Page 1: Table Of Contents
50FC-*20-30 Single Package Rooftop Electric Cooling Unit with Puron ® (R-410A) Refrigerant 17.5-27.5 Nominal Tons Service and Maintenance Instructions CONTENTS Changing the Dirt Sensor Test ....33 Remote Station Test .
Page 2: Safety Considerations
START-UP CHECKLIST ..... CL-1 WARNING SAFETY CONSIDERATIONS UNIT OPERATION AND SAFETY HAZARD Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components.
Page 3: Unit Arrangement And Access
SEASONAL MAINTENANCE UNIT ARRANGEMENT AND ACCESS These items should be checked at the beginning of each season (or General more often if local conditions and usage patterns dictate): Figures 1 and 2 show general unit arrangement and access Air Conditioning locations.
Page 4: Supply Fan (Blower) Section
OUTSIDE AIR HOOD SUPPLY FAN (BLOWER) SECTION Outside air hood inlet screens are permanent aluminum-mesh type filters. Check these for cleanliness. Remove the screens when cleaning is required. Clean by washing with hot low-pressure wa- WARNING ter and soft detergent and replace all screens before restarting the ELECTRICAL SHOCK HAZARD unit.
Page 5 EVALUATING MOTOR SPEED NOTE: For units equipped with the Humidi-MiZer option, when replacing the UCB cut JMP 1,2 and 3 in the REHEAT/HP section The direct drive ECM blower motor uses a constant speed design. of the replacement UCB. Motor speed is controlled by a 0-10 vdc signal, where 10 vdc is equal to motor’s maximum rpm.
Page 6 ESP in. wg Factory Setting: Calculator 9.0 V 6000 Field Setting: 6500 Record field setting here 7000 7500 8000 Switch Range: 8500 9000 4.1 - 7.5 9500 10.0 6.9 - 8.7 10000 7.7 - 10.0 Field Accessories: Economizer * Overlap in A, B, C switch range designed for maximum field adjustment potential.
Page 7 ESP in. wg Calculator 1250 1348 1441 1528 1610 1688 1762 1832 1899 1963 6000 1336 1428 1515 1598 1677 1753 1824 1893 1959 2021 6500 1423 1509 1591 1670 1746 1819 1888 1955 2020 2081 7000 1510 1591 1669 1744 1817 1887...
Page 8 TROUBLESHOOTING THE ECM MOTOR EcoBlue™ motors are designed with several built-in protections included in the motor software. If the motor detects a fault it will safely shut down. See Table 4, “Supply Fan Motor Logic and Safety Relays” on page 36 for a complete list. Troubleshooting the motor requires a voltmeter.
Page 9 Removing the Motor and Fan Assembly NOTE: Due to press fit design of composite Rotor on Motor, it is highly recommended that any time a motor is replaced the fan ro- tor is replaced as well. The rest of the assembly may be reused. See Fig.
Page 10 Disassembling Standard/Medium Motor and Fan Assembly Disassembling High Static Motor and Fan Assembly See Fig. 12. See Fig. 13. NOTE: Refer to “Model Number Nomenclature” on page 66, NOTE: Refer to “Model Number Nomenclature” on page 66, position 10 for specific unit requirements. position 10 for specific unit requirements.
Page 11 Reassembly of Standard/Medium Motor and Fan Assembly Reassembly of High Static Motor and Fan Assembly See Fig. 14. See Fig. 15. NOTE: Refer to “Model Number Nomenclature” on page 66, NOTE: Refer to “Model Number Nomenclature” on page 66, position 10 for specific unit requirements. position 10 for specific unit requirements.
Page 12 Reinstalling Motor and Fan Assembly See Fig. 16. Align motor harness/grommet at ~7 o’clock (facing installer) and align the bottom flats on right and left sides of fan stator with fan deck ribs. Drop fan assembly down into fan deck opening and slide back until aluminum stator is under the rear fan deck brackets.
Page 13: Staged Air Volume
ROUTINE CLEANING OF COIL SURFACES Staged Air Volume All 50FC units with EcoBlue™ technology come factory set to Periodic cleaning with Totaline environmentally balanced coil ® automatically adjust the indoor fan motor speed in sequence with cleaner is essential to extend the life of coils. This cleaner is avail- the unit’s ventilation, cooling, and heating operation.
Page 14 Clean the outer coil surface to remove surface loaded Support (Field-Supplied) fibers or dirt. See “Remove Surface Loaded Fibers” on page 13 for details. 10. Use a water hose or other suitable equipment to flush down Top Panel between the 2 coil sections to remove dirt and debris. If a coil cleaner is used be sure to rinse the coils completely before reassembly.
Page 15: Evaporator Coil
Totaline Environmentally Balanced Coil Cleaner Application THERMOSTATIC EXPANSION VALVE (TXV) Equipment The TXV is a bi-flow, bleed port expansion valve with an external • 2-1/2 gallon garden sprayer equalizer. The TXVs are specifically designed to operate with • Water rinse with low velocity spray nozzle Puron refrigerant.
Page 16: Refrigerant System Pressure Access Ports
Refrigerant System Pressure Access Ports V I E W W I T H T X V B U L B There are two access ports in the system: on the suction tube near I N S U L A T I O N C O V E R R E M O V E D the compressor and on the discharge tube near the compressor.
Page 17: Puron ® (R-410A) Refrigerant
Amount of refrigerant charge is listed on the unit’s nameplate. Re- fer to Carrier GTAC2-5 Charging, Recovery, Recycling and Rec- Outdoor Temperature ..... . . 85°F (29°C) lamation training manual and the following procedures.
Page 18 COOLING CHARGING CHARTS 17.5 Ton Entry Tier R-410A — Charging Chart (Unit must have both compressors and outdoor fans on high speed) 59.9 Add charge if Above Curve 48.8 37.7 26.6 Remove Charge if Below the Curve 15.5 -6.7 1034 1379 1723 2068...
Page 19 COOLING CHARGING CHARTS 20 Ton Entry Tier R-410A — Charging Chart (Unit must have both compressors and outdoor fans on high speed) 59.9 Add charge if Above Curve 48.8 37.7 26.6 15.5 Remove Charge if Below the Curve -6.7 1034 1379 1723 2068...
Page 20 COOLING CHARGING CHARTS 25 Ton Entry Tier R-410A — Charging Chart (Unit must have both compressors and outdoor fans on high speed) 59.9 Add charge if Above Curve 48.8 37.7 26.6 Remove Charge if Below the Curve 15.5 -6.7 1034 1379 1723 2068...
Page 21 COOLING CHARGING CHARTS 27.5 Ton Entry Tier R-410A — Charging Chart (Unit must have both compressors and outdoor fans on high speed) 59.9 Add charge if Above Curve 48.8 37.7 26.6 15.5 Remove Charge if Below the Curve -6.7 1034 1379 1723 2068...
Page 22 COOLING CHARGING CHARTS 17.5 Ton Entry Tier Humidi-MiZer R-410A — Charging Chart (Unit must run in subcooling mode) 59.9 Add charge if Above Curve 48.8 37.7 26.6 Remove Charge if Below the Curve 15.5 -6.7 1034 1379 1723 2068 2413 2758 3102 3447...
Page 23 COOLING CHARGING CHARTS 20 Ton Entry Tier Humidi-MiZer R-410A — Charging Chart (Unit must run in subcooling mode) 59.9 Add charge if Above Curve 48.8 37.7 26.6 Remove Charge if Below the Curve 15.5 -6.7 1034 1379 1723 2068 2413 2758 3102 3447...
Page 24 COOLING CHARGING CHARTS 25 Ton Entry Tier Humidi-MiZer R-410A — Charging Chart (Unit must run in subcooling mode) 59.9 Add charge if Above Curve 48.8 37.7 26.6 Remove Charge if Below the Curve 15.5 -6.7 1034 1379 1723 2068 2413 2758 3102 3447...
Page 25 COOLING CHARGING CHARTS 27.5 Ton Entry Tier Humidi-MiZer R-410A — Charging Chart (Unit must run in subcooling mode) 59.9 Add charge if Above Curve 48.8 37.7 26.6 Remove Charge if Below the Curve 15.5 -6.7 1034 1379 1723 2068 2413 2758 3102 3447...
Page 26: Compressor
COMPRESSOR Compressor Rotation Lubrication CAUTION The compressor is charged with the correct amount of oil at the factory. EQUIPMENT DAMAGE HAZARD Failure to follow this caution can result in premature wear and damage to equipment. CAUTION Scroll compressors can only compress refrigerant if rotat- UNIT DAMAGE HAZARD ing in the right direction.
Page 27: Troubleshooting Cooling System
Troubleshooting Cooling System Refer to Table 1 for additional troubleshooting topics. Table 1 — Troubleshooting SYMPTOM CAUSE SOLUTION Power failure. Call power company. Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker. Determine root cause. Defective thermostat, contactor, transformer. Replacement component.
Page 28: Convenience Outlets
Press the gasket over the screw heads. Slip the backing CONVENIENCE OUTLETS plate over the screw heads at the keyhole slots and align with the gasket; tighten the two screws until snug (do not over-tighten). WARNING Mount the weatherproof cover to the backing plate as ELECTRICAL OPERATION HAZARD shown in Fig.
Page 29: Duty Cycle
SMOKE DETECTORS Smoke detectors are available as factory-installed options on 50FC models. Smoke detectors may be specified for supply air only, for return air without or with economizer, or in combination of supply air and return air. Return air smoke detectors are ar- ranged for vertical return configurations only.
Page 30: Smoke Detector Locations
Air is introduced to the duct smoke detector sensor’s sensing chamber through a sampling tube that extends into the HVAC duct and is directed back into the ventilation system through a (shorter) exhaust tube. The difference in air pressure between the two tubes pulls the sam- pled air through the sensing chamber.
Page 31: Fiop Smoke Detector Wiring And Response
RETURN AIR SMOKE DETECTOR SENSOR WITH ECONOMIZER The sampling tube is inserted through the side plates of the econo- mizer housing, placing it across the return air opening on the unit basepan. The holes in the sampling tube face into the return air stream.
Page 32: Sensor And Controller Tests
Fig. 41 — Typical Smoke Detector System Wiring SENSOR AND CONTROLLER TESTS Controller Alarm Test The controller alarm test checks the controller’s ability to initiate Sensor Alarm Test and indicate an alarm state. The sensor alarm test checks a sensor’s ability to signal an Controller Alarm Test Procedure alarm state.
Page 33: Dirty Sensor Test
Remote Station Test The remote station alarm test checks a test/reset station’s ability to IMPORTANT: Failure to follow this ALERT can result in initiate and indicate an alarm state. an unnecessary evacuation of the facility. Pressing the controller’s test/reset switch for longer than seven seconds will put the duct detector into the alarm state and IMPORTANT: Failure to follow this ALERT can result in activate all automatic alarm responses.
Page 34: Dirty Sensor Test Using An Sd-Trk4
Indicators IMPORTANT: Failure to follow this ALERT can result in NORMAL STATE an unnecessary evacuation of the facility. The smoke detector operates in the normal state in the absence of Holding the test magnet to the target area for longer than seven any trouble conditions and when its sensing chamber is free of seconds will put the detector into the alarm state and activate smoke.
Page 35: Troubleshooting
NOTE: All troubles are latched by the duct smoke detector. The PROTECTIVE DEVICES trouble condition must be cleared and then the duct smoke detec- Compressor Protection tor must be reset in order to restore it to the normal state. OVERCURRENT RESETTING ALARM AND TROUBLE CONDITION TRIPS The compressor has internal line-break motor protection.
Page 36: Relief Device
LOW PRESSURE SWITCH CONDENSER FAN MOTOR PROTECTION The system is protected against a loss of charge and low evapora- The condenser fan motor is internally protected against tor coil loading condition by a low pressure switch located on the over-temperature. suction line near the compressor.
Page 37: Electric Heaters
Rooftop Units, Select 17.5 to 27.5 Tons” for details on ELECTRIC HEATERS selecting the correct single point kit for the accessory heater The 50FC units can be equipped with field-installed accessory being installed. Terminal block and fuse holder can be electric heaters.
Page 38 Control Box Filter Access Blower Access Panel Panel Access Panel Electric Heater Section Access Panel Fig. 46 — Typical Unit – Access Panel Locations Post Block Off Plate Post Fig. 47 — Block-Off Plate and Post Locations...
Page 39 Heater Support Rails Grommets Opening For Heater Fig. 48 — Opening for Electric Heater Access Door Open Fig. 49 — Electric Heater Accessory In Place (Shown with Access Door Opened)
Page 40 Control Box VIEW D 460V Heater Wire VIEW C Fuse Block 4mm Allen Head Screws Blue Yellow Black Control Box Fuse Block Control Box Blue Heater Black Yellow Wires VIEW D VIEW C NOTE: Route heater wires to lugs as Shroud shown using top two holes in lugs.
Page 41 Cover 230V Heater Wiring VIEW G Control Box Main Fuse Blue Yellow Cover for Lugs Removed Heater Wiring Black VIEW H Control Box Line Side Main Fuse VIEW H VIEW G Power Wires 2 Heater Wires Per Terminal VIEW H 4 Heater Wires Per Terminal Fig.
Page 42: Completing Heater Installation
Fuse Holder Terminal Block Fig. 52 — Single Point Installation Fig. 53 — Wiring Diagram for Single Point Kit Accessory When Required Completing Heater Installation Check electrical connections Turn thermostat to OFF position. Restore power to unit. Check voltage supply and match the reading against unit and heater nameplate.
Page 43: Systemvu Control System
Through the SystemVu interface, the user can access all of the The SystemVu control system is fully communicating and cable- inputs and outputs to check on their values and status, config- ready for connection to the Carrier Comfort Network (CCN), ®...
Page 44: Economizer Systems
ECONOMIZER SYSTEMS The unit may be equipped with a factory-installed or accessory Outside Air (field-installed) economizer system. Three types are available: Temperature Sensor two with logic control systems (EconoMi$er X and EconoMi$er ® Low Ambient EconoMi$er IV Sensor IV) and one without a control system (EconoMi$er2). See Controller (W7212) Fig.
Page 45: Economi$Er2
EconoMi$er2 IMPORTANT: The optional EconoMi$er 2 does not ® include a controller. The EconoMi$er2 is operated by a 4 mA to 20 mA signal from an existing field-supplied con- troller. See Fig. 58 for wiring information. BLACK Transformer Ground BLUE 500 OHM Resistor VIOLET...
Page 46: Economi$Er Iv (Field-Installed Accessory)
EconoMi$er IV (Field-Installed Accessory) IMPORTANT: For 50FC*20-30 rooftop units EconoMi$er IV is available as a field-installed accessory only. ECONOMI$ER IV STANDARD SENSORS Troubleshooting instructions are enclosed. A functional view of the EconoMi$er ® IV accessory is shown in Fig. 59. Typical set- tings, sensor ranges, and jumper positions are also shown.
Page 47 Outdoor Air Temperature (OAT) Sensor Outdoor Air Lockout Sensor The outdoor air temperature sensor (HH57AC074) is a 10 to The EconoMi$er IV is equipped with an ambient temperature 20 mA device used to measure the outdoor-air temperature. lockout switch located in the outdoor airstream which is used The outdoor-air temperature is used to determine when the to lock out the compressors below a 42°F (6°C) ambient tem- EconoMi$er IV can be used for free cooling.
Page 48 Outdoor Enthalpy Changeover DIP Switch Changeover enthalpy control, accessory enthalpy sensor Position Temperature (P/N: HH57AC078) is required. Replace the standard outdoor dry bulb temperature sensor with the accessory enthalpy sensor 48°F in the same mounting location. See Fig. 65. When the outdoor 1 2 3 air enthalpy rises above the outdoor enthalpy changeover set point, the outdoor-air damper moves to its minimum position.
Page 49 Pressure Drop for Electric Heat, 17.5 to 27.5 Ton Units (29) (32) (35) (38) (41) (43) 0.45 CONTROL POINT CONTROL 0.40 APPROX. °F (°C) CURVE AT 50% RH (27) 0.35 73 (23) 70 (21) 0.30 67 (19) 63 (17) 0.25 (24) 0.20 0.15...
Page 50 Exhaust Set Point Adjustment Damper Movement The exhaust set point will determine when the exhaust fan runs Damper movement from full open to full closed (or vice versa) based on damper position (if accessory power exhaust is in- takes 2-1/2 minutes. stalled).
Page 51 Place 1.2 kilo-ohm resistor across SR and +. The Free Use setting 1 or 2 for Carrier equipment Cool LED should be lit. Press Clear and Mode buttons. Hold at least 5 seconds until Remove 620-ohm resistor across SO and +.
Page 52: Economi$Er X (Factory-Installed Option)
DCV MINIMUM AND MAXIMUM POSITION EconoMi$er X (Factory-Installed Option) To check the DCV minimum and maximum position: PRODUCT DESCRIPTION Make sure EconoMi$er IV preparation procedure has been The EconoMi$er ® X system is an expandable economizer control performed. system, which includes a W7220 economizer module (controller) Connect a 9-v battery to AQ (positive node) and AQ1 (neg- with an LCD and keypad (see Fig.
Page 53 SPECIFICATIONS OUTPUTS W7220 Economizer Module Actuator Signal: The module is designed for use with 2 to 10 vdc or bus communi- 2-10 vdc; minimum actuator impedance is 2k ohm; bus two-wire cating actuator. The module includes terminals for CO sensor, output for bus communicating actuators.
Page 54 Table 7 — Economizer Module — Left Hand Terminal Blocks LABEL TYPE DESCRIPTION Top Left Terminal Block 20k NTC and Mixed Air Temperature Sensor (Polarity Insensitive Connection) 20k NTC and Outdoor Air Temperature Sensor (Polarity Insensitive Connection) S-BUS S-BUS Enthalpy Control Sensor S-BUS (Sylk™...
Page 55 To use the keypad when working with Set Points, System and Ad- CO Sensor vanced Settings, Checkout tests and Alarms: Navigate to the desired menu. Press the (Enter) button to display the first item in the (Hot) Black currently displayed menu. Use the ▲...
Page 56 Table 11 — W7220 Menu Structure PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT FIRST STAGE COOLING DEMAND (Y1–IN) ECONO AVAIL YES/NO YES = economizing available; the system can use outside air for free cooling when required. FIRST STAGE COOLING RELAY OUTPUT ECONOMIZING YES/NO YES = outside air being used for 1 stage cooling...
Page 57 Table 11 — W7220 Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT MECH COOL ON Displays stage of mechanical cooling that is active. 0, 1, or 2 HEAT STAGES ON Displays the stage of heat pump heating that is active. STATUS SUPPLY FAN SPEED (cont)
Page 58 Table 11 — W7220 Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT 0°F to 50°F ENERGY RECOVERY VENTILATOR UNIT OUTDOOR AIR ERV OAT SP 32°F (–18°C to 10°C); TEMPERATURE SETPOINT increment by 1°F Only displayed when AUX1 O = ERV. Exhaust fan set point for single speed units.
Page 59 Table 11 — W7220 Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT COOLING STAGE 3 DELAY 0 min, 5 min, Delay after stage 2 cool has been active. Turns on second stage of 15 min, then cooling when economizer is first stage and mechanical cooling is STG3 DLY 2.0h...
Page 60 Table 11 — W7220 Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT DISCHARGE AIR S-BUS SENSOR ERROR DA SYLK T ERR Discharge air sensor has failed or become disconnected - check wiring then replace sensor if the alarm continues. OUTSIDE AIR TEMPERATURE SENSOR ERROR OA SENS T ERR Outdoor air temperature sensor has failed or become disconnected...
Page 61 2 SPEED FAN OPERATION The 2 speed fan delay is available when the system is programmed for 2 speed fan (in the System Setup menu item). The 2 speed fan The W7220 controller has the capability to work with a system us- delay is defaulted to 5 minutes and can be changed in the Ad- ing a 2-speed supply fan.
Page 62 ENTHALPY SETTINGS When all of the OA conditions are above the selected bound- ary, the conditions are not good to economize and the mode is When the OA temperature, enthalpy and dew point are below set to NO. the respective set points, the Outdoor Air can be used for econ- Figure 74 shows the 5 current boundaries.
Page 63: Pre-Start-Up/Start-Up
CHECKOUT TROUBLESHOOTING Inspect all wiring connections at the economizer module’s termi- Alarms nals, and verify compliance with the installation wiring diagrams. The economizer module provides alarm messages that display For checkout, review the Status of each configured parameter and on the 2-line LCD. perform the Checkout tests.
Page 64: Start-Up, General
Return-Air Filters Ensure correct filters are installed in unit (see Appendix B — WARNING Physical Data). Do not operate unit without return-air filters. ELECTRICAL OPERATION HAZARD Outdoor-Air Inlet Screens Failure to follow this warning could result in personal injury or Outdoor-air inlet screen must be in place before operating unit.
Page 65: Heating
To shut off unit, set system selector switch at OFF position. Reset- FASTENER TORQUE VALUES ting thermostat at a position above room temperature shuts unit off temporarily until space temperature exceeds thermostat setting. Table 15 — Torque Values Heating Stator Motor Mounting 50 in.-lb (5.7 Nm) + 5 in.-lb (0.6 Nm) To start unit, turn on main power supply.
Page 66: Appendix A - Model Number Nomenclature
APPENDIX A — MODEL NUMBER NOMENCLATURE Position: 9 10 11 12 13 14 15 16 17 18 Example: Unit Heat Type Packaging Compliance 50 = Cooling with Optional Electric Heat 0 = Standard Packaged Rooftop Electrical Options Model Series - WeatherMaker ®...
Page 67 APPENDIX B — PHYSICAL DATA 50FC 20 to 24 Physical Data 50FC UNIT 50FC-*M20 50FC-*N20 50FC-*M24 50FC-*N24 NOMINAL TONS 17.5 17.5 20.0 20.0 BASE UNIT OPERATING WT (lb) 1673 1673 1873 1873 REFRIGERATION SYSTEM No. Circuits / No. Compressors / Type 1 / 2 / Scroll 1 / 2 / Scroll 1 / 2 / Scroll...
Page 68: Appendix B - Physical Data
APPENDIX B — PHYSICAL DATA (cont) 50FC 28 to 30 Physical Data 50FC UNIT 50FC-*M28 50FC-*N28 50FC-*M30 50FC-*N30 NOMINAL TONS 25.0 25.0 27.5 27.5 BASE UNIT OPERATING WT (lb) 2047 2047 2224 2224 REFRIGERATION SYSTEM No. Circuits / No. Compressors / Type 1 / 2 / Scroll 1 / 2 / Scroll 1 / 2 / Scroll...
Page 69: Appendix C - Fan Performance
APPENDIX C — FAN PERFORMANCE For information on the electrical properties of the fan GENERAL FAN PERFORMANCE NOTES motors, please see the Electrical information section of the Interpolation is permissible. Do not extrapolate. product specifications book. External static pressure is the static pressure difference For more information on the performance limits of the fan between the return duct and the supply duct plus the static motors, see the application data section of the product...
Page 70 APPENDIX C — FAN PERFORMANCE (cont) 50FC-M20 — 17.5 Ton Vertical Supply (rpm - bhp) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 5250 1048 0.86 1162 1.18 1268 1.53 1366 1.91 1457 2.32 5690 1116 1.05 1220 1.37 1322 1.74 1417 2.14 1505 2.56...
Page 71 APPENDIX C — FAN PERFORMANCE (cont) 50FC-M20 – High Static — 17.5 Ton Vertical Supply (rpm - vdc) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 5250 1048 1162 1268 1366 1457 5690 1116 1220 1322 1417 1505 6125 1185 1281 1377 1469 1555 6565...
Page 72 APPENDIX C — FAN PERFORMANCE (cont) 50FC-M24 — 20 Ton Vertical Supply (rpm - bhp) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 6000 1166 1.19 1263 1.52 1361 1.90 1454 2.31 1540 2.75 6500 1246 1.45 1335 1.79 1427 2.18 1515 2.61 1598 3.06...
Page 73 APPENDIX C — FAN PERFORMANCE (cont) 50FC-M24 – High Static — 20 Ton Vertical Supply (rpm - vdc) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 6000 1166 1263 1361 1454 1540 6500 1246 1335 1427 1515 1598 7000 1329 1409 1493 1578 1658 7500...
Page 74 APPENDIX C — FAN PERFORMANCE (cont) 50FC-M28 — 25 Ton Vertical Supply (rpm - bhp) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 7500 1105 1.30 1181 1.58 1263 1.93 1351 2.37 1441 2.87 8125 1183 1.60 1252 1.90 1326 2.25 1405 2.68 1487 3.18...
Page 75 APPENDIX C — FAN PERFORMANCE (cont) 50FC-M28 – High Static — 25 Ton Vertical Supply (rpm - vdc) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 3000 1105 1181 1263 1351 1441 3250 1183 1252 1326 1405 1487 3500 1263 1326 1393 1464 1538 3750...
Page 76 APPENDIX C — FAN PERFORMANCE (cont) 50FC-M30 — 27.5 Ton Vertical Supply (rpm - bhp) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 8250 1193 1.64 1260 1.94 1332 2.29 1408 2.70 1488 3.19 8940 1281 2.04 1341 2.34 1406 2.70 1474 3.11 1546 3.59...
Page 77 APPENDIX C — FAN PERFORMANCE (cont) 50FC-M30 – High Static — 27.5 Ton Vertical Supply (rpm - vdc) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 8250 1193 1260 1332 1408 1488 8940 1281 1341 1406 1474 1546 9625 1369 1425 1483 1545 1609 10300...
Page 78 APPENDIX C — FAN PERFORMANCE (cont) 50FC-M20 — 17.5 Ton Horizontal Supply (rpm - bhp) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 5250 1190 1.01 1293 1.30 1390 1.61 1482 1.95 1569 2.32 5690 1271 1.22 1366 1.52 1458 1.85 1546 2.20 1629 2.58...
Page 79 APPENDIX C — FAN PERFORMANCE (cont) 50FC-M24 — 20 Ton Horizontal Supply (rpm - bhp) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 6000 1328 1.39 1420 1.69 1508 2.03 1592 2.39 1674 2.78 6500 1422 1.68 1508 2.00 1590 2.34 1670 2.71 1747 3.11...
Page 80 APPENDIX C — FAN PERFORMANCE (cont) 50FC-M28 — 25 Ton Horizontal Supply (rpm - bhp) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 7500 1415 2.15 1491 2.51 1568 2.92 1645 3.37 1719 3.85 8125 1519 2.65 1589 3.03 1660 3.46 1732 3.93 1801 4.42...
Page 81 APPENDIX C — FAN PERFORMANCE (cont) 50FC-M30 — 27.5 Ton Horizontal Supply (rpm - bhp) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 8250 1530 2.70 1599 3.09 1669 3.51 1739 3.97 1808 4.46 8940 1645 3.33 1709 3.74 1773 4.18 1837 4.64 1902 5.15...
Page 82: Appendix D - Wiring Diagrams
APPENDIX D — WIRING DIAGRAMS 50FC-*20-30 Standard SCCR Wiring Diagrams Size V-Ph-Hz Page Control Wiring Page Power Wiring 208/230-3-60 50HE003736 50HE003738 50FC-*20-28 with Electro-Mechanical 460-3-60 50HE003758 50HE003737 W7220 Controller 575-3-60 50HE003759 208/230-3-60 50HE003736 50HE003739 50FC-*30 with Electro- Mechanical W7220 460-3-60 50HE003760 50HE003737 Controller...
Page 83 APPENDIX D — WIRING DIAGRAMS (cont) Fig. B — Typical 50FC-*20-30 with Electro-Mechanical W7220 Controller – Standard SCCR (208/230-3-60)
Page 84 APPENDIX D — WIRING DIAGRAMS (cont) Fig. C — Typical 50FC-*20-30 with Electro-Mechanical W7220 Controller – Standard SCCR (460, 575-3-60)
Page 85 APPENDIX D — WIRING DIAGRAMS (cont) Fig. D — Typical 50FC-*20-30 with SystemVu Controller – Standard SCCR (208/230-3-60)
Page 86 APPENDIX D — WIRING DIAGRAMS (cont) Fig. E — Typical 50FC-*20-30 with SystemVu Controller – Standard SCCR (460, 575-3-60)
Page 87 APPENDIX D — WIRING DIAGRAMS (cont) Fig. F — Typical 50FC-*20-28 Power Wiring Diagram, Electro-Mechanical with W7220 – Standard SCCR (208/230-3-60)
Page 88 APPENDIX D — WIRING DIAGRAMS (cont) Fig. G — Typical 50FC-*20-28 Power Wiring Diagram, Electro-Mechanical with W7220 – Standard SCCR (460-3-60)
Page 89 APPENDIX D — WIRING DIAGRAMS (cont) Fig. H — Typical 50FC-*20-28 Power Wiring Diagram, Electro-Mechanical with W7220 – Standard SCCR (575-3-60)
Page 90 APPENDIX D — WIRING DIAGRAMS (cont) Fig. I — Typical 50FC-*30 Power Wiring Diagram, Electro-Mechanical with W7220 – Standard SCCR (208/230-3-60)
Page 91 APPENDIX D — WIRING DIAGRAMS (cont) Fig. J — Typical 50FC-*30 Power Wiring Diagram, Electro-Mechanical with W7220 – Standard SCCR (460-3-60)
Page 92 APPENDIX D — WIRING DIAGRAMS (cont) Fig. K — Typical 50FC-*30 Power Wiring Diagram, Electro-Mechanical with W7220 – Standard SCCR (575-3-60)
Page 93 APPENDIX D — WIRING DIAGRAMS (cont) Fig. L — Typical 50FC-*20-28 Power Wiring Diagram with SystemVu Controller – Standard SCCR (208/230-3-60)
Page 94 APPENDIX D — WIRING DIAGRAMS (cont) Fig. M — Typical 50FC-*20-28 Power Wiring Diagram with SystemVu Controller – Standard SCCR (460-3-60)
Page 95 APPENDIX D — WIRING DIAGRAMS (cont) Fig. N — Typical 50FC-*20-28 Power Wiring Diagram with SystemVu Controller – Standard SCCR (575-3-60)
Page 96 APPENDIX D — WIRING DIAGRAMS (cont) Fig. O — Typical 50FC-*30 Power Wiring Diagram with SystemVu Controller – Standard SCCR (208/230-3-60)
Page 97 APPENDIX D — WIRING DIAGRAMS (cont) Fig. P — Typical 50FC-*30 Power Wiring Diagram with SystemVu Controller – Standard SCCR (460-3-60)
Page 98 APPENDIX D — WIRING DIAGRAMS (cont) Fig. Q — Typical 50FC-*30 Power Wiring Diagram with SystemVu Controller – Standard SCCR (575-3-60)
Page 99 APPENDIX D — WIRING DIAGRAMS (cont) Fig. R — Typical 50FC-*20-30 with Electro-Mechanical W7220 Controller – High SCCR (208/230-3-60)
Page 100 APPENDIX D — WIRING DIAGRAMS (cont) Fig. S — Typical 50FC-*20-30 with Electro-Mechanical W7220 Controller – High SCCR (460, 460-3-60)
Page 101 APPENDIX D — WIRING DIAGRAMS (cont) Fig. T — Typical 50FC-*20-30 with SystemVu Controller – High SCCR (208/230-3-60)
Page 102 APPENDIX D — WIRING DIAGRAMS (cont) Fig. U — Typical 50FC-*20-30 with SystemVu Controller – High SCCR (460-3-60)
Page 103 APPENDIX D — WIRING DIAGRAMS (cont) Fig. V — Typical 50FC-*20-28 Power Wiring Diagram, Electro-Mechanical with W7220 – High SCCR (208/230-3-60)
Page 104 APPENDIX D — WIRING DIAGRAMS (cont) Fig. W — Typical 50FC-*20-28 Power Wiring Diagram, Electro-Mechanical with W7220 – Standard SCCR (460-3-60)
Page 105 APPENDIX D — WIRING DIAGRAMS (cont) Fig. X — Typical 50FC-*30 Power Wiring Diagram, Electro-Mechanical with W7220 – High SCCR (208/230-3-60)
Page 106 APPENDIX D — WIRING DIAGRAMS (cont) Fig. Y — Typical 50FC-*30 Power Wiring Diagram, Electro-Mechanical with W7220 – High SCCR (460-3-60)
Page 107 APPENDIX D — WIRING DIAGRAMS (cont) Fig. Z — Typical 50FC-*20-28 Power Wiring Diagram with SystemVu Controller – High SCCR (208/230-3-60)
Page 108 APPENDIX D — WIRING DIAGRAMS (cont) Fig. AA — Typical 50FC-*20-28 Power Wiring Diagram with SystemVu Controller – High SCCR (460-3-60)
Page 109 APPENDIX D — WIRING DIAGRAMS (cont) Fig. AB — Typical 50FC-*30 Power Wiring Diagram with SystemVu Controller – High SCCR (208/230-3-60)
Page 110 APPENDIX D — WIRING DIAGRAMS (cont) Fig. AC — Typical 50FC-*30 Power Wiring Diagram with SystemVu Controller – High SCCR (460-3-60)
Page 111: Appendix E - Low Ambient Control Sensor Location
APPENDIX E — LOW AMBIENT CONTROL SENSOR LOCATION T O P O F C O I L T O P O F C O I L S E N S O R P O S I T I O N S E E N O T E # 1 S E N S O R P O S I T I O N S E E N O T E # 1...
Page 114 © 2024 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500302-01 Printed in U.S.A. Form 50FC-20-30-01SM Pg 114 1-24 Replaces: NEW...
Page 115 START-UP CHECKLIST 50FC-*20-30 Single Package Rooftop Electric Cooling Unit (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 Service and Maintenance Instruction document.
Page 116 5. Turn off heating, cooling, and reheat, restore set points for thermostat and humidistat (Y/N) _____ © 2024 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500302-01 Printed in U.S.A.

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Carrier 50FC M20 Series Service And Maintenance Instructions

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