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RECEIVING AND INSTALLATION

Step 1 — Check Equipment

IDENTIFY UNIT — The unit model number and serial num-
ber are stamped on the unit identification plate. Check this
information against shipping papers.

INSPECT SHIPMENT — Inspect for shipping damage while
unit is still on shipping pallet. If unit appears to be damaged
or is torn loose from its anchorage, have it examined by trans-
portation inspectors before removal. Forward claim papers
directly to transportation company. Manufacturer is not re-
sponsible for any damage incurred in transit.

Check all items against shipping list. Immediately notify

the nearest Carrier Air Conditioning office if any item is
missing.

To prevent loss or damage, leave all parts in original pack-

ages until installation.

Step 2 — Provide Unit Support

ROOF CURB — Install accessory roof curb in accordance
with instructions shipped with curb. See Fig. 10. Install in-
sulation, cant strips, roofing, and flashing. Ductwork must
be attached to curb.

IMPORTANT: The gasketing of the unit to the roof
curb is critical for a watertight seal. Install gasketing
material supplied with the roof curb. Improperly ap-
plied gasketing also can result in air leaks and poor
unit performance.

Curb should be level to within

1

4

inch. 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.
The slab should extend approximately 2 in. beyond the cas-
ing on all 4 sides of the unit. Install a 6-in. gravel apron in
front of condenser-air inlet to prevent obstruction of airflow
by grass or shrubs. Do not secure the unit to the slab except
when required by local codes.

Step 3 — Provide Clearances —

The required mini-

mum service clearances and clearances to combustibles are
shown in Fig. 2-9. Adequate ventilation and condenser air
must be provided.

The condenser fan pushes air through the condenser coil

and discharges it through louvers on the top cover, the deco-
rative grille, and the compressor access panel. Be sure that
the fan discharge does not recirculate to the condenser coil.
Do not locate the unit in either a corner or under an over-
head obstruction. The minimum clearance under a partial over-
hang (such as a normal house overhang) is 48 in. above the
unit top. The maximum horizontal extension of a partial over-
hang must not exceed 48 inches.

Do not restrict condenser airflow. An air restriction at
either the outdoor-air inlet or the fan discharge can be
detrimental to compressor life.

Do not place the unit where water, ice, or snow from

an overhang or roof will damage or flood the unit. Do not
install the unit on carpeting, tile, or other combustible ma-
terials. The unit may be installed on wood flooring or on
Class A, B, or C roof covering materials.

Step 4 — Rig and Place Unit —

Use spreader bars

or crate top when rigging the unit. The units must be rigged
for lifting as shown in Fig. 11 and 12. Refer to Fig. 11 and
12 for rigging weights and Tables 1 and 2 for operating weights.
Use extreme caution to prevent damage when moving the
unit. Unit must remain in an upright position during all rig-
ging and moving operations. 
The unit must be level for proper
condensate drainage; the ground-level pad or accessory roof
curb must be level before setting the unit in place. When a
field-fabricated support is used, be sure that the support is
level and that it properly supports the unit.

UNITS WITHOUT BASE RAILS — Accessory rigging brack-
ets are recommended to be used for rigging. Install brackets
as follows:

Secure screws and paint protectors solidly against unit
basepan to hold lifting brackets in position.
Never use lifting brackets when the temperature is be-
low −10 F (−23 C).
Never exceed 200 lbs per bracket of lifting force.
Never use lifting brackets for lifting other models of air
conditioning units.
Lifting point should be directly over the unit center of
gravity.

1. Position brackets as close to the corners of unit as pos-

sible. Be sure brackets are well outside of center of grav-
ity. (See Fig. 2, 4, 6, 8, and 11.)

2. Position paint protectors and foam strips between screws

and painted surface of unit. Tighten screws until they make
contact with the paint protectors.

3. Secure device or hook of sufficient strength to hole in bracket

as shown in detail ‘‘A’’ of Fig. 11.

4. If wood top is available, use it for a spreader bar to pre-

vent straps from damaging unit. If wood top is not avail-
able, use spreader bars of sufficient length.

UNITS WITH OPTIONAL BASE RAILS — Keep unit up-
right and do not drop. Use spreader bars or top crate when
rigging unit. Rollers may be used to move unit across roof.
Level unit for proper condensate disposal. See Fig. 3, 5, 7,
and 9 for additional information. Lifting holes are provided
in base rails as shown in Fig. 12. Refer to rigging instruc-
tions on unit.

13

Summary of Contents for 50SS018

Page 1: ...re left with the unit after installation SAFETY CONSIDERATIONS Installation and servicing of air conditioning equipment can be hazardous due to system pressure and electrical com ponents Only trained...

Page 2: ...030 22 1 561 20 3 516 10 0 253 036 21 2 538 19 9 506 9 9 251 042 21 3 540 19 9 506 11 3 286 LEGEND CG Center of Gravity NEC National Electrical Code COND Condenser REQ D Required MAT L Material NOTES...

Page 3: ...21 8 554 20 4 519 12 3 312 036 21 0 533 20 1 509 12 2 310 042 21 0 532 20 1 510 13 6 344 LEGEND CG Center of Gravity NEC National Electrical Code COND Condenser REQ D Required MAT L Material NOTES 1 C...

Page 4: ...de 30 762 Except for Necessary Requirements Unit Top 36 914 Side Opposite Ducts 30 762 UNIT 50SS CENTER OF GRAVITY in mm X Y Z 048 21 9 555 19 6 498 13 4 341 060 22 2 565 19 8 503 13 4 340 LEGEND CG C...

Page 5: ...30 762 Except for Necessary Requirements Unit Top 36 914 Side Opposite Ducts 30 762 UNIT 50SS CENTER OF GRAVITY in mm X Y Z 048 21 7 550 19 7 501 15 7 400 060 22 0 560 19 9 506 15 7 399 LEGEND CG Cent...

Page 6: ...ry Requirements Unit Top 36 914 Side Opposite Ducts 30 762 NOTES 1 Clearances must be maintained to prevent recirculation of air from outdoor fan discharge 2 Dimensions in are in millimeters UNIT 50SX...

Page 7: ...equirements Unit Top 36 914 Side Opposite Ducts 30 762 NOTES 1 Clearances must be maintained to prevent recirculation of air from outdoor fan discharge 2 Dimensions in are in millimeters LEGEND CG Cen...

Page 8: ...Fig 8 Dimensions Units 50SX042 060 Without Base Rail 8...

Page 9: ...Top 36 914 Side Opposite Ducts 30 762 NOTES 1 Clearances must be maintained to prevent recirculation of air from outdoor fan discharge 2 Dimensions in are in millimeters LEGEND CG Center of Gravity NE...

Page 10: ...Fig 9 Dimensions Units 50SX042 060 With Optional Base Rail 10...

Page 11: ...36 914 Side Opposite Ducts 30 762 NOTES 1 Clearances must be maintained to prevent recirculation of air from outdoor fan discharge 2 Dimensions in are in millimeters UNIT 50SX CENTER OF GRAVITY in mm...

Page 12: ...alled 2 Seal strip must be applied as required for unit being installed 3 Dimensions in are in millimeters 4 Roof curb is made of 16 gage steel 5 Attach ductwork to curb flanges of duct rest on curb 6...

Page 13: ...in above the unit top The maximum horizontal extension of a partial over hang must not exceed 48 inches Do not restrict condenser airflow An air restriction at either the outdoor air inlet or the fan...

Page 14: ...412 341 8 867 NOTICE TO RIGGERS Hook rigging shackles through holes in lifting brackets as shown in Detail A lifting brackets to be centered around the unit center of gravity Use wood top skid when ri...

Page 15: ...20x20 20x20 20x24 20x24 24x24 24x30 24x30 Recommended field supplied filters are 1 in thick Table 2 Physical Data Unit 50SX UNIT 50SX 024 030 036 042 048 060 REFRIGERANT R 22 Metering Device Acutrol S...

Page 16: ...listed in Table 3 Heater limit switches may trip at air quan tities below those recommended Insulate and weatherproof all external ductwork Insulate and cover with a vapor barrier all ductwork passing...

Page 17: ...l opening be secured to the basepan with aluminum tape to prevent the insulation from tearing or bunching up when the blower housing is installed in the vertical discharge position 12 Orient blower ho...

Page 18: ...er Fig 16 4 Using a straight edge and sharp knife cut and remove the insulation around the perimeter of the cover Re move the screws securing the cover to the basepan and slide out the cover Discard t...

Page 19: ...ceway on top of unit until blower housing is installed 13 Orient blower housing for vertical airflow blower mo tor adjacent to horizontal duct opening See Fig 25 Reconnect the plug assemblies Slide bl...

Page 20: ...apron in ground level installations Install a field supplied conden sate trap at end of condensate connection to ensure proper drainage Make sure that the outlet of the trap is at least 1 in lower tha...

Page 21: ...for electrical data The field supplied disconnect may be mounted on the unit over the high voltage inlet hole See Fig 2 9 If the unit has an electric heater a second disconnect may be required Consult...

Page 22: ...0 1 1 3 2 16 8 25 12 100 LEGEND AWG American Wire Gage BRKR Breaker CUL Canadian Underwriters Laboratories FLA Full Load Amps HACR Heating Air Conditioning and Refrigeration LRA Locked Rotor Amps MCA...

Page 23: ...vercurrent Protection NEC National Electrical Code RLA Rated Load Amps Fuse or HACR Breaker Carrier Scroll Compressor Copeland Scroll Compressor NOTES 1 In compliance with NEC requirements for multimo...

Page 24: ...move the wirenut from the terminal on the end of the red transformer primary lead 3 Save the wirenut 4 Connect the red lead to the contactor terminal from which the orange lead was disconnected 5 Usin...

Page 25: ...n On PL Plug TRAN Transformer Field Splice Terminal Marked Fig 33 Units 50SX048 060 208 230 1 60 Integrated Control Motor Wiring Schematic Fig 32 Easy Select Interface Board LEGEND Terminal Unmarked T...

Page 26: ...follow instructions on all WARNING CAU TION and INFORMATION labels attached to or shipped with unit Make the following inspections a Inspect for shipping and handling damages such as bro ken lines loo...

Page 27: ...an automatic changeover room thermostat place both SYSTEM and FAN switches in AUTO posi tions Observe that unit operates in Cooling mode when temperature control is set to call for cooling below room...

Page 28: ...2 8 8 9 5 10 2 13 6 17 0 20 1 23 1 23 9 24 1 25 4 26 1 85 SPH 6 1 6 2 6 5 6 6 10 0 13 5 17 3 21 1 22 6 24 1 25 6 27 1 90 SPH 5 0 8 1 11 4 15 2 19 0 20 5 22 0 23 5 25 0 95 SPH 6 2 9 4 13 2 17 0 18 5 2...

Page 29: ...74 76 65 SPH 8 4 8 4 8 4 8 4 12 5 16 7 18 7 20 7 22 0 23 4 24 8 26 1 70 SPH 5 0 5 0 5 0 5 0 9 0 13 1 15 9 18 6 20 0 21 3 22 7 24 0 75 SPH 5 4 9 6 13 1 16 6 17 9 19 3 20 6 22 0 80 SPH 6 0 10 3 14 5 15...

Page 30: ...8 6 70 SPH 15 4 15 4 15 4 15 4 18 1 20 8 22 5 24 1 25 1 26 1 27 1 28 1 75 SPH 11 9 11 9 11 9 11 9 14 6 17 2 18 9 20 6 22 3 24 0 25 8 27 5 80 SPH 8 4 8 4 8 4 8 4 11 0 13 7 15 4 17 0 19 5 22 0 24 5 27 0...

Page 31: ...7 5 28 3 29 1 30 0 30 0 30 0 75 SPH 15 0 15 4 15 7 16 1 19 2 22 3 25 4 26 7 28 1 29 4 28 7 28 0 80 SPH 9 2 9 5 9 7 9 9 14 4 18 9 23 3 24 7 26 0 27 3 27 4 27 4 85 SPH 9 6 15 5 21 3 22 6 24 0 25 3 26 1...

Page 32: ...6 21 3 21 5 21 7 21 8 21 8 21 8 85 SPH 12 7 12 7 12 7 12 7 15 6 18 4 21 3 21 3 21 3 21 3 21 3 21 3 90 SPH 9 2 9 2 9 2 9 2 12 0 14 9 17 8 18 7 19 7 20 8 20 8 20 8 95 SPH 5 6 5 6 5 6 5 6 8 5 11 3 14 2 1...

Page 33: ...ng Wet Bulb SPH Superheat at Compressor F Do not attempt to charge system under these conditions refrigerant slugging may occur Table 7 Required Suction Tube Temperature F SUPERHEAT TEMP F SUCTION PRE...

Page 34: ...UX HEAT RANGE VIO NOTE If no heater is installed this step can be omitted The airflow for electric heat is selected with theAUX HEAT RANGE terminals Refer to Table 3 and the installation in structions...

Page 35: ...ers are staged then the thermostat closes a second set of contacts W2 when second stage is required When thermo stat is satisfied contacts open deenergizing the heater relay and the IFR SEQUENCE OF OP...

Page 36: ...95 550 520 500 470 425 Cfm 1540 1440 1325 1220 1110 1000 800 042 Low Watts 730 700 680 645 615 580 535 490 430 Cfm 1620 1590 1550 1510 1460 1390 1310 1210 1050 High Watts 850 800 750 700 650 610 Cfm 1...

Page 37: ...750 Cfm 2480 2370 2250 2120 2000 1850 1690 Table 10 Dry Coil Air Delivery Horizontal Discharge Deduct 10 for 208 V Unit 50SX UNIT 50SX MOTOR SPEED AIR DELIVERY 230 AND 460 VOLT HORIZONTAL DISCHARGE Ex...

Page 38: ...0 High Watts 1050 1000 930 870 810 740 665 Cfm 2000 1940 1850 1750 1635 1500 1300 Air delivery values are based on operating voltage of 230 v or 460 v dry coil without filter or electric heater Deduct...

Page 39: ...0 1200 1400 1600 1800 2000 2200 5 20 0 030 0 033 0 037 0 042 0 047 0 052 0 060 0 067 0 075 Table 15 Filter Pressure Drop in wg UNIT SIZE 50SS FILTER SIZE in CFM 500 600 700 800 900 1000 1100 1200 1300...

Page 40: ...emoval of the unit top be sure to perform all of the routine maintenance procedures that re quire top removal including coil inspection and cleaning and condensate drain pan inspection and cleaning On...

Page 41: ...moved loosen the setscrew and slide the fan off the motor shaft 4 When replacing fan blade position blade so that lead ing edge is 2 in back from condenser inlet grille or 1 2 in maximum from fan deck...

Page 42: ...ficient line voltage Determine cause and correct Blocked condenser Determine cause and correct Defective run start capacitor overload or start relay Determine cause and replace Defective thermostat Re...

Page 43: ...Motor programmed with a delay profile Allow a few minutes for motor to shut off With thermostat in OFF the voltage on G Y1 Y Y2 W with respect to common should be less than 1 2 of actual low voltage...

Page 44: ......

Page 45: ......

Page 46: ...rograms include a video cassette and or slides and a companion booklet Use these for self teaching or to conduct full training sessions For a free Service Training Material Catalog STM call 1 800 962...

Page 47: ......

Page 48: ...OR LOCATION IN HOUSING ORIFICE AND SETSCREW TIGHTNESS III START UP ELECTRICAL SUPPLY VOLTAGE L1 L2 L2 L3 L3 L1 COMPRESSOR AMPS L1 L2 L3 INDOOR FAN AMPS TEMPERATURES OUTDOOR AIR TEMPERATURE DB RETURN A...

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