Lennox Signature XP19-024 Installation Instructions Manual Download

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Page 20

505331M 06/09

Table 8. Normal Operating Pressure − 10 and Vapor

+5 PSIG*

IMPORTANT

Minor variations in these pressures may be
expected due to differences in installations.
Significant differences could mean that the system
is not properly charged or that a problem exists with
some component in the system.

F (

C)**

XP19−024

XP19−036

XP19−048

XP19−060

Liq

Vap

Liq

Vap

Liq

Vap

Liq

Vap

First Stage (Low Capacity)

40 (4.4)

314

100

316

350

365

50 (10)

334

120

334

117

367

111

388

112

Second Stage (High Capacity)

20 (−7.0)

304

294

314

346

30 (−1.0)

323

313

331

362

40 (4.4)

342

329

358

382

50 (10)

364

116

344

109

384

107

409

106

First Stage (Low Capacity)

65 (18.3)

226

152

230

148

210

136

234

135

75 (23.9)

262

151

267

150

242

138

274

137

85 (29.4)

304

152

309

153

286

140

314

142

95 (35.0)

351

155

355

155

328

142

361

147

105 (40.6)

400

158

404

157

374

144

413

147

115 (49.0)

454

161

460

159

426

146

470

149

Second Stage (High Capacity)

65 (18.3)

228

146

236

144

227

114

237

131

75 (23.9)

267

148

275

145

265

123

276

133

85 (29.4)

309

149

318

148

306

132

320

135

95 (35.0)

358

151

365

150

348

138

369

138

105 (40.6)

410

152

416

153

397

141

423

140

115 (49.0)

465

154

473

155

453

143

482

144

*These are most−popular−match−up pressures. Indoor match up,
indoor air quality, and indoor load cause pressures to vary.

**Temperature of the air entering the outside coil.

Table 9

HFC−410A Temperature (°F) − Pressure (Psig)

°F

Psig

°F

Psig

°F

Psig

°F

Psig

100.8

178.5

290.8

125

445.9

102.9

181.6

295.1

126

451.8

105.0

184.3

299.4

127

457.6

107.1

187.7

303.8

128

463.5

109.2

190.9

308.2

129

469.5

111.4

194.1

312.7

130

475.6

113.6

197.3

100

317.2

131

481.6

115.8

200.6

101

321.8

132

487.8

118.0

203.9

102

326.4

133

494.0

120.3

207.2

103

331.0

134

500.2

122.6

210.6

104

335.7

135

506.5

125.0

214.0

105

340.5

136

512.9

127.3

217.4

106

345.3

137

519.3

129.7

220.9

107

350.1

138

525.8

132.2

224.4

108

355.0

139

532.4

134.6

228.0

109

360.0

140

539.0

137.1

231.6

110

365.0

141

545.6

139.6

235.3

111

370.0

142

552.3

142.2

239.0

112

375.1

143

559.1

144.8

242.7

113

380.2

144

565.9

147.4

246.5

114

385.4

145

572.8

150.1

250.3

115

390.7

146

579.8

152.8

254.1

116

396.0

147

586.8

155.5

258.0

117

401.3

148

593.8

158.2

262.0

118

406.7

149

601.0

161.0

266.0

119

412.2

150

608.1

163.9

270.0

120

417.7

151

615.4

166.7

274.1

121

423.2

152

622.7

169.6

278.2

122

428.8

153

630.1

172.6

282.3

123

434.5

154

637.5

175.4

286.5

124

440.2

155

645.0

INSTALLING SERVICE VALVE CAPS

Disconnect gauge set and re−install all service valve caps.

INSTALL CAPS

OUTDOOR UNIT

SERVICE VALVE

Figure 33. Installing Service Valve Port Caps

Summary of Contents for Signature XP19-024

Page 1: ... Lennox Signature Collection XP19 Series Units HEAT PUMPS 505 331M 06 09 Supersedes 05 09 Table of Contents Shipping and Packing List 1 Unit Dimensions 2 XP19 Heat Pumps 2 General Information 2 Recovering Refrigerant from Existing System 4 Removing Existing Outdoor Unit 5 Positioning New Outdoor Unit 5 Removing Panels 6 New or Replacement Line Set 8 Brazing Connections 9 Removing Indoor Unit Meter...

Page 2: ...ol is known to the State of California to cause cancer Fiberglass wool may also cause respiratory skin and eye irritation To reduce exposure to this substance or for further information consult material safety data sheets available from address shown below or contact your supervisor Lennox Industries Inc P O Box 799900 Dallas TX 75379 9900 XP19 Heat Pumps3 The XP19 Heat Pumps which will also be re...

Page 3: ...rounding or breaking off the wrench or stripping the valve stem recess 1 2 3 4 5 6 7 8 9 10 11 12 1 6 TURN 1 2 3 4 5 6 7 8 9 10 11 12 1 12 TURN Figure 2 Cap Tightening Distances IMPORTANT To prevent stripping of the various caps used the appropriately sized wrench should be used and fitted snugly over the cap before tightening To Access Angle Type Service Port A service port cap protects the servi...

Page 4: ...d wrench to turn an additional 1 6 turn clockwise as illustrated in Figure 2 BALL SHOWN CLOSED SERVICE PORT CORE TO INDOOR UNIT TO OUTDOOR UNIT TO OPEN ROTATE STEM COUNTERCLOCKWISE 90 TO CLOSE ROTATE STEM CLOCKWISE 90 SERVICE PORT SERVICE PORT CAP STEM CAP VALVE STEM OPEN TO LINE SET WHEN VALVE IS CLOSED TO BOTH LINE SET AND UNIT WHEN VALVE IS OPEN Figure 6 Ball Type Service Valve To Open and Clos...

Page 5: ...er to unit and use a recovery machine to recover any refrigerant left in the indoor coil and line set Perform the following task 1 Start the existing HCFC 22 system in the cooling mode and close the liquid line valve 2 Pump as much of the existing HCFC 22 refrigerant with the compressor back into the outdoor unit until you have reached the limitations of the outdoor system Turn the outdoor unit ma...

Page 6: ...e 7 ELEVATING THE UNIT This unit is outfitted with elongated support feet as illustrated in Figure 11 which uses a similar method for elevating the unit LEG DETAIL BASE 2 50 8MM SCH 40 FEMALE THREADED ADAPTER Figure 11 Elevated Slab Mounting using Feet Extenders If additional elevation is necessary raise the unit by extending the length of the unit support feet This may be achieved by using a 2 SC...

Page 7: ... unit as possible Then in a continuous motion S Slightly rotate and guide the lip of top tab inward as illustrated in Figure 13 details A and C then upward into the top slot of the hinge corner post S Rotate panel to vertical to fully engage all tabs S Holding the panel s hinged side firmly in place close the right hand side of the panel aligning the screw holes When panel is correctly positioned ...

Page 8: ...nnections to the indoor unit coil flare or sweat connections Use Lennox L15 sweat non flare series line set or use field fabricated refrigerant lines as listed in Table 2 Table 2 Refrigerant Line Set Model Field Connections Recommended Line Set Liquid Line Suction Line Liquid Line Suction Line L15 Line Set 024 036 048 3 8 10 mm 7 8 22 mm 3 8 10 mm 7 8 22 mm L15 65 15 ft 50 ft 4 6 m 15 m 060 3 8 10...

Page 9: ...O SUCTION LINE WALL STUD LIQUID LINE METAL SLEEVE SUCTION LINE WRAPPED IN ARMAFLEX AUTOMOTIVE MUFFLER TYPE HANGER Figure 18 Refrigerant Line Set Transition from Vertical to Horizontal Brazing Connections10 Use the following procedure to braze the line set to the new air conditioner unit Figure 19 is provided as a general guide for preparing to braze the line set to the air conditioner unit WARNING...

Page 10: ...liquid line to the liquid line service valve Turn off nitrogen flow Repeat procedure starting at paragraph 4 for brazing the suction line to the suction service valve 7 After all connections have been brazed disconnect manifold gauge set the from service ports cool down piping with wet rag and remove all wrappings Do not reinstall cores until after evacuation procedures Reinstall service caps if d...

Page 11: ...liquid line to the indoor unit s liquid line orifice housing Flushing the System12 IMPORTANT The line set and indoor unit coil must be flushed with at least the same amount of clean refrigerant that previously charged the system Check the charge in the flushing cylinder before proceeding IMPORTANT If this unit is being matched with an approved line set or indoor unit coil which was previously char...

Page 12: ...m on the system 5 Close the valve on the inverted HCFC 22 drum and the gauge set valves Pump the remaining refrigerant out of the recovery machine and turn the machine off Installing New Indoor Metering Device13 XP19 units use CTXV for metering refrigerant only This section provides instructions on installing CTXV refrigerant metering device 1 2 3 4 5 6 7 8 9 10 11 12 1 8 TURN 1 2 3 4 5 6 7 8 9 10...

Page 13: ...TION LINE FLARE NUT COPPER FLARE SEAL BONNET MALE BRASS EQUALIZER LINE FITTING FLARE SEAL CAP OR Figure 27 Copper Flare Seal Bonnet Removal IMPORTANT When removing the flare nut ensure that the copper flare seal bonnet is removed 8 Connect the equalizer line from the TXV to the equalizer suction port on the suction line Finger tighten the flare nut plus 1 8 turn 7 ft lbs as illustrated in Figure 2...

Page 14: ...gauges from service ports Evacuating the System15 Evacuating the system of non condensables is critical for proper operation of the unit Non condensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system Non condensables and water suction combine with refrigerant to produce substances that corrode copper piping and...

Page 15: ...nder C Reinstall service valve cores by removing manifold hose form service valve Quickly install core with core tool while maintaining a positive system pressure D Replace the stem caps and secure finger tight then tighten an additional one sixth 1 6 of a turn as illustrated in Figure 2 Servicing Units Delivered Void of Charge16 If the outdoor unit is void of refrigerant clean the system using th...

Page 16: ... Type less than 100 30m 18 color coded temperature rating 35ºC minimum more than 100 30m 16 3 Install room thermostat ordered separately on an inside wall approximately in the center of the area and 5 feet 1 5 m from the floor Do not install on an outside wall or where sunlight drafts or vibrations affect it 4 Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor uni...

Page 17: ...alculate the total refrigerant charge Amount specified on nameplate Adjust amount for variation in line set length listed on Table in Figure 31 Additional charge specified per indoor unit match up listed in Tables 4 through 7 Total charge 1 Determine the desired DT Measure entering air temperature using dry bulb A and wet bulb B DT is the intersecting value of A and B in the Table see triangle 2 F...

Page 18: ...ing mode When the outdoor ambient temperature is 60 F 15 C and above Target subcooling values second stage high capacity in Table 8 are based on 70 to 80 F 21 27 C indoor return air temperature if necessary operate heating to reach that temperature range then set thermostat to cooling mode setpoint to 68ºF 20ºC which should call for second stage high capacity cooling When pressures have stabilized...

Page 19: ...X40UHV 036 14 6 0 5 CBX40UHV 042 048 6 6 1 5 CH33 44 48B 12 5 0 13 CH33 48 12 5 0 13 CR33 48 30 5 0 0 CR33 50 60 60 15 4 1 5 Table 8 XP19 036 Continued INDOOR HEAT MATCH UP PUMP Target Subcooling Heating Cooling 5ºF 1ºF Add charge CX34 48 SN before SN 6007K 31 7 0 0 CX34 48 SN 6007K and after 10 8 0 0 CX34 44 48 30 5 0 0 CX34 49 6 6 1 5 CX34 50 60C 12 5 0 13 CX34 60D 8 5 0 15 CX34 62D 6 6 1 5 Tabl...

Page 20: ...ause pressures to vary Temperature of the air entering the outside coil Table 9 HFC 410A Temperature F Pressure Psig F Psig F Psig F Psig F Psig 32 100 8 63 178 5 94 290 8 125 445 9 33 102 9 64 181 6 95 295 1 126 451 8 34 105 0 65 184 3 96 299 4 127 457 6 35 107 1 66 187 7 97 303 8 128 463 5 36 109 2 67 190 9 98 308 2 129 469 5 37 111 4 68 194 1 99 312 7 130 475 6 38 113 6 69 197 3 100 317 2 131 4...

Page 21: ...ign and capacity Lennox System Operation Monitor LSOM 100034 1 20 The diagnostic indicator detects the most common fault conditions in the air conditioning system When an abnormal condition is detected the module communicates the specific condition through its ALERT and TRIP lights The module is capable of detecting both mechanical and electrical system problems IMPORTANT This monitor does not pro...

Page 22: ...ellow Flash Code 1 Long Run Time Compressor is running extremely long run cycles 1 Low refrigerant charge 2 Evaporator blower is not running S Check blower relay coil and contacts S Check blower motor capacitor S Check blower motor for failure or blockage S Check evaporator blower wiring and connectors S Check indoor blower control board S Check thermostat wiring for open circuit 3 Evaporator coil...

Page 23: ...in compressor start wiring or connections S Check wiring and connectors between supply and the compressor S terminal 3 Compressor start winding is damaged S Check compressor motor winding resistance Yellow Flash Code 7 Open Run Circuit Current only in start circuit 1 Open circuit in compressor start wiring or connections S Check wiring and connectors between supply and the compressor R terminal 2 ...

Page 24: ...he auto reset event values for low and high pressure thresholds High Pressure auto reset trip at 590 psig reset at 418 Low Pressure auto reset trip at 25 psig reset at 40 FIVE STRIKE LOCKOUT SAFETY FUNCTION The five strike lockout safety function is designed to protect the unit s compressor from damage The DCB looks for 24VAC on it s Y1 terminal When the Y1 input is see 24VAC then internal control...

Page 25: ...ed sensor or high discharge temperatures Code on board is Discharge Line Temperature Fault and Lockout 2 If the board recognizes five temperature sensor range faults during a single Y1 compressor demand it reverts to a lockout mode and displays the appropriate code The board detects open sensor or out of temperature sensor range This fault is detected by allowing the unit to run for 90 seconds bef...

Page 26: ...fferential which is required to allow a defrost cycle Defrost Mode The following paragraphs provide a detailed description of the defrost system operation DETAILED DEFROST SYSTEM OPERATION Defrost Cycles The demand defrost control board initiates a defrost cycle based on either frost detection or time S Frost Detection If the compressor runs longer than 30 minutes and the actual difference between...

Page 27: ... to the Demand Defrost Control Y1 Active Place a jumper on TEST pins for longer than one second but less than two seconds Clears any short cycle lockout and five strike fault lockout function if applicable No other functions will be executed and unit will continue in the mode it was operating Place a jumper on TEST pins for more than two seconds Clears any short cycle lockout and five strike fault...

Page 28: ...set at 50 F 10 C If the temperature jumper is not installed the default termination temperatureis 90 F 32 C P2 RL 24VAC output for external K229 relay to control blower operation during defrost heat pump inactive mode and a call for second stage gas heat furnace operations C 24VAC system common W Out 24VAC output to furnace control to begin furnace heating operation R 24VAC system power input W In...

Page 29: ...ents OFF ON Low Pressure Discharge Sensor Lockout SLOW Flash OFF High Pressure Fault ON OFF High Pressure Discharge Sensor Lockout SLOW Flash ON Discharge Line Temperature Fault This code detects shorted sensor or high discharge temperatures If the discharge line temperature exceeds a temperature of 300ºF 148ºC during compressor operation the board will de energize the compressor contactor output ...

Page 30: ...etween low and high capacity and replacement is necessary 12 After testing is complete return unit to original set up Homeowner Information Maintenance25 In order to ensure peak performance your system must be properly maintained Clogged filters and blocked airflow prevent your unit from operating at its most efficient level 1 Air Filter Ask your Lennox dealer to show you where your indoor unit s ...

Page 31: ...peration will be similar Temperature Setting Levers Most heat pump thermostats have two temperature selector levers one for heating and one for cooling Set the levers or dials to the desired temperature setpoints for both heating and cooling Avoid frequent temperature adjustment turning the unit off and back on before pressures equalize puts stress on the unit compressor Fan Switch In AUTO or INT ...

Page 32: ...r Cooling Mode Operation Block outdoor coil to maintain a minimum of 375 psig during testing Heating Mode Operation Block indoor coil to maintain a minimum of 375 psig during testing XP19 Start Up and Performance Checklist27 Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Notes START UP CHECKS Refrigerant Type Rated Load Amps Actual Amps Rated Volts Actual Volts Condenser Fan F...

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