Lenox XC14 System Operation, Normal Operating Pressures Liquid +10 and Suction +5 psig

Page 28

Table 4. Normal Operating Pressures (Liquid +10 and Suction +5 psig)

Use this table to perform maintenance checks; it is not a procedure for charging the

IMPORTANT system. Minor variations in these pressures may be due to differences in installations. Significant deviations could mean that the system is not properly charged or that a

problem exists with some component in the system.

Model

−018

−024

−030

−036

−041

−042

−047

−048

−060

 

 

 

 

 

 

 

 

 

 

**Temp.

Liquid /

Liquid /

Liquid /

Liquid /

Liquid /

Liquid /

Liquid /

Liquid /

Liquid /

5F (5C)

Suction

Suction

Suction

Suction

Suction

Suction

Suction

Suction

Suction

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Expansion Valve (TXV)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

65 (18)

230 / 138

225 / 135

226 / 129

238 / 132

233 / 142

236 / 138

233 / 139

238 / 136

239 / 133

 

 

 

 

 

 

 

 

 

 

70 (21)

244 / 139

242 / 137

241 / 131

254 / 135

239 / 142

253 / 140

252 / 140

256 / 138

258 / 135

 

 

 

 

 

 

 

 

 

 

75 (24)

265 / 140

260 / 138

259 / 134

273 / 138

256 / 143

273 / 141

272 / 141

277 / 139

278 / 136

 

 

 

 

 

 

 

 

 

 

80 (27)

286 / 140

282 / 140

281 / 138

293 / 140

278 / 144

296 / 142

294 / 142

299 / 140

300 / 137

 

 

 

 

 

 

 

 

 

 

85 (29)

307 / 142

304 / 141

301 / 140

316 / 142

299 / 145

318 / 143

315 / 142

320 / 139

323 / 138

 

 

 

 

 

 

 

 

 

 

90 (32)

330 / 143

326 / 142

324 / 141

340 / 143

321 / 145

341 / 144

338 / 144

343 / 140

346 / 139

 

 

 

 

 

 

 

 

 

 

95 (35)

351 / 144

351 / 142

348 / 142

366 / 144

343 / 146

366 / 146

361 / 144

369 / 141

370 / 140

 

 

 

 

 

 

 

 

 

 

100 (38)

380 / 144

376 / 144

372 / 143

392 / 145

366 / 147

392 / 147

387 / 144

395 / 142

396 / 142

 

 

 

 

 

 

 

 

 

 

105 (41)

407 / 145

403 / 145

399 / 144

420 / 147

389 / 148

417 / 148

413 / 145

422 / 144

415 / 143

 

 

 

 

 

 

 

 

 

 

110 (43)

436 / 146

433 / 145

428 / 145

449 / 148

421 / 149

445 / 149

442 / 148

450 / 146

449 / 145

 

 

 

 

 

 

 

 

 

 

115 (45)

466 / 147

463 / 147

456 / 146

480 / 149

452 / 151

475 / 151

465 / 148

481 / 148

476 / 147

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fixed Orifice (RFC)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

65 (18)

232 / 124

228 / 125

229 / 128

241 / 131

228 / 131

248 / 135

232 / 125

240 / 126

244 / 125

 

 

 

 

 

 

 

 

 

 

70 (21)

248 / 127

244 / 127

243 / 129

258 / 134

245 / 135

266 / 138

249 / 129

260 / 129

263 / 128

 

 

 

 

 

 

 

 

 

 

75 (24)

267 / 131

261 / 131

261 / 132

277 / 136

263 / 138

285 / 141

268 / 133

281 / 133

281 / 131

 

 

 

 

 

 

 

 

 

 

80 (27)

286 / 135

284 / 134

284 / 135

298 / 139

284 / 141

305 / 143

286 / 136

301 / 135

303 / 134

 

 

 

 

 

 

 

 

 

 

85 (29)

307 / 138

303 / 137

305 / 138

321 / 141

306 / 144

327 / 145

312 / 140

324 / 138

324 / 136

 

 

 

 

 

 

 

 

 

 

90 (32)

328 / 141

325 / 140

327 / 140

342 / 143

327 / 146

349 / 147

332 / 142

346 / 140

347 / 139

 

 

 

 

 

 

 

 

 

 

95 (35)

351 / 143

347 / 142

349 / 142

366 / 145

348 / 148

372 / 149

357 / 144

371 / 142

370 / 141

 

 

 

 

 

 

 

 

 

 

100 (38)

375 / 146

370 / 144

372 / 144

392 / 147

372 / 149

396 / 150

379 / 146

395 / 144

394 / 143

 

 

 

 

 

 

 

 

 

 

105 (41)

400 / 148

394 / 146

396 / 146

416 / 149

395 / 151

421 / 152

406 / 149

420 / 146

418 / 145

 

 

 

 

 

 

 

 

 

 

110 (43)

426 / 150

420 / 148

422 / 148

446 / 151

424 /153

447 / 153

430 / 150

447 / 148

444 / 146

 

 

 

 

 

 

 

 

 

 

115 (46)

457 / 153

447 / 150

449 / 150

480 / 152

453 / 155

476 / 154

460 / 152

473 / 150

471 / 147

 

 

 

 

 

 

 

 

 

 

*Values shown are typical pressures; indoor unit match up, indoor air quality equipment, and indoor load will cause the pressures to vary. **Temperature of the air entering the outside coil.

System Operation

UNIT COMPONENTS

High Pressure Switch (S4)

XC14 units are equipped with a high-pressure switch that is located in the liquid line of the compressor as illustrated in Unit Dimensions on page 2. The switch is a Single Pole, Single Throw (SPST), manual−reset switch with red cap that is normally closed and removes power from the compressor when discharge pressure rises above factory setting at 590 + 10 psi.

Thermal Protection Switch (S5)

Mounted

This unit is equipped with a discharge line mounted temperature switch that prevents compressor damage due to loss of charge. The switch is located on the discharge line (see figure 1 for location). When the switch senses a discharge line temperature of 220°F +/−5°F, it opens to shut off compressor operation. The auto−reset switch closes when the discharge line temperature drops below 180°F +/−9°F and the compressor is re−energized. This single−pole, single−throw (SPST) bi−metallic switch is

wired in series with the 24V Y input signal to control compressor operation.

Thermal Protection Switch (S173)

Mounted

Some units are equipped with a compressor mounted normally closed temperature switch that prevents compressor damage due to overheating caused by internal friction. The switch is located on top of the compressor casing (see figure 1). This switch senses the compressor casing temperature and opens at 239−257°F (115°C−125°C) to shut off compressor operation. The auto−reset switch closes when the compressor casing temperature falls to 151−187°F (66°C−86°C), and the compressor is re−energized. This single−pole, single−throw (SPST) bi−metallic switch is wired in series with the 24V Y input signal to control compressor operation.

Crankcase Thermostat (S40) (−041, −047, −048 and

−060 units only)

Compressor in the above reference units are equipped with a 70 watt, belly band type crankcase heater. HR1 prevents liquid from accumulating in the compressor. HR1 is controlled by a thermostat located on the liquid line.

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506636−01

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Contents Table of Contents GeneralShipping and Packing List AIR ConditionerModel Number Identification Unit Dimensions − Inches mm230 Typical Unit Parts Arrangement Plumbing and Switches ComponentsControl Panel Operating Gauge Set and Service Valves Using Manifold Gauge SETOperating Service Valves Torque RequirementsOperating Angle Type Service Valve Operating Ball Type Service ValveTo Access Service Port Reinstall Stem CapRecovering Refrigerant from Existing System 1DISCONNECT PowerRecovering Refrigerant 2CONNECT Manifold Gauge SETUnit Placement Clearance on ALL SidesPositioning Considerations Placing Unit on SlabDetail a Outside Unit Placement Detail C Elevated Slab Mounting using Feet ExtendersDetail D Slab Side Mounting Detail E Deck Top MountingRemoving and Installing Panels Louvered Panel InstallationRoof Mounting Louvered Panel RemovalRefrigerant Line SET New or Replacement Line SetRefrigerant Line Set Refrigerant Line SET From Vertical to Horizontal Refrigerant Line SET Alling Horizontal RunsBrazing Connections Brazing Procedures 1CUT and DeburWrap Service Valves Flow Nitrogen6BRAZE Line SET 7PREPARATION for Next StepInstalling Indoor Expansion Valve Flushing Line Set and Indoor CoilInstalling Indoor Metering Device Indoor Expansion Valve InstallationSensing Bulb Installation Equalizer Line InstallationLeak Test Line Set and Indoor Coil Leak TestEvacuating Line Set and Indoor Coil Evacuating SystemSize Circuit and Install Disconnect 2INSTALL ThermostatElectrical 24VAC TransformerVAC Control Wiring Diagrams Field Installed Typical Factory Wiring Diagram Interlink Compressor Typical Unit Wiring Diagram Connections for Testing and Charging Servicing Units Delivered Void of ChargeUnit Start−Up System RefrigerantDetermining Charge Method Which indoorMetering Device?Checking AIR Flow AT Indoor Coil Calculating System Charge for Outdoor Unit Void of ChargeAbove Below40ºF SHº Superheat Values +/−5ºFNormal Operating Pressures Liquid +10 and Suction +5 psig System OperationUnit Components Maintenance Indoor UnitIndoor Coil Unit Nameplate ActualStart−Up and Performance Checklist Installer CityJob Name Job no Date Job Location City State

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