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Bryant Preferred 551J Service And Maintenance Instructions

Electric cooling/optional electric heat with puron (r-410a) refrigerant
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Preferred Series™
551J 17-28
Electric Cooling/Optional Electric Heat
with Puron
(R-410A) Refrigerant
®
Service and Maintenance Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . .1
UNIT ARRANGEMENT AND ACCESS . . . . . . . . . . . . . .2
Routine Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Seasonal Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Supply Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
(VFD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2-Speed Indoor Fan System . . . . . . . . . . . . . . . . . . . . . . . . .7
Identifying Factory Option . . . . . . . . . . . . . . . . . . . . . . . . . .7
CONDENSER COIL SERVICE . . . . . . . . . . . . . . . . . . . . .7
EVAPORATOR COILS . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Removing Surface Loaded Fibers . . . . . . . . . . . . . . . . . . . .9
Periodic Clean Water Rinse . . . . . . . . . . . . . . . . . . . . . . . . .9
Evaporator Coil Metering Devices. . . . . . . . . . . . . . . . . . .10
TION SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Perfect Humidity Modes . . . . . . . . . . . . . . . . . . . . . . . . . . .11
TXV Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
PURON® (R-410A) REFRIGERANT. . . . . . . . . . . . . . . .17
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Using the Cooling Charging Charts. . . . . . . . . . . . . . . . . .18
COOLING CHARGING CHARTS. . . . . . . . . . . . . . . . . .18
COMPRESSORS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
CONVENIENCE OUTLETS . . . . . . . . . . . . . . . . . . . . . . .24
Non-Powered Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Unit-Powered Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Wet in Use Convenience Outlet Cover. . . . . . . . . . . . . . . .24
Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
GFCI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Fuse On Powered Type . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Using Unit-Mounted Convenience Outlets . . . . . . . . . . . .25
Installing a Weatherproof Cover . . . . . . . . . . . . . . . . . . . .25
SMOKE DETECTORS. . . . . . . . . . . . . . . . . . . . . . . . . . . .25
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Smoke Detector Locations . . . . . . . . . . . . . . . . . . . . . . . . .26
Sensor and Controller Tests . . . . . . . . . . . . . . . . . . . . . . . .28
Detector Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53551019-01
Printed in U.S.A.
Form SM551J-17-28-02
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
PROTECTIVE DEVICES . . . . . . . . . . . . . . . . . . . . . . . . . 31
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Control Circuit, 24-V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
RTU Open Control System . . . . . . . . . . . . . . . . . . . . . . . . 32
ECONOMI$ER® SYSTEMS. . . . . . . . . . . . . . . . . . . . . . . 32
EconoMi$er IV Standard Sensors . . . . . . . . . . . . . . . . . . . 36
EconoMi$er® X (Factory Option). . . . . . . . . . . . . . . . . . . 42
PRE-START-UP/START-UP . . . . . . . . . . . . . . . . . . . . . . 55
START-UP, GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Additional Installation/Inspection . . . . . . . . . . . . . . . . . . . 55
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Outdoor-Air Inlet Screens . . . . . . . . . . . . . . . . . . . . . . . . . 55
Compressor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Refrigerant Service Ports . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Ventilation (Continuous Fan). . . . . . . . . . . . . . . . . . . . . . . 56
FASTENER TORQUE VALUES . . . . . . . . . . . . . . . . . . . 56
APPENDIX A - MODEL NUMBER
NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
APPENDIX B - PHYSICAL DATA . . . . . . . . . . . . . . . . 58
APPENDIX C - FAN PERFORMANCE . . . . . . . . . . . . 62
APPENDIX D - WIRING DIAGRAMS . . . . . . . . . . . . . 71
LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . Cl-1

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install, repair, or
service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of
cleaning coils and filters and replacing filters. All other operations
should be performed by trained service personnel. When working
on air-conditioning equipment, observe precautions in the litera-
ture, tags and labels attached to the unit, and other safety precau-
tions that may apply.
Follow all safety codes, including ANSI (American National Stan-
dards Institute) Z223.1. Wear safety glasses and work gloves. Use
quenching cloth for unbrazing operations. Have fire extinguisher
available for all brazing operations.
It is important to recognize safety information. This is the safety-
alert symbol
. When you see this symbol on the unit and in in-
structions or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices, which may result in minor personal
Pg 1
12-19
Replaces: SM551J-17-28-01

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  • Page 1: Table Of Contents

    Preferred Series™ 551J 17-28 Electric Cooling/Optional Electric Heat with Puron (R-410A) Refrigerant ® Service and Maintenance Instructions CONTENTS Indicators ........30 PROTECTIVE DEVICES .

  • Page 2: Unit Arrangement And Access

    injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, CAUTION or operation. ELECTRICAL SHOCK HAZARD Failure to follow this warning could cause personal injury or CAUTION death. PERSONAL INJURY HAZARD Before performing service or maintenance operations on the Failure to follow this caution may result in personal injury.

  • Page 3: Routine Maintenance

    • Gas burner condition • Gas manifold pressure • Heating temperature rise ECONOMIZER OR OUTSIDE AIR DAMPER • Inlet filters condition • Check damper travel (economizer) • Check gear and dampers for debris and dirt AIR FILTERS AND SCREENS Each unit is equipped with return air filters. If the unit has an econ- omizer, it will also have an outside air screen.

  • Page 4: Supply Fan Assembly

    15” X 15” SUPPLY FANS 17 1/4” DIVIDER OUTSIDE HOOD VERTICAL SUPPLY FANS CLEANABLE ALUMINUM FILTER FILTER 15” X 11” SUPPLY FAN BAROMETRIC RELIEF FILTER 18” X 15” SUPPLY FAN CLIP Fig. 3 — Inlet Air Screen Installation CAUTION ELECTRICAL SHOCK HAZARD Failure to follow this warning could cause personal injury or death.
  • Page 5 CAUTION EQUIPMENT DAMAGE HAZARD Failure to follow this CAUTION can result in premature wear and damage to equipment. Do not use a screwdriver or a pry bar to place the new V-belt in the pulley groove. This can cause stress on the V-belt and the V-BELT pulley resulting in premature wear on the V-belt and damage to the pulley.
  • Page 6 10. Remove four bolts, flat washers, lock washers and single external-tooth lock washer attaching the motor to the motor mounting plate. Discard all lock washers and exter- FAN PULLEY nal-tooth lock washer. MOVABLE 11. Lift the motor from the motor mounting plate and set FLANGE aside.

  • Page 7: 2-Speed Fan With Variable Frequency Drive

    CHANGING FAN WHEEL SPEED BY CHANGING the 2-Speed Indoor Fan Motor system will operate the fan motor speed. PULLEYS The horsepower rating of the belt is primarily dictated by the pitch Identifying Factory Option diameter of the smaller pulley in the drive system (typically the This section only applies to units that meet the criteria detailed motor pulley in these units).

  • Page 8: Recommended Condenser Coil Maintenance And Cleaning

    Recommended Condenser Coil Maintenance and non-recommended coil cleaners is strongly discouraged since coil and unit durability could be affected. Cleaning Two-Row Coils Routine cleaning of coil surfaces is essential to maintain proper operation of the unit. Elimination of contamination and removal of Clean coil as follows: harmful residues will greatly increase the life of the coil and ex- Turn off unit power and tag the disconnect.

  • Page 9: Evaporator Coils

    (18.9L) container). It is recommended that all round tube coils be cleaned as described below. Coil cleaning should be part of the unit’s regularly scheduled maintenance procedures to ensure a long life for the coil. Failure to clean the coils can result in reduced durability in the environment.

  • Page 10: Evaporator Coil Metering Devices

    Thoroughly apply Totaline environmentally sound coil the compressor and observe the frosting pattern on the face of the cleaner solution to all coil surfaces, including finned area, evaporator coil. A frost pattern should develop uniformly across tube sheets and coil headers. the face of the coil starting at each horizontal header tube.

  • Page 11: Perfect Humidity™ Adaptive Dehumidifica

    PERFECT HUMIDITY™ ADAPTIVE DEHUMIDI- side air is at a neutral temperature, but high humidity exists. This situation requires the equipment to operate at a low SHR of 0.0 to FICATION SYSTEM 0.2. With no cooling requirement calling for dehumidification, the Units with the factory-equipped Perfect Humidity option are capa- Perfect Humidity adaptive dehumidification system will energize ble of providing multiple modes of improved dehumidification as...
  • Page 12 RH2.x VALVE RH1.x VALVE PERFECT HUMIDITY CONDENSER COIL COIL OUTDOOR AIR COMPRESSOR VALVE EVAPORATOR COIL = CLOSED VALVE INDOOR AIR = OPEN VALVE = 3-WAY VALVE Fig. 15 — Normal Cooling Mode – Perfect Humidity System RH2.x VALVE RH1.x VALVE PERFECT HUMIDITY CONDENSER COIL COIL...
  • Page 13 RH2.x VALVE RH1.x VALVE PERFECT HUMIDITY CONDENSER COIL COIL OUTDOOR AIR COMPRESSOR VALVE EVAPORATOR COIL = CLOSED VALVE = OPEN VALVE INDOOR AIR = 3-WAY VALVE Fig. 17 — Hot Gas Reheat Mode (Reheat 2) – Perfect Humidity System Table 2 — Perfect Humidity Reheat Control Board I/O CONNECTION POINT NAME TYPE...
  • Page 14 Table 3 — Inputs/Modes/Outputs Summary HUM/ MODE COMP 1 COMP 2 LSV1 LSV2 DSV1 DSV2 LTLO Normal ON=G ON=R Normal Cool1 ON=Y1 ON=G ON=R Normal Cool2 ON=Y2 ON=G ON=R Normal Heat 1 ON=G ON=R Reheat Dehumidify ON=G ON=R ON=R Subcool Cool1 and Cool2/ Cir1/Reheat ON=G...

  • Page 15: Thermostatic Expansion Valve (Txv)

    Table 4 — Perfect Humidity Troubleshooting (cont) PROBLEM CAUSE REMEDY Check using Cool→Reheat1 Valve Test (Service Test → HMZR → RHV.A or RHV.B) using ComfortLink Scrolling Marquee. Check MBB relay output. No 24V signal to input terminals Check wiring. RDV Valve Operation Check transformer and circuit breaker or fuses.

  • Page 16: Refrigerant System Pressure Access Ports

    CAPILLARY TUBE DIAPHRAGM PUSHRODS FEEDER TUBES INLET COIL OUTLET NEEDLE VALVE SPRING DISTRIBUTOR BULB EXTERNAL EQUALIZER TUBE Fig. 18 — Thermostatic Expansion Valve (TXV) Operation Install the new TXV; avoid damage to the tubing or the CAPILLARY TUBE EQUALIZER TUBE valve when attaching the TXV to the distributor.

  • Page 17: Puron® (R-410A) Refrigerant

    CLAMP TXV SENSOR TXV SENSOR BULBS BULB CIRCUIT 2 SENSOR BULBS (CIRCUIT 2) CIRCUIT 1 (CIRCUIT 1) Fig. 20 — TXV Sensor Bulb Locations PURON (R-410A) REFRIGERANT ® tion line while the compressor is operating. If adding refrigerant into the suction line, use a commercial metering/expansion device This unit is designed for use with Puron (R-410A) refrigerant.

  • Page 18: Using The Cooling Charging Charts

    gage to the service port on the suction line. Mount the temperature If the leaving temperature is low, carefully recover some of the sensing device on the suction line and insulate it so the outdoor charge. Recheck the compressor discharge pressure as the charge ambient temperature does not affect the reading.
  • Page 19 Fig. 22 — Cooling Charging Chart - 17.5 Ton...
  • Page 20 Fig. 23 — Cooling Charging Chart - 20 Ton...
  • Page 21 Fig. 24 — Cooling Charging Chart - 25 Ton...

  • Page 22: Compressors

    COMPRESSORS COMPRESSOR ROTATION On 3-phase units with scroll compressors, it is important to be Lubrication certain the compressor is rotating in the proper direction. To de- The compressor is charged with the correct amount of oil at the termine whether or not the compressor is rotating in the proper factory.

  • Page 23: Troubleshooting The Cooling System

    TROUBLESHOOTING THE COOLING SYSTEM Table 5 — Cooling Service Troubleshooting PROBLEM CAUSE REMEDY Power failure. Call power company. Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker. Defective thermostat, contactor, transformer, or Replace defective component. Compressor and Condenser control relay.

  • Page 24: Convenience Outlets

    CONVENIENCE OUTLETS WARNING ELECTRICAL OPERATION HAZARD Failure to follow this warning could result in personal injury or death. Units with convenience outlet circuits may use multiple disconnects. Check convenience outlet for power status before opening unit for service. Locate its disconnect switch, if appropriate, and open it.

  • Page 25: Gfci Maintenance

    breaker is open. Other connection methods will result in the con- GFCI RECEPTACLE venience outlet circuit being de-energized when the unit discon- NOT INCLUDED COVER - WHILE-IN-USE nect or circuit breaker is open. See Fig. 27. WEATHERPROOF GFCI Maintenance Periodically test the GFCI receptacle by pressing the TEST button on the face of the receptacle.

  • Page 26: Sensor

    Duct Smoke Sensor Duct Smoke Sensor Controller Exhaust Tube Exhaust Gasket Sensor Housing Conduit Nuts and Electronics (supplied by installer) See Detail A Intake Conduit Support Plate Gasket Controller Housing Terminal Block Cover and Electronics Cover Gasket (ordering option) TSD-CO2 Conduit Couplings Controller Cover (ordering option)

  • Page 27: Fiop Smoke Detector Wiring And Response

    RETURN AIR WITHOUT ECONOMIZER HIGHLIGHT C The sampling tube is located across the return air opening on the 24-v power signal using the ORN lead is removed at the Smoke unit basepan. See Fig. 32. The holes in the sampling tube face Detector input on the Central Terminal board (CTB);...

  • Page 28: Sensor And Controller Tests

    48TM502525 Fig. 34 — Typical Smoke Detector System Wiring Sensor and Controller Tests DIRTY CONTROLLER TEST The dirty controller test checks the controller’s ability to initiate a SENSOR ALARM TEST dirty sensor test and indicate its results. The sensor alarm test checks a sensor’s ability to signal an alarm state.

  • Page 29: Detector Cleaning

    IMPORTANT: Failure to follow this NOTICE may result in an unnecessary evacuation of the facility. SMOKE DETECTOR Changing the dirty sensor test operation will put the detec- CONTROLLER tor into the alarm state and activate all automatic alarm − responses. Before changing dirty sensor test operation, dis- AUXILIARY connect all auxiliary equipment from the controller and EQUIPMENT...

  • Page 30: Indicators

    Squeeze the retainer clips on both sides of the optic hous- • The contacts on the controller’s alarm initiation relay ing, then lift the housing away from the printed circuit close. board. • The controller’s remote alarm LED output is activated Gently remove dirt and debris from around the optic plate (turned on).

  • Page 31: Protective Devices

    Resetting Alarm and Trouble Condition Trips: HIGH PRESSURE SWITCH Manual reset is required to restore smoke detector systems to Nor- The system is provided with a high pressure switch mounted on mal operation. For installations using two sensors, the duct smoke the discharge line.

  • Page 32: Control Circuit, 24-V

    airflow rate increases). Motor overload conditions typically devel- WIRING HARNESS op when the unit is operated with an access panel removed, with unfinished duct work, in an economizer-open mode, or a leak de- velops in the duct system that allows a bypass back to unit return OUTSIDE AIR opening.
  • Page 33 Fig. 41 — RTU Open Overlay for Economizer Wiring...
  • Page 34 Fig. 42 — VFD Overlay for W2770 Controller Wiring...
  • Page 35 FOR OCCUPANCY CONTROL REPLACE JUMPER WITH FIELD-SUPPLIED TIME CLOCK LEGEND Potentiometer Defaults Settings: Power ExhaustMiddle — Demand Controlled Ventilation Minimum Pos.Fully Closed DCV Max.Middle — Indoor Air Quality DCV SetMiddle — Low Ambient Lockout Device EnthalpyC Setting — Outdoor Air Temperature NOTES: —...

  • Page 36: Economi$Er Iv Standard Sensors

    An outdoor-air temperature is used to determine when the EconoMi$er IV simulator program is available from Bryant to EconoMi$er IV system can be used for free cooling. The sensor is help with EconoMi$er IV training and troubleshooting.
  • Page 37 SUPPLY AIR TEMPERATURE (SAT) SENSOR can be added to allow for different types of changeover control and operation of the EconoMi$er IV and unit. The supply air temperature sensor is a 3 K thermistor located at the inlet of the indoor fan. (See Fig. 46.) This sensor is factory in- Table 10 —...
  • Page 38 (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 39 control, turn the enthalpy setpoint potentiometer fully clockwise to Adjust the minimum position potentiometer to allow the mini- the D setting. mum amount of outdoor air, as required by local codes, to enter the building. Make minimum position adjustments with at least INDOOR AIR QUALITY (IAQ) SENSOR INPUT 10°F temperature difference between the outdoor and return-air The IAQ input can be used for demand controlled ventilation con-...
  • Page 40 Fig. 54 — CO Sensor = Mixed-Air Temperature Use setting 1 or 2 for Bryant equipment. See Table 11. Once base ventilation has been determined, set the minimum Press Clear and Mode buttons. Hold at least 5 seconds damper position potentiometer to the correct position.
  • Page 41 The custom settings of the CO sensor can be changed any time Set the enthalpy potentiometer to D (fully CW). The Free after the sensor is energized. Follow the steps below to change the Cool LED should turn off. non-standard settings: Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.

  • Page 42: Economi$Er® X (Factory Option)

    Disconnect power at TR and TR1. S-Bus Enthalpy Control Sensors Set enthalpy potentiometer to previous setting. The sensor is a combination temperature and humidity sensor Set DCV maximum position potentiometer to previous which is powered by and communicates on the S-Bus. Up to three setting.
  • Page 43 OUTPUTS Table 12 — Economizer Module Actuator Signal (Left Hand Terminal Blocks) 2 to 10 vdc; minimum actuator impedance is 2k ohm; bus two- wire output for bus communicating actuators. LABEL TYPE DESCRIPTION Exhaust fan, Y1, Y2 and AUX1 O Top Left Terminal Block 20k NTC Mixed Air Temperature Sensor (Polarity...
  • Page 44 SENSOR (HOT) BLACK YELLOW ANALOG BROWN – ORANGE GREEN POWER SUPPLY. PROVIDE DISCONNECT Switch MEANS AND OVERLOAD PROTECTION AS REQUIRED. Label Fig. 58 — CO Sensor Wiring INTERFACE OVERVIEW This section describes how to use the EconoMi$er ® X user inter- Switches face for: •...
  • Page 45 Press the ▲ button to increase (change) the displayed • CHECKOUT parameter value. • ALARMS Press the ▼ button to decrease (change) the displayed NOTE: Some parameters in the menus use the letters MA or parameter value. MAT, indicating a mixed air temperature sensor location before NOTE: When values are displayed, pressing and holding the the cooling coil.
  • Page 46 Table 16 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † RETURN AIR TEMPERATURE Displays measured value of return air temperature from RAT _ _ . _ °F 0°F to 140°F RA TEMP Sylk Bus sensor.
  • Page 47 Table 16 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † DCV MAXIMUM DAMPER POSITION Displays only if a CO sensor is connected. 2 to 10 vdc Used for Vbz (ventilation max cfm) set point. VENTMAX is the same setting as MIN POS would be if unit did not have CO sensor.
  • Page 48 Table 16 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † FREEZE PROTECTION DAMPER POSITION FREEZE POS CLO or MIN Damper position when freeze protection is active (closed or MIN POS).
  • Page 49 Table 16 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † SENSOR ERROR sensor has failed, gone out of range or become CO2 SENS ERR disconnected - check wiring then replace sensor if the alarm continues.
  • Page 50 Table 17 — Damper Minimum Position Settings and Readings on Checkout Menu DEMAND CONTROLLED VENTILATION FAN SPEED SETPOINTS CHECKOUT SENSOR) MIN POS VMAX–HS MIN POS H VMAX–HS MIN POS L VMAX–LS VENT MIN VMAX–HS VENT MAX VMAX–HS VENT MIN H VMAX–HS VENT MAX H VMAX–LS...
  • Page 51 Table 20 — Enthalpy Operation without 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 MIN POS Closed High 24-v/On 0-v/Off MIN POS Closed High 24-v/On...
  • Page 52 Table 23 — Dry Bulb Operation with DCV (CO Sensor) — 2 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I Y1-O Y2-O OCCUPIED UNOCCUPIED SPEED VENTILATION (DCV) ECONOMIZE 0v/Off 0v/Off VENTMIN Closed 24v/On 0v/Off VENTMIN Closed HIGH 24v/On 24v/On VENTMIN Closed...
  • Page 53 Table 25 — Enthalpy Operation with DCV (CO Sensor) — 2 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I Y1-O Y2-O OCCUPIED UNOCCUPIED SPEED VENTILATION (DCV) ECONOMIZE 0v/Off 0v/Off VENTMIN Closed 24v/On 0v/Off VENTMIN Closed HIGH 24v/On 24v/On VENTMIN Closed 0v/Off...
  • Page 54 ECONOMIZING DUAL ENTHALPY AVAILABLE HIGH LIMIT NOT AVAILABLE SINGLE ENTHALPY P2 (T,RH) (T,RH) TEMPERATURE Fig. 60 — Single Enthalpy Curve Boundaries Table 27 — Single Enthalpy and Dual Enthalpy High Limit Curves POINT P1 POINT P2 ENTHALPY TEMP. DRY TEMP. ENTHALPY HUMIDITY HUMIDITY...

  • Page 55: Pre-Start-Up/Start-Up

    You can also navigate to the Alarms menu at any time. Read and follow instructions on all WARNING, CAU- TION, and INFORMATION labels attached to, or shipped Clearing Alarms with, unit. Once the alarm has been identified and the cause has been re- Make the following inspections: moved (e.g.

  • Page 56: Refrigerant Service Ports

    Refrigerant Service Ports fan switch at AUTO. position. Adjust thermostat to a setting be- low room temperature. Compressor starts on closure of contactor. Each unit system has two -in. SAE flare (with check valves) Check unit charge. Refer to Refrigerant Charge section. service ports: one on the suction line, and one on the compressor discharge line.

  • Page 57: Nomenclature

    F = Medium STatic, High Efficiency Motor, Horizontal G = High Static, High Efficiency Motor, Horizontal Not all possible options can be displayed above - see price pages or contact your Bryant Sales representative for more details Fig. A — Model Number Nomenclature Table A —...

  • Page 58: Appendix B - Physical Data

    APPENDIX B — PHYSICAL DATA Table B — PHYSICAL DATA (Cooling) 15 to 17.5 Tons 551J*17D 551J*17K 551J*20D 551J*20K Refrigeration System # Circuits/# Comp./Type 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll R-410A charge A/B (lbs) 17/16.4 24.5/25.7...
  • Page 59 APPENDIX B — PHYSICAL DATA Table B — PHYSICAL DATA (Cooling) 15 to 17.5 Tons (cont) 551J*17D 551J*17K 551J*20D 551J*20K Evaporator fan and motor (cont) HORIZONTAL Motor qty/Belt qty/Driver type 1 / 1 /Belt 1 / 1 /Belt 1 / 1 /Belt 1 / 1 /Belt Nominal nameplate H.P.
  • Page 60 APPENDIX B — PHYSICAL DATA Table C — PHYSICAL DATA (Cooling) 20 to 25 Tons 551J*24D 551J*24K 551J*28D 551J*28K Refrigeration System # Circuits/# Comp./Type 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll R-410A charge A/B (lbs) 23.8/23.1 30.0/30.7...
  • Page 61 APPENDIX B — PHYSICAL DATA Table C — PHYSICAL DATA (Cooling) 20 to 25 Tons (cont) 551J*24D 551J*24K 551J*28D 551J*28K Evaporator fan and motor (cont) HORIZONTAL Motor qty/Belt qty/Driver type — — 1 / 1 /Belt 1 / 1 /Belt Nominal nameplate H.P.

  • Page 62: Appendix C - Fan Performance

    For information on the electrical properties of Bryant motors, please see the electrical information section of this book. For more information on the performance limits of Bryant motors, see the application data section of this book.
  • Page 63 APPENDIX C — FAN PERFORMANCE Table D — 551J*17 Horizontal Supply (15 Ton) AVAILABLE EXTERNAL STATIC PRESSURE (IN. WG) 1.04 1.51 2.03 2.59 3.19 4500 1.26 1.76 2.30 2.89 3.51 4900 1.48 2.00 2.57 3.18 3.82 5250 1.76 2.30 2.90 3.54 4.21 5650...
  • Page 64 APPENDIX C — FAN PERFORMANCE Table F — 551J*20 Horizontal Supply (17.5 Ton) AVAILABLE EXTERNAL STATIC PRESSURE (IN. WG) 1.48 2.00 2.57 3.18 3.82 5250 1.80 2.35 2.95 3.58 4.26 5700 2.16 2.74 3.37 4.04 4.75 6150 2.54 3.14 3.80 4.50 5.23 6550...
  • Page 65 APPENDIX C — FAN PERFORMANCE Table G — 551J*20 Vertical Supply (17.5 Ton) AVAILABLE EXTERNAL STATIC PRESSURE (IN. WG) 0.85 1.16 1.51 1.88 2.27 5250 1.03 1.35 1.72 2.11 2.53 5700 1.25 1.58 1.96 2.37 2.81 6150 1.46 1.81 2.20 2.63 3.08 6550...
  • Page 66 APPENDIX C — FAN PERFORMANCE Table H — 551J*24 Horizontal Supply (20 Ton) AVAILABLE EXTERNAL STATIC PRESSURE (IN. WG) 2.51 3.02 3.56 6000 1.54 2.01 2.90 3.45 4.02 6500 1.87 2.37 2.79 3.35 3.93 4.53 7000 2.25 3.25 3.85 4.46 5.09 7500 2.68...
  • Page 67 APPENDIX C — FAN PERFORMANCE Table I — 551J*24 Vertical Supply (20 Ton) AVAILABLE EXTERNAL STATIC PRESSURE (IN. WG) 0.84 1.20 1.53 1.86 2.19 6000 1.00 1.39 1.76 2.12 2.48 6500 1.17 1.61 2.01 2.40 2.78 7000 1.35 1.85 2.29 2.70 3.12 7500...
  • Page 68 APPENDIX C — FAN PERFORMANCE Table J — 551J*28 Horizontal Supply (25 Ton) AVAILABLE EXTERNAL STATIC PRESSURE (IN. WG) 2.68 3.25 3.85 4.46 5.09 7500 3.17 3.78 4.41 5.05 5.72 8000 3.73 4.36 5.02 5.70 6.40 8500 4.34 5.01 5.71 6.42 7.15 9000...
  • Page 69 APPENDIX C — FAN PERFORMANCE Table K — 551J*28 Vertical Supply (25 Ton) AVAILABLE EXTERNAL STATIC PRESSURE (IN. WG) 1.85 2.29 2.70 3.12 7500 1.35 2.19 2.68 3.14 3.60 8150 1.62 2.54 3.08 3.59 4.08 8750 1.89 2.96 3.56 4.12 4.65 9400 2.20...
  • Page 70 APPENDIX C — FAN PERFORMANCE Table L — Fan RPM at Motor Pulley Settings – Vertical Configuration MOTOR PULLEY TURNS OPEN MOTOR/DRIVE UNIT COMBO Standard Static 3 phase Medium Static High Static 1009 Standard Static 3 phase Medium Static High Static 1078 1058 1039...

  • Page 71: Appendix D - Wiring Diagrams

    APPENDIX D — WIRING DIAGRAMS Table N — Wiring Diagrams DUAL CIRCUIT PERFECT HUMIDITY SIZE VOLTAGE CONTROL POWER CONTROL POWER 208/230-3-60 50HE502048-C (page 74) 50HE502363-D (page 79) 460-3-60 50HE502357-F (page 77) 50HE502359-D (page 80) 50HE502045-C (page 75) 575-3-60 50HE502361-D (page 81) 208/230-3-60 50HE502048-C (page 74) 50HE502363-D (page 79)
  • Page 72 APPENDIX D — WIRING DIAGRAMS Fig. B — 551J Control Diagram — Sizes 17-24 (208/230-3-60, 460/575-3-60); 28 (460/575-3-60)
  • Page 73 APPENDIX D — WIRING DIAGRAMS Fig. C — 551J Control Diagram for Size 28 (208/230-3-60)
  • Page 74 APPENDIX D — WIRING DIAGRAMS Fig. D — 551J 17-24 Power Diagram (208/230-3-60)
  • Page 75 APPENDIX D — WIRING DIAGRAMS Fig. E — 551J 17-28 Power Diagram (460/575-3-60)
  • Page 76 APPENDIX D — WIRING DIAGRAMS Fig. F — 551J 28 Power Diagram (208/230-3-60)
  • Page 77 APPENDIX D — WIRING DIAGRAMS Fig. G — 551J Control Diagram with Perfect Humidity System – Sizes 17-24 (208/230-3-60, 460/575-3-60), 28 (460/575-3-60)
  • Page 78 APPENDIX D — WIRING DIAGRAMS Fig. H — 551J 28 Control Diagram with Perfect Humidity System (208/230-3-60)
  • Page 79 APPENDIX D — WIRING DIAGRAMS Fig. I — 551J 17-24 Power Diagram with Perfect Humidity System (208/230-3-60)
  • Page 80 APPENDIX D — WIRING DIAGRAMS Fig. J — 551J 17-28 Power Diagram with Perfect Humidity System (460-3-60)
  • Page 81 APPENDIX D — WIRING DIAGRAMS Fig. K — 551J 17-28 Power Diagram with Perfect Humidity System (575-3-60)
  • Page 82 APPENDIX D — WIRING DIAGRAMS Fig. L — 551J 28 Power Diagram with Perfect Humidity System (208/230-3-60)
  • Page 83 APPENDIX D — WIRING DIAGRAMS Fig. M — 551J RTU-Open Wiring Diagram...
  • Page 84 APPENDIX D — WIRING DIAGRAMS Fig. N — 551J 2-Speed Indoor Fan Motor/VFD System Control Wiring Diagram...

  • Page 85: Appendix E - Motormaster Sensor

    APPENDIX E — MOTORMASTER SENSOR LOCATIONS SENSOR LOCATION Fig. O — Motormaster Sensor Locations – Sizes 17, 20, 24 SENSOR LOCATION Fig. P — Motormaster Sensor Location – Sizes 28...
  • Page 86 © 2019 Bryant Heating & Cooling Systems Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53551019-01 Printed in U.S.A. Form SM551J-17-28-02 Pg 86 12-19 Replaces: SM551J-17-28-01...
  • Page 87 UNIT START-UP CHECKLIST (Remove and Store in Job File) NOTE: To avoid injury to personnel and damage to equipment or property when com- pleting 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 88 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) _____ REPEAT PROCESS FOR 2 COMPRESSOR SYSTEMS. © 2019 Bryant Heating & Cooling Systems Cat. No. 04-53551019-01 Edition Date: 12-19 Printed in U.S.A.

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