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Carrier 50KC04-06 Service And Maintenance Instructions

Single package rooftop electric cooling units with optional electric heat with refrigerant
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Service and Maintenance Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 1
UNIT ARRANGEMENT AND ACCESS. . . . . . . . . . . . . 2
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Seasonal Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . 3
SUPPLY FAN (BLOWER) SECTION . . . . . . . . . . . . . . 4
Supply Fan (Belt-Drive) . . . . . . . . . . . . . . . . . . . . . . . . 4
COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Condenser Coil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Recommendation. . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
PURON® (R-410A) REFRIGERANT. . . . . . . . . . . . . . 11
Refrigerant Charge. . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Condenser Fan Adjustment . . . . . . . . . . . . . . . . . . . 17
CONVENIENCE OUTLETS . . . . . . . . . . . . . . . . . . . . . 18
Non-Powered Type. . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Unit-Powered Type. . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Duty Cycle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Fuse on Powered Type . . . . . . . . . . . . . . . . . . . . . . . 19
SMOKE DETECTORS . . . . . . . . . . . . . . . . . . . . . . . . . 19
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Smoke Detector Locations . . . . . . . . . . . . . . . . . . . . 20
Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Sensor and Controller Tests . . . . . . . . . . . . . . . . . . . 22
PROTECTIVE DEVICES . . . . . . . . . . . . . . . . . . . . . . . 25
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . . 25
Relief Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Control Circuit, 24-v . . . . . . . . . . . . . . . . . . . . . . . . . . 25
ELECTRIC HEATERS . . . . . . . . . . . . . . . . . . . . . . . . . 25
Completing Heater Installation . . . . . . . . . . . . . . . . . 27
OPTION) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
RTU-OPEN CONTROL SYSTEM . . . . . . . . . . . . . . . . 27
ECONOMIZER SYSTEMS. . . . . . . . . . . . . . . . . . . . . . 28
EconoMi$er IV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Economi$er® X (Factory Option) . . . . . . . . . . . . . . . 38
WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500223-01
Electric Cooling Units with Optional Electric Heat
Printed in U.S.A.
Form 50KC-4-6-01SM
Single Package Rooftop
with Puron
®
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
START-UP, GENERAL . . . . . . . . . . . . . . . . . . . . . . . .52
Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Outdoor-Air Inlet Screens . . . . . . . . . . . . . . . . . . . . .52
Compressor Mounting . . . . . . . . . . . . . . . . . . . . . . . .52
Internal Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Refrigerant Service Ports. . . . . . . . . . . . . . . . . . . . . .52
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . .52
Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Ventilation (Continuous Fan). . . . . . . . . . . . . . . . . . .53
START-UP, PREMIERLINK CONTROLS . . . . . . . . . .53
START-UP, RTU-OPEN CONTROL . . . . . . . . . . . . . .53
OPERATING SEQUENCE . . . . . . . . . . . . . . . . . . . . . .53
Base Unit Controls . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Cooling - Units without Economizer . . . . . . . . . . . . .53
Heating - Units without Economizer . . . . . . . . . . . . .53
Cooling, Unit with EconoMi$er IV . . . . . . . . . . . . . . .53
Heating, Unit with EconoMi$er IV . . . . . . . . . . . . . . .53
Demand Controlled Ventilation . . . . . . . . . . . . . . . . .53
FASTENER TORQUE VALUES. . . . . . . . . . . . . . . . . .54
APPENDIX B - PHYSICAL DATA . . . . . . . . . . . . . . .57
APPENDIX C - FAN PERFORMANCE . . . . . . . . . . .59
APPENDIX D - ELECTRICAL DATA. . . . . . . . . . . . .67
APPENDIX E - WIRING DIAGRAMS. . . . . . . . . . . . .75
APPENDIX F - MOTORMASTER SENSOR
LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . .CL-1

SAFETY CONSIDERATIONS

Improper
installation,
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 USA, 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.
Pg 1
50KC04-06
(R-410A) Refrigerant
adjustment,
alteration,
2-19
Replaces: NEW
service,

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Summary of Contents for Carrier 50KC04-06

  • Page 1: Table Of Contents

    50KC04-06 Single Package Rooftop Electric Cooling Units with Optional Electric Heat with Puron ® (R-410A) Refrigerant Service and Maintenance Instructions CONTENTS PRE-START-UP ......52 START-UP, GENERAL .

  • Page 2: Unit Arrangement And Access

    Understand the signal words DANGER, WARNING, FILTER ACCESS PANEL 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.

  • Page 3: Seasonal Maintenance

    Seasonal Maintenance These items should be checked at the beginning of each season 17 1/4” (or more often if local conditions and usage patterns dictate): AIR CONDITIONING • Condenser fan motor mounting bolts tightness • Compressor mounting bolts • Condenser fan blade positioning •...

  • Page 4: Supply Fan (Blower) Section

    Install the new belt by gently sliding the belt over both SUPPLY FAN (BLOWER) SECTION pulleys and then sliding the motor and plate away from the fan housing until proper tension is achieved. Check the alignment of the pulleys, adjust if necessary. WARNING Tighten all bolts.

  • Page 5: Cooling

    This cleaner is available from Carrier Replacement Components Division as part number P902-0301 for a one gallon container, and part number P902-0305 for a 5 gallon container. It is recommended...
  • Page 6 • poor quality water for cleaning Totaline environmentally sound coil cleaner is nonflammable, hypo-allergenic, non-bacterial, and a USDA accepted biode- gradable agent that will not harm the coil or surrounding com- ponents such as electrical wiring, painted metal surfaces, or in- sulation.

  • Page 7: Evaporator Coil

    Totaline Environmentally Sound Coil Cleaner Application Evaporator Coil Instructions CLEANING THE EVAPORATOR COIL Proper eye protection such as safety glasses is recom- Turn unit power off. Install lockout tag. Remove evapora- mended during mixing and application. tor coil access panel. Remove all surface loaded fibers and dirt with a vacuum If economizer or two-position damper is installed, remove cleaner as described above.
  • Page 8 Accutrol NOTE: Each feeder tube in the liquid header has a metering device. Fig. 11 — 50KC*A,B Sizes 04-05 Metering Piping Diagram...
  • Page 9 Accurater Accutrol NOTE: Each feeder tube in the liquid header has a metering device. Fig. 12 — 50KC*A,B Sizes 06 Dual Metering Piping Diagram...

  • Page 10: Refrigerant System Pressure Access Ports

    Fig. 13 — TXV (Metering Device) Position in Reheat Coil (Typical Diagram for Sizes 04-06) The brass fittings are two-piece High Flow valves, with a re- Refrigerant System Pressure Access Ports ceptacle base brazed to the tubing and an integral spring-closed There are two access ports in the system: one on the suction check valve core screwed into the base.

  • Page 11: Puron® (R-410A) Refrigerant

    The compressor is charged with the correct amount of oil at the Amount of refrigerant charge is listed on the unit’s nameplate. factory. Refer to Carrier GTAC2-5 Charging, Recovery, Recycling and Reclamation training manual and the following procedures. Unit panels must be in place when unit is operating during the CAUTION charging procedure.

  • Page 12: R410A Refrigerant

    Cooling Charging Chart Standard 3 Ton R410A Refrigerant 1241 1172 1103 115°F (46°C) 1034 105°F (41°C) 95°F (35°C) 85°F (29°C) 75°F (24°C) OUTDOOR 65°F TEMP (18°C) °F / °C 115 / 46 105 / 41 95 / 35 85 / 29 75 / 24 65 / 18 °F...
  • Page 13 Cooling Charging Chart Standard 4 Ton Single Phase R410A Refrigerant 1241 1172 115°F (46°C) 1103 105°F (41°C) 1034 95°F (35°C) 85°F (29°C) 75°F (24°C) 65°F (18°C) OUTDOOR TEMP °F / °C 115 / 46 105 / 41 95 / 35 85 / 29 75 / 24 65 / 18...
  • Page 14 Cooling Charging Chart Standard 4 Ton Three Phase R410A Refrigerant 1241 1172 115°F (46°C) 105°F (41°C) 1103 95°F (35°C) 85°F (29°C) 1034 75°F (24°C) 65°F (18°C) OUTDOOR TEMP °F / °C 115 / 46 105 / 41 95 / 35 85 / 29 75 / 24 65 / 18...
  • Page 15 Cooling Charging Chart Standard 5 Ton Single Phase R410A Refrigerant 1241 115°F (46°C) 105°F (41°C) 1172 95°F (35°C) 85°F (29°C) 1103 1034 75°F (24°C) 65°F (18°C) OUTDOOR TEMP °F / °C 115 / 46 105 / 41 95 / 35 85 / 29 75 / 24 65 / 18...
  • Page 16 Cooling Charging Chart Standard 5 Ton Three Phase R410A Refrigerant 115°F (46°C) 1241 105°F (41°C) 95°F (35°C) 1172 85°F (29°C) 75°F (24°C) 1103 1034 65°F (18°C) OUTDOOR TEMP °F / °C 115 / 46 105 / 41 95 / 35 85 / 29 75 / 24 65 / 18...

  • Page 17: Filter Drier

    COMPRESSOR ROTATION Filter Drier On 3-phase units with scroll compressors, it is important to be cer- Replace whenever refrigerant system is exposed to atmo- tain compressor is rotating in the proper direction. To determine sphere. Only use factory specified liquid-line filter driers with whether or not compressor is rotating in the proper direction: working pressures no less than 650 psig.

  • Page 18: Convenience Outlets

    Table 1 — Cooling Service Analysis (cont) PROBLEM CAUSE REMEDY Low refrigerant charge. Check for leaks; repair and recharge. Head pressure too low Compressor valves leaking. Replace compressor. Restriction in liquid tube. Remove restriction. High head load. Check for source and eliminate. Excessive suction pressure Compressor valves leaking.

  • Page 19: Duty Cycle

    Duty Cycle The unit-powered convenience outlet has a duty cycle limita- DUCT SMOKE SENSOR tion. The transformer is intended to provide power on an inter- CONTROLLER mittent basis for service tools, lamps, etc; it is not intended to provide 15-amps loading for continuous duty loads (such as electric heaters for overnight use).

  • Page 20: Smoke Detector Locations

    EXHAUST TUBE DUCT SMOKE SENSOR EXHAUST GASKET SENSOR HOUSING AND ELECTRONICS SEE DETAIL INTAKE SUPPLY AIR GASKET SMOKE DETECTOR COVER GASKET (ORDERING OPTION) TSD-CO2 (ORDERING OPTION) SENSOR PLUG COVER Fig. 25 — Typical Supply Air Smoke Detector Sensor Location SAMPLING TUBE (ORDERED SEPARATELY) RETURN AIR WITHOUT ECONOMIZER COUPLING...

  • Page 21: Completing Installation Of Return Air Smoke

    RETURN AIR SAMPLING TUBE Fig. 27 — Return Air Sampling Tube Location Fig. 29 — Return Air Sensor Operating Position Completing Installation of Return Air Smoke FIOP Smoke Detector Wiring and Response Sensor ALL UNITS Unscrew the two screws holding the Return Air Sensor detector plate.

  • Page 22: Sensor And Controller Tests

    48TM500213 L Fig. 30 — Typical Smoke Detector System Wiring Controller Alarm Test Procedure Sensor and Controller Tests Press the controller’s test/reset switch for seven seconds. SENSOR ALARM TEST Verify that the controller’s Alarm LED turns on. The sensor alarm test checks a sensor’s ability to signal an Reset the sensor by pressing the test/reset switch for two alarm state.
  • Page 23 Verify that the test/reset station’s Alarm LED turns off. Table 2 — Dirty LED Test REMOTE TEST/RESET STATION DIRTY SENSOR TEST FLASHES DESCRIPTION The test/reset station dirty sensor test checks the test/reset sta- 0-25% dirty (Typical of a newly installed detector) tion’s ability to initiate a sensor dirty test and indicate the re- 25-50% dirty sults.
  • Page 24 INDICATORS Table 3 — Detector Indicators Normal State The smoke detector operates in the normal state in the absence CONTROL DESCRIPTION of any trouble conditions and when its sensing chamber is free INDICATOR of smoke. In the normal state, the Power LED on both the sen- Magnetic Resets the sensor when it is in the alarm or trouble sor and the controller are on and all other LEDs are off.

  • Page 25: Protective Devices

    Verify that the sensor’s Alarm and Trouble LEDs are now off. LOW PRESSURE SWITCH At the controller, clear its Alarm or Trouble state by pressing The system is protected against a loss of charge and low evapo- and holding the manual reset button (on the front cover) for 2 rator coil loading condition by a low pressure switch located on seconds.

  • Page 26: Single Point Boxes And Supplementary Fuses

    Table 4 — Heater Model Number Bare heater model number Heater Sale Package PNO Includes: Bare Heater Carton and packing materials Installation sheet Not all available heater modules may be used in every unit. Single Point Boxes and Supplementary Fuses Use only those heater modules that are UL listed for use in a When the unit MOCP device value exceeds 60-A, unit-mount- specific size unit.

  • Page 27: Completing Heater Installation

    Completing Heater Installation FIELD POWER CONNECTIONS CONTL Field-supplied tap conductors must be installed between the BOARD base unit’s field power connection lugs and the single point box (with or without fuses). Refer to unit wiring schematic. Use copper wire only. Size these conductors based on the MCA (Minimum Circuit Ampacity) value marked on the 50KC unit’s info plate for the base unit, less electric heater load.

  • Page 28: Economizer Systems

    Fig. 40 — PremierLink Controller ECONOMI$ER IV ECONOMIZER SYSTEMS CONTROLLER The 50KC units may be equipped with a factory-installed or OUTSIDE AIR WIRING accessory (field-installed) economizer system. Three types are TEMPERATURE SENSOR HARNESS available: with a logic control system (EconoMi$er IV and LOW AMBIENT SENSOR EconoMi$er X) and without a control system (EconoMi$er2).
  • Page 29 Fig. 44 — RTU Open Overlay for Economizer Wiring...
  • Page 30 Fig. 45 — VFD Overlay for W2770 Controller Wiring...
  • Page 31 Fig. 46 — EconoMi$er IV Wiring BLACK TRANSFORMER GROUND BLUE 500 OHM RESISTOR VIOLET NOTE 1 PINK OAT SENSOR 24 VAC NOTE 3 50HJ540573 ACTUATOR ASSEMBLY 4-20 mA WHITE DIRECT DRIVE TO J9 ON 4-20mA SIGNAL ACTUATOR PremierLink BOARD ECONOMISER2 PLUG NOTES: 1.

  • Page 32: Economi$Er Iv

    A functional view of the EconoMi$er system is shown in Fig. 48. Typical settings, sensor ranges, and jumper positions are also shown. An EconoMi$er IV simulator program is avail- able from Carrier to help with EconoMi$er IV training and troubleshooting. ECONOMI$ER IV STANDARD SENSORS...
  • Page 33 Determine the EconoMi$er IV control mode before set up of Table 6 — Thermistor Resistance vs Temperature the control. Some modes of operation may require different Values for Space Temperature Sensor, Supply Air sensors. The EconoMi$er IV system is supplied from the facto- Temperature Sensor, and Outdoor Air ry with a supply-air temperature sensor and an outdoor-air tem- Temperature Sensor...
  • Page 34 (29) (32) (35) (38) (41) (43) CONTROL CONTROL POINT CURVE APPROX. deg. F (deg. C) AT 50% RH (27) 73 (23) 70 (21) 67 (19) 63 (17) (24) (21) (18) (16) 0.13 0.20 0.22 0.25 0.30 0.35 0.40 0.45 0.50 (13) STATIC PRESSURE (in.
  • Page 35 Indoor Air Quality (IAQ) Sensor Input To determine the minimum position setting, perform the fol- lowing procedure: The IAQ input can be used for demand controlled ventilation control based on the level of CO measured in the space or re- Calculate the appropriate mixed air temperature using the turn air duct.
  • Page 36 (See Table 7.) Disconnect power at TR and TR1. All LEDs should be off. Use setting 1 or 2 for Carrier equipment. (See Table 7.) Exhaust fan contacts should be open. Press Clear and Mode buttons. Hold at least 5 seconds Disconnect device at P and P1.
  • Page 37 If connected, remove sensor from terminals SO and +. Return EconoMi$er IV settings and wiring to normal after Connect 1.2 kilo-ohm 4074EJM checkout resistor across completing troubleshooting. terminals SO and +. DCV MINIMUM AND MAXIMUM POSITION Put 620-ohm resistor across terminals SR and +. To check the DCV minimum and maximum position: Set minimum position, DCV set point, and exhaust poten- tiometers fully CCW (counterclockwise).

  • Page 38: Economi$Er X (Factory Option)

    User Interface ® Economi$er X (Factory Option) Provides status for normal operation, setup parameters, check- The EconoMi$er X system is an expandable economizer con- out tests, and alarm and error conditions with a 2-line 16 char- trol system, which includes a W7220 economizer module (con- acter LCD display and four button keypad.
  • Page 39 Storage Temperature Table 8 — Economizer Module - Left Hand Terminal –40°F to 150°F (–40°C to 65°C) Blocks Shipping Temperature LABEL TYPE DESCRIPTION –40°F to 150°F (–40°C to 65°C) Top Left Terminal Block Relative Humidity 20k NTC Mixed Air Temperature Sensor (Polarity 5% to 95% RH non-condensing and COM Insensitive Connection)
  • Page 40 SENSOR (HOT) BLACK YELLOW ANALOG BROWN – ORANGE GREEN SWITCH POWER SUPPLY. PROVIDE DISCONNECT LABEL MEANS AND OVERLOAD PROTECTION AS REQUIRED. Fig. 60 — CO Sensor Wiring SWITCHES INTERFACE OVERVIEW This section describes how to use the EconoMi$er ® user inter- face for: •...
  • Page 41 Press the (Enter) button to display the value of the • ADVANCED SETUP currently displayed item. • CHECKOUT Press the ▲ button to increase (change) the displayed • ALARMS parameter value. NOTE: Some parameters in the menus use the letters MA or Press the ▼...
  • Page 42 Table 12 — W7220 Menu Structure* PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † FIRST STAGE COOLING DEMAND (Y1–IN) ECON 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...
  • Page 43 Table 12 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † EXHAUST STAGE 2 RELAY OUTPUT Output of AUX1 O terminal Displays ON when damper position reaches programmed EXH2 OUT ON/OFF percentage set point.
  • Page 44 Table 12 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † Display order = MM/DD/YY INSTALL 01/01/10 Setting order = DD, MM, then YY. UNITS DEG °F °F or °C Sets economizer controller in degrees Fahrenheit or Celsius CONV CONV = conventional;...
  • Page 45 Table 12 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † RETURN AIR TEMPERATURE CALIBRATION RA T CAL 0.0°F ± 2.5°F Allows for the operator to adjust for an out of calibration temperature sensor.
  • Page 46 Table 12 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † ACTUATOR VOLTAGE LOW ACT UNDER V Voltage received by actuator is above expected range. ALARMS ACTUATOR VOLTAGE HIGH ACT OVER V (cont) Voltage received by actuator is below expected range.
  • Page 47 Table 15 — Dry Bulb Operation With DCV (CO Sensor) — 1 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I FAN SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED VENTILATION (DCV) ECONOMIZE High 0-v/Off 0-v/Off Closed VENTMIN High 24-v/On 0-v/Off Closed VENTMIN High 24-v/On...
  • Page 48 ENTHALPY SETTINGS When the OA temperature, OA humidity and OA dew point are all below the selected boundary, the economizer sets the econo- When the OA temperature, enthalpy and dew point are below the mizing mode to YES, economizing is available. respective set points, the Outdoor Air can be used for economiz- When all of the OA conditions are above the selected boundary, ing.

  • Page 49: Wiring Diagrams

    CHECKOUT The Checkout tests can all be performed at the time of installa- tion or at any time during the operation of the system as a test Inspect all wiring connections at the economizer module’s termi- that the system is operable. nals, and verify compliance with the installation wiring diagrams.
  • Page 50 Fig. 63 — 50KC Typical Unit Wiring Diagram - Power (06A, 208/230-3-60)
  • Page 51 Fig. 64 — 50KC Unit Wiring Diagram - Control (A06)

  • Page 52: Pre-Start-Up

    PRE-START-UP START-UP, GENERAL Unit Preparation Make sure that unit has been installed in accordance with in- WARNING stallation instructions and applicable codes. PERSONAL INJURY HAZARD Return-Air Filters Failure to follow this warning could result in personal injury Make sure correct filters are installed in unit (see “APPENDIX or death.

  • Page 53: Ventilation (Continuous Fan)

    Set system selector switch at HEAT position and set thermostat During Occupied mode operation, indoor fan operation will be at a setting above room temperature. Set fan at AUTO position. accompanied by economizer dampers moving to Minimum Position set point for ventilation. If indoor fan is off, dampers First stage of thermostat energizes the first-stage electric heater will close.

  • Page 54: Fastener Torque Values

    FASTENER TORQUE VALUES See Table 19 for torque values. Table 19 — Torque Values FASTENER LOCATIONS TORQUE VALUES Supply fan motor mounting 120 ± 12 in.-lb Supply fan motor adjustment plate 120 ± 12 in.-lb Motor pulley setscrew 72 ± 5 in.-lb Fan pulley setscrew 72 ±...

  • Page 55: Appendix A - Model Number Significance

    APPENDIX A — MODEL NUMBER SIGNIFICANCE 11 12 13 15 16 17 18 Packaging and Seismic Compliant 0 = Standard 1 = LTL Unit Heat Type 50 – Cooling with Electric Heat Electrical Options A = None C = Non-Fused Disconnect Series/Model D = Thru-the-Base Connections KC –...
  • Page 56 Table A — Serial Number Format POSITION NUMBER TYPICAL POSITION DESIGNATES Week of manufacture (fiscal calendar) Year of manufacture (“08” = 2008) Manufacturing location (C = Monterrey, Mexico) 6-10 Sequential number...

  • Page 57: Appendix B - Physical Data

    APPENDIX B — PHYSICAL DATA Table B — PHYSICAL DATA (Cooling) 3-5 Tons 50KC*A04 50KC*A05 50KC*A06 Refrigeration System # Circuits / # Comp. / Type 1 / 1 / Scroll 1 / 1 / Scroll 1 / 1 / Scroll R-410a charge A 1 phase (lbs-oz) 7 - 2 10 - 8...
  • Page 58 Table B — PHYSICAL DATA (Cooling) 3-5 Tons (cont) 50KC*A04 50KC*A05 50KC*A06 Cond. coil Material Cu / Al Cu / Al Cu / Al Coil Type ” RTPF ” RTPF ” RTPF 1 phase Rows / FPI 1 / 17 2 / 17 2 / 17 Total Face Area (ft...

  • Page 59: Appendix C - Fan Performance

    External static pressure is the static pressure difference option. between the return duct and the supply duct plus the static For information on the electrical properties of Carrier’s pressure caused by any FIOPs or accessories. motors, please see the Electrical information section of Tabular data accounts for pressure loss due to clean filters, this book.
  • Page 60 Table D — 50KC**04 3 Ton Vertical Supply (1 Phase) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.15 0.25 0.37 0.52 1084 0.68 0.17 0.28 0.40 0.55 1092 0.71 1050 0.19 0.30 0.43 1003 0.58 1102 0.75 1125 0.22 0.34 0.47 1017 0.62 1113...
  • Page 61 Table E — 50KC**04 3 Ton Horizontal Supply (3 Phase) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.13 0.23 0.34 0.47 0.61 0.15 0.25 0.37 0.50 1015 0.64 1050 0.18 0.28 0.40 0.53 1030 0.68 1125 0.20 0.31 0.43 0.57 1047 0.72 1200 0.23...
  • Page 62 Table G — 50KC**05 4 Ton Horizontal Supply (1 Phase) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.23 0.34 0.47 0.61 1064 0.76 0.28 0.39 0.52 1007 0.67 1088 0.82 1050 0.33 0.45 0.58 1034 0.73 1113 0.89 1125 0.38 0.51 0.65 1061 0.80...
  • Page 63 Table I — 50KC**05 4 Ton Horizontal Supply (3 Phase) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.23 0.34 0.47 0.61 1064 0.76 0.28 0.39 0.52 1007 0.67 1088 0.82 1050 0.33 0.45 0.58 1034 0.73 1113 0.89 1125 0.38 0.51 0.65 1061 0.80...
  • Page 64 Table J — 50KC**05 4 Ton Vertical Supply (3 Phase) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.25 0.37 0.51 1032 0.66 1126 0.83 0.30 0.43 0.57 1053 0.72 1145 0.89 1050 0.36 0.49 0.63 1077 0.79 1166 0.97 1125 0.42 0.56 1011 0.71...
  • Page 65 Table L — 50KC**06 5 Ton Vertical Supply (1 Phase) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.41 0.55 0.69 1074 0.85 1147 1.00 0.49 0.64 1034 0.80 1113 0.96 1185 1.13 1050 0.59 0.75 1075 0.92 1153 1.09 1223 1.26 1125 0.70 1033...
  • Page 66 Table N — 50KC**06 5 Ton Vertical Supply (3 Phase) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.41 0.55 0.69 1074 0.85 1147 1.00 0.49 0.64 1034 0.80 1113 0.96 1185 1.13 1050 0.59 0.75 1075 0.92 1153 1.09 1223 1.26 1125 0.70 1033...

  • Page 67: Appendix D - Electrical Data

    APPENDIX D — ELECTRICAL DATA Table P — 50KC**04 (3 Tons) Cooling UNIT VOLTAGE COMP 1 OFM (ea) v-Ph-Hz RANGE EFF at Full WATTS TYPE Load DD-STD 16.6 208-1-60 HIGH DD-STD 16.6 230-1-60 HIGH DD-STD 10.4 208-3-60 HIGH DD-STD 10.4 230-3-60 HIGH DD-STD...
  • Page 68 Table R — 50KC**06 (5 Tons) Cooling UNIT VOLTAGE COMP 1 OFM (ea) v-Ph-Hz RANGE EFF at Full WATTS TYPE Load DD-STD 25.0 208-1-60 DD-STD 25.0 230-1-60 DD-STD 15.9 208-3-60 HIGH DD-STD 15.9 230-3-60 HIGH DD-STD 460-3-60 HIGH DD-STD 575-3-60 HIGH Example: Supply voltage is 230-3-60 Legend and Notes for Tables P-X.
  • Page 69 Table S — 50KC**04 - MCA/MOCP Determination (No CO or Unpowered CO) ELEC. HEATER NO CO OR UNPWRD CO NO PE w/ PE (pwrd fr/unit) FUSE DISC SIZE FUSE DISC SIZE TYPE CRHEATER***A00 NOM (kW) HACR HACR BRKR BRKR NONE —...
  • Page 70 Table T — 50KC**04 - MCA/MOCP Determination (Powered CO) ELEC. HEATER PWRD CO NO PE w/ PE (pwrd fr/unit) FUSE DISC SIZE FUSE DISC SIZE TYPE CRHEATER***A00 NOM (kW) HACR HACR BRKR BRKR NONE — — 101A 3.3/4.4 15.9/18.3 36/39 50/50 34/35 93/93...
  • Page 71 Table U — 50KC**05 - MCA/MOCP Determination (No CO or Unpowered CO) ELEC. HEATER NO CO OR UNPWRD CO NO PE w/ PE (pwrd fr/unit) FUSE DISC SIZE FUSE DISC SIZE TYPE CRHEATER***A00 NOM (kW) HACR HACR BRKR BRKR NONE —...
  • Page 72 Table V — 50KC**05 - MCA/MOCP Determination (Powered CO) ELEC. HEATER PWRD CO NO PE w/ PE (pwrd fr/unit) FUSE DISC SIZE FUSE DISC SIZE TYPE CRHEATER***A00 NOM (kW) HACR HACR BRKR BRKR NONE — — 101A 3.3/4.4 15.9/18.3 41/41 60/60 41/41 133/133...
  • Page 73 Table W — 50KC**06 - MCA/MOCP Determination (No CO or Unpowered CO) ELEC. HEATER NO CO OR UNPWRD CO NO PE w/ PE (pwrd fr/unit) FUSE DISC SIZE FUSE DISC SIZE TYPE CRHEATER***A00 NOM (kW) HACR HACR BRKR BRKR NONE —...
  • Page 74 Table X — 50KC**06 - MCA/MOCP Determination (Powered CO) ELEC. HEATER PWRD CO NO PE w/ PE (pwrd fr/unit) FUSE DISC SIZE FUSE DISC SIZE TYPE CRHEATER***A00 NOM (kW) HACR HACR BRKR BRKR NONE — — 102A 4.9/6.5 23.5/27.1 45/50 60/60 44/45 149/149...

  • Page 75: Appendix E - Wiring Diagrams

    APPENDIX E — WIRING DIAGRAMS Table Y — Wiring Diagrams 50KC DRAWING NUMBER.REV Size Voltage Control Power 208/230-1-60 48TM500211 (page 77) 208/230-3-60 48TM500214 (page 79) 460-3-60 48TM500214 (page 79) 575-3-60 48TM500214 (page 79) 208/230-1-60 48KC000133 (page 78) 208/230-3-60 48TM500214 (page 79) 48TM500212 (page 76) 460-3-60 48TM500214 (page 79)
  • Page 76 Fig. B — Unit Wiring Diagram (Controls) for Sizes A04-A06 (208/230-1-60, 208/230-3-60, 460-3-60, 575-3-60)
  • Page 77 Fig. C — Unit Wiring Diagram (Power) for Sizes A04 and A06 (208/230-1-60)
  • Page 78 Fig. D — Unit Wiring Diagram (Power) for Size A05 (208/230-1-60)
  • Page 79 Fig. E — Unit Wiring Diagram (Power) for Sizes A04-A06 (208/230-3-60, 460-3-60, 575-3-60)

  • Page 80: Locations

    APPENDIX F — MOTORMASTER SENSOR LOCATIONS Fig. F — 50KC*A04 Outdoor Circuiting Fig. G — 50KC*A05 Outdoor Circuiting...
  • Page 81 Fig. H — 50KC*A06 Outdoor Circuiting...
  • Page 82 © Carrier Corporation 2019 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500223-01 Printed in U.S.A. Form 50KC-4-6-01SM Pg 82 2-19 Replaces: NEW...

  • Page 83: Start-Up Checklist

    START-UP CHECKLIST (REMOVE AND STORE IN 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 preced- ing sections of this Installation Instruction document.
  • Page 84 9. Open humidistat input compressor and outdoor fan stop; LSV and DSV solenoids de-energized (Y/N) _____ 10. Restore set-points for thermostat and humidistat (Y/N) _____ © Carrier Corporation 2019 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

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