Lennox HP29
Lennox HP29 Lennox HP29
IMPORTANTThe following procedures require accuratereadings of ambient (outdoor) temperature, liquidtemperature and liquid pressure for propercharging. Use a thermometer with accuracy of+2°F( + 1.1°C) and a pressure gauge with accuracyof +5PSIG ( + 34.5kPa)1 − Expansion Valve SystemsThe following procedures are intended as a general guidefor use with expansion valve systems only. For best results,indoor temperature should be between 70 °F and 80 °F(21.1 °C and 26.6 °C) . If outdoor temperature is 60 °F (16°C) or above the approach method of charging is used. Ifoutdoor temperature is less than 60 °F (16 °C) thesubcooling method of charging is used. Slight variations incharging temperature and pressure should be expected.Large variations may indicate a need for further servicing.APPROACH METHOD (TXV SYSTEMS)(Ambient Temperature of 60F [16C] or Above)1 − Connect gauge manifold. Connect an uprightHCFC22 drum to center port of gauge manifold.2 − Record outdoor air (ambient) temperature.3 − Operate indoor and outdoor units in cooling mode.Allow outdoor unit to run until system pressuresstabilize.4 − Make sure thermometer well is filled with mineral oilbefore checking liquid line temperature.5 − Place thermometer in well and read liquid linetemperature. Liquid line temperature should bewarmer than the outdoor air temperature. Tables 11and 12 shows how many degrees warmer the liquidline temperature should be.Add refrigerant to lower the liquid line temperature.Recover refrigerant to raise the liquid linetemperature.Add refrigerant slowly as the unit approaches thecorrect temperature. This will allow refrigerant tostabilize allowing the correct temperature to be read.TABLE 11APPROACH METHODAMBIENT TEMPERATURE OF 60 F (16 C) ORLiquid ABOVE Line °F Warmer Than OutsideModel(Ambient) TemperatureHP29−21110°F (5.6°C)HP29−26113°F (7.2°C)HP29−31116°F (8.9°C)HP29−41112°F (6.6°C)HP29−46113°F (7.2°C)HP29−51116°F (8.9°C)HP29−65118°F (10°C)TABLE 12APPROACH METHODAMBIENT TEMPERATURE OF 60 F (16 C) ORModelLiquid ABOVE Line °F Warmer Than Outside(Ambient) TemperatureHP29−01810°F (5.6°C)HP29−02413°F (7.2°C)HP29−0308F (4.4C)HP29−03613°F (7.2°C)HP29−04213°F (7.2°C)HP29−04815F (8.3C)HP29−0608F (4.4C)SUBCOOLING METHOD (TXV SYSTEMS)(Ambient Temperature Below 60F [16C]NOTE- It may be necessary to restrict air flow in order toreach liquid pressures in the 200-250 psig range whichare required for checking charge. The indoor temperatureshould be above 70F(21C). Block equal sections of airintake panels as shown in figure 16, moving obstructionssideways until liquid pressures in the 200-250 psig rangeare reached.BLOCKING OUTDOOR COILBlock outdoor coil one side at a timewith cardboard or plastic sheets untilproper testing pressures are reached.CARDBOARD OR PLASTIC SHEETFIGURE 161 − Connect gauge manifold. Connect an uprightHCFC22 drum to center port of gauge manifold.2 − Operate indoor and outdoor units in cooling mode.Allow outdoor unit to run until system pressuresstabilize.3 − Make sure thermometer well is filled with mineral oilbefore checking liquid line temperature.4 − Read liquid line pressure and convert to condensingtemperature using temperature/ pressureconversion chart.Condensing temperature (read from gauges) shouldbe warmer than the liquid line temperature.5 − Place thermometer in well and read liquid linetemperature. Tables 13 and 14 shows how muchwarmer the condensing temperature should be.Add refrigerant to lower liquid line temperature.Recover refrigerant to raise liquid line temperature.6 − When unit is properly charged liquid linepressures should approximate those given intables 15 and 16 .Page 14
TABLE 13SUBCOOLING METHODAMBIENT TEMPERATURE BELOW 60 F (16 C)Model Condensing Temp°F Warmer Than Liquid LineHP29−2118°F (4.4°C)HP29−2616°F (3.3°C)HP29−31110°F (5.6°C)HP29−4118°F (4.4°C)HP29−46112°F (6.7°C)HP29−51113°F (7.2°C)HP29−6515°F (2.8°C)TABLE 14SUBCOOLING METHODAMBIENT TEMPERATURE BELOW 60 F (16 C)Model Condensing Temp°F Warmer Than Liquid LineHP29−018HP29−024HP29−030HP29−036HP29−042HP29−048HP29−0608°F (4.4°C)4F (2.2C)11F (6.1)10°F (5.6°C)12°F (6.7°C)7F (3.9C)10°F (5.6°C)TABLE 15HP29 NORMAL OPERATING PRESSURES*HP29−211 HP29−261 HP29−311 HP29−411 HP29−461 HP29−511 HP29−651OUTDOORCOIL LIQ. VAP. LIQ. VAP. LIQ. VAP. LIQ. VAP. LIQ. VAP. LIQ. VAP. LIQ. VAP.ENTERINGAIR + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10TEMPERATUREPSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG65° F (TXV) 148 71 156 70 165 73 171 68 173 69 163 74 166 7175° F (TXV) 171 74 182 72 195 75 197 70 203 71 191 75 195 7385° F (TXV) 200 76 210 74 220 77 228 72 233 73 225 76 227 7495° F (TXV) 230 78 241 75 254 79 261 74 267 75 259 78 261 76105° F (TXV) 263 81 275 78 292 81 299 77 307 77 295 79 302 78*These are typical pressures only. Indoor evaporator match up, indoor air quality and evaporator load will cause the pressures to vary.TABLE 16HP29 NORMAL OPERATING PRESSURESOUTDOOR HP29-018 HP29-024 HP29-030 HP29−036 HP29-042 HP29-048 HP29-060COIL AIRMODE ENTERING LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC.TEMP. +10 +5 +10 +5 +10 +5 +10 +5 +10 +5 +10 +5 +10 +5F (C) PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG75 (24) 171 74 182 72 184 71 184 74 180 71 180 70 183 72Cooling85 (29) 200 76 210 74 214 72 215 75 205 74 210 70 214 73TXVOnly 95 (35) 230 78 241 75 246 74 249 76 245 75 240 71 248 75105 (41) 263 81 275 78 282 45 285 76 280 76 280 72 285 7720 (−7) 166 33 170 28 186 28 170 27 180 30 175 25 186 2530 (−1) 177 42 184 36 198 36 180 38 190 40 185 35 200 32Heating40 (4) 188 51 194 42 210 43 230 50 195 47 195 43 212 4250 (10) 200 61 212 56 218 53 240 55 205 54 206 52 224 50* These are typical pressures only. Indoor evaporator match up, indoor air quality and evaporator load will cause the pressures to vary.IMPORTANTUse tables 15 and 16 as a general guide forperforming maintenance checks. Table is not aprocedure for charging the system. Minor variationsin pressures may be expected due to differences ininstallations. Significant deviations may mean thesystem is not properly charged or that a problemexists with some component in the system. Usedprudently, tables 15 and 16 could serve as a usefulservice guide.E − Oil ChargeRefer to tables 6 and 7 on page 7.V − MAINTENANCEAt the beginning of each heating or cooling season, thesystem should be cleaned as follows:A − Outdoor Unit1 − Clean and inspect outdoor coil. (Coil may beflushed with a water hose).2 − Visually inspect all connecting lines, joints andcoils for evidence of oil leaks.Page 15IMPORTANTIf insufficient heating or cooling occurs, the unitshould be gauged and refrigerant chargechecked.B − Indoor Coil1 − Clean coil if necessary.2 − Check connecting lines and coil for evidence of oilleaks.3 − Check condensate line and clean if necessary.C − Indoor Unit1 − Clean or change filters.2 − Bearings are pre-lubricated and need no furtheroiling.3 − Check all wiring for loose connections.4 − Check for correct voltage at unit.5 − Check amp−draw on blower motor.Unit nameplate_________Actual_________.
- Page 1: Service LiteratureCorp. 9709−L5Re
- Page 5 and 6: 3 − Potential Relay K31 (Start)Al
- Page 7 and 8: 9 − Defrost SystemUnits built Apr
- Page 9 and 10: B − Compressor (Reciprocating & S
- Page 11 and 12: IMPORTANTService valves are closed
- Page 13: IV − CHARGINGUnit charge is based
- Page 17 and 18: REFRIGERANT LINE SETS:HOW TO INSTAL
- Page 19 and 20: HP29 SINGLE-PHASE WITH RECIPROCATIN
- Page 21 and 22: HP29 SINGLE−PHASE WITH SCROLL COM
- Page 23 and 24: HP29 SINGLE−PHASE WITH SCROLLCOMP
- Page 25 and 26: HP29 THREE−PHASE WITH RECIPROCATI
- Page 27: HP29 THREE-PHASE OPERATING SEQUENCE
TABLE 13SUBCOOLING METHODAMBIENT TEMPERATURE BELOW 60 F (16 C)Model Condensing Temp°F Warmer Than Liquid Line<strong>HP29</strong>−2118°F (4.4°C)<strong>HP29</strong>−2616°F (3.3°C)<strong>HP29</strong>−31110°F (5.6°C)<strong>HP29</strong>−4118°F (4.4°C)<strong>HP29</strong>−46112°F (6.7°C)<strong>HP29</strong>−51113°F (7.2°C)<strong>HP29</strong>−6515°F (2.8°C)TABLE 14SUBCOOLING METHODAMBIENT TEMPERATURE BELOW 60 F (16 C)Model Condensing Temp°F Warmer Than Liquid Line<strong>HP29</strong>−018<strong>HP29</strong>−024<strong>HP29</strong>−030<strong>HP29</strong>−036<strong>HP29</strong>−042<strong>HP29</strong>−048<strong>HP29</strong>−0608°F (4.4°C)4F (2.2C)11F (6.1)10°F (5.6°C)12°F (6.7°C)7F (3.9C)10°F (5.6°C)TABLE 15<strong>HP29</strong> NORMAL OPERATING PRESSURES*<strong>HP29</strong>−211 <strong>HP29</strong>−261 <strong>HP29</strong>−311 <strong>HP29</strong>−411 <strong>HP29</strong>−461 <strong>HP29</strong>−511 <strong>HP29</strong>−651OUTDOORCOIL LIQ. VAP. LIQ. VAP. LIQ. VAP. LIQ. VAP. LIQ. VAP. LIQ. VAP. LIQ. VAP.ENTERINGAIR + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10TEMPERATUREPSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG65° F (TXV) 148 71 156 70 165 73 171 68 173 69 163 74 166 7175° F (TXV) 171 74 182 72 195 75 197 70 203 71 191 75 195 7385° F (TXV) 200 76 210 74 220 77 228 72 233 73 225 76 227 7495° F (TXV) 230 78 241 75 254 79 261 74 267 75 259 78 261 76105° F (TXV) 263 81 275 78 292 81 299 77 307 77 295 79 302 78*These are typical pressures only. Indoor evaporator match up, indoor air quality and evaporator load will cause the pressures to vary.TABLE 16<strong>HP29</strong> NORMAL OPERATING PRESSURESOUTDOOR <strong>HP29</strong>-018 <strong>HP29</strong>-024 <strong>HP29</strong>-030 <strong>HP29</strong>−036 <strong>HP29</strong>-042 <strong>HP29</strong>-048 <strong>HP29</strong>-060COIL AIRMODE ENTERING LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC.TEMP. +10 +5 +10 +5 +10 +5 +10 +5 +10 +5 +10 +5 +10 +5F (C) PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG PSIG75 (24) 171 74 182 72 184 71 184 74 180 71 180 70 183 72Cooling85 (29) 200 76 210 74 214 72 215 75 205 74 210 70 214 73TXVOnly 95 (35) 230 78 241 75 246 74 249 76 245 75 240 71 248 75105 (41) 263 81 275 78 282 45 285 76 280 76 280 72 285 7720 (−7) 166 33 170 28 186 28 170 27 180 30 175 25 186 2530 (−1) 177 42 184 36 198 36 180 38 190 40 185 35 200 32Heating40 (4) 188 51 194 42 210 43 230 50 195 47 195 43 212 4250 (10) 200 61 212 56 218 53 240 55 205 54 206 52 224 50* These are typical pressures only. Indoor evaporator match up, indoor air quality and evaporator load will cause the pressures to vary.IMPORTANTUse tables 15 and 16 as a general guide forperforming maintenance checks. Table is not aprocedure for charging the system. Minor variationsin pressures may be expected due to differences ininstallations. Significant deviations may mean thesystem is not properly charged or that a problemexists with some component in the system. Usedprudently, tables 15 and 16 could serve as a usefulservice guide.E − Oil ChargeRefer to tables 6 and 7 on page 7.V − MAINTENANCEAt the beginning of each heating or cooling season, thesystem should be cleaned as follows:A − Outdoor Unit1 − Clean and inspect outdoor coil. (Coil may beflushed with a water hose).2 − Visually inspect all connecting lines, joints andcoils for evidence of oil leaks.Page 15IMPORTANTIf insufficient heating or cooling occurs, the unitshould be gauged and refrigerant chargechecked.B − Indoor Coil1 − Clean coil if necessary.2 − Check connecting lines and coil for evidence of oilleaks.3 − Check condensate line and clean if necessary.C − Indoor Unit1 − Clean or change filters.2 − Bearings are pre-lubricated and need no furtheroiling.3 − Check all wiring for loose connections.4 − Check for correct voltage at unit.5 − Check amp−draw on blower motor.Unit nameplate_________Actual_________.
Change language