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inspected at least once each year by a qualified service person. To
troubleshoot heating or cooling of units, refer to tables at the back
of the book.
The following are 50GS Cooling Charging Charts:
The following are 50GX Cooling Charging Charts:
NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.

Table 8—Wet Coil Air Delivery (Deduct 10 percent for 208v)*

Horizontal and Downflow Discharge

Unit 50GS018-060

230 AND 460 VOLT

Unit

Motor

Speed

External Static Pressure (in. wg)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

018

Low

Watts

227

212

196

177

165

153

-

-

-

-

-

Cfm

1000

915

825

710

530

340

-

-

-

-

-

Med

Watts

-

-

-

-

-

-

-

-

-

-

-

Cfm

-

-

-

-

-

-

-

-

-

-

-

High

Watts

287

275

266

253

242

234

226

-

-

-

-

Cfm

1150

1032

963

807

698

503

250

-

-

-

-

024

Low

Watts

280

275

270

267

264

262

260

-

-

-

-

Cfm

880

825

765

693

600

450

281

-

-

-

-

Med

Watts

380

375

365

360

355

350

344

335

312

-

-

Cfm

1136

1085

1010

946

865

787

650

495

360

-

-

High

Watts

485

475

470

460

455

445

437

430

415

385

-

Cfm

1415

1332

1266

1180

1100

1000

900

780

480

256

-

030

Low

Watts

280

275

270

267

264

262

260

-

-

-

-

Cfm

880

825

765

693

600

450

281

-

-

-

-

Med

Watts

380

375

365

360

355

350

344

335

312

-

-

Cfm

1136

1085

1010

946

865

787

650

495

360

-

-

High

Watts

485

475

470

460

455

445

437

430

415

385

-

Cfm

1415

1332

1266

1180

1100

1000

900

780

480

256

-

036

Low

Watts

-

470

458

445

430

415

399

384

-

-

-

Cfm

-

1352

1257

1240

1199

1107

1015

924

-

-

-

Med

Watts

-

-

514

501

487

471

455

438

422

-

-

Cfm

-

-

1338

1295

1288

1181

1111

968

813

-

-

High

Watts

-

-

-

646

636

626

614

602

589

-

-

Cfm

-

-

-

1385

1268

1196

1159

1032

948

-

-

042

Low

Watts

-

675

660

650

640

630

620

610

595

580

-

Cfm

-

1387

1326

1275

1204

1142

1081

995

918

850

-

Med

Watts

-

886

855

825

795

778

765

750

735

718

700

Cfm

-

1458

1406

1350

1285

1224

1163

1091

1013

932

870

High

Watts

-

-

-

1000

950

925

910

890

875

855

833

Cfm

-

-

-

1488

1424

1360

1296

1233

1148

1071

1005

048

Low

Watts

-

727

712

700

688

666

644

622

595

569

-

Cfm

-

1640

1600

1575

1505

1450

1390

1300

1205

1145

-

Med

Watts

-

853

836

821

807

782

756

730

699

667

640

Cfm

-

1860

1830

1770

1700

1642

1565

1482

1385

1290

1210

High

Watts

-

979

959

943

927

897

868

838

802

766

730

Cfm

-

2090

2048

1997

1922

1845

1750

1600

1550

1425

1380

060

Low

Watts

1033

949

864

836

822

808

772

737

705

674

642

Cfm

2050

2000

1945

1905

1880

1820

1775

1695

1627

1530

1480

Med

Watts

1084

1054

1024

994

971

955

928

897

867

835

803

Cfm

2248

2179

2110

2058

2000

1932

1885

1829

1740

1638

1569

High

Watts

-

-

1184

1152

1120

1102

1084

1056

1029

997

965

Cfm

-

-

2278

2207

2124

2041

2000

1960

1856

1748

1645

* Air delivery values are based on operating voltage of 230v or 460v, wet coil, without filter or electric heater. Deduct filter and electric heater pressure drops to obtain

static pressure available for ducting.
NOTES:

1. Do not operate the unit at a cooling airflow that is less than 350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporator coil frosting may occur at airflows below

this point.

2. Dashes indicate portions of table that are beyond the blower motor capacity or are not recommended.

19

Summary of Contents for SINGLE PACKAGED ELECTRIC COOLING UNITS 50GS

Page 1: ...IT 24 EVAPORATOR AIRFLOW 25 METERING DEVICE ACUTROL DEVICE 25 LIQUID LINE STRAINER 25 Troubleshooting 25 Start Up Checklist 25 NOTE TO INSTALLER Before the installation READ THESE INSTRUCTIONS CAREFULLY AND COMPLETELY Also make sure the User s Manual and Replacement Guide are left with the unit after installation SAFETY CONSIDERATIONS Installation and servicing of air conditioning equipment can be...

Page 2: ...5A This is necessary for unit drain to function properly Refer to accessory roof curb installation instructions for additional information as required SLAB MOUNT Place the unit on a solid level concrete pad that is a minimum of 4 in thick with 2 in above grade See Fig 5B The slab should extend approximately 2 in beyond the casing on all 4 sides of the unit Do not secure the unit to the slab except...

Page 3: ...82 6 14 0 355 6 15 0 381 0 50GS036 208 230 1 60 208 230 3 60 460 3 60 268 121 6 37 02 940 3 20 0 508 0 14 0 355 6 13 0 330 2 50GS042 208 230 1 60 208 230 3 60 460 3 60 294 133 3 35 02 889 5 19 0 482 6 14 0 355 6 13 0 330 2 50GX024 208 230 1 60 270 122 5 37 02 940 3 18 5 469 9 14 5 368 3 16 0 406 4 50GX030 208 230 1 60 208 230 3 60 291 132 0 39 02 991 1 19 5 495 3 15 5 393 7 17 6 447 0 50GX036 208 ...

Page 4: ... 176 38 98 990 2 19 0 482 6 16 0 406 0 17 0 432 0 50GX042 208 230 1 60 208 230 3 60 460 3 60 321 146 38 98 990 2 20 5 520 7 16 75 425 5 16 6 421 6 50GX048 208 230 1 60 208 230 3 60 460 3 60 326 148 38 98 990 2 19 5 495 3 17 6 447 6 18 0 457 2 50GX060 208 230 1 60 208 230 3 60 460 3 60 399 181 42 98 1091 1 20 5 520 7 16 2 412 8 17 6 447 0 C99006 REQUIRED CLEARANCE FOR OPERATION AND SERVICING INCHES...

Page 5: ...ACunit base Gasketing outer flange Flashing field supplied Roofing mater ial field supplied Cant strip field supplied Provided with roofcurb Roof Duct wo rk field supplied Insulation field supplied Roofcurb Wood nailer Gasketing inner flange Screw NOTE A Roof Curb for Small Cabinet Note A When unit mounting screw is used retainer bracke t must also be used HVAC unit base Gasketing outer flange Fla...

Page 6: ...66 3 55 56 56 58 71 88 106 57 61 64 85 80 108 4 94 94 95 98 97 122 145 88 86 90 110 112 140 TOTAL WEIGHT 254 260 258 268 294 324 389 270 291 299 321 326 399 C00071 1 2 4 3 x y Fig 5A Unit Leveling Tolerances C99065 A B C MAXIMUM ALLOWABLE DIFFERENCE in A B B C A C 1 4 1 4 1 4 Fig 5B Slab Mounting Detail C99096 OPTIONAL RETURN AIR OPENING OPTIONAL SUPPLY AIR OPENING EVAP COIL COND COIL 2 6 ...

Page 7: ...de and bottom of the unit For downshot applications the ductwork can be connected to the roof curb See Fig 2 3 for connection sizes and locations IMPORTANT Use flexible connectors between ductwork and unit to prevent transmission of vibration Use suitable gaskets to ensure weathertight and airtight seal When electric heat is installed use fire proof canvas or similar heat resistant material connec...

Page 8: ...BLOWER Nominal Airflow Cfm Size in Motor HP RPM 600 10x10 1 4 825 800 10x10 1 4 1075 1000 10x10 1 4 1075 1200 11x10 1 2 1075 1400 11x10 3 4 1075 1600 11x10 3 4 1075 2000 11x10 1 0 1100 RETURN AIR FILTERS in Throwaway 20x20 20x20 20x20 20x24 20x24 24x30 24x30 Required filter sizes shown are based on the larger of the ARI Air Conditioning and Refrigeration Institute rated cooling airflow or the heat...

Page 9: ...or maximum required airflow either heating or cooling for unit being installed Avoid abrupt duct size increases or decreases or performance may be affected 13 Adequately insulate and weatherproof all ductwork located outdoors Insulate ducts passing through unconditioned space and use vapor barrier in accordance with latest issue of Sheet Metal and Air Conditioning Contractors National Association ...

Page 10: ...sure lug connection 11 of the compressor contactor 4 Connect L2 to pressure lug connection 23 of the compressor contactor Three phase units 1 Run the high voltage L1 L2 L3 and ground leads into the control box 2 Connect ground lead to chassis ground connection 3 Locate the black and yellow wires connected to the lines side of the contactor 4 Connect field L1 to black wire on connection 11 of the c...

Page 11: ...5 0 20 0 18 1 20 8 26 0 30 0 36 1 41 7 54 2 62 5 72 2 83 3 28 7 28 7 28 7 31 0 37 5 42 5 50 1 57 1 72 7 83 1 95 3 109 2 35 35 35 35 40 45 60 60 80 90 100 110 208 230 3 60 187 254 10 7 85 1 4 4 3 8 5 0 7 5 10 0 11 3 15 0 15 0 19 9 10 4 12 0 20 8 24 1 31 3 36 1 41 6 48 0 18 8 18 8 18 8 20 0 31 1 35 1 44 1 50 1 57 0 65 0 25 25 25 25 35 40 45 60 60 70 460 3 60 414 508 5 3 42 0 8 2 5 10 15 20 6 12 18 2...

Page 12: ... 6 42 6 50 3 57 2 72 8 83 3 95 4 109 3 35 35 35 35 40 45 60 60 80 90 100 110 208 230 3 60 187 253 12 4 88 0 1 6 4 1 3 8 5 0 7 5 10 0 11 3 15 0 15 0 20 0 10 4 12 0 20 8 24 1 31 3 36 1 41 7 48 1 21 2 21 2 21 2 21 2 31 2 35 2 44 2 50 2 57 2 65 3 25 25 25 25 35 40 45 60 60 70 460 3 60 414 506 6 1 44 0 0 9 2 0 5 10 15 20 6 0 12 0 18 0 24 1 10 5 10 5 17 5 25 1 32 6 15 15 20 30 35 048 208 230 1 60 187 25...

Page 13: ...ng cutter and remove component from unit d Carefully unsweat remaining tubing stubs when neces sary Oil can ignite when exposed to torch flame Proceed as follows to inspect and prepare the unit for initial startup 1 Remove access panel 2 Read and follow instructions on all WARNING CAUTION and INFORMATION labels attached to or shipped with unit 3 Make the following inspections a Inspect for shippin...

Page 14: ...mostat SYSTEM switch in OFF position Observe that blower motor starts when FAN switch is placed in ON position and shuts down after 30 second fan time delay expires when FAN switch is placed in AUTO position 2 Place SYSTEM switch in COOL position and FAN switch in AUTO position Set cooling control below room temperature Observe that compressor condenser fan and evaporator blower motors start Obser...

Page 15: ...Fig 12 Wiring Diagram 208 230 60 1 C99003 15 ...

Page 16: ...Fig 13 Wiring Diagram 208 230 60 3 C99004 16 ...

Page 17: ...Fig 14 Wiring Diagram 460 60 3 C99005 17 ...

Page 18: ...speed remove and replace with lead for desired blower motor speed Insulate the removed lead to avoid contact with chassis parts FOR 460 V GE MOTORS For color coding on the 460 v GE motor leads see Table 7 To change the speed of the indoor fan motor IFM remove fan motor speed lead from the time delay relay TDR and replace with the lead for the desired blower motor speed The motor speed lead is atta...

Page 19: ...455 438 422 Cfm 1338 1295 1288 1181 1111 968 813 High Watts 646 636 626 614 602 589 Cfm 1385 1268 1196 1159 1032 948 042 Low Watts 675 660 650 640 630 620 610 595 580 Cfm 1387 1326 1275 1204 1142 1081 995 918 850 Med Watts 886 855 825 795 778 765 750 735 718 700 Cfm 1458 1406 1350 1285 1224 1163 1091 1013 932 870 High Watts 1000 950 925 910 890 875 855 833 Cfm 1488 1424 1360 1296 1233 1148 1071 10...

Page 20: ...96 783 529 036 Low Watts 470 458 445 430 415 399 384 Cfm 1352 1257 1240 1199 1107 1015 924 Med Watts 514 501 487 471 455 438 422 Cfm 1338 1295 1288 1181 1111 968 813 High Watts 646 636 626 614 602 589 Cfm 1385 1268 1196 1159 1032 948 042 Low Watts 625 614 605 593 574 549 518 485 454 Cfm 1540 1510 1473 1396 1348 1288 1192 1124 1037 Med Watts 726 695 661 625 591 561 540 Cfm 1648 1593 1530 1446 1352 ...

Page 21: ...lean when necessary 3 Inspect blower motor and wheel for cleanliness and check lubrication each heating and cooling season Clean when necessary 4 Check electrical connections for tightness and controls for proper operation each heating and cooling season Service when necessary 5 Ensure electric wires are not in contact with refrigerant tubing or sharp metal edges C99037 Fig 15 Cooling Charging Cha...

Page 22: ...he blower wheel and motor annually Disconnect and tag electrical power to the unit before cleaning the blower motor and wheel Failure to adhere to this warning could cause personal injury or death To clean the blower motor and wheel 1 Remove and disassemble blower assembly as follows a Remove unit access panel b Disconnect motor lead from time delay relay TDR Disconnect yellow lead from terminal L...

Page 23: ...wheel and housing with vacuum cleaner using soft brush attach ment Remove grease and oil with mild solvent d Reassemble wheel into housing e Reassemble motor into housing Be sure setscrews are tightened on motor shaft flats and not on round part of shaft f Reinstall unit access panel 3 Restore electrical power to unit Start unit and check for proper blower rotation and motor speeds during heating ...

Page 24: ...r to top cover 2 Turn motor grille assembly upside down on top cover to expose the fan blade 3 Inspect the fan blades for cracks or bends 4 If fan needs to be removed loosen the setscrew and slide the fan off the motor shaft 5 When replacing fan blade position blade so that the hub is 1 8 in away from the motor end 1 8 in of motor shaft will be visible 6 Ensure that setscrew engages the flat area ...

Page 25: ...The heating and or cooling air flow does not require checking unless improper performance is suspected If a problem exists be sure that all supply and return air grilles are open and free from obstructions and that the air filter is clean When necessary refer to Indoor Airflow and Airflow Adjustments section to check the system airflow METERING DEVICE ACUTROL DEVICE This metering device is a fixed...

Page 26: ...use and correct Defective run start capacitor overload or start relay Determine cause and replace Defective thermostat Replace thermostat Faulty condenser fan motor or capacitor Replace Restriction in refrigerant system Locate restriction and remove Compressor operates continuously Dirty air filter Replace filter Unit undersized for load Decrease load or increase unit size Thermostat set too low R...

Page 27: ...ghtness III START UP Supply Voltage L1 L2 C S __________ L2 L3 S R __________ L3 L1 R C __________ Compressor Amps L1 C __________ L2 S __________ L3 R __________ Indoor Evaporator Fan Amps __________ TEMPERATURE Outdoor Condenser Air Temperature __________ DB Return Air Temperature __________ DB __________ WB Cooling Supply Air __________ DB __________ WB PRESSURES Refrigerant Suction __________ ...

Page 28: ...1 50gsgx4si Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations Book 1 6 Tab 6 8 PC 101 Catalog No 535 00130 Printed in U S A Form 50GS GX 4SI Pg 28 9 03 Replaces 50GS GX 3SI ...

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