Carrier CAS181 Series Installation, Start-Up And Service Instructions Manual
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Carrier CAS181 Series Installation, Start-Up And Service Instructions Manual

Carrier CAS181 Series Installation, Start-Up And Service Instructions Manual

Air-cooled condensing units with r-410a refrigerant
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Installation, Start-Up and Service Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . 1
INSTALLATION GUIDELINES . . . . . . . . . . . . . . 2
R-22 to R-410A Refrigerant . . . . . . . . . . . . . . 2
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . 2
Identify Factory Options . . . . . . . . . . . . . . . . . . 3
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 1 - Plan for Unit Location . . . . . . . . . . . . 8
Step 4 - Rig and Mount the Unit . . . . . . . . . . . 8
Suction Riser . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Connections . . . . . . . . . . . . . . . . . . . . . . . . . 12
Step 7 - Install Accessories . . . . . . . . . . . . . . 16
Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . 22
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Turn On Crankcase Heater . . . . . . . . . . . . . . . 22
Preliminary Charge . . . . . . . . . . . . . . . . . . . . . . 22
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Preliminary Checks . . . . . . . . . . . . . . . . . . . . . 23
Start Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
OPERATING SEQUENCE . . . . . . . . . . . . . . . . . 29
Base Unit Controls . . . . . . . . . . . . . . . . . . . . . . 29
All Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . 30
Quarterly Inspection
(and 30 days after initial start) . . . . . . . . . . . 30
Seasonal Maintenance . . . . . . . . . . . . . . . . . . . 30
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Refrigeration System . . . . . . . . . . . . . . . . . . . . 31
Comfort Alert Diagnostic Module . . . . . . . . . . 31
Compressor Protection . . . . . . . . . . . . . . . . . . 38
(RTPF) Coils . . . . . . . . . . . . . . . . . . . . . . . . . 38
Fastener Torque Values . . . . . . . . . . . . . . . . . . 39
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . 39
APPENDIX A - AIR CONDITIONER AND HEAT
PUMP WITH R-410A - QUICK REFERENCE
GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
START-UP CHECKLIST . . . . . . . . . . . . . . . . . CL-1
CAS181-303
Air-Cooled Condensing Units
with R-410A Refrigerant
Page
CAS-181-303-01SI

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
shock or other conditions which may cause personal injury
or property damage. Consult a qualified installer, service
agency, or your distributor or branch for information or
assistance. The qualified installer or agency must use
factory-authorized kits or accessories when modifying this
product. Refer to the individual instructions packaged with
the kits or accessories when installing.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloths for brazing operations and
have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes and appropriate
national electrical codes (in U.S.A., ANSI/NFPA70, National
Electrical Code (NEC); in Canada, CSA C22.1) for special
requirements.
It is important to recognize safety information. This is the
safety-alert symbol
. When you see this symbol on the
unit and in instructions or manuals, be alert to the potential
for personal injury.
Understand the signal words DANGER, WARNING,
CAUTION, and NOTE. These words are used with the
safety-alert symbol. DANGER identifies the most serious
hazards which will result in severe personal injury or death.
WARNING signifies hazards which could result in personal
injury or death. CAUTION is used to identify unsafe
practices, which may result in minor personal injury or
product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation,
reliability, or operation.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning will result in personal injury
or death.
Before performing service or maintenance operations
on unit, turn off main power switch to unit and install
lock(s) and lockout tag(s). Ensure electrical service to
rooftop unit agrees with voltage and amperage listed on
the unit rating plate. Unit may have more than one
power switch.
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal
injury, death and/or equipment damage.
R-410A refrigerant systems operate at higher pressures
than standard R-22 systems. Do not use R-22 service
equipment or components on R-410A refrigerant
equipment.
DANGER
2-23

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  • Page 1: Table Of Contents

    CAS181-303 Air-Cooled Condensing Units with R-410A Refrigerant Installation, Start-Up and Service Instructions CONTENTS SAFETY CONSIDERATIONS Page Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical SAFETY CONSIDERATIONS ....1 shock or other conditions which may cause personal injury INSTALLATION GUIDELINES .

  • Page 2: Installation Guidelines

    with R-410A than with R-22 (at 5°F pressure drop). A 1-1/8 inch OD suction line is rated at 53% higher tons with WARNING R-410A than with R-22 (at 2°F pressure drop). Refrigeration lines selected for R-22 use are typically oversized for PERSONAL INJURY AND ENVIRONMENTAL R-410A applications.

  • Page 3: Identify Factory Options

    Identify Factory Options single-circuit evaporator coil. Model CAS183/243/303*T/U CANNOT be field-converted to a Factory options will affect CAS unit pipe sizing selections. single-circuit design. See Table 3. Coil type impacts liquid lift limits; Check this unit’s Model Table 3 — Evaporator Coil Connections Number against the Model Number Nomenclature, Fig.
  • Page 4 MODEL SERIES Position Number C = R-410A Condensing Unit A = Air Conditioning (Cooling Only) Type S = Standard ASHRAE 90.1-2016 Efficiency 181 = 180,000 BTUH = 15 Tons (1 circuit) 183 = 180,000 BTUH = 15 Tons (2 circuit) 241 = 240,000 BTUH = 20 Tons (1 circuit) 243 = 240,000 BTUH = 20 Tons (2 circuit) Nominal...
  • Page 5 NOTE: Dimensions and drawings for size 180 also apply to 181/183 and those for refrigerant option D also apply to option T. Fig. 2 — CAS181/183 Base Unit Dimensions...
  • Page 6 NOTE: Dimensions and drawings for size 240 also apply to 241/243 and those for refrigerant option D also apply to option T. Fig. 3 — CAS241*A/B / CAS243/303*T/U Base Unit Dimensions...
  • Page 7 Table 4 — CAS181/241*A/B Physical Data UNIT CAS181*A/B CAS241*A/B NOMINAL CAPACITY (TONS) OPERATING WEIGHT (lb) REFRIGERATION SYSTEM No. Circuits / No. Comp. / Type 1 / 2 / Scroll 1 / 2 / Scroll Refrigerant Type R-410A R-410A R-410A Shipping Charge A/B (lb) System Charge w/ Fan Coil 43.0 38.0...

  • Page 8: Installation

    INSTALLATION UN-CRATE UNIT Remove unit packaging except for the top skid assembly, Jobsite Survey which should be left in place until after the unit is rigged into Complete the following checks before installation. its final location. 1. Consult local building codes and the NEC (National Elec- INSPECT SHIPMENT trical Code) ANSI/NFPA 70 for special installation requirements.

  • Page 9: Step 5 - Determine Refrigerant Line Sizes

    Step 5 — Determine Refrigerant Line Sizes NOTE: Equivalent line lengths will vary based on tube diam- eter. Calculate equivalent line length for each pipe by add- Select the recommended line sizes for CAS181/241*A/B ing equivalent length adjustments to linear lengths for each and CAS183/243/303*T/U unit from the appropriate tables.
  • Page 10 Table 7 — CAS181/241*A/B Piping Recommendations (Single-Circuit) LINEAR LINE (FT) 0-24 25-49 50-74 75-99 100-124 125-149 150-174 175-200 MODEL AND NOMINAL CAPACITY EQUIV. LINE (FT) 0-37 38-74 75-112 113-149 150-187 188-224 225-262 263-300 Liquid Line Size (in.) Liquid PD (F) Max Lift (ft) Max Lift PD (F) 5.65...
  • Page 11 Table 8 — CAS183/243/303*T/U Piping Recommendations (Dual-Circuit) LINEAR LINE (FT) 0-24 25-49 50-74 75-99 100-124 125-149 150-174 175-200 MODEL AND NOMINAL CAPACITY EQUIV. LINE (FT) 0-37 38-74 75-112 113-149 150-187 188-224 225-262 263-300 Liquid Line Size (in.) Liquid PD (F) 10.3 Max Lift (ft) CAS183*T/U...

  • Page 12: Suction Riser

    Suction Riser A suction riser condition exists when the outdoor unit is lo- cated above the indoor (evaporator) unit and suction vapor must flow vertically up to return to the compressor. Oil return is a concern when the suction tube size is too large to pro- duce the minimum refrigerant velocity to ensure oil return at minimum load conditions.
  • Page 13 Vertical Installation Liquid Line Connection Suction-Vapor Circuit 2 Connection Connections Coil Segment 1 Condensate Drain Circuit 1 Connection Connections Coil Segment 2 First On/Last Off = 2 Fig. 7 — CAS183/243/303*T/U Service Valve Locations Horizontal Installation When a single piece evaporator coil with two separate cir- cuits is connected to a CAS183/243/303*T/U, the lower coil circuit should be connected to the CAS183/243/303*T/U unit’s Circuit 1 so that the evaporator’s lower coil segment is...
  • Page 14 Table 12 — Refrigerant Specialties Part Numbers LIQUID LINE LIQUID LINE FILTER MODEL SIZES LLSV COIL SIGHT GLASS SIZE (in.) SOLENOID VALVE (LLSV) DRIER 1179872 1179874 1179877 CAS****T/U 183/243/303 Provided with unit, 1179873 1179874 1179878 see Table 11 CAS****A/B 181/241 1179873 1179874 1179878...
  • Page 15 This form of system capacity staging control is not possi- ble with CAS models. If this installation is a retrofit for a unit that included automatic pressure-operated unload- ing, check the existing thermostat and liquid solenoid valve. When found, convert the evaporator second stage Field Service solenoid control into a drop-solenoid control.

  • Page 16: Step 7 - Install Accessories

    PRELIMINARY CHARGE NOTE: Check all factory and field electrical connections for tightness. Field-supplied wiring shall conform with the limita- Before starting the unit, charge R-410A liquid refrigerant into tions of 63°F (33°C) rise. the high side of each CAS circuit through the liquid service valve(s).
  • Page 17 ALL UNITS Two types of convenience outlets are offered on CAS mod- els: Non-powered and unit-powered. Both types provide a All field wiring must comply with NEC and all local codes. 125-volt GFCI (ground-fault circuit-interrupter) duplex re- Size wire based on MCA (Minimum Circuit Amps) on the ceptacle rated at 15-A behind a hinged waterproof access unit informative plate.
  • Page 18 The weatherproof cover kit is shipped in the unit’s control box. The kit includes the hinged cover, a backing plate and gasket. DISCONNECT ALL POWER TO UNIT AND CONVE- NIENCE OUTLET. Remove the blank cover plate at the convenience outlet; discard the blank cover.
  • Page 19 THERMOSTAT Install a field-installed accessory thermostat according to installation instructions included with the accessory. For typical thermostat connections see Fig. 17 (CAS181/241 *A/B) and 18 (CAS183/243/303*T/U). Locate the field- installed thermostat accessory on a solid wall in the con- ditioned space to sense average temperature in accor- dance with the thermostat installation instructions.
  • Page 20 CONTROL CIRCUIT WIRING EXTERNAL DEVICES Control voltage is 24 v. See Fig. 13 and the unit’s label dia- The CAS control transformers provide 24-v NEC Class 2 gram for field-supplied wiring details. Route control wires power sources to energize external control devices. These through the opening in unit’s end panel to the connection in devices will include the indoor fan motor contactor (or con- the unit’s control box.
  • Page 21 Table 13 — CAS181/241*A/B Unit Wire/Fuse Sizing Data NOMINAL COMPRESSOR NO C.O. OR PWRD C.O. VOLTAGE POWER RANGE UNIT NUMBER No. 1 No. 2 Power Supply Disconnect Size SUPPLY SIZE Fuse or STAGES V-Ph-Hz HACR (ea) Breaker 208/230 25.0 25.0 60.8/60.8 80/80 63/63...

  • Page 22: Step 9 - Wind Baffles For Low Ambient

    Legend and Notes for Tables 13-14 PRE-START-UP LEGEND IMPORTANT: Before beginning Pre-Start-Up or Start-Up, — Full Load Amps review Start-Up Checklist at the back of this book. The — Locked Rotor Amps Checklist assures proper start-up of a unit and provides a MOCP —...

  • Page 23: Start-Up

    START-UP which stops compression. Suction and discharge pres- sures balance while the motor continues to run. The lon- The compressor crankcase heater must be on for 24 hours ger the compressor runs unloaded, the longer it must before start-up. After the heater has been on for 24 hours, cool before the bi-metal disk resets.
  • Page 24 your local representative. Make sure that all condenser fans check the oil level. Oil level should be 1/3 to 1/2 up on the are operating before adjusting charge to the charging sight glass (see Fig. 22). charts. Vary refrigerant until the conditions of the chart are met.
  • Page 25 20 Ton Charging Chart R-410A Refrigerant Add Charge if Above the Curve Remove Charge if Below the Curve 1050 1400 1750 2100 2450 2800 3150 3500 3850 Pressure at Liquid Valve (PSIG / kPa) 38AU500733 Fig. 24 — CAS241*A/B Charging Chart CAS-181-303-01SI Specifications subject to change without notice.
  • Page 26 15 Tons Circuit A R-410A CHARGING CHART 15 Tons Circuit B R-410A CHARGING CHART 59.9 59.9 48.8 48.8 Add Charge if Above the Curve Add Charge if Above the Curve 37.7 37.7 26.6 26.6 15.5 15.5 Remove Charge if Below the Curve Remove Charge if Below the Curve –6.7 –6.7...
  • Page 27 20 Ton Circuit A Charging Chart R-410A Refrigerant 20 Ton Circuit B Charging Chart R-410A Refrigerant Add Charge if Add Charge if Above the Curve Above the Curve Remove Charge if Remove Charge if Below the Curve Below the Curve 100 150 200 250 300 350 400 450 500 550 600 100 150 200 250 300 350 400 450 500 550 600 350 700 1050 1400 1750 2100 2450 2800 3150 3500 3850...
  • Page 28 25 Tons Circuit A R-410A CHARGING CHART 25 Tons Circuit B R-410A CHARGING CHART 59.9 59.9 48.8 48.8 Add Charge if Above the Curve Add Charge if Above the Curve 37.7 37.7 26.6 26.6 15.5 15.5 Remove Charge if Below the Curve Remove Charge if Below the Curve -6.7 -6.7...

  • Page 29: Operating Sequence

    OPERATING SEQUENCE anti-recycle time delay period has not expired, CADM2 re- lay will remain open, de-energizing Solenoid Valve Relay 2 Base Unit Controls (SVR2) and preventing compressor start. When safety pressure switches are closed and CADM2 time delay ex- INDOOR (SUPPLY) FAN pires, CADM2 relay closes, SVR2 and compressor contac- If the thermostat fan operation is selected as Continuous tor C2 are energized;...

  • Page 30: Maintenance

    MAINTENANCE Table 16 — Outdoor Unit Maintenance Checklist These items should be part of a routine maintenance pro- RECOMMENDED MAINTENANCE CHECKLIST gram, to be checked every month or two, until a specific INTERVAL schedule for each can be identified for this installation: Outdoor unit specific: Monthly Annual...

  • Page 31: Service

    SERVICE with desiccant made from 100% molecular sieve grade XH-11. Filter drier must be replaced whenever the refrig- Refrigeration System erant system is opened. When removing a filter drier, use a tubing cutter to cut the drier from the system. Do not unsweat a filter drier from the WARNING system.
  • Page 32 The POWER LED indicates the presence of control power Table 18 — Comfort Alert Diagnostic Module Inputs to the CADM. INPUT TERMINAL VOLTAGE The ALERT LED indicates an abnormal condition exists in Control Power 24-v the system through a flash code. The ALERT LED will blink Demand 24-v a number of times consecutively, pause and the repeat the...
  • Page 33 Fig. 30 — CAS183*T/U Piping Suction Equalizer Oil Equalizer Line Fig. 31 — CAS181*A/B Compressor Assembly (Rear View) CAS-181-303-01SI Specifications subject to change without notice.
  • Page 34 Fig. 32 — CAS183*T/U Compressor Assembly (Rear View) Condenser Fans/Motors Outdoor Outdoor Fan 1 Fan 4 Outdoor Fan 2 Outdoor Fan 3 Access Panel - Control Box & Compressors Service Valves Fig. 33 — CAS241/243/303 Cabinet CAS-181-303-01SI Specifications subject to change without notice.
  • Page 35 Fig. 34 — CAS243*T/U Piping Fig. 35 — CAS241*A/B Compressor Assembly (Rear View) CAS-181-303-01SI Specifications subject to change without notice.
  • Page 36 Fig. 36 — CAS243*T/U Compressor Assembly (Rear View) CAS-181-303-01SI Specifications subject to change without notice.
  • Page 37 TROUBLESHOOTING THE CADM WIRING Flashing LEDs also indicate wiring problems to the CADM. See Tables 19 and 20 for discussion of additional LED flash codes and troubleshooting instructions. Table 19 — LED Status Codes STATUS LED STATUS LED STATUS LED TROUBLESHOOTING INFORMATION DESCRIPTION Green “POWER”...

  • Page 38: Compressor Protection

    Table 20 — CADM Troubleshooting MISWIRED MODULE INDICATION RECOMMENDED TROUBLESHOOTING ACTION Determine if both R and C module terminals are connected. Verify voltage in present at module’s R and C terminals. Green LED is not on, NOTE: The CADM requires a constant nominal 24VAC power supply. The wiring to the module’s R and C module does not power up terminals must be directly from the control transformer.

  • Page 39: Fastener Torque Values

    surrounding components such as electrical wiring, painted can be easily bent over and damage to the coating of metal surfaces, or insulation. Use of non-recommended coil a protected coil) if the tool is applied across the fins. cleaners is strongly discouraged since coil and unit durabili- NOTE: Use of a water stream, such as a garden hose, ty could be affected.
  • Page 40 Table 22 — Troubleshooting PROBLEM SOLUTION COMPRESSOR DOES NOT RUN Contactor Open 1. Power off. 1. Restore power. 2. Fuses blown in field power circuit. 2. After finding cause and correcting, replace with correct size fuse. 3. No control power. 3.

  • Page 41: Guide

    Table 22 — Troubleshooting (cont) PROBLEM SOLUTION UNIT OPERATES TOO LONG OR CONTINUOUSLY 1. Low refrigerant charge. 1. Add refrigerant. 2. Control contacts fused. 2. Replace control. 3. Air in system. 3. Purge and evacuate system. 4. Partially plugged expansion valve or filter drier. 4.

  • Page 42: Appendix B - Wiring Diagrams

    APPENDIX B — WIRING DIAGRAMS ELECTRICAL UNIT DIAGRAM NUMBER PAGE NUMBER CHARACTERISTICS 208/230-3-60 38AU501341 CAS183*T/U 460-3-60 38AU501340 575-3-60 38AU501342 208/230-3-60 38AU501337 CAS243*T/U 460-3-60 38AU501336 575-3-60 38AU501338 208/230-3-60 38AU501345 CAS303*T/U 460-3-60 38AU501344 575-3-60 38AU501346 208/230-3-60 38AU500537 CAS181*A/B 460-3-60 38AU500538 575-3-60 38AU500539 208/230-3-60 38AU500568 CAS241*A/B...
  • Page 43 APPENDIX B — WIRING DIAGRAMS (CONT) Fig. A — Dual Circuit/Three Stage Wiring Diagram, 15 Ton — 208/230-3-60 Unit CAS-181-303-01SI Specifications subject to change without notice.
  • Page 44 APPENDIX B — WIRING DIAGRAMS (CONT) Fig. B — Dual Circuit/Three Stage Wiring Diagram, 15 Ton — 460-3-60 Unit CAS-181-303-01SI Specifications subject to change without notice.
  • Page 45 APPENDIX B — WIRING DIAGRAMS (CONT) Fig. C — Dual Circuit/Three Stage Wiring Diagram, 15 Ton — 575-3-60 Unit CAS-181-303-01SI Specifications subject to change without notice.
  • Page 46 APPENDIX B — WIRING DIAGRAMS (CONT) Fig. D — Dual Circuit/Three Stage Wiring Diagram, 20 Ton — 208/230-3-60 Unit CAS-181-303-01SI Specifications subject to change without notice.
  • Page 47 APPENDIX B — WIRING DIAGRAMS (CONT) Fig. E — Dual Circuit/Three Stage Wiring Diagram, 20 Ton — 460-3-60 Unit CAS-181-303-01SI Specifications subject to change without notice.
  • Page 48 APPENDIX B — WIRING DIAGRAMS (CONT) Fig. F — Dual Circuit/Three Stage Wiring Diagram, 20 Ton — 575-3-60 Unit CAS-181-303-01SI Specifications subject to change without notice.
  • Page 49 APPENDIX B — WIRING DIAGRAMS (CONT) Fig. G — Dual Circuit/Three Stage Wiring Diagram, 25 Ton — 208/230-3-60 Unit CAS-181-303-01SI Specifications subject to change without notice.
  • Page 50 APPENDIX B — WIRING DIAGRAMS (CONT) Fig. H — Dual Circuit/Three Stage Wiring Diagram, 25 Ton — 460-3-60 Unit CAS-181-303-01SI Specifications subject to change without notice.
  • Page 51 APPENDIX B — WIRING DIAGRAMS (CONT) Fig. I — Dual Circuit/Three Stage Wiring Diagram, 25 Ton — 575-3-60 Unit CAS-181-303-01SI Specifications subject to change without notice.
  • Page 52 APPENDIX B — WIRING DIAGRAMS (CONT) Fig. J — Single Circuit/Two Stage Wiring Diagram, 15 Ton — 208/230-3-60 Unit CAS-181-303-01SI Specifications subject to change without notice.
  • Page 53 APPENDIX B — WIRING DIAGRAMS (CONT) Fig. K — Single Circuit/Two Stage Wiring Diagram, 15 Ton — 460-3-60 Unit CAS-181-303-01SI Specifications subject to change without notice.
  • Page 54 APPENDIX B — WIRING DIAGRAMS (CONT) Fig. L — Single Circuit/Two Stage Wiring Diagram, 15 Ton — 575-3-60 Unit CAS-181-303-01SI Specifications subject to change without notice.
  • Page 55 APPENDIX B — WIRING DIAGRAMS (CONT) Fig. M — Single Circuit/Two Stage Wiring Diagram, 20 Ton — 208/230-3-60 Unit CAS-181-303-01SI Specifications subject to change without notice.
  • Page 56 APPENDIX B — WIRING DIAGRAMS (CONT) Fig. N — Single Circuit/Two Stage Wiring Diagram, 20 Ton — 460-3-60 Unit CAS-181-303-01SI Specifications subject to change without notice.
  • Page 57 APPENDIX B — WIRING DIAGRAMS (CONT) Fig. O — Single Circuit/Two Stage Wiring Diagram, 20 Ton — 575-3-60 Unit CAS-181-303-01SI Specifications subject to change without notice.

  • Page 58: Appendix C - Low Ambient Option

    APPENDIX C — LOW AMBIENT OPTION Troubleshooting Units with the factory installed low ambient option are equipped with a solid-state head pressure control which regulates fan speed. A temperature sensor, mounted on ei- OBSERVATION POSSIBLE REMEDY ther circuit 1 (CAS181/241*A/B units) or both circuits 1 and All fans: 2 (CAS183/243/303*T/U units) of the outdoor coil controls Check power and wiring...
  • Page 59 APPENDIX C — LOW AMBIENT OPTION (CONT) Low Ambient Sensor 2 Must Be Positioned On Vapor Stub Low Ambient Sensor 1 Must Be Positioned On Vapor Stub Circuit 2 Circuit 1 Fig. P — CAS183*T/U Low Ambient Sensor Locations Low Ambient Sensor 2 Must Be Positioned On Vapor Stub (Fourth From Top)
  • Page 60 APPENDIX C — LOW AMBIENT OPTION (CONT) Low Ambient Sensor Must Be Positioned On Vapor Stub Fig. R — CAS181/241*A/B Low Ambient Sensor Location Table A — Wind Baffle Dimension DIMENSIONS (in.) UNIT BAFFLE LEFT SIDE 10-3/4 11-1/2 12-1/4 43-1/8 4-1/4 13-1/4 22-1/4...
  • Page 61 APPENDIX C — LOW AMBIENT OPTION (CONT) NOTE: Dimensions are in inches. Fig. S — Wind Baffles – Fabrication...
  • Page 62 APPENDIX C — LOW AMBIENT OPTION (CONT) NOTE: Dimensions are in inches. Fig. T — 15 Ton Wind Baffle Brackets – Fabrication...
  • Page 63 APPENDIX C — LOW AMBIENT OPTION (CONT) TOP BRACKETS FRONT BOTTOM BRACKET BACK LEFT RIGHT Fig. U — Wind Baffle Installation – 15 Ton Units...
  • Page 64 APPENDIX C — LOW AMBIENT OPTION (CONT) FRONT LEFT BACK RIGHT Fig. V — Wind Baffle Installation – 20 and 25 Ton Units CAS-181-303-01SI Specifications subject to change without notice.
  • Page 66 © 2023 Carrier Lewisburg, TN 37091 USA Replaces: 50101340301 CAS-181-303-01SI Specifications are subject to change without notice.

  • Page 67: Start-Up Checklist

    START-UP CHECKLIST (CAS) (REMOVE AND USE FOR JOB FILE) NOTE: To avoid injury to personnel and damage to equipment or property when completing the procedures listed in this start-up checklist, use good judgment, follow safe practices, and adhere to the safety considerations/information as outlined in preceding sections of this Installation, Start-Up, and Service document.
  • Page 68 __________ / __________ / __________ NOTES: ______________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ © 2023 Carrier Lewisburg, TN 37091 USA Replaces: 50101340301 CAS-181-303-01SI CL-2 Specifications are subject to change without notice. 2-23...

This manual is also suitable for:

Cas303 seriesCas183 seriesCas241 seriesCas243 series

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