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Bryant Preferred 549K 04-06 Service And Maintenance Instructions

Single package rooftop heat pump with puron (r-410a) refrigerant
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Preferred™ Series
549K 04-06
Single Package Rooftop Heat Pump
with Puron
(R-410A) Refrigerant
®
Service and Maintenance Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 2
UNIT ARRANGEMENT AND ACCESS . . . . . . . . . . . . . . 3
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SUPPLY FAN (BLOWER) SECTION . . . . . . . . . . . . . . . . 4
Supply Fan (Direct-Drive) . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Staged Air Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Condenser Coil (Outdoor) . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Evaporator Coil (Indoor) . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Refrigeration System Components . . . . . . . . . . . . . . . . . . 11
Evaporator Coil Metering Devices . . . . . . . . . . . . . . . . . . 12
TXV Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Replacing TXV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Refrigerant System Pressure Access Ports . . . . . . . . . . . . 12
PURON (R-410A) REFRIGERANT . . . . . . . . . . . . . . . . . 13
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
COOLING CHARGING CHARTS . . . . . . . . . . . . . . . . . 13
COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Replacing Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Condenser-Fan Adjustment . . . . . . . . . . . . . . . . . . . . . . . . 15
Troubleshooting Cooling System . . . . . . . . . . . . . . . . . . . . 16
CONVENIENCE OUTLETS . . . . . . . . . . . . . . . . . . . . . . 17
Convenience Outlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Installing Weatherproof Cover . . . . . . . . . . . . . . . . . . . . . 17
Non-Powered Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Unit-Powered Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Fuse on Powered Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
COMMERICAL DEFROST CONTROL . . . . . . . . . . . . 18
Reversing Valve Control . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Compressor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Auxiliary (Electric) Heat control . . . . . . . . . . . . . . . . . . . . 19
Defrost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
ELECTRIC HEATERS . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Safety Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Completing Heater Installation . . . . . . . . . . . . . . . . . . . . . 21
SMOKE DETECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Smoke Detector Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Smoke Detector Locations . . . . . . . . . . . . . . . . . . . . . . . . . 22
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53549011-01
Page
Printed in U.S.A.
Form SM549K-4-6-01
Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
SENSOR AND CONTROLLER TESTS . . . . . . . . . . . . . 24
Sensor Alarm Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Controller Alarm Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Dirty Controller Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Dirty Sensor Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Changing the Dirt Sensor Test . . . . . . . . . . . . . . . . . . . . . 25
Remote Station Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
SD-TRM4 Remote Alarm Test Procedure . . . . . . . . . . . . 25
Dirty Sensor Test Using an SD-TRM4 . . . . . . . . . . . . . . . 25
Detector Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
PROTECTIVE DEVICES . . . . . . . . . . . . . . . . . . . . . . . . . 27
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Relief Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Control Circuit, 24-V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
RTU OPEN CONTROL SYSTEM . . . . . . . . . . . . . . . . . . 28
Sensory/Accessory Installation . . . . . . . . . . . . . . . . . . . . . 28
ECONOMIZER SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . 29
EconoMi$er2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
EconoMi$er X (Factory Option) . . . . . . . . . . . . . . . . . . . . 38
PRE-START-UP/START-UP . . . . . . . . . . . . . . . . . . . . . . 49
START-UP, GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Additional Installation/Inspection . . . . . . . . . . . . . . . . . . 50
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Outdoor-Air Inlet Screens . . . . . . . . . . . . . . . . . . . . . . . . . 50
Compressor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Refrigerant Service Ports . . . . . . . . . . . . . . . . . . . . . . . . . 50
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Refrigerant Service Ports . . . . . . . . . . . . . . . . . . . . . . . . . 50
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Ventilation (Continuous Fan) . . . . . . . . . . . . . . . . . . . . . . 51
FASTENER TORQUE VALUES . . . . . . . . . . . . . . . . . . . 51
START-UP, RTU OPEN CONTROLS . . . . . . . . . . . . . . 51
APPENDIX A - MODEL NUMBER
NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
APPENDIX B - PHYSICAL DATA . . . . . . . . . . . . . . . . 53
APPENDIX C - FAN PERFORMANCE . . . . . . . . . . . . 54
APPENDIX D - WIRING DIAGRAMS . . . . . . . . . . . . . 79
APPENDIX E - LOW AMBIENT CONTROL SENSOR
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . CL-1
Pg 1
12-2020
Replaces: New

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Summary of Contents for Bryant Preferred 549K 04-06

  • Page 1: Table Of Contents

    Preferred™ Series 549K 04-06 Single Package Rooftop Heat Pump with Puron (R-410A) Refrigerant ® Service and Maintenance Instructions CONTENTS Page Completing Installation of Return Air Smoke Detector ........23 SAFETY CONSIDERATIONS .

  • Page 2: Safety Considerations

    SAFETY CONSIDERATIONS WARNING Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. UNIT OPERATION AND SAFETY HAZARD Only trained and qualified service personnel should install, re- pair, or service air-conditioning equipment. Untrained person- Failure to follow this warning could cause personal injury, nel can perform the basic maintenance functions of replacing death and/or equipment damage.

  • Page 3: Unit Arrangement And Access

    UNIT ARRANGEMENT AND ACCESS • Check refrigerant charge level • Ensure indoor coils are clean General • Check supply blower motor amperage Figures 1 and 2 show general unit arrangement and access Electric Heating locations. • Inspect power wire connections FILTER ACCESS PANEL •...

  • Page 4: Supply Fan (Blower) Section

    Supply Fan (Direct-Drive) All 549K units have the Axion™ Fan Technology direct drive 17 1/4” vane axial fan system. The fan is driven by an ECM motor with speed that is user set through the Unit Control Board (UCB). Speeds are fully configurable from 40% to 100% of motor’s maximum speed.
  • Page 5 Units with Electro-mechanical controls The Fan Speed set up controls are located on the lower section of the Unit Control Board (UCB). See Fig. 7 for location. 1. Check the job specifications for the CFM (cubic feet per minute) and ESP (external static pressure) required. 2.
  • Page 6 ESP in. wg Factory Setting: Calculator 9.0 V 1500 Field Setting: 1625 Record field setting here 1750 1875 2000 Switch Range: 2125 10.0 2250 4.1 - 7.5 2375 6.9 - 8.7 2500 7.7 - 10.0 Field Accessories: Economizer * Overlap in A, B, C switch range 1 Stage E Heat designed for maximum field adjustment potential.
  • Page 7 TROUBLESHOOTING THE ECM MOTOR Axion™ Fan Technology motors are designed with several built-in protections included in the motor software. If the motor detects a fault it will safely shut down. For temperature related faults the motor requires a line voltage reset to continue opera- tion.
  • Page 8 6. Install four #10-32 x -in. hex head machine screws (P/N: AD07AB126) to connect aluminum stator to motor. Tighten to 23 in.-lb (2.6 Nm). 7. Fit grommet on motor wire harness into keyhole feature on the side of the stator and pull wire harness out through grommet.

  • Page 9: Staged Air Volume

    Condenser Coil (Outdoor) Reinstalling Motor and Fan Assembly See Fig. 13. The condenser coil is fabricated with round tube copper hairpins and plate fins of various materials and/or coatings (see Model 1. Align motor harness/grommet at ~7 o’clock (facing Number Nomenclature in Appendix A to identify the materials installer) and align the bottom flats on right and left sides provided in this unit).
  • Page 10 Two-Row Condenser Coils Clean coil as follows: COIL CLIPS 1. Turn off unit power, tag disconnect. 2. Remove all screws from the top panel except the screws securing the condenser fan to the top panel. See Fig. 14. TOP PANEL REMOVE REMOVE SCREWS SCREWS...

  • Page 11: Evaporator Coil

    Hold garden sprayer nozzle close to finned areas and apply cleaner with a vertical, up-and-down motion. Avoid spraying CAUTION in horizontal pattern to minimize potential for fin damage. 7. Ensure cleaner thoroughly penetrates deep into finned UNIT DAMAGE HAZARD areas. Interior and exterior finned areas must be thor- Failure to follow this caution may result in reduced unit oughly cleaned.

  • Page 12: Evaporator Coil Metering Devices

    Table 3 — Cooling Mode (each circuit) 3. Remove TXV using a wrench and an additional wrench on connections to prevent damage to tubing. COMPONENT STATUS/POSITION 4. Remove equalizer tube from suction line of coil. Use file Reversing Valve Energized or tubing cutter to cut brazed equalizer line approximately Check Valve A Closed...

  • Page 13: Puron (R-410A) Refrigerant

    Refrigerant Charge 48.8 Amount of refrigerant charge is listed on the unit’s nameplate. Refer to Bryant GTAC2-5 Charging, Recovery, Recycling and 37.7 Reclamation training manual and the following procedures. Unit panels must be in place when unit is operating during the charging procedure.

  • Page 14: Compressor

    4 Ton 50GCQ / 549K / RHW CAUTION R410A Refrigerant Charging Chart (Unit must run in cooling mode, on high stage compressors & outdoor fan on high speed) UNIT DAMAGE HAZARD 59.9 Failure to follow this caution may result in damage to com- ponents.

  • Page 15: Filter Drier

    NOTE: When the compressor is rotating in the wrong direction, the unit makes an elevated level of noise and does not provide CAUTION cooling. On 3-phase units with scroll compressors, it is important to be EQUIPMENT DAMAGE certain compressor is rotating in the proper direction. To deter- Failure to follow this caution can result in equipment mine whether or not compressor is rotating in the proper damage.

  • Page 16: Troubleshooting Cooling System

    Troubleshooting Cooling System Refer to Table 6 for additional troubleshooting topics. Table 6 — 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 17: Convenience Outlets

    CONVENIENCE OUTLETS and location. Route 125-v power supply conductors into the bottom of the utility box containing the duplex receptacle. GFCI RECEPTACLE WARNING COVER - WHILE-IN-USE NOT INCLUDED WEATHERPROOF ELECTRICAL OPERATION HAZARD Failure to follow this warning could result in personal injury or death.

  • Page 18: Duty Cycle

    COMMERICAL DEFROST CONTROL Duty Cycle On 549K units equipped with electro-mechanical controls or the The unit-powered convenience outlet has a duty cycle limita- optional factory-installed RTU Open controller the Defrost Con- tion. The transformer is intended to provide power on an inter- trol Board (DFB) coordinates thermostat demands for supply fan mittent basis for service tools, lamps, etc;...

  • Page 19: Reversing Valve Control

    Table 7 — 549K Defrost Board I/O and Jumper Configurations POINT NAME TYPE OF I/O CONNECTION PIN NUMBER UNIT CONNECTION NOTE INPUTS G Fan DI, 24 vac P2-3 CTB-G Y1 Cool 1 DI, 24 vac P2-5 CTB-Y1 Y2 Cool 2 DI, 24 vac P2-4 CTB-Y2...

  • Page 20: Electric Heaters

    Table 8 — DIP Switch Positions • • • • • • • • • 30 minutes 60 minutes 90 minutes 120 minutes Fan Delay (factory default) ELECTRIC HEATERS The 549K units can be equipped with field-installed accessory electric heaters. The heaters are modular in design, with heater frames holding open coil resistance wires strung through ce- ramic insulators and control contactor(s), using a combination of 24-v control side break/auto-reset or line-break/auto-reset...

  • Page 21: Completing Heater Installation

    Line-break/auto-reset limit switches, 24-v control side break/auto-reset and line-break/non-resettable “one shot” limit switches are mounted on the base plate of each heater module. See Fig. 36. These are accessed through the indoor access panel. Remove the switch by removing two screws into the base plate and extracting the existing switch.

  • Page 22: Smoke Detector Sensor

    Smoke Detector Sensor Smoke Detector Locations The smoke detector sensor (see Fig. 39) includes a plastic SUPPLY AIR housing, a printed circuit board, a clear plastic cover, a sam- The supply air smoke detector sensor is located to the right of the pling tube inlet and an exhaust tube.

  • Page 23: Completing Installation Of Return Air Smoke

    RETURN AIR SMOKE DETECTOR SENSOR WITH 3. Rotate the detector plate so the sensor is facing outwards and the sampling tube connection is on the bottom. See ECONOMIZER Fig. 44. The sampling tube is inserted through the side plates of the economizer housing, placing it across the return air opening on RETURN AIR SMOKE DETECTOR the unit basepan.

  • Page 24: Sensor And Controller Tests

    Fig. 45 — Typical Smoke Detector System Wiring ADDITIONAL APPLICATION DATA Refer to the application data document “Factory Installed IMPORTANT: Failure to follow this ALERT can result Smoke Detectors for Small and Medium Rooftop Units 2 to 25 in an unnecessary evacuation of the facility. Tons”...

  • Page 25: Changing The Dirt Sensor Test

    Table 9 — Dirty LED Test FLASHES DESCRIPTION 0-25% dirty. (Typical of a newly installed detector) SMOKE DETECTOR 25-50% dirty CONTROLLER 51-75% dirty − 76-99% dirty AUXILIARY EQUIPMENT DIRTY SENSOR TEST PROCEDURE 1. Hold the test magnet where indicated on the side of the sensor housing for two seconds.

  • Page 26: Indicators

    4. Lift the housing away from the printed circuit board. • A wiring fault between a sensor and the controller is 5. Gently remove dirt and debris from around the optic plate detected. and inside the optic housing. • An internal sensor fault is detected. 6.

  • Page 27: Protective Devices

    2. Check the wiring between the sensor and the controller. If LOW PRESSURE SWITCH wiring is loose or missing, repair or replace as required. The system is protected against a loss of charge and low evapo- rator coil loading condition by a low pressure switch located on CONTROLLER’S POWER LED IS OFF the suction line near the compressor.

  • Page 28: Rtu Open Control System

    The RTU Open controller is an integrated component of the Open must be routed through the raceway built into the corner Bryant rooftop unit. Its internal application programming post of the unit or secured to the unit control box with electrical provides optimum performance and energy efficiency.

  • Page 29: Additional Rtu Open Installation And Troubleshooting

    Additional RTU Open Installation and Troubleshooting OUTSIDE AIR TEMPERATURE SENSOR Additional installation, wiring and troubleshooting information ECONOMI$ER X HARNESS for the RTU Open Controller can be found in the following manual: “RTU Open Multi-Protocol Controller Factory- Installed Option – Controls, Start-up, Operation and Trouble- shooting Instructions.”...

  • Page 30: Economi$Er2

    EconoMi$er2 IMPORTANT: The optional EconoMi$er 2 does not ® include a controller. The EconoMi$er2 is operated by a 4 to 20 mA signal from an existing field-supplied control- ler. See Fig. 53 for wiring information. BLACK TRANSFORMER GROUND BLUE 500 OHM RESISTOR VIOLET PINK...

  • Page 31: Economi$Er Iv (Field-Installed Accessory)

    EconoMi$er IV (Field-Installed Accessory) IMPORTANT: For 549K rooftop units EconoMi$er IV is only available as a field-installed accessory. ECONOMI$ER IV STANDARD SENSORS Troubleshooting instructions are enclosed. A functional view of the EconoMi$er IV accessory is shown in Fig. 54. Typical ®...
  • Page 32 Table 11 — EconoMi$er IV Input/Output Logic INPUTS OUTPUTS Demand Enthalpy* Compressor N Terminal† Controlled Ventilation Outdoor Return Stage 1 Stage 2 Occupied Unoccupied (DCV) High (Free Cooling Minimum position Closed LED Off) Below set (DCV LED Off) Modulating** (between Modulating** (between min.
  • Page 33 Table 12 — Supply Air Sensor Temperature/Resistance point, the outdoor-air damper moves to its minimum position. Values The outdoor enthalpy changeover set point is set with the out- door enthalpy set point potentiometer on the EconoMi$er ® TEMPERATURE (F) RESISTANCE (ohms) controller.
  • Page 34 HORIZONTAL ECONOMIZER BAROMETRIC RELIEF FLOW VERTICAL ECONOMIZER BAROMETRIC RELIEF FLOW 2500 2500 Horizontal Economizers Vertical Economizers 2000 2000 1500 1500 3-5 Ton 3-5 Ton 6 Ton 6 Ton 1000 1000 0.05 0.15 0.25 0.05 0.15 0.25 RETURN DUCT STATIC PRESSURE (in. wg) RETURN DUCT STATIC PRESSURE (in.
  • Page 35 Exhaust Set Point Adjustment The exhaust set point will determine when the exhaust fan runs (29) (32) (35) (38) (41) (43) based on damper position (if accessory power exhaust is in- CONTROL CONTROL POINT stalled). The set point is modified with the Exhaust Fan set CURVE APPROX.
  • Page 36 EconoMi$er IV control will be in occu- Use setting 1 or 2 for Bryant equipment. pied mode. When the timeclock contacts are open (removing the 24-v signal from terminal N), the EconoMi$er IV will be in 1.
  • Page 37 9. Set minimum position, DCV set point, and exhaust poten- DCV MINIMUM AND MAXIMUM POSITION tiometers fully CCW (counterclockwise). To check the DCV minimum and maximum position: 10. Set DCV maximum position potentiometer fully CW 1. Make sure EconoMi$er IV preparation procedure has been (clockwise).

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

    EconoMi$er X (Factory Option) Economizer Module The module is the core of the EconoMi$er X system. The mod- The EconoMi$er X system is an expandable economizer con- ® ule is mounted in the unit’s control box, and includes the user trol system, which includes a W7220 economizer module (con- interface for the system.
  • Page 39 INPUTS Sensors NOTE: A Mixed Air (MA) analog sensor is required on all W7220 units; either an Outdoor Air (OA) sensor for dry bulb change over or an OA bus sensor for outdoor enthalpy change over is required in addition to the MA sensor. An additional Re- turn Air (RA) bus sensor can be added to the system for differen- tial enthalpy or dry bulb changeover.
  • Page 40 Table 14 — Economizer Module - Right Hand Terminal Table 15 — HH57AC081 Sensor Wiring Terminations Blocks TERMINAL TYPE DESCRIPTION LABEL TYPE DESCRIPTION NUMBER LABEL Top Right Terminal Blocks S-BUS Communications AUX2 I 24 vac IN The first terminal is not used. S-BUS S-BUS (Enthalpy Control...
  • Page 41 • Press the ▼ (Down arrow) button to move to the next 7. Press the (Enter) button to accept the displayed value menu. and store it in nonvolatile RAM. “CHANGE STORED” displays. • Press the (Enter) button to display the first item in the 8.
  • Page 42 Table 17 — W7220 Menu Structure* PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT † ECONO AVAIL YES/NO FIRST STAGE COOLING DEMAND (Y1–IN) YES = economizing available; the system can use outside air for free cooling when required ECONOMIZING YES/NO FIRST STAGE COOLING RELAY OUTPUT...
  • Page 43 Table 17 — W7220 Menu Structure* (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT † MECH COOL ON 0, 1, or 2 Displays stage of mechanical cooling that is active. HEAT STAGES ON Displays the stage of heat pump heating that is active. STATUS FAN SPEED LOW or HIGH...
  • Page 44 Table 17 — W7220 Menu Structure* (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT † ERV OAT SP †† 32°F 0 to 50°F ENERGY RECOVERY VENTILATOR UNIT OUTDOOR AIR increment by 1 TEMPERATURE SETPOINT Only displayed when AUX1 O = ERV EXH1 SET 0 to 100% Exhaust fan set point for single speed units.
  • Page 45 Table 17 — W7220 Menu Structure* (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT † STG3 DLY 2.0h 0 min, 5 min, COOLING STAGE 3 DELAY 15 min, then Delay after stage 2 cool has been active. Turns on second stage of 15 min intervals.
  • Page 46 Table 17 — W7220 Menu Structure* (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT † DA SYLK T ERR DISCHARGE AIR S-BUS SENSOR ERROR Discharge air sensor has failed or become disconnected - check wiring then replace sensor if the alarm continues. OA SENS T ERR OUTSIDE AIR TEMPERATURE SENSOR ERROR Outdoor air temperature sensor has failed or become disconnected -...
  • Page 47 Enthalpy Settings all below the selected boundary, the economizer sets the econo- mizing mode to YES, economizing is available. When the OA temperature, enthalpy and dew point are below the respective setpoints, the Outdoor Air can be used for econ- When all of the OA conditions are above the selected bound- omizing.
  • Page 48 Standard or Single Speed Fan Operation The W (heating mode) is not controlled by the W7220 but it re- quires the status to know where to position the OA damper for FAN TYPE = 1SPEED is not used on 549K units. minimum position for the fan speed.

  • Page 49: Pre-Start-Up/Start-Up

    2SP H/C and 3 Speed Fan Operation TROBLESHOOTING Alarms FAN TYPE = 2SP H/C and FAN TYPE = 3SPEED are not used on 549K units. The economizer module provides alarm messages that display on the 2-line LCD. CHECKOUT NOTE: Upon power up, the module waits 60 minutes before Inspect all wiring connections at the economizer module’s termi- checking for alarms.

  • Page 50: Start-Up, General

    Return-Air Filters Ensure correct filters are installed in unit. (See “APPENDIX B — WARNING PHYSICAL DATA” on page 53.). Do not operate unit without return-air filters. ELECTRICAL OPERATION HAZARD Failure to follow this warning could result in personal Outdoor-Air Inlet Screens injury or death.

  • Page 51: Heating

    FASTENER TORQUE VALUES Reset thermostat at a position above room temperature. Com- pressor will shut off. Evaporator fan will shut off after a Table 21 — Torque Values 30-second delay. To shut off unit, set system selector switch at OFF position. Heat shield screws 30 in.-lb (3.4 Nm) ±2 in.-lb (0.2 Nm) Resetting thermostat at a position above room temperature...

  • Page 52: Nomenclature

    APPENDIX A — MODEL NUMBER NOMENCLATURE Position: 9 10 11 12 13 14 15 16 17 Example: Unit Type Packaging and Control Heat Pump RTU with optional A = Standard Packaging, electro-mechanical Electric Heat, Preferred™ Series controls, no intake or exhaust option. Will allow for use of all field-installed economizers, manual or 2-position damper.

  • Page 53: Appendix B - Physical Data

    APPENDIX B — PHYSICAL DATA 549K 3 TO 5 TON PHYSICAL DATA 549K UNIT 549K*04N 549K*05N 549K*06N NOMINAL TONS BASE UNIT OPERATING WT (lb)* REFRIGERATION SYSTEM No. Circuits/No. Compressors/Type 1 / 1 / 2-Stage Scroll 1 / 1 / 2-Stage Scroll 1 / 1 / 2-Stage Scroll Puron ®...

  • Page 54: Appendix C - Fan Performance

    APPENDIX C — FAN PERFORMANCE GENERAL FAN PERFORMANCE NOTES 1. Interpolation is permissible. Do not extrapolate. 2. External static pressure is the static pressure difference between the return duct and the supply duct plus the static pressure caused by any FIOPs or accessories. 3.
  • Page 55 APPENDIX C — FAN PERFORMANCE 549K*04N SINGLE PHASE — 3 TON VERTICAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1059 0.08 1325 0.16 1541 0.25 1718 0.35 1870 0.46 1102 0.09 1356 0.17 1572 0.27 1751 0.37 1906 0.48 1050...
  • Page 56 APPENDIX C — FAN PERFORMANCE 549K*04N SINGLE PHASE – MEDIUM STATIC — 3 TON VERTICAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1060 1325 1541 1718 1871 1103 1355 1572 1752 1906 1050 1150 1387 1602 1784 1941 1125 1198...
  • Page 57 APPENDIX C — FAN PERFORMANCE 549K*04N THREE PHASE — 3 TON VERTICAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1058 0.08 1325 0.16 1541 0.25 1718 0.35 1870 0.46 1102 0.09 1356 0.17 1572 0.27 1751 0.37 1906 0.48 1050...
  • Page 58 APPENDIX C — FAN PERFORMANCE 549K*04N THREE PHASE – MEDIUM STATIC — 3 TON VERTICAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1060 1325 1541 1718 1871 1103 1355 1572 1752 1906 1050 1150 1387 1602 1784 1941 1125 1198...
  • Page 59 APPENDIX C — FAN PERFORMANCE 549K*05N SINGLE PHASE — 4 TON VERTICAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1048 0.12 1251 0.21 1431 0.32 1590 0.43 1735 0.56 1300 1102 0.14 1293 0.23 1467 0.34 1622 0.46 1765...
  • Page 60 APPENDIX C — FAN PERFORMANCE 549K*05N SINGLE PHASE – MEDIUM STATIC — 4 TON VERTICAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1047 1251 1431 1590 1735 1300 1101 1293 1467 1622 1765 1400 1158 1337 1505 1657 1796...
  • Page 61 APPENDIX C — FAN PERFORMANCE 549K*05N THREE PHASE — 4 TON VERTICAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1047 0.12 1252 0.21 1431 0.32 1590 0.43 1735 0.56 1300 1102 0.14 1293 0.23 1467 0.34 1622 0.46 1765...
  • Page 62 APPENDIX C — FAN PERFORMANCE 549K*05N THREE PHASE – MEDIUM STATIC — 4 TON VERTICAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1047 1251 1431 1590 1735 1300 1101 1293 1467 1622 1765 1400 1158 1337 1505 1657 1796...
  • Page 63 APPENDIX C — FAN PERFORMANCE 549K*06N SINGLE PHASE — 5 TON VERTICAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1500 1228 0.20 1394 0.29 1554 0.40 1701 0.53 1836 0.66 1625 1305 0.24 1457 0.33 1609 0.44 1750 0.57 1882...
  • Page 64 APPENDIX C — FAN PERFORMANCE 549K*06N SINGLE PHASE – MEDIUM STATIC — 5 TON VERTICAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1500 1228 1394 1554 1701 1835 1625 1305 1456 1609 1750 1881 1750 1385 1523 1666 1802 1930...
  • Page 65 APPENDIX C — FAN PERFORMANCE 549K*06N THREE PHASE — 5 TON VERTICAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1500 1228 0.20 1394 0.29 1554 0.40 1701 0.53 1836 0.66 1625 1305 0.24 1457 0.33 1609 0.44 1750 0.57 1882...
  • Page 66 APPENDIX C — FAN PERFORMANCE 549K*06N THREE PHASE – MEDIUM STATIC — 5 TON VERTICAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1500 1227 1394 1554 1701 1835 1625 1305 1456 1609 1750 1881 1750 1385 1523 1666 1802 1930...
  • Page 67 APPENDIX C — FAN PERFORMANCE 549K*04N SINGLE PHASE — 3 TON HORIZONTAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1036 0.08 1301 0.15 1517 0.24 1698 0.34 1855 0.44 1077 0.09 1331 0.16 1546 0.26 1727 0.36 1885 0.47 1050...
  • Page 68 APPENDIX C — FAN PERFORMANCE 549K*04N SINGLE PHASE – MEDIUM STATIC — 3 TON HORIZONTAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1036 1301 1517 1698 1855 1077 1331 1546 1727 1885 1050 1119 1362 1574 1755 1915 1125 1164...
  • Page 69 APPENDIX C — FAN PERFORMANCE 549K*04N THREE PHASE — 3 TON HORIZONTAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1037 0.08 1301 0.15 1517 0.24 1698 0.34 1855 0.44 1076 0.09 1330 0.16 1545 0.26 1727 0.36 1886 0.47 1050...
  • Page 70 APPENDIX C — FAN PERFORMANCE 549K*04N THREE PHASE – MEDIUM STATIC — 3 TON HORIZONTAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1037 1301 1517 1698 1855 1076 1330 1545 1727 1886 1050 1119 1361 1574 1755 1915 1125 1164...
  • Page 71 APPENDIX C — FAN PERFORMANCE 549K*05N SINGLE PHASE — 4 TON HORIZONTAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1021 0.11 1227 0.19 1417 0.30 1586 0.42 1738 0.55 1300 1073 0.13 1265 0.21 1447 0.31 1612 0.43 1762...
  • Page 72 APPENDIX C — FAN PERFORMANCE 549K*05N SINGLE PHASE – MEDIUM STATIC — 4 TON HORIZONTAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1021 1227 1417 1586 1738 1300 1073 1265 1447 1612 1762 1400 1128 1305 1479 1640 1788...
  • Page 73 APPENDIX C — FAN PERFORMANCE 549K*05N THREE PHASE — 4 TON HORIZONTAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1022 0.11 1228 0.19 1417 0.30 1586 0.42 1737 0.55 1300 1074 0.13 1265 0.21 1447 0.31 1613 0.44 1762...
  • Page 74 APPENDIX C — FAN PERFORMANCE 549K*05N THREE PHASE – MEDIUM STATIC — 4 TON HORIZONTAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1022 1228 1417 1586 1737 1300 1074 1265 1447 1613 1762 1400 1129 1306 1479 1641 1788...
  • Page 75 APPENDIX C — FAN PERFORMANCE 549K*06N SINGLE PHASE — 5 TON HORIZONTAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1500 1197 0.18 1361 0.26 1524 0.36 1679 0.49 1822 0.62 1625 1271 0.21 1421 0.29 1574 0.40 1721 0.52 1860...
  • Page 76 APPENDIX C — FAN PERFORMANCE 549K*06N SINGLE PHASE – MEDIUM STATIC — 5 TON HORIZONTAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1500 1197 1361 1524 1679 1822 1625 1271 1421 1574 1721 1860 1750 1347 1485 1627 1767 1901...
  • Page 77 APPENDIX C — FAN PERFORMANCE 549K*06N THREE PHASE — 5 TON HORIZONTAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1500 1197 0.18 1361 0.26 1524 0.36 1679 0.49 1822 0.62 1625 1271 0.21 1421 0.29 1574 0.40 1721 0.52 1860...
  • Page 78 APPENDIX C — FAN PERFORMANCE 549K*06N THREE PHASE – MEDIUM STATIC — 5 TON HORIZONTAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1500 1197 1361 1524 1679 1822 1625 1271 1421 1574 1721 1860 1750 1347 1485 1627 1767 1901...

  • Page 79: Appendix D - Wiring Diagrams

    APPENDIX D — WIRING DIAGRAMS WIRING DIAGRAMS 549K*04-06 UNITS SIZE VOLTAGE CONTROL (OVERLAY) PAGE POWER PAGE 208/230-1-60 48TC003157 04-06 48TC003160 Electro-Mechanical 208/230-3-60 48TC003156 W7220 Controller 460/575-3-60 48TC003161 48TC003158 208/230-1-60 48TC003157 04-06 48TC003160 (48TC003214) RTU Open Controller 208/230-3-60 48TC003156 (Factory Option) 460/575-3-60 48TC003161 (48TC003214) 48TC003158...
  • Page 80 APPENDIX D — WIRING DIAGRAMS...
  • Page 81 APPENDIX D — WIRING DIAGRAMS...
  • Page 82 APPENDIX D — WIRING DIAGRAMS...
  • Page 83 APPENDIX D — WIRING DIAGRAMS...
  • Page 84 APPENDIX D — WIRING DIAGRAMS Fig. F — 549K 04-06 Power Wiring Diagram — 208/230-1-60...
  • Page 85 APPENDIX D — WIRING DIAGRAMS Fig. G — 549K 04-06 Power Wiring Diagram — 208/230-3-60...
  • Page 86 APPENDIX D — WIRING DIAGRAMS Fig. H — 549K 04-06 Power Wiring Diagram — 460/575-3-60...

  • Page 87: Location

    APPENDIX E — LOW AMBIENT CONTROL SENSOR LOCATION SENSOR LOCATION SENSOR LOCATION Fig. I — 549K 04 Outdoor Circuiting Fig. J — 549K 05 Outdoor Circuiting...
  • Page 88 APPENDIX E — LOW AMBIENT CONTROL SENSOR LOCATION SENSOR LOCATION Fig. K — 549K 06 Outdoor Circuiting...
  • Page 90 Form No: SM549K-4-6-01 © 2020 Carrier Cat. No. 04-53549011-01 Edition Date: 12-2020 Printed in U.S.A. Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. Replaces:New...

  • Page 91: Start-Up Checklist

    START-UP CHECKLIST 549K 04-06 SINGLE PACKAGE ROOFTOP COOLING ONLY/ELECTRIC HEAT 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 92 Form No: SM549K-4-6-01 © 2020 Carrier Cat. No. 04-53549011-01 Edition Date: 12-2020 Printed in U.S.A. Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. CL-2 Replaces: New...

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