Bryant 551B Series Installation, Start-Up And Service Instructions Manual
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Bryant 551B Series Installation, Start-Up And Service Instructions Manual

Bryant 551B Series Installation, Start-Up And Service Instructions Manual

Single package rooftop electric cooling units
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IMPORTANT - READ BEFORE INSTALLING
1. Read and become familiar with these installation in-
structions before installing this unit. (See Fig. 1.)
2. Be sure the installation conforms to all applicable local
and national codes.
3. These instructions contain important information for the
proper maintenance and repair of this equipment. Re-
tain these instructions for future use.
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-17
I. Locate the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
II. Unit Duct Connections . . . . . . . . . . . . . . . . . . . . . . 3
III. Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 3
IV. Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 5
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-29
I. Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . 17
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . 29
I. Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-32
I. Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
II. Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
III. Condenser Fan Adjustment . . . . . . . . . . . . . . . . . 30
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
V. Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . 31
VI. Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . 31
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . 33-35
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1

SAFETY CONSIDERATIONS

Recognize safety information. This is the safety-alert sym-
bol (
). 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, and
CAUTION. These words are used with the safety-alert sym-
bol. Danger identifies the most serious hazards which will
result in severe personal injury or death. Warning indicates
a condition that could result in personal injury. Caution is
used to identify unsafe practices which would result in minor
personal injury or product and property damage.
WARNING: Before performing service or mainte-
nance operations on unit, turn off main power switch
to unit. Electrical shock could cause personal injury.
installation, start-up and
service instructions
SINGLE PACKAGE ROOFTOP
ELECTRIC COOLING UNITS
Page
Cancels: II 551A-36-1
Fig. 1 - Typical Unit
1. The power supply (volts, hertz, and phase) must corre-
spond to that specified on unit rating plate.
2. The electrical supply provided by the utility must be suf-
ficient to handle load imposed by this unit.
3. Refer to Locate the Unit section on page 3 and Fig. 2 for
locations of electrical inlets, condensate drain, duct con-
nections, and required clearances before setting unit in
place.
4. This installation must conform with local building codes
and with NEC (National Electrical Code) or NFPA
(National Fire Protection Association) 54 TIA-54-84-1.
Refer to Provincial and local plumbing or wastewater
codes and other applicable local codes.
5. Approved for outdoor installation on wood flooring or on
class A, B, or C roof covering materials.

INSTALLATION

Unit is shipped in the vertical airflow configuration (see
Fig. 1). To convert to horizontal discharge, remove horizontal
duct opening covers. Using the same screws, install covers
on duct openings in basepan of unit with the insulation side
down. Seals around duct openings must be tight.
All units can be connected into existing duct systems that are
properly sized and designed to handle an airflow of 300 to
500 cfm per each 12,000 Btuh of rated cooling capacity.
NOTE: When installing any accessory item, see the manu-
facturer's installation instructions packaged with the acces-
sory. A qualified installer or agency must use only factory-
authorized kits or accessories when modifying this unit.
551B
Sizes 036-072
3 to 6 Tons
II 551B-36-1
2/1/95

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  • Page 1: Table Of Contents

    installation, start-up and 551B service instructions Sizes 036-072 3 to 6 Tons SINGLE PACKAGE ROOFTOP ELECTRIC COOLING UNITS Cancels: II 551A-36-1 II 551B-36-1 2/1/95 IMPORTANT — READ BEFORE INSTALLING 1. Read and become familiar with these installation in- structions before installing this unit. (See Fig. 1.) 2.
  • Page 2 VARISLIDE™ STD. UNIT WEIGHT CORNER WEIGHT (A) CORNER WEIGHT (B) CORNER WEIGHT (C) CORNER WEIGHT (D) ECONOMIZER WEIGHT UNIT 551B036 15.4 56.2 48.1 43.1 49.9 551B048 15.4 57.6 49.0 44.0 51.3 551B060 15.4 60.3 51.3 45.8 53.5 551B072 15.4 67.6 57.6 50.8 59.9...

  • Page 3: Locate The Unit

    as shown in Fig. 4. Improperly applied gasket can also result I. LOCATE THE UNIT in air leaks and poor unit performance. A. Clearance Curb should be level. Unit leveling tolerances are shown in Maintain clearance around and above unit to provide mini- Fig.
  • Page 4 NOTES: SERVICE PLATE SIZES 1. Roof curb accessory is shipped unassembled. 2. Insulated panels. UNIT SIZE ‘‘D’’ Alt Connector Package ‘‘B’’ ‘‘C’’ ‘‘F’’ Power ‘‘G’’ Control 3. Dimensions in [ ] are in millimeters. Drain Hole Accessory 4. Roof curb: galvanized steel. ⁄...

  • Page 5: Field Connections

    MAXIMUM ALLOWABLE DIFFERENCE (in.) Fig. 5 — Unit Leveling Tolerances NOTES: DIMENSIONS OPERATING 1. Dimension in ( ) is in millimeters. UNIT WEIGHT ‘‘A’’ ‘‘B’’ ‘‘C’’ 2. Hook rigging shackles through holes in base rail, as shown in de- 551B tail ‘‘A.’’...
  • Page 6 Table 1 — Specifications BASE UNIT 551B NOMINAL CAPACITY (tons) OPERATING WEIGHT (lb) Unit With Varislide™ Economizer With PARABLADE Economizer Roof Curb COMPRESSOR Scroll Quantity Oil (oz) REFRIGERANT TYPE R-22 Operating Charge (lb-oz) 10-0 9-10 CONDENSER FAN Propeller Type Qty...Diameter (in.) 1...22.0 1...22.0 1...22.0...
  • Page 7 NOTE: Drain plug is shown in factory-installed position. Fig. 7 — Condensate Drain Connection Fig. 9 — Location of Coil Area Not to be Drilled minimum installation standards for heating and air con- ditioning systems. Secure all ducts to building structure.
  • Page 8 3. Use only copper or copper-clad conductor for connec- NOTE: If accessory thru-the-bottom connections are used, re- tions between field-supplied electrical disconnect switch fer to the thru-the-bottom accessory installation instructions and unit. The use of aluminum wire is not recom- for information on wiring the unit.
  • Page 9 460-3-60 (SIZES 036-048) 208/230-3-60 460-3-60 (SIZE 060 AND 072) 575-3-60 (SIZE 060 AND 072) 208/230-3-60 (SIZES 036-048) 208/230-1-60 (SIZES 036-060) LEGEND — Contactor Field Wiring COMP — Compressor Field Wiring EQUIP — Equipment — Ground Splice Connection — Indoor (Evaporator) (Factory Supplied) Fan Contactor 575-3-60...
  • Page 10 Table 2A — Electrical Data (Units Without Electrical Convenience Outlet) VOLTAGE ELECTRIC MINIMUM UNIT NOMINAL COMPRESSOR OFM IFM POWER SUPPLY UNIT RANGE HEAT* DISCONNECT SIZE VOLTAGE 551B (V-Ph-Hz) Min Max FLA Nominal kW† MOCP — — 25.6/25.6 35/35** 25/25 3.3/ 4.4 15.9/18.3 26.0/29.0 35/35**...
  • Page 11 Table 2B — Electrical Data (Units With Electrical Convenience Outlet) VOLTAGE ELECTRIC POWER SUPPLY MINIMUM UNIT NOMINAL COMPRESSOR OFM IFM UNIT RANGE HEAT* WITH OUTLET DISCONNECT SIZE VOLTAGE 551B (V-Ph-Hz) Min Max FLA Nominal kW† MOCP — — 31.6/31.6 40/40** 30/30 3.3/ 4.4 15.9/18.3...
  • Page 12 LEGEND % Voltage Imbalance max voltage deviation from average voltage — Canadian Underwriters’ Laboratories = 100 x — Full Load Amps average voltage HACR — Heating, Air Conditioning and Refrigeration — Indoor (Evaporator) Fan Motor Example: Supply voltage is 460-3-60. —...
  • Page 13 12. Connect OAT per Fig. 19. F. Factory-Installed Convenience Outlet The optional electrical outlet provides 115-v from the unit for 13. Slide outdoor-air inlet screen into screen track on hood power driven tools and other equipment. Outlet provided with side plate. While holding screen in place, fasten screen a factory-installed fuse.
  • Page 14 ECONOMIZER CONTROL BOARD WIRING HARNESS BAROMETRIC RELIEF DAMPER ECONOMIZER MOTOR Fig. 16 — Horizontal Varislide Economizer Installation Fig. 14 — Outdoor-Air Hood Details Example: Given — Negative Pressure ......0.2 in. wg Outdoor Air .
  • Page 15 LEGEND OAT — Outdoor-Air Thermostat NOTE: See unit wiring diagram for more details. Fig. 19 — Wiring Connections for Outdoor-Air Thermostat Fig. 20 — Varislide™ Economizer Barometric Relief Damper Characteristics c. Connect T and T1 to the 24 V power supply. d.
  • Page 16 7. Determine the enthalpy changeover set point from Fig. 22. The enthalpy changeover set point should be set to return the outdoor air damper to the minimum position when enthlapy rises above the set point. The settings are A, B, C, and D. Set the enthalpy change- over per the setting in Fig.

  • Page 17: Pre-Start-Up

    3. Make the following inspections: a. Inspect for shipping and handling damages such as broken lines, loose parts, disconnected wires, etc. b. Inspect for oil at all refrigerant tubing connections and on unit base. Detecting oil generally indicates a refrigerant leak. Leak-test all refrigerant tubing con- nections using electronic leak detector, halide torch, or liquid-soap solution.

  • Page 18: Heating Section Start-Up And Adjustments

    II. HEATING SECTION START-UP AND ADJUSTMENTS F. Airflow and Temperature Rise The heating operation airflow must produce a temperature CAUTION: Complete the required procedures given rise that falls within the approved cfm range (300 to 500 cfm in Pre-Start-Up section on this page before starting unit. per 12,000 Btuh cooling).
  • Page 19 and the 24 vac terminal. This causes the damper to modu- C. Unit Controls late closed until the supply-air temperature rises above 55 F All compressors have the following internal-protection or the damper reaches the minimum position. controls: When the supply-air temperature is between 55 F and 57 F, 1.

  • Page 20: Indoor Airflow And Airflow Adjustments

    IV. INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS CAUTION: For cooling operation, the recommended airflow is 300 to 500 cfm per each 12,000 Btuh of rated cooling capacity. For heating operation, the airflow must produce a temperature rise that falls within the range stamped on the unit rating plate.
  • Page 21 Table 5 — Evaporator-Fan Motor Data MAXIMUM MAXIMUM UNIT UNIT UNIT CONTINUOUS 551B PHASE VOLTAGE BHP* DRAW Single 1.20 208/230 208/230 Three 1.20 Single 1.20 208/230 208/230 Three 1.20 Single 1.80 208/230 208/230 Three 1.80 208/230 Three 2.40 LEGEND Bhp — Brake Horsepower *Extensive motor and electrical testing on these units ensures that the full horsepower range of the motors can be utilized with confidence.
  • Page 22 Table 7 — 551B048 Air Delivery — Vertical Discharge Units BELT-DRIVE MOTOR External Static Pressure (in. wg) AIRFLOW (Cfm) 1200 0.16 0.21 0.27 0.32 0.44 0.50 0.56 1300 0.20 0.25 0.31 0.37 0.50 0.56 0.62 1400 0.24 0.30 0.36 0.42 0.55 0.62 0.69...
  • Page 23 Table 8 — 551B060 Air Delivery — Vertical Discharge Units BELT-DRIVE MOTOR External Static Pressure (in. wg) AIRFLOW (Cfm) 1500 0.33 0.39 0.51 0.64 1052 0.78 1600 0.39 0.45 0.58 1004 0.73 1087 0.88 1700 0.46 0.53 0.66 1030 0.80 1112 0.96 1800...
  • Page 24 Table 9 — 551B072 Air Delivery — Vertical Discharge Units BELT-DRIVE MOTOR External Static Pressure (in. wg) AIRFLOW (Cfm) 1800 0.55 0.62 1002 0.78 1084 0.93 1163 1.10 1900 0.64 0.72 1037 0.88 1119 1.04 1194 1.21 2000 0.74 0.82 1072 0.98 1154...
  • Page 25 Table 10 — 551B036 Air Delivery — Horizontal Discharge Units BELT-DRIVE MOTOR External Static Pressure (in. wg) AIRFLOW (Cfm) 0.06 0.08 0.12 0.22 0.25 0.27 1000 0.09 0.13 0.19 0.26 0.29 0.31 1100 0.13 0.16 0.23 0.29 0.32 0.35 1200 0.16 0.23 0.28...
  • Page 26 Table 11 — 551B048 Air Delivery — Horizontal Discharge Units DIRECT-DRIVE MOTOR External Static Pressure (in. wg) AIRFLOW (Cfm) 1200 0.15 0.20 0.25 0.30 0.42 0.49 0.55 1300 0.18 0.23 0.29 0.35 0.47 0.54 0.60 1400 0.21 0.27 0.33 0.39 0.52 0.59 0.66...
  • Page 27 Table 12 — 551B060 Air Delivery — Horizontal Discharge Units BELT-DRIVE MOTOR External Static Pressure (in. wg) AIRFLOW (Cfm) 1500 0.31 0.35 0.47 0.60 1026 0.74 1600 0.36 0.40 0.53 0.66 1049 0.81 1700 0.40 0.47 0.60 0.75 1077 0.89 1800 0.45 0.51...
  • Page 28 Table 13 — 551B072 Air Delivery — Horizontal Discharge Units BELT-DRIVE MOTOR External Static Pressure (in. wg) AIRFLOW (Cfm) 1800 0.45 0.51 0.65 1019 0.81 1099 0.96 1900 0.45 0.58 0.73 1046 0.90 1126 1.06 2000 0.60 0.66 0.82 1073 0.99 1154 1.16...

  • Page 29: Care And Maintenance

    B. Ventilation Sequence I. AIR FILTER If unit is equipped with economizer or accessory two-position CAUTION: Never operate the unit without a suit- damper, the damper will open to the minimum position when- able air filter in the return-air duct system. Always re- ever the evaporator fan runs.

  • Page 30: Lubrication

    4. Remove device holding coil sections together at hairpin end of condenser coil. Carefully separate the outer coil section 3 to 4 in. from the inner coil section. See Fig. 30. 5. Use a water hose or other suitable equipment to flush down between the 2 coil sections to remove dirt and de- bris.

  • Page 31: Refrigerant Charge

    suction temperature should be. If suction temperature is high, V. REFRIGERANT CHARGE add refrigerant. If suction temperature is low, carefully re- Amount of refrigerant charge is listed on unit nameplate (also claim some of the charge. Recheck the suction pressure as refer to Table 1).
  • Page 32 Fig. 35 — Cooling Chart Chart, 551B072 Fig. 34 — Cooling Charging Chart, 551B060 —32—...

  • Page 33: Troubleshooting

    TROUBLESHOOTING Table 14 — Cooling Troubleshooting PROBLEM CAUSE REMEDY Compressor and Power failure. Call power company. condenser fan Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker. will not start. Defective thermostat, contactor, transformer, Replace component. or control relay. Insufficient line voltage.
  • Page 34 Table 15 — Varislide™ Economizer Troubleshooting PROBLEM CAUSE REMEDY Damper does not Indoor (evaporator) fan 1. Check to ensure that 24 vac is present at terminal C1 on the IFC or that open. is off. 24 vac is present at the IFO terminal. Check whether 24 vac is present at PL6-1 (red wire) and/or PL6-3 (black wire).
  • Page 35 Table 16 — PARABLADE Economizer Troubleshooting PROBLEM CAUSE REMEDY Damper does not open. Evaporator fan not on. Check wiring between G on connection board and indoor fan contactor. No power to economizer motor. 1. Disconnect power at TR and TR1. Disconnect jumper across P and P1. 2.
  • Page 36 PACKAGED SERVICE TRAINING Our packaged service training programs provide an excellent way to increase your knowledge of the equipment discussed in this manual. Product programs cover: • Unit Familiarization • Maintenance • Installation Overview • Operating Sequence A large selection of product, theory, and skills programs is available. All programs include a video cassette and/or slides and a companion booklet.

  • Page 40: Start-Up Checklist

    START-UP CHECKLIST (Remove and Store in Job File) I. PRELIMINARY INFORMATION MODEL NO.: SERIAL NO.: DATE: TECHNICIAN: II. PRE-START-UP (insert checkmark in box as each item is completed) VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS CHECK THAT INDOOR AIR FILTER IS CLEAN AND IN PLACE VERIFY THAT UNIT INSTALLATION IS LEVEL CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW...

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