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Bryant 551K 04N Series Service And Maintenance Instructions

Single package rooftop cooling only/electric heat unit with puron (r-410a) refrigerant 3 to 5 nominal tons
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551K 04-06
Single Package Rooftop Cooling Only/Electric Heat Unit
®
with Puron
(R-410A) Refrigerant
3 to 5 Nominal Tons
Service and Maintenance Instructions
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Condenser Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TXV Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Replacing TXV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Refrigerant System Pressure Access Ports . . . . . . . . . . . . 11
PURON (R-410A) REFRIGERANT . . . . . . . . . . . . . . . . . 12
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
COOLING CHARGING CHARTS . . . . . . . . . . . . . . . . . 12
COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Replacing Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Condenser-Fan Adjustment . . . . . . . . . . . . . . . . . . . . . . . . 14
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
ELECTRIC HEATERS . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Completing Heater Installation . . . . . . . . . . . . . . . . . . . . . 19
SMOKE DETECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Smoke Detector Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Smoke Detector Locations . . . . . . . . . . . . . . . . . . . . . . . . . 20
Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SENSOR AND CONTROLLER TESTS . . . . . . . . . . . . . 23
Sensor Alarm Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53551012-01
Printed in U.S.A.
Form SM551K-4-6-01
Controller Alarm Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Dirty Controller Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Dirty Sensor Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Changing the Dirt Sensor Test . . . . . . . . . . . . . . . . . . . . . 23
Remote Station Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
SD-TRK4 Remote Alarm Test Procedure . . . . . . . . . . . . 23
Dirty Sensor Test Using an SD-TRK4 . . . . . . . . . . . . . . . 24
Detector Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
PROTECTIVE DEVICES . . . . . . . . . . . . . . . . . . . . . . . . . 25
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Relief Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Control Circuit, 24-V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
RTU OPEN CONTROL SYSTEM . . . . . . . . . . . . . . . . . . 26
Sensory/Accessory Installation . . . . . . . . . . . . . . . . . . . . . 27
ECONOMIZER SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . 27
EconoMi$er2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Economi$er X (Factory Option) . . . . . . . . . . . . . . . . . . . . 36
PRE-START-UP/START-UP . . . . . . . . . . . . . . . . . . . . . . 48
START-UP, GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Additional Installation/Inspection . . . . . . . . . . . . . . . . . . 48
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Outdoor-Air Inlet Screens . . . . . . . . . . . . . . . . . . . . . . . . . 48
Compressor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Refrigerant Service Ports . . . . . . . . . . . . . . . . . . . . . . . . . 48
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Ventilation (Continuous Fan) . . . . . . . . . . . . . . . . . . . . . . 49
FASTENER TORQUE VALUES . . . . . . . . . . . . . . . . . . . 49
START-UP, RTU OPEN CONTROLS . . . . . . . . . . . . . . 49
APPENDIX A - MODEL NUMBER
NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
APPENDIX B - PHYSICAL DATA . . . . . . . . . . . . . . . . 51
APPENDIX C - FAN PERFORMANCE . . . . . . . . . . . . 53
APPENDIX D - WIRING DIAGRAMS . . . . . . . . . . . . . 78
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . CL-1
Pg 1
10-19
Replaces: New

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Summary of Contents for Bryant 551K 04N Series

  • Page 1: Table Of Contents

    551K 04-06 Single Package Rooftop Cooling Only/Electric Heat Unit ® with Puron (R-410A) Refrigerant 3 to 5 Nominal Tons Service and Maintenance Instructions SAFETY CONSIDERATIONS ..... . 2 Controller Alarm Test .

  • Page 2: Safety Considerations

    SAFETY CONSIDERATIONS Installation and servicing of air-conditioning equipment can be WARNING hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, re- UNIT OPERATION AND SAFETY HAZARD 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 Electric Heating • Inspect power wire connections General • Ensure fuses are operational Figures 1 and 2 show general unit arrangement and access • Ensure manual reset limit switch is closed locations. Economizer or Outside Air Damper FILTER ACCESS PANEL •...

  • Page 4: Supply Fan (Blower) Section

    Supply Fan (Direct-Drive) All 551K units have the Axion™ Fan direct drive vane axial 17 1/4” 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. Check the job specifications for the CFM (cubic feet per minute) and ESP (external static pressure) required. Using the chart on the Fan Speed Set Up labels (see Fig.
  • Page 6 ESP in. wg Factory Setting: Calculator 7.8 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 Fig. 10 — Fan Assembly Removal Fig. 9 — Supply Fan Control Wiring Diagram 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 rotor is replaced as well.

  • Page 8: Staged Air Volume

    Line up rectangle key way in the center of stator with rect- angle feature on motor and set stator onto motor. Install four #10-32 x -in. hex head machine screws (P/N: AD07AB126) to connect aluminum stator to motor. Tighten to 23 in.-lbs (2.6 Nm). Fit grommet on motor wire harness into keyhole feature on the side of the stator and pull wire harness out through grommet.

  • Page 9: Condenser Coil

    Condenser Coil TOP PANEL The condenser coil is fabricated with round tube copper hair- REMOVE pins and plate fins of various materials and/or coatings (see REMOVE SCREWS SCREWS FROM ALL SIDES Model Number Nomenclature in Appendix A to identify the OF TOP PANEL materials provided in this unit).

  • Page 10: Evaporator Coil

    CAUTION COIL CLIPS UNIT DAMAGE HAZARD Failure to follow this caution may result in accelerated cor- rosion of unit parts. Harsh chemicals, household bleach or acid or basic clean- ers should not be used to clean outdoor or indoor coils of any kind.

  • Page 11: Thermostatic Expansion Valve (Txv)

    THERMOSTATIC EXPANSION VALVE (TXV) coil has a brazed connection, use a file or a tubing cutter to remove the mechanical flare nut from the equalizer line. All 551K units have a factory-installed nonadjustable thermo- Then use a new coupling to braze the equalizer line to the static expansion valve (TXV).

  • Page 12: Puron (R-410A) Refrigerant

    Refrigerant Charge Amount of refrigerant charge is listed on the unit’s nameplate. Refer to Bryant 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 -6.7...
  • Page 13 5 Ton Mid-Tier CHARGING CHART 4 Ton Mid-Tier CHARGING CHART (Unit must run on high stage compressors and (Unit must run on high stage compressors and outdoor fan on high speed) outdoor fan on high speed) °C °F °C °F 59.9 59.9 Add charge if Above Curve...

  • Page 14: 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 15 NO SCREW (Blank Tab) Fig. 27 — Condenser-Fan Assembly — Screw Pattern Sequence...

  • Page 16: Troubleshooting Cooling System

    Troubleshooting Cooling System Refer to Table 3 for additional troubleshooting topics. Table 3 — 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 Press the gasket over the screw heads. Slip the backing 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 18: Duty Cycle

    the unit against over-temperature situations. All 551K Model electric heaters are one module containing either one or two banks of electric heat coils. Heater modules are installed in the compartment below the in- door (supply) fan outlet. Access is through the indoor access panel.

  • Page 19: Completing Heater Installation

    SINGLE POINT BOXES AND SUPPLEMENTARY FUSES When the unit MOCP device value exceeds 60A, unit-mounted supplementary fuses are required for each heater circuit. These fuses are included in accessory single point boxes, with power STATOR MANUAL RESET LIMIT distribution and fuse blocks. The single point box will be in- SWITCH stalled directly under the unit control box, just to the left of the partition separating the indoor section (with electric heaters)

  • Page 20: Smoke Detectors

    SMOKE DETECTORS Smoke detectors are available as factory-installed options on 551K models. Smoke detectors may be specified for supply air only, for return air without or with economizer, or in combina- tion of supply air and return air. Return air smoke detectors are arranged for vertical return configurations only.

  • Page 21: Completing Installation Of Return Air Smoke

    RETURN AIR SMOKE DETECTOR SENSOR WITH ECONOMIZER The sampling tube is inserted through the side plates of the SUPPLY AIR SMOKE DETECTOR economizer housing, placing it across the return air opening on the unit basepan. See Fig. 41. The holes in the sampling tube face downward, into the return air stream.

  • Page 22: Fiop Smoke Detector Wiring And Response

    Rotate the detector plate so the sensor is facing outwards FIOP Smoke Detector Wiring and Response and the sampling tube connection is on the bottom. See ALL UNITS Fig. 43. The FIOP smoke detector is configured to automatically shut down all unit operations when a smoke condition is detected. RETURN AIR SMOKE DETECTOR (Operating Position Shown) See Fig.

  • Page 23: Sensor And Controller Tests

    SENSOR AND CONTROLLER TESTS IMPORTANT: Failure to follow this ALERT can result in Sensor Alarm Test an unnecessary evacuation of the facility. The sensor alarm test checks a sensor’s ability to signal an Holding the test magnet against the sensor housing for more alarm state.

  • Page 24: Remote Test/Reset Station Dirty Sensor Test

    Remote Test/Reset Station Dirty Sensor Test Disconnect power from the duct detector then remove the sensor’s cover. See Fig. 46. The test/reset station dirty sensor test checks the test/reset sta- tion’s ability to initiate a sensor dirty test and indicate the re- sults.

  • Page 25: Troubleshooting

    An internal sensor fault is detected upon entering the trouble state: SENSOR’S TROUBLE LED IS ON • The contacts on the controller’s supervisory relay switch Check the sensor’s Dirty LED. If it is flashing, the sensor positions. (See Fig. 47.) is dirty and must be cleaned.

  • Page 26: Relief Device

    The RTU Open controller is an integrated component of the protection device. This device resets automatically. Do not by- Bryant rooftop unit. Its internal application programming pro- pass this switch to correct trouble. Determine the cause and vides optimum performance and energy efficiency. RTU Open correct it.

  • Page 27: Sensory/Accessory Installation

    Sensory/Accessory Installation OUTSIDE AIR TEMPERATURE SENSOR IMPORTANT: Refer to the specific sensor or accessory ECONOMI$ER X instructions for its proper installation and for rooftop unit HARNESS installation refer to base unit installation instructions and the unit’s wiring diagrams. There are a variety of sensors and accessories available for the RTU Open.

  • Page 28: 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. 52 for wiring information. BLACK TRANSFORMER GROUND BLUE 500 OHM RESISTOR VIOLET PINK...

  • Page 29: Economi$Er Iv (Field-Installed Accessory)

    EconoMi$er IV (Field-Installed Accessory) IMPORTANT: For 551K rooftop units EconoMi$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 is shown in Fig. 53. Typical settings, sensor ranges, and jumper positions are also shown.
  • Page 30 Table 6 — EconoMi$er IV Input/Output Logic INPUTS OUTPUTS Demand Enthalpy* Compressor N Terminal† Controlled Ventilation Outdoor Return Stage 1 Stage 2 Occupied Unoccupied (DCV) High (Free Cooling Minimum position Closed LED Off) Below set (DCV LED Off) Modulating** (between Modulating** (between min.
  • Page 31 Table 7 — Supply Air Sensor Temperature/Resistance DIP SWITCH CHANGEOVER Values POSITION TEMPERATURE TEMPERATURE (f) RESISTANCE (ohms) 48°F 220,250 100,000 1 2 3 53,010 29,091 53°F 16,500 1 2 3 9,795 5,970 55°F 3,747 1 2 3 3,000 2,416 58°F 1,597 1,080 1 2 3...
  • Page 32 HORIZONTAL ECONOMIZER BAROMETRIC RELIEF FLOW VERTICAL ECONOMIZER BAROMETRIC RELIEF FLOW 2500 2500 Horizontal Economizers Vertical Economizers 2000 2000 1500 1500 3-5 Ton 3-5 Ton 1000 1000 0.05 0.15 0.25 0.05 0.15 0.25 RETURN DUCT STATIC PRESSURE (in. wg) RETURN DUCT STATIC PRESSURE (in. wg) HORIZONTAL ECONOMIZER RETURN AIR PRESSURE DROP VERTICAL ECONOMIZER RETURN AIR PRESSURE DROP 6000...
  • Page 33 Exhaust Set Point Adjustment (29) (32) (35) (38) (41) (43) The exhaust set point will determine when the exhaust fan runs based on damper position (if accessory power exhaust is in- CONTROL CONTROL POINT CURVE APPROX. deg. F (deg. C) stalled).
  • Page 34 When the timeclock contacts are open (removing Use setting 1 or 2 for Bryant equipment. the 24-v signal from terminal N), the EconoMi$er IV will be in Press Clear and Mode buttons. Hold at least 5 seconds unoccupied mode.
  • Page 35 If connected, remove sensor from terminals SO and +. DCV MINIMUM AND MAXIMUM POSITION Connect 1.2 kilo-ohm 4074EJM checkout resistor across To check the DCV minimum and maximum position: terminals SO and +. Make sure EconoMi$er IV preparation procedure has been Put 620-ohm resistor across terminals SR and +.

  • Page 36: 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 37 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 38 Table 9 — Economizer Module - Right Hand Terminal Table 10 — 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 39 • Press the ▼ (Down arrow) button to move to the next 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 currently displayed menu.
  • Page 40 Table 12 — 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 41 Table 12 — 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 42 Table 12 — 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 43 Table 12 — 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 44 Table 12 — 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 45 Enthalpy Settings point are all below the selected boundary, the economizer sets the economizing 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 46 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 551K units. minimum position for the fan speed.
  • Page 47 2SP H/C and 3 Speed Fan Operation To perform a Checkout test: FAN TYPE = 2SP H/C and FAN TYPE = 3SPEED are not Scroll to the desired test in the Checkout menu using the used on 551K units. ▲ and ▼ buttons. Press the (Enter) button to select the item.

  • Page 48: Pre-Start-Up/Start-Up

    PRE-START-UP/START-UP c. Inspect all field-wiring and factory-wiring connec- tions. Be sure that connections are completed and tight. Be sure that wires are not in contact with refrig- WARNING erant tubing or sharp edges. d. Inspect coil fins. If damaged during shipping and han- PERSONAL INJURY HAZARD dling, carefully straighten fins with a fin comb.

  • Page 49: Compressor Rotation

    Compressor Rotation Heating To start unit, turn on main power supply. Set system selector switch to the HEAT position and set thermostat at a setting CAUTION above room temperature. Set fan to AUTO position. First stage of thermostat energizes the first stage of the electric EQUIPMENT DAMAGE HAZARD heaters.

  • Page 50: Nomenclature

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

  • Page 51: Appendix B - Physical Data

    APPENDIX B — PHYSICAL DATA 551K UNIT 551K*04N 551K*04R 551K*05N 551K*05R 551K*06N 551K*06R NOMINAL TONS BASE UNIT OPERATING WT (lb) 551K* REFRIGERATION SYSTEM No. Circuits/No. Compressors/Type 1 / 1/ 2-Stage Scroll Puron ® (R-410A) charge A/B (lbs-oz) — 8-11 — 11-0 —...
  • Page 52 APPENDIX B — PHYSICAL DATA 551K UNIT (CONT) 551K*04N 551K*04R 551K*05N 551K*05R 551K*06N 551K*06R CONDENSER FAN AND MOTOR Qty / Motor Drive Type 1 / Direct Motor HP/RPM / 825/675 / 1100/900 Fan Diameter (in.) FILTERS RA Filter Qty / Size (in.) 2 / 16x25x2 4 / 16x16x2 OA Inlet Screen Qty / Size (in.)

  • Page 53: 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 54 APPENDIX C — FAN PERFORMANCE 551K*04 SINGLE PHASE — 3 TON VERTICAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1060 0.08 1325 0.16 1541 0.25 1718 0.35 1870 0.46 1103 0.09 1356 0.17 1572 0.27 1752 0.37 1906 0.48 1050...
  • Page 55 APPENDIX C — FAN PERFORMANCE 551K*04 SINGLE PHASE – MEDIUM STATIC — 3 TON VERTICAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1060 1325 1541 1718 1870 1103 1356 1572 1752 1906 1050 1149 1388 1602 1784 1941 1125 1198...
  • Page 56 APPENDIX C — FAN PERFORMANCE 551K*04 THREE PHASE — 3 TON VERTICAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1060 0.08 1325 0.16 1541 0.25 1718 0.35 1870 0.46 1103 0.09 1356 0.17 1572 0.27 1752 0.37 1906 0.48 1050...
  • Page 57 APPENDIX C — FAN PERFORMANCE 551K*04 THREE PHASE – MEDIUM STATIC — 3 TON VERTICAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1060 1325 1541 1718 1870 1103 1356 1572 1752 1906 1050 1149 1388 1602 1784 1941 1125 1198...
  • Page 58 APPENDIX C — FAN PERFORMANCE 551K*05 SINGLE PHASE — 4 TON VERTICAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1121 0.15 1327 0.25 1507 0.37 1667 0.50 1814 0.65 1300 1179 0.18 1375 0.28 1549 0.40 1705 0.54 1849...
  • Page 59 APPENDIX C — FAN PERFORMANCE 551K*05 SINGLE PHASE – MEDIUM STATIC — 4 TON VERTICAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1121 1327 1507 1667 1814 1300 1179 1375 1549 1705 1849 1400 1239 1425 1593 1746 1886...
  • Page 60 APPENDIX C — FAN PERFORMANCE 551K*05 THREE PHASE — 4 TON VERTICAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1120 0.15 1327 0.25 1506 0.37 1667 0.50 1814 0.65 1300 1178 0.18 1375 0.28 1549 0.40 1705 0.54 1849...
  • Page 61 APPENDIX C — FAN PERFORMANCE 551K*05 THREE PHASE – MEDIUM STATIC — 4 TON VERTICAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1120 1327 1506 1667 1814 1300 1178 1375 1549 1705 1849 1400 1238 1424 1593 1745 1886...
  • Page 62 APPENDIX C — FAN PERFORMANCE 551K*06 SINGLE PHASE — 5 TON VERTICAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1500 1228 0.20 1394 0.29 1555 0.40 1701 0.53 1836 0.66 1625 1305 0.24 1457 0.33 1609 0.44 1751 0.57 1882...
  • Page 63 APPENDIX C — FAN PERFORMANCE 551K*06 SINGLE PHASE – MEDIUM STATIC — 3 TON VERTICAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1500 1228 1394 1555 1701 1836 1625 1305 1457 1609 1751 1882 1750 1384 1523 1666 1803 1930...
  • Page 64 APPENDIX C — FAN PERFORMANCE 551K*06 THREE PHASE — 5 TON VERTICAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1500 1228 0.20 1394 0.29 1555 0.40 1701 0.53 1836 0.66 1625 1305 0.24 1457 0.33 1609 0.44 1751 0.57 1882...
  • Page 65 APPENDIX C — FAN PERFORMANCE 551K*06 THREE PHASE – MEDIUM STATIC — 5 TON VERTICAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1500 1228 1394 1555 1701 1836 1625 1305 1457 1609 1751 1882 1750 1384 1523 1666 1803 1930...
  • Page 66 APPENDIX C — FAN PERFORMANCE 551K*04 SINGLE PHASE — 3 TON HORIZONTAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1037 0.08 1301 0.15 1517 0.24 1697 0.34 1855 0.44 1076 0.09 1331 0.16 1545 0.26 1727 0.36 1885 0.47 1050...
  • Page 67 APPENDIX C — FAN PERFORMANCE 551K*04 SINGLE PHASE – MEDIUM STATIC — 3 TON HORIZONTAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1037 1301 1517 1697 1855 1076 1331 1545 1727 1885 1050 1119 1362 1573 1755 1915 1125 1164...
  • Page 68 APPENDIX C — FAN PERFORMANCE 551K*04 THREE PHASE — 3 TON HORIZONTAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1037 0.08 1301 0.15 1517 0.24 1697 0.34 1855 0.44 1076 0.09 1331 0.16 1545 0.26 1727 0.36 1885 0.47 1050...
  • Page 69 APPENDIX C — FAN PERFORMANCE 551K*04 THREE PHASE – MEDIUM STATIC — 3 TON HORIZONTAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1037 1301 1517 1697 1855 1076 1331 1545 1727 1885 1050 1119 1362 1573 1755 1915 1125 1164...
  • Page 70 APPENDIX C — FAN PERFORMANCE 551K*05 SINGLE PHASE — 4 TON HORIZONTAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1092 0.14 1306 0.24 1497 0.35 1667 0.49 1819 0.64 1300 1148 0.16 1348 0.26 1533 0.38 1700 0.52 1851...
  • Page 71 APPENDIX C — FAN PERFORMANCE 551K*05 SINGLE PHASE – MEDIUM STATIC — 4 TON HORIZONTAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1092 1306 1497 1667 1819 1300 1148 1348 1533 1700 1851 1400 1207 1394 1571 1734 1882...
  • Page 72 APPENDIX C — FAN PERFORMANCE 551K*05 THREE PHASE — 4 TON HORIZONTAL SUPPLY (RPM - BHP) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1092 0.14 1306 0.24 1497 0.35 1667 0.49 1819 0.64 1300 1148 0.16 1348 0.26 1533 0.38 1700 0.52 1851...
  • Page 73 APPENDIX C — FAN PERFORMANCE 551K*05 THREE PHASE – MEDIUM STATIC — 4 TON HORIZONTAL SUPPLY (RPM - VDC) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1200 1092 1306 1497 1667 1819 1300 1148 1348 1533 1700 1851 1400 1207 1394 1571 1734 1882...
  • Page 74 APPENDIX C — FAN PERFORMANCE 551K*06 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 75 APPENDIX C — FAN PERFORMANCE 551K*06 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 1348 1486 1627 1767 1901...
  • Page 76 APPENDIX C — FAN PERFORMANCE 551K*06 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 77 APPENDIX C — FAN PERFORMANCE 551K*06 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 1348 1486 1627 1767 1901...

  • Page 78: Appendix D - Wiring Diagrams

    APPENDIX D — WIRING DIAGRAMS WIRING DIAGRAMS 551K*04-06 UNITS SIZE VOLTAGE CONTROL (OVERLAY) PAGE POWER PAGE 208/230-1-60 48TC002964 48TC002957 04-06 Electro-Mechanical 208/230-3-60 48TC002954 48TC002789 W7220 Standard Controller 460/575-3-60 48TC002960 48TC002958 208/230-1-60 48TC002964 (48TC002984) 48TC002957 04-06 RTU Open Controller 208/230-3-60 48TC002954 (48TC002984) 48TC002789 (Factory Option) 460/575-3-60...
  • Page 79 APPENDIX D — WIRING DIAGRAMS Fig. B — 551K*04-06 Electro-Mechanical Control Wiring Diagram — 208/230-1-60 (with W7220 Control)
  • Page 80 APPENDIX D — WIRING DIAGRAMS Fig. C — 551K*04-06 Electro-Mechanical Control Wiring Diagram — 208/230-3-60 (with W7220 Control)
  • Page 81 APPENDIX D — WIRING DIAGRAMS Fig. D — 551K*04-06 Electro-Mechanical Control Wiring Diagram — 460/575-3-60 (with W7220 Control)
  • Page 82 APPENDIX D — WIRING DIAGRAMS Fig. E — 551K*04-06 208/230-1-60 Unit with RTU Open Controller...
  • Page 83 APPENDIX D — WIRING DIAGRAMS Fig. F — 551K*04-06 208/230-3-60 Unit with RTU Open Controller...
  • Page 84 APPENDIX D — WIRING DIAGRAMS Fig. G — 551K*04-06 460/575-3-60 Unit with RTU Open Controller...
  • Page 85 APPENDIX D — WIRING DIAGRAMS Fig. H — 551K*04-06 Power Wiring Diagram — 208/230-1-60...
  • Page 86 APPENDIX D — WIRING DIAGRAMS Fig. I — 551K*04-06 Power Wiring Diagram — 208/230-3-60...
  • Page 87 APPENDIX D — WIRING DIAGRAMS Fig. J — 551K*04-06 Power Wiring Diagram — 460/575-3-60...

  • Page 88: Appendix E - Low Ambient Control Sensor

    APPENDIX E — LOW AMBIENT CONTROL SENSOR LOCATION SENSOR LOCATION Fig. K — 551K*04 Outdoor Circuiting SENSOR LOCATION Fig. M — 551K*06 Outdoor Circuiting SENSOR LOCATION Fig. L — 551K*05 Outdoor Circuiting...
  • Page 90 Copyright 2019 Bryant Heating & Cooling Systems Cat. No. 04-53551012-01 Edition Date: 10-19 Printed in U.S.A. Form No: SM551K-4-6-01 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 551K*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 judg- ment, follow safe practices, and adhere to the safety considerations/information as outlined in preceding sections of this Service and Maintenance Instruction document.
  • Page 92 4. With unit in dehumid mode switch to heating and verify compressor and outdoor fan stop (Y/N) _____ 5. Turn off heating, cooling, and reheat, restore set points for thermostat and humidistat (Y/N) _____ Copyright 2019 Bryant Heating & Cooling Systems Cat. No. 04-53551012-01 Edition Date: 10-19 Printed in U.S.A.

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