298 056 289 656 299 706 329 751 336 714 335 571 342 534 343 401 345 864 L3 198 704 193 104 199 804 219 834 224 476 223 714 228 356 228 934 230 576 L4 198 704 193 104 199 804 219 834 224 476 223 714 228 356 228 934 230 576 L5 298 056 289 656 299 706 329 751 336 714 335 571 342 534 343 401 345 864 L6 298 056 289 656 299 706 329 751 336 714 335 571 342 534 343 401 345 864 L7 198 704 193 104 199 804 219 834 2
24. CE THERMOSTAT ANTIFREEZE THERMOSTAT ANTI RECYCLE TIMER OIL DIFFERENTIAL PRESSURE SWITCH 10 ROUTINE MAINTENANCE AND CHECKS 10 1 10 2 10 3 10 4 10 5 10 6 10 7 WARNINGS GENERALITIES REPAIRING THE COOLING CIRCUIT TIGHTNESS TEST HARD VACUUM AND DRYING OF THE COOLING CIRCUIT CHARGING WITH R407C REFRIGERANT ENVIRONMENTAL PROTECTION 11 RETIRING THE UNIT 12 TROUBLESHOOTING 13 WATER PRESSURE DROPS 13 1 13 2 13 3 EVAPORATOR PRESSURE DROPS RECUPERATOR PRESSURE DROPS FREE COOLING COILS PRESSURE DROPS 13 4 WEIGHTS SUMMARIZING TABLES 13 4 1 TOTAL WEIGHTS STD C H F 13 4 2 HYDRONIC MODULES WEIGHTS C H 13 4 3 HYDRONIC MODULES WEIGHTS F 13 5 WATER PUMPING AND STORAGE SYSTEMS File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 LENNOX gt 23 23 23 23 24 24 24 25 25 25 26 26 27 27 27 31 31 31 32 32 33 35 37 39 HWA LENNOX gt C Declaration of conformity Hiref S p A whose main office is at n81 33 Viale Spagna Tribano Pd Italy hereby declares under its sole responsibility that the HWA water chillers CS CL only cooling HS HL with heat pump and FS FL with free cooling devices for air conditioning systems conform to the specifications of EEC Directives 73 23 89 392 91 368 93 44 93 68 97 23 89 336 Tribano li 05 04 2006 Luiai Galletti President 1 THE SERIES The group series includes Chillers with fluid and heat pump HWA CS CL HS HL which cover a power range
25. Installation use and maintenance manual ONLY COOLING HEAT PUMP AND FREE COOLING UNITS WITH QUALITY SYSTEM CERTIFIED BY AFAQ AFNOR LENNOX ISO 9001 2000 INDEX TECHNICAL DATA Ref technical data label PAGE 1 THE SERIES 4 2 FIELD OF APPLICATION 4 3 GENERALITIES 4 4 INSPECTION CONVEYANCE SITING 5 4 1 INSPECTION 5 42 LIFTING AND CONVEYANCE 5 4 3 UNPACKING 6 4 4 SITING 6 5 INSTALLATION 7 5 1 INSTALLATION CLEARANCE REQUIREMENTS 7 5 2 GENERAL GUIDELINES FOR PLUMBING CONNECTIONS 8 5 3 WATER CONNECTION TO THE EVAPORATOR 9 5 4 INSTRUCTIONS FOR THE FILLING UP OF THE TANK 10 5 5 SAFETY VALVE DRAIN PIPES 11 6 ELECTRICAL CONNECTIONS 11 6 1 GENERALITIES 11 6 2 ELECTRIC CONNECTIONS OF FLOW SWITCH OR DIFFERENTIAL WATER PRESSURE SWITCH 12 6 3 ELECTRIC CONNECTIONS OF THE CIRCULATION PUMP 12 6 4 REMOTE CONTROLS 12 6 5 REMOTE SUMMER WINTER SWITCHING 12 7 STARTING UP 12 7 1 PRELIMINARY CHECKS 12 7 2 STARTING OPERATION 13 7 3 CHECKS DURING OPERATION 14 7 4 CHECKING THE REFRIGERANT LEVEL 14 7 5 STOPPING THE UNIT 15 8 OPERATING LIMITS 16 8 1 WATER FLOW TO EVAPORATOR 16 8 2 CHILLED WATER TEMPERATURES 16 8 3 OUTDOOR AIR TEMPERATURE 16 8 4 OPERATION WITH WATER AT LOW TEMPERATURES 16 85 FREE COOLING VERSION HWA F 17 9 CONTROL DEVICE SETTINGS 21 9 1 GENERALITIES 21 9 2 MAXIMUM PRESSURE SWITCH 23 File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 2 HWA 9 3 9 4 9 5 9 6 9 7 MINIMUM PRESSURE SWITCH SERVI
26. N CONVEYANCE SITING 4 4 INSPECTION On receiving the unit check that it is perfectly intact the machine left the factory in perfect conditions immediately report any signs of damage to the carrier and note them on the Delivery Slip before signing it Galletti S p A 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 Starting operation ratio Electric pattern Certificate of warrantee and list of assistance centres Check integrity of this user manual 4 2 LIFTING AND CONVEYANCE While the unit is being unloaded and positioned utmost care must be taken to avoid abrupt or violent manoeuvres The unit must be handled carefully and gently avoid using machine components as anchorages when lifting or moving it The unit must be lifted using steel pipes of 011 GAS with depth at least 3mm inserted through the eyebolts provided on the base frame see fig below and check off with appropriate stickers The pipes which must run at least 300mm out of each side should be harnessed with rope all equal and ensured to the uplift hook firms at pipes ends are necessary to avoid that because of the unit weight the rope run away from the pipe itself Use ropes or belts of adequate length longer than the unit height and spacer bars put on the unit top to avoid damaging the sides and top of the unit itself Warning In all lifting op
27. The electrical connections must be made in accordance with the information shown in the wiring diagram provided with the unit and current regulations An earth connection is required by law The installer must connect the earthing wire using the earthing terminal situated on the electric control board yellow and green wire The power supply to the control circuit is shunted from the power line through an insulating transformer situated on the electric control board The control circuit is protected by suitable fuses File HWAF 0 UM GB 04 LENNOX doc Validit 21 05 2007 11 6 2 ELECTRIC CONNECTIONS OF FLOW SWITCH OR DIFFERENTIAL WATER PRESSURE SWITCH It is pre wired in all HWA units Units up to model 105 feature a differential pressure switch that detects pressure drops upstream and downstream from the evaporator outgoing returning water in the case of units equipped with a pump system units from model 115 to model 300 have a blade type flow switch installed in series with water circuit 6 3 ELECTRIC CONNECTIONS OF THE CIRCULATION PUMP If selected on ordering it they is are supplied pre wired with all HWA units The pump must be started before the chiller and stopped after the latter minimum recommended delay 60 seconds If included as an option this function is already performed by the electric control board on the unit 6 4 REMOTE CONTROLS If you wish to include a remote control for switching the unit on and off y
28. ached Since R407C is a ternary mixture charging must take place exclusively with liquid refrigerant to ensure the correct percentages of the three constituents Introduce refrigerant through the inlet in the liquid line A unit that was originally charged with R407C in the factory cannot be charged with R22 or other refrigerants File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 26 10 7 ENVIRONMENTAL PROTECTION The law implementing the regulations reg EEC 2037 00 which govern the use of ozone depleting substances and greenhouse gases bans the dispersal of refrigerant gases in the environment and requires whoever is in their possession to recover them and at the end of their useful life either to return them to the dealer or take them to a suitable waste disposal facility The refrigerant HFC R407C is not harmful to the ozone layer but is included among the substances responsible for the greenhouse effect and thus falls within the scope of the aforesaid regulations Therefore special care should be taken when carrying out maintenance work to minimise refrigerant leaks 11 RETIRING THE UNIT When the unit has reached the end of its working life and needs to removed and replaced a series of operations should be carried out the refrigerant gas it contains should be recovered by specialised personnel and sent to a waste collection facility the lubricating oil in the compressors should also be recovered and sent t
29. chiller using flexible couplings to prevent the transmission of vibrations and to compensate thermal expansions It is recommended to install the following components on the pipes e temperature and pressure indicators for routine maintenance and monitoring of the unit Checking the pressure on the water side will enable you to verify whether the expansion tank is working efficiently and to promptly detect any water leaks within the equipment etraps on incoming and outgoing pipes for temperature measurements which can provide a direct reading of the operating temperatures Temperature readings can in any case be obtained from the microprocessor installed on the unit e regulating valves gate valves for isolating the unit from the water circuit e metal mesh filter incoming pipes with a mesh not to exceed 1 mm to protect the exchanger from scale or impurities present in the pipes e air vent valves to be placed at the highest points of the water circuit for the purpose of bleeding air The internal pipes of the unit are fitted with small air vent valves for bleeding the unit itself this operation may only be carried out when the unit is disconnected from the power supply mainly on Free Cooling units be sure that the circuit is completely full of water than clean the water coils from air to avoid cavitation events of the pump itself e drainage valve and where necessary a drainage tank for emptying out the equipment for maint
30. ck flow of air The compressor does not start internal thermal protection In the case of compressors device has tripped equipped with a protection module check the thermal contact Identify the causes after restarting The circuit breakers or line fuses Pinpoint the cause by measuring have been tripped by a short circuit the resistance of the individual windings and the insulation from the casing before restoring power switches has tripped eliminate the causes the distribution compartment File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 29 Possible causes Corrective actions High evaporation pressure Water T too high Check the thermal load and or efficiency of the thermostat function Check the efficiency of the thermostatic valve p p Defrosting absent or incomplete Error in parameter settings Check the setting of the start and HS HL versions end defrost parameters on the microprocessor Check whether defrosting water is properly drained from the coils Check the uniformity of the refrigerant circuit outlet temperatures at the top and bottom of the coils the maximum thermal differential allowed is 10 C Check the refrigerant level energized and deenergized Free Cooling malfunctioning Failure to exchange the 3 way It is possible to hand force the valve FS FL units valve in activation to open but it is advisable to leave the unit working only mechanicall Failure to exchange the 3 way It is
31. close to the value set on the service thermostat 74 CHECKING THE REFRIGERANT LEVEL After a few hours of operation check whether the liquid level indicator has a green crown a yellow colour indicates the presence of humidity in the circuit In such a case the circuit must be dehumidified by qualified personnel Large quantities of bubbles should not appear through the liquid level indicator A constant passage of numerous bubbles may indicate that the refrigerant level is low and needs to be topped up The presence of a few bubbles is however allowed especially in the case of high glide ternary mixtures such as HFC R407C A few minutes after the compressors have started up check that the end of condensation temperature shown on the pressure gauge refer to the pressure gauge scale for the refrigerant R407C marked with the initials Bubble Point is about 19 22 C higher than the temperature of the air entering the condenser with the fans driven at top speed Also check that the end of evaporation temperature shown on the pressure gauge refer to the pressure gauge scale for the refrigerant R407C marked with the initials D P Dew Point is about 5 6 C lower than the temperature of the water leaving the evaporator Make sure the overheating of the cooling fluid is limited to between 5 and 8 C to this end 1 read the temperature indicated by a contact thermometer placed on the compressor intake pipe 2 read the te
32. e specifically that no vibrations and or knocking can be detected 10 3 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 If the cooling circuit has undergone any repairs the following operations must be carried out tightness test emptying and drying of the cooling circuit charging with refrigerant If the system has to be drained always recover the refrigerant present in the circuit using suitable equipment the refrigerant should be handled exclusively in the liquid phase 10 4 TIGHTNESS TEST Fill the circuit with anhydrous nitrogen supplied from a tank with a pressure reducing valve until the pressure rises to 10 bars During the pressurisation phase do not exceed the pressure setting of the safety valves otherwise you will cause the latter to open File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 25 HWA LENNOX The presence of any leaks must be determined using special leak detectors Should any leaks be detected during the test empty out the circuit before repairing the leaks with suitable alloys 10 5 HARD VACUUM AND DRYING OF THE COOLING CIRCUIT To achieve a hard vacuum in the cooling circuit it is necessary to
33. enance purposes or when the unit is taken out of service at the end of the season A 1 drainage valve is provided on the optional water storage reservoir this operation may only be carried out when the unit is disconnected from the power supply e It is necessary to use glycolic solutions on FS FL units max 30 of weight to prevent hardly reparable damages at the finned coil caused by freezing of the coil itself Check carefully the minimum air T which the unit could be espose to and consequently define the 9o of antifreeze to add coils and in general to the hydraulic cooling circuit If you don t use antifreeze solutions you may cause serious damages to the freecooling File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 8 HWA LENNOX gt 5 3 WATER CONNECTION TO THE EVAPORATOR connection marked Water Inlet It is of fundamental importance that the incoming water supply is hooked up to the Otherwise the evaporator would be exposed to the risk of freezing since the antifreeze thermostat would not be able to perform its function moreover the reverse cycle would not be respected in the cooling mode resulting in additional risks of malfunctioning The dimensions and position of plumbing connections are shown in the dimension tables at the back of the manual A The water circuit must be set up in such a way as to guarantee that the nominal flow rate of the water supplied to the evaporator remains constant
34. enerated and verify its compatibility with the local laws in force File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 6 5 INSTALLATION 5 1 INSTALLATION CLEARANCE REQUIREMENTS It is of fundamental importance to ensure an adequate volume of air both on the intake and outlet sides of the condenser coils it is highly important to prevent the air delivered from being re aspirated as this may impair the performance of the unit or even cause an interruption in normal operation For this reason it is necessary to guarantee the following clearances see figure on this page rear side plumbing connections min 1 5 metres to guarantee access to plumbing connections and or for any necessary maintenance on the pumps reservoir expansion tank and flow switch electric control board side min 1 5 metres to guarantee access for inspection and or maintenance of cooling components coil side min 1 5 metres to ensure proper air circulation and access to the compressor compartment also from the side top side there must be no obstacle to expulsion File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 7 5 2 GENERAL GUIDELINES FOR PLUMBING CONNECTIONS When you are getting ready to set up the water circuit for the evaporator you should follow the directions below and in any case make sure you comply with national or local regulations use the diagrams included in this manual as your reference Connect the pipes to the
35. erations make sure that the unit is securely anchored in order to prevent accidental falls or overturning File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 5 4 3 UNPACKING The packing must be carefully removed to avoid the risk of damaging the unit Different packing materials are used wood cardboard nylon etc It is recommended to keep them separately and deliver them to suitable waste disposal or recycling facilities in order to minimise their environmental impact Inside the unit if provided with pump s and or tank youll find the expansion pot packed and you have to fix it on the suction pipes of the pump in which you can find a TEE tight fixed or on the tank itself Remove the top and screw down the expansion pot only made by qualified personnel before filling the circuit with water and starting up the unit 44 SITING You should bear in mind the following aspects when choosing the best site for installing the unit and the relative connections size and origin of water pipes location of power supply accessibility for maintenance or repairs solidity of the supporting surface ventilation of the air cooled condenser and necessary clearance direction of prevalent winds avoid positioning the unit in such a way that the prevalent winds favour the backflow of air to the condenser coils a speed of 8 m s 28 8 km h already generates a sufficient stagnation pressure to guarantee 60 of the nominal air
36. g back from the user T1 and outdoor air T2 fig 5 fig 5 Free cooling coil s EK T2 Back from users The probe put at the evaporator input T3 than pilots the compressors starting up in integration in the event that the free cooling performance is not sufficient to cover the whole thermal requirements The temperatures T1 and T3 are always controlled by the microprocessor on board to verify possible anomalies of the free cooling 3 way valve for example if you have free cooling phase so with exchanged valve but T1 and T3 are equal it means that the valve is blocked in case of free cooling anomalies you can decide to produce only an alarm or to force the unit in power off File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 18 HWA me LENNOX The 3 way valve is also predisposed to manual positioning if there are some anomalies in the service servo motor in the following picture you can see the positioning of the 3 way valve 3 way valve in Free Cooling unit which you can have access to removing the cap shown in the following picture for manual activation Remove the cap to have access to the valve motor File HWAF 0 UM GB 04_LENNOX doc Validita 21 05 2007 19 The free cooling execution allows a very great energy saving in all those situations in which the outdoor temperature is lower than the temperature of the circulating flow process industry close control applications information technolo
37. gy in general convention halls The free cooling circuit performance depends on the difference between the outdoor air T and the circulating water T as shown in the picture fig 6 Fig 6 Cooling capacity Free Cooling capacity Cooler capacity Free Cooling only Cooler nominal capacitv Contemporary functioning FFT Full Free Cooling Temperature when the outdoor air T2 decrease below the water T1 back from the user it is possible to have thermal exchange and so free cooling action starts with a possible integration of one or more steps mechanical cooling During this phase it is important to have the maximum air flow so that the free cooling coils capacity is maximized and so as to have at the same time an effective control of the condensing pressure the condensing coils are provided with a special partialization circuit that reduces their thermal exchange surfaces allowing in this way the unit to work with maximum air flow fig 7 Back Outdoor air water T fig 7 x The both coil sections in fact are normally operating in only mechanical cooling working but when Free Cooling phase is activated so that outdoor air 2 are lower than T1 Delta T C in case of contemporary mechanical cooling request integration the section 1 is excluded and the ventilation can be forced at most maintaining an excellent control of the condensing pressure In total free cooling field the cooling capacity is modulated
38. hat they are securely tightened The movable and fixed contacts of the circuit breakers must be periodically cleaned and replaced whenever they show signs of deterioration Check the refrigerant level by means of the liquid level indicator every 6 months Check the oil levels through the windows provided on the compressor crankcases every 6 months Check the water circuit for leaks every 6 months If the unit has to remain out of service for a long time drain the water from the pipes and heat exchanger from the pump s option from the collect tank option and from the water coil if they are FREE COOLING units if you don t use glycolated solutions This is indispensable if during the period of quiescence the ambient temperature is expected to fall below the freezing point of the fluid used routine seasonal operation e Check the replenishment of the hydraulic circuit allowing air in the circuit to escape from the small valves put on the highest points Check the efficiency of the flow switch or differential pressure switch Check the heating elements where present of the compressor crankcases Clean the metal mesh filters mounted externally on the water pipes Check the humidity indicator on the liquid level indicator green dry yellow humid if the indicator is not green as shown on the indicator sticker replace the filter every 6 months e Check that the noise emissions of the unit are regular every 6 months and mor
39. he control panel red button heating green button cooling and press the ON button on the control panel The unit will start up if enabled by the safety devices of the water circulation pump s the flow switch or differential pressure switch by the T sensor measuring the temperature of the water returning from the system chiller inlet no alarms have been triggered If the unit fails to start up check whether 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 at the end of the season To turn off the unit temporarily follow the directions provided in the section Stopping the Unit File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 13 7 3 CHECKS DURING OPERATION Check the phase sequence relay on the electric panel to verify whether the phases occur in the correct sequence if they do not disconnect the unit from power supply and invert two phases of the incoming three pole cable Never attempt to modify internal electrical connections any undue modifications will render the warranty null and void All the three phase devices on the unit compressor water pump and fans have a set direction of rotation and were harmonized in the factory Check that the temperature of the water entering the evaporator is
40. hen the pressure falls below the set differential see Table IIT 9 3 MINIMUM PRESSURE SWITCH The low pressure switch stops the compressor when the intake pressure falls below the set value for more than 180 seconds The switch is automatically reset when the pressure rises above the set differential see Table III however the unit will not resume operation until the alarm memory on the microprocessor control is cleared 9 4 SERVICE THERMOSTAT The function of this device is to start and stop the compressors according to the demand for chilled water as determined by a sensor placed at the evaporator inlet water returning from the circuit This device is a function included in the microprocessor control and works with a proportional bandwidth that may be set as desired 9 5 ANTIFREEZE THERMOSTAT The antifreeze sensor situated at the evaporator outlet detects the presence of excessively low temperatures and stops the unit Together with the flow switch and low pressure switch this device protects the evaporator from the risk of freezing as a result of faults in the water circuit This device is a function included in the microprocessor control 9 6 ANTI RECVCLE TIMER The function of the timer is to prevent excessively frequent compressor starts and stops This device is a function included in the microprocessor control It imposes a minimum time lapse of 300 seconds between two successive starts Never attempt to change the dela
41. hich may trigger the safety devices and cause the unit to stop 8 2 CHILLED WATER TEMPERATURES The minimum temperature of the water leaving the evaporator is 5 C lower temperatures are possible but for such applications the Manufacturer should be consulted at the time the order is placed The maximum temperature of the water entering the evaporator is 20 C To allow higher temperatures specific equipment solutions must be adapted split circuits three way valves bypasses storage reservoirs contact the Manufacturer 8 3 OUTDOOR AIR TEMPERATURE The units are designed and built to work with outdoor temperatures ranging from 10 with condensation control to 45 C Contact the Manufacturer in the event of outdoor temperatures beyond this range On request the units may be equipped with an electric heating element serving to heat the evaporator in cases where the unit is exposed to rigid temperatures during wintertime periods of quiescence The heating element is activated whenever the temperature of the water leaving the evaporator falls below the temperature set on the antifreeze heating element 8 4 OPERATION WITH WATER AT LOW TEMPERATURES The standard units are not designed to work with chilled water temperatures below 5 C at the evaporator outlet In order to work below this limit the unit requires specific technical adjustments in such cases contact the Manufacturer File HWAF 0 UM GB 04_LENNOX doc Validit 21 05
42. le e m Minimum pressure switch Modulating condensation control device i Sd Li dda OE Time lapse between two starts of the same compressor Delay in flow switch alarm Delay in low pressure alarm Pump rotation optional End of defrost pressure Maximum defrost time Minimum time lapse between two defrosting operations Safety valve water side Max PN water side with tank Max PN standard 3 way valve Max PN 3 way valve stem option File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 22 9 2 MAXIMUM PRESSURE SWITCH The high pressure switch is of the manually reset type and classifiable as category IV under EEC 97 23 It directly stops the compressor when the discharge pressure exceeds the set value fail to trip in the event of a pressure increase the pressure relief valve will open Warning do not attempt to change the setting of the pressure switch should the latter To verifv its efficiencv while the compressors are running close off the passage of air into the condensers and check by referring to the compressor outlet pressure gauge previously installed whether the pressure switch trips i e the compressors stop when the set value is reached as directed in the section Stopping the Unit in case the safety device fails to trip Warning while you are carrying out this check you should be ready to shut off the unit The high pressure switch must be manually rest this is possible only w
43. mperature indicated on the scale of a pressure gauge likewise connected to the intake side refer to the pressure gauge scale for the refrigerant R407C marked with the initials D P Dew Point The degree of overheating is given by the difference between the temperatures thus determined Make sure that the undercooling of the cooling fluid is limited to between 4 and 6 C to this end 1 read the temperature indicated by a contact thermometer placed on the condenser outlet pipe 2 read the temperature indicated on the scale of a pressure gauge connected to the liquid inlet at the condenser outlet refer to the pressure gauge scale for the refrigerant R407C marked with the initials B P Bubble Point File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 14 The degree of undercooling is given by the difference between the temperatures thus determined Warning the refrigerant R407C requires POE polyolester oil of type approved by the compressor manufacturer For no reason should a mineral oil be introduced into the oil circuit Real P compressor Average T outlet T1 T2 2 T1 start of condensation DEW POINT T2 end of condensation BUBBLE POINT 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 If pure fluids are used the phase change occurs at a constant T and thus the glide is equal to zero
44. necessary to hand force the valve in deactivation valve to close replacing its servo motor as soon as possible File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 30 13 WATER PRESSURE DROPS 13 14 EVAPORATOR PRESSURE DROPS The diagram shows the pressure drops on the water side Dpw as a function of the water flow rate Qw assuming an average water temperature of 10 C 200 140 7 2 N e Dpw kPa 8 w WR BA MY IY id co c ce rx 0 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000 110000 120000 Qw l h 13 2 RECUPERATOR PRESSURE DROPS The diagram shows the pressure drops on the water side Dpw as a function of the water flow rate Qw assuming an average water temperature of 42 5 200 180 160 140 j 2 120 FF eS 80 EC a 20 222 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 16000 Qw Ih File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 31 13 3 FREE COOLING COILS PRESSURE DROPS The diagram shows the pressure drops of the free cooling coils dependent on water flow referred to the water average temperature 12 C outlet from the co ils 60 180 235 FS 150 205 FL 50 060 080 FS 250 300 FS 045 070 FL 220 250 FL nm s LR 090 150 25 080 130 FL 0 0 10 20 30 40 50 60 Qw m3 h Dpw kPa co t e e n E x e 13 4 WEIGHTS SUMMARIZING TABLES In this draw you
45. nt on HS HL FS FL units by series File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 12 HWA LENNOX gt The heating elements must be turned on at least 12 hours before the unit is started A Their function is to raise the T of the oil in the sump and limit the quantity of refrigerant dissolved in it To verify whether the heating elements are working properly check the lower part of the compressors it should be warm or in any case at a temperature 10 15 C higher than the ambient temperature Pressure R407C in oil The diagram above illustrates a specific property Charles Law of gases which are more soluble in liquids as the pressure increases but less soluble as the temperature increases if the oil in the sump is held at a constant pressure an increase in temperature will significantly reduce the amount of refrigerant dissolved in it thus ensuring that the lubricating function desired is maintained Check that the plumbing connections have been properly made according to the indications given on the plates to be found on the unit itself proper inlet and outlet connections Make sure that the water circuit is duly bled to completely eliminate the presence of air load the circuit gradually and open the air vent valves on the top part which the installer should have set in place 7 2 STARTING OPERATION Before starting the chiller turn the main switch off select the operating mode desired from t
46. o a waste collection facility if they cannot be reused the framework and components should be scrapped and separated according to the type of material this applies especially for the considerable quantities of copper and aluminium present in the unit This will make the job of waste collection disposal and recycling facilities easier and minimise the environmental impact of such processes 12 TROUBLESHOOTING On the next pages you will find a list of the most common causes that may cause the chilling 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 Therefore once the cause has been identified you are advised to contact the manufacturer or a qualified technician for help File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 27 The unit does not start No power supply Check that power is being supplied both to the primary and auxiliary circuits The electronic card is cut off from Check the fuses the power supply Alarms have been triggered Check whether any alarms are signalled on the microprocessor control panel eliminate the causes and restart the unit The phase sequence is wrong Invert two phases in the primary power line after disconnecting them upstream from the unit The compres
47. ou must remove the bridge between the contacts indicated in the wiring diagram and connect the remote ON OFF control to the terminals themselves see annexed wiring diagram All remote controls work with a very low voltage 24 Vac supplied by the insulating transformer on the electric control board 6 5 REMOTE SUMMER WINTER SWITCHING If you wish to include a remote control for switching the unit between the summer and winter operating modes you must remove the bridge between the contacts indicated in the wiring diagram and connect the remote switching control to the terminals themselves see annexed wiring diagram 7 STARTING UP 7 1 PRELIMINARY CHECKS Check that all the valves in the cooling circuit are open liquid line 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 The phase sequence relay is positioned in the middle right part of the electric control board if the sequence is not duly observed it will not enable the machine to start Make sure there are no refrigerant leaks that may have been caused by accidental impacts during transport and or installation Check that the crankcase heating elements are properly connected to the power supply prese
48. regulating the fans speed to keep the outlet water T constant To prevent that the 3 way valve blocks off it is automatically exchanged up to 30 in every 140 h of work maintaining the cooler in motion File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 20 9 CONTROL DEVICE SETTINGS 9 1 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 The settings are shown in Tables II and III The control devices may be serviced SOLELY BY QUALIFIED TECHNICIANS incorrect settings may cause serious damage to the unit and injury to persons Many of the operating parameters and system settings are configured by means of the microprocessor control and are protected by passwords TABLE Il SETTING OF CONTROL DEVICES HWA SERIES Service Thermostat CS CL Service Thermostat HS HL HWA F SERIES Service Thermostat FS FL 10 18 File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 21 TABLE SETTING OF SAFETY CONTROL DEVICES HWA SERIES 28 L code dir 7 Time lapse between two starts of the same compressor Delay in flow switch alarm s Delay in low pressure alarm End of defrost pressure Maximum defrost time s Minimum time lapse between two defrosting operations HWA FREE COOLING SERIES Le 9 ci
49. rom the valves be conveyed to the outside by means of a suitable pipe with a diameter at least matching that of the valve drainage outlet the valve must not be made to bear the weight of the pipe The valves positioned on the compressor outlet only discharge hot saturated gas those on the liquid receivers despite being positioned in the top part of the latter may discharge saturated liquid and pose a greater hazard of burns due to the strong dehydrating effect caused by the sudden evaporation of refrigerant fluid in contact with bodies having a T gt 41 Warning Always direct the drain pipe toward an area where the discharge cannot harm N people 6 ELECTRICAL CONNECTIONS 6 1 GENERALITIES 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 connection to the power supply should be made with a three pole neutral cable and earthing wire The size of the cable and line protections must conform to the specifications provided in the wiring diagram The supply voltage may not undergo fluctuations exceeding 5 and the unbalance between phases must always be below 2 The above operating conditions must always be complied with failure to ensure said conditions will result in the immediate invalidation of the warranty
50. sor is noisy The compressor is rotating in the Check the phase sequence relay wrong direction Invert the phases on the terminal board after disconnecting the unit and contact the manufacturer Presence of abnormally high Insufficient flow of air to the Check whether all the fans pressure condenser turning properl Check the air T at the condenser inlet and make sure no back suction occurs Check whether the effective RMS vollage to the fans is the maximum If necessary check the pressure transducers controlling the revolution regulator where present optional Check the cleanliness of the finned coils Presence of air in the refrigerant Drain and pressurise the circuit circuit as revealed by theland check for leaks Generate a presence of bubbles in the flow slow vacuum longer than 3 hours indicator also with undercooling until reaching a pressure of 15 Pa values exceeding 5 and then recharge in the liquid phase an undercooling 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 pressure Insufficient flow of water in the Check the water circuit for case of heat pump operation pressure drops and or whether the pump is working properly direction of rotation Check the outgoing water T and make sure it less than or equal to 45C
51. tion characteristics The problem of insufficient lubrication when a suitable heating of the carter is absent occurs mainly after stops during which because of the lift compressor there occurs a sudden pressure droop in the sump and consequently a strong evaporation of the refrigerant melt before in the oil This event when there are no heatings could cause 2 problems oil dilution than insufficient lubrication File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 oil migration towards the cooling circuit because of the dragging of the refrigerant 17 fig oil Pressure R407C in oil Using the heaters is important mainly during the first starting up of the unit and it is better to switch them on at least 12 hours before starting the compressors up If outdoor air T decreases a lot the system water T control is warranted by the modulating action of the fans and in the negative strong dominant winds by the 3 way valve lock Only on demand for borderline cases the modulating joint action by the 3 way valve is available Cooling circuit in Free Cooling units In addition to above written Free Cooling units are provided with a 3 way valve able to deviate the flow towards the Free Cooling coils that are put upstream compared with the condensing ones in the air flow The valve activation is controlled by microprocessor ADVANCED on series that check the difference between the set point T of water comin
52. to a pipe with a diameter at least as large as that of the valve opening and direct it toward an area where the discharge of water cannot harm people This is a standard feature of units equipped with the optional storage reservoir 5 4 INSTRUCTIONS FOR THE FILLING UP OF THE TANK The tank is not planned to resist to a depression greater than 0 15 Bar so pay attention to the fact that the suction pressure of the pump where the expansion tank is positioned has to be always greater than 0 5 Bar with the pump in operation this fact also contributes to reduce any risks concerning the cavitation of the pump It is of fundamental importance for the installer to follow and check the instructions written below stepwise so as to avoid every kind of risks concerning the implosion of the tank or the cavitation of the pump a Empty the expansion tank until the pressure is 0 5 Bar b Charge the system and pressurize it until about 1 Bar in suction pump side with pump not working C Allow air to escape from the system d Check the suction pressure of the pump about 1 Bar and start the system e Stop the pump after 15 30 minutes and repeat from point c until you don t hear noises caused by air still present in the system anymore File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 10 5 5 SAFETY VALVE DRAIN PIPES Safety valves are fitted in each refrigerant circuit some regulations provide that the refrigerant drained f
53. use a pump capable of generating a high degree of vacuum i e 15 Pa of absolute pressure If there is no suitable vacuum pump available or whenever the circuit has remained open for long periods of time you are strongly recommended to adopt the triple evacuation method This method is also recommended when there is a presence of humidity within the circuit The vacuum pump should be connected to the inlets The procedure to be carried out is as follows Evacuate the circuit until you reach an absolute pressure of at least 35 Pa at this point inject nitrogen into the circuit until you reach a relative pressure of about 1 bar Repeat the step described above Carry out the step described above for the third time but in this case attempting to reach the hardest vacuum possible Using this procedure you can easily remove up to 99 of pollutants 10 6 CHARGING WITH R407C REFRIGERANT Connect the cylinder of refrigerant gas to the male 1 4 SAE inlet situated on the liquid line after discharging a little gas to eliminate air in the connection pipe Carry out the charging operation with the refrigerant in liquid form until you reach 75 of the total charge Then connect to the inlet on the intake line and complete the charging process with the refrigerant in liquid form until no more bubbles can be seen on the liquid level indicator and the operating parameters specified in the section Checking the refrigerant level have been re
54. y set in the factory wrong settings could cause serious damage to the unit File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 23 9 7 OIL DIFFERENTIAL PRESSURE SWITCH HWA units are equipped with spinning scroll compressors these compressors do not have a lubricant pump and therefore no oil differential pressure switch is provided 10 ROUTINE MAINTENANCE AND CHECKS 10 1 WARNINGS All the operations described in this chapter MUST ALWAYS BE PERFORMED BY QUALIFIED PERSONNEL Before carrying out any work on the unit or accessing internal parts make sure you have disconnected it from the mains electricity supply The upper part and outlet pipe of the compressor may reach temperatures as high as 110 C Be especially careful when working in the surrounding area while the unit is running Be especially careful when working in proximity to finned coils since the 0 11 mm thick aluminium fins can cause superficial injuries due to cuts After completing maintenance jobs always replace the panels enclosing the units and secure them with the fastening screws provided gt File HWAF 0 UM GB 04_LENNOX doc Validit 21 05 2007 24 10 2 GENERALITIES It is a good idea to carry out periodic checks to ensure that the unit is working properly e Check the efficiency of all the control and safety devices as previously described e Check the terminals on the electric control board and compressor terminal boards to ensure t
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