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Bryant 551B Installation Instructions Manual

Single-package rooftop electric cooling units with optional electric heat
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551B 036- -072
551C 024- -060
SINGLE- - PACKAGE ROOFTOP ELECTRIC COOLING
UNITS WITH OPTIONAL ELECTRIC HEAT

TABLE OF CONTENTS

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Installation Instructions
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SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components.
1
Only trained and qualified service personnel should install, repair,
1
or service air-conditioning equipment.
2
Untrained personnel can perform basic maintenance functions of
cleaning coils and filters and replacing filters. All other operations
2
should be performed by trained service personnel. When working
2
on air-conditioning equipment, observe precautions in the
2
literature, tags and labels attached to the unit, and other safety
precautions that may apply.
2
Follow all safety codes. Wear safety glasses and work gloves. Use
2
quenching cloth for unbrazing operations. Have fire extinguishers
2
available for all brazing operations.
4
Recognize safety information. This is the safety- -alert symbol
8
. When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
8
Understand the signal words DANGER, WARNING, and
8
CAUTION. These words are used with the safety- -alert symbol.
8
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies a hazard
22
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
22
injury or product and property damage. NOTE is used to
22
highlight suggestions which will result in enhanced installation,
reliability,or operation.
22
22
!
24
ELECTRICAL SHOCK HAZARD
25
Failure to follow this warning could cause personal
26
injury or death.
31
Before performing service or maintenance operations
48
on unit, turn off main power switch to unit and install
48
lockout tag. Ensure electrical service to rooftop unit
agrees with voltage and amperage listed on the unit
50
rating plate.
57
61
Unit is shipped in the vertical discharge configuration. To convert
to horizontal discharge application, remove duct opening covers.
Using the same screws, install covers on duct openings in
basepan of unit with insulation-side down. Seals around
openings must be tight. (See Fig. 1.)
1
WARNING

INSTALLATION

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  • Page 1: Table Of Contents

    551B 036- -072 551C 024- -060 SINGLE- - PACKAGE ROOFTOP ELECTRIC COOLING UNITS WITH OPTIONAL ELECTRIC HEAT Installation Instructions TABLE OF CONTENTS SAFETY CONSIDERATIONS ......

  • Page 2: Step 1 -Provide Unit Support

    Step 1 —Provide Unit Support Roof Curb Assemble and install accessory roof curb in accordance with instructions shipped with curb. (See Fig. 2.) Install insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb, not to the unit. If electric control power or gas service is to be routed through the basepan, attach the accessory thru-the-bottom service connections to the basepan in accordance...
  • Page 3 ˝ [31.7] [19] NPT Fig. 2 --- Roof Curb Details ROOF CURB UNIT ACCESSORY SIZE 1˝-2˝ CRRFCURB001A01 551B 036-072 [356] 2˝-0˝ 551C 024-060 CRRFCURB002A01 [610] NOTES: 1. Roof curb accessory is shipped disassembled. 2. Insulated panels. 3. Dimensions in [ ] are in millimeters.

  • Page 4: Positioning

    MAXIMUM ALLOWABLE DIFFERENCE (in.) Fig. 3 --- Unit Leveling Tolerances CONDENSATE PAN (SIDE VIEW) HORIZONTAL DRAIN PLUG DRAIN OUTLET NOTE: Drain plug is shown in factory-installed position. Fig. 4 --- Condensate Drain Connection Positioning Maintain clearance around and above unit to provide minimum distance from combustible materials, proper airflow, and service access.
  • Page 5 5. Weights include base unit without the Perfect Humidityt adaptive dehumidification system. See Table 1 for unit operating weights with the Perfect Humidityt system. OPERATING OPERATING UNIT UNIT WEIGHT 551C 551C OPERATING OPERATING UNIT UNIT WEIGHT 551B 551B Fig. 7 --- Roof Curb Alignment Fig. 6 --- Rigging Details DIMENSIONS “A” “B” 73.69 1872 35.50 73.69 1872 35.50 73.69 1872 35.50...

  • Page 8: Step 5 -Make Electrical Connections

    3 and 4, Note 2, to determine the percentage of voltage imbalance. Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation invalidates any applicable Bryant warranty. NOTE: If accessory thru-the-bottom connections and roof curb are used, refer to the Thru-the-Bottom Accessory Installation Instructions for information on wiring the unit.
  • Page 9 Reset (Auto.) FREEZE PROTECTION THERMOSTAT Opens (F) Closes (F) OUTDOOR-AIR INLET SCREENS RETURN-AIR FILTERS Quantity...Size (in.) LEGEND Bhp — Brake Horsepower *Single phase/three phase. Table 1—Physical Data 551B Acutrol™ Metering Device 10-2 12-5 18-8 1...22 1...22 3500 3500 /8...825 /8...825 3/8 ---in.
  • Page 10 Movable Pulley Flange (rpm) Movable Pulley Maximum Full Movable Pulley Maximum Full Turns from Closed Position Factory Setting — Full Turns Open Factory Speed Setting (rpm) Fan Shaft Diameter at Pulley (in.) HIGH-PRESSURE SWITCH (psig) Standard Compressor Internal Relief Cutout Reset (Auto.) LOSS-OF-CHARGE/LOW-PRESSURE...
  • Page 11 575-3-60 (SIZES 060 AND 072) 208/230-3-60 (SIZES 036 AND 048) LEGEND — Contactor COMP — Compressor — Indoor (Evaporator) Fan Contactor — National Electrical Code — Terminal Block LOW VOLTAGE INTEGRATED GAS UNIT CONNECTIONS CONTROLLER (IGC) Fig. 12 --- Field Control Wiring Raceway...

  • Page 22: Step 6 -Adjust Factory-Installed Options

    Perfect Humidity™ Adaptive Dehumidification System Perfect Humidity system operation can be controlled by field installation of a Bryant- -approved humidistat. (See Fig. 13.) NOTE: A light commercial Thermidistat™ device (Fig. 14) can be used instead of the humidistat if desired. The Thermidistat device includes a thermostat and a humidistat.
  • Page 23 LEGEND — Circuit Breaker — Cooling Relay — Dehumidify Relay — Discharge Solenoid Valve — Heater Relay — Low Pressure Switch — Liquid Solenoid Valve LTLO — Low Temperature Lockout Field Splice Fig. 15 --- Typical Perfect Humidityt Adaptive Dehumidification System DEHUM TS TAT WIRES LEGEND...

  • Page 24: Optional Economi$Er

    Fig. 19 --- Outdoor- -Air Damper With Hood Attached Fig. 20 --- Outdoor- -Air Damper Position Setting ECONOMI$ER IV CONTROLLER OUTSIDE AIR WIRING TEMPERATURE SENSOR HARNESS LOW AMBIENT SENSOR ACTUATOR Fig. 21 --- EconoMi$er IV Component Locations Optional EconoMi$er IV See Fig.

  • Page 25: Economi$Er Iv Standard Sensors

    40_ to 100_F. Supply Air Temperature (SAT) Sensor The supply air temperature sensor is a 3k ohm thermistor located at the inlet of the indoor fan. (See Fig. 32.) This sensor is factory HOOD BOX BRACKET installed. The operating range of temperature measurement is 0°...

  • Page 26: Economi$Er Iv Control Modes

    EconoMi$er IV Control Modes Determine the EconoMi$er IV control mode before set up of the control. Some modes of operation may require different sensors. (See Table 6.) The EconoMi$er IV is supplied from the factory with a supply- -air temperature sensor and an outdoor- - air temperature sensor.
  • Page 27 Outdoor Enthalpy Changeover For enthalpy control, accessory enthalpy sensor (part number HH57AC078) is required. Replace the standard outdoor dry bulb temperature sensor with the accessory enthalpy sensor in the same mounting location. (See Fig. 21.) When the outdoor air enthalpy rises above the outdoor enthalpy changeover set point, the outdoor-air damper moves to its minimum position.
  • Page 28 The EconoMi$er IV control works with conventional thermostats that have a Y1 (cool stage 1), Y2 (cool stage 2), W1 (heat stage 1), W2 (heat stage 2), and G (fan). The EconoMi$er IV control does not support space temperature sensors. Connections are made at the thermostat terminal connection board located in the main control box.
  • Page 29 LED ON LED ON LED OFF LED ON LED OFF LED OFF DEGREES FAHRENHEIT Fig. 34 --- Outside Air Temperature Changeover Set Points CONTROL CONTROL POINT CURVE APPROX. deg. F (deg. C) AT 50% RH 73 (23) 70 (21) 67 (19) 63 (17) APPROXIMATE DRY BULB TEMPERATURE--degrees F (degrees C) Occupancy Control...
  • Page 30 DAMPER VOLTAGE FOR MAX VENTILATION RATE Fig. 38 --- CO sensor. For example, Use setting 1 or 2 for Bryant equipment. (See Table 7.) 1. Press Clear and Mode buttons. Hold at least 5 seconds until the sensor enters the Edit mode.

  • Page 31: Step 7 - Adjust Evaporator-Fan Speed

    Adjust evaporator-fan speed to meet jobsite conditions. Tables 8 and 9 show fan rpm at motor pulley settings for the 551C 024- -060 and 551B 036- -072 units. Tables 10 and 13 show maximum amp draw of belt-drive motor. Table 12 shows sound data.
  • Page 32 0.15 0.05 1000 Fig. 39 --- Perfect Humidityt Adaptive Dehumidification System Static Pressure Drop (in. wg) Fig. 40 --- Belt Drive Motor Mounting Table 8—551B, 551C Fan Rpm at Motor Pulley Setting With Standard Motor* UNIT 551B 551B 551C 1044...
  • Page 33 *Extensive motor and electrical testing on these units ensures that the full horsepower and watts range of the motors can be utilized with confidence. Using the fan motors up to the ratings shown in this table will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
  • Page 34 2. Extensive motor and electrical testing on these units ensures that the full range of the motor can be utilized with confidence. Using the fan motors up to the ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
  • Page 35 Table 15—Fan Performance 551B 036, 551C 036 — Vertical Discharge Units; Standard Motor AIRFLOW AIRFLOW Watts 0.14 1000 0.17 1100 0.21 1200 0.25 1300 0.30 1400 0.36 1500 0.42 AIRFLOW AIRFLOW Watts 1029 0.63 1095 1000 1052 0.70 1118 1100 1076 0.77...
  • Page 36 Table 17—Fan Performance 551B 048, 551C 048 — Vertical Discharge Units; Standard Motor AIRFLOW AIRFLOW Watts 1200 0.25 1300 0.30 1400 0.36 1500 0.42 1600 0.49 1700 0.57 1800 0.65 1900 0.75 1014 2000 0.86 1050 AIRFLOW AIRFLOW Watts 1200 1100 0.85...
  • Page 37 Table 19—Fan Performance 551B 060, 551C 060 Single-Phase — Vertical Discharge Units; Standard Motor (Belt Drive)* AIRFLOW AIRFLOW Watts 1500 0.40 1600 0.46 1700 0.54 1800 0.62 1001 1900 0.71 1037 2000 0.81 1073 2100 1023 0.92 1110 2200 1063 1.05...
  • Page 38 Table 20—Fan Performance 551B 060, 551C 060 Three-Phase — Vertical Discharge Units; Standard Motor (Belt Drive)* AIRFLOW AIRFLOW Watts 1500 0.40 1600 0.46 1700 0.54 1800 0.62 1001 1900 0.71 1037 2000 0.81 1073 2100 1023 0.92 1110 2200 1063 1.05...
  • Page 39 Table 21—Fan Performance 551B 060, 551C 060 — Vertical Discharge Units; High-Static Motor AIRFLOW AIRFLOW Watts 1500 0.40 1600 0.46 1700 0.54 1800 0.62 1001 1900 0.71 1037 2000 0.81 1073 2100 1023 0.92 1110 2200 1063 1.05 1147 2300 1104 1.18...
  • Page 40 Table 22—Fan Performance 551B 072 — Vertical Discharge Units; Standard Motor (Belt Drive)* AIRFLOW AIRFLOW Watts 1800 0.63 1006 1900 0.72 1042 2000 0.82 1078 2100 1024 0.93 1115 2200 1063 1.05 1152 2300 1103 1.18 1044 1189 2400 1143 1.32...
  • Page 41 Table 23—Fan Performance 551B 072 — Vertical Discharge Units; High-Static Motor (Belt Drive)* AIRFLOW AIRFLOW Watts 1800 0.63 1006 1900 0.72 1042 2000 0.82 1078 2100 1024 0.93 1115 2200 1063 1.05 1152 2300 1103 1.18 1044 1189 2400 1143 1.32...
  • Page 42 NOTES: 1. Bold cells indicate field-supplied drive is required. 2. Maximum continuous bhp is 1.20. 3. See general fan performance notes. Table 26—Fan Performance 551B 036, 551C 036 — Horizontal Discharge Units; High-Static Motor (Belt Drive)* AIRFLOW AIRFLOW Watts 0.14 1000 0.16...
  • Page 43 NOTES: 1. Bold cells indicate field-supplied drive is required. 2. Maximum continuous bhp is 1.20. 3. See general fan performance notes. Table 28—Fan Performance 551B 048, 551C 048 — Horizontal Discharge Units; High-Static Motor (Belt Drive)* AIRFLOW AIRFLOW Watts 1200 0.23...
  • Page 44 Table 29—Fan Performance 551B 060, 551C 060 Single-Phase — Horizontal Discharge Units; AIRFLOW AIRFLOW Watts 1500 0.33 1600 0.39 1700 0.45 1800 0.52 1900 0.59 2000 0.67 2100 0.77 1017 2200 0.87 1050 2300 0.97 1082 2400 1033 1.09 1115...
  • Page 45 Table 30—Fan Performance 551B 060, 551C 060 Three-Phase — Horizontal Discharge Units; AIRFLOW AIRFLOW Watts 1500 0.33 1600 0.39 1700 0.45 1800 0.52 1900 0.59 2000 0.67 2100 0.77 1017 2200 0.87 1050 2300 0.97 1082 2400 1033 1.09 1115...
  • Page 46 Table 31—Fan Performance 551B 060, 551C 060 — Horizontal Discharge Units; AIRFLOW AIRFLOW Watts 1500 0.33 1600 0.39 1700 0.45 1800 0.52 1900 0.59 2000 0.67 2100 0.77 1017 2200 0.87 1050 2300 0.97 1082 2400 1033 1.09 1115 2500 1069 1.22...
  • Page 47 Table 33—Fan Performance 551B 072 — Horizontal Discharge Units; High-Static Motor (Belt Drive)* AIRFLOW AIRFLOW Watts 1800 0.51 1900 0.59 2000 0.66 2100 0.75 1019 2200 0.85 1051 2300 0.95 1083 2400 1026 1.06 1115 2500 1061 1.19 1053 1148...

  • Page 48: Pre-Start-Up

    If the suction pressure does not drop and the discharge pressure does not rise to normal levels: 1. Note that the indoor fan (060 and 072 three-phase units only) is probably also rotating in the wrong direction. 2. Turn off power to the unit and tag disconnect.
  • Page 49 2-stage thermostat (Y1 and Y2). For EconoMi$er IV operation, there must be a thermostat call for the fan (G). This will move the damper to its minimum position during the occupied mode. If the increase in cooling capacity causes the supply- -air temperature to drop below 45_F, then the outdoor- -air damper position will be fully closed.

  • Page 50: Service

    The liquid enters the evaporator coil at a temperature lower than in standard cooling operation. This lower temperature increases the latent capacity of the rooftop unit. The refrigerant passes through the evaporator and is turned into a vapor. The air passing over the evaporator coil will become colder than during normal operation.
  • Page 51 Evaporator Fan Belt Adjustment Inspect evaporator fan belt for wear, proper belt tension, and C06045 pulley alignment as conditions require or at the beginning of each heating and air conditioning season. Refer to Step 7 - - Adjust Evaporator Fan Speed for adjustment and alignment procedures.
  • Page 52 Table 34—Perfect Humidity Adaptive Dehumidification System Sequence of Operation and System Response — Single Compressor Unit (551C 024- -060, 551B 036- -072) THERMOSTAT INPUT ECONOMIZER FUNCTION OAT. < Economizer Set Point — — NOTE: On a thermostat call for W1, all cooling and dehumidification will be off.
  • Page 53 Standard 551B 048 Fig. 51 --- Cooling Charging Chart, Standard 551B 060 C06140 Fig. 52 --- Cooling Charging Chart, Standard 551B 072 C06141 Fig. 53 --- Cooling Charging Chart, 551B 036 with Optional Perfect Humidity Adaptive Dehumidification System C06142 C06143...
  • Page 54 Fig. 54 --- Cooling Charging Chart, 551B 048 with Optional Perfect Humidity Adaptive Dehumidification System NOTE: When using the charging charts, it is important that only the subcooling/reheat dehumidification coil liquid line solenoid valve be energized. The subcooling/reheat dehumidification coil...
  • Page 55 551C - 2 TON CHARGING CHART Suction Line Temperature (deg C) 10.5 15.5 105.0 100.0 95.0 90.0 85.0 80.0 75.0 70.0 65.0 Suction Line Temp (deg F) Fig. 57 --- Cooling Charging Chart, Standard 551C 024 551C - - 3 TON CHARGING CHART Suction Line Temperature (deg C) 11.1 16.1...
  • Page 56 551C - - 4 TON CHARGING CHART Suction Line Temperature (deg C) 10.6 15.6 97.0 87.0 77.0 67.0 Suction Line Temp (deg F) Fig. 59 --- Cooling Charging Chart, Standard 551C 048 551C - - 5 TON CHARGING CHART Suction Line Temperature (deg C) 10.0 15.0 115.0...

  • Page 57: Troubleshooting

    A functional view of the EconoMi$er IV is shown in Fig. 61. Typical settings, sensor ranges, and jumper positions are also shown. An EconoMi$er IV simulator program is available from your Bryant distributor to help with EconoMi$er IV training and troubleshooting. EconoMi$er IV Preparation This procedure is used to prepare the EconoMi$er IV for troubleshooting.
  • Page 58 Insufficient evaporator airflow. Temperature too low in conditioned area. Outdoor ambient below 25 F. Evaporator Fan Will Not Shut Off. Time off delay not finished. 6. Remove 1.2 kilo-ohm checkout resistor from terminals S and +. If used, reconnect sensor from terminals S 7.
  • Page 59 †††Modulation is based on the greater of DCV and supply-air sensor signals, between closed and either maximum position (DCV) or fully open (supply-air sig- nal). CAUSE Check power source and evaporator-fan relay. Ensure all wire connections are tight. 1. Fuse open; check fuse. Ensure continuity of wiring.
  • Page 60 C06053 Fig. 61 --- EconoMi$er IV Functional View...

  • Page 61: Start- -Up Checklist

    INSURE PULLEYS ARE PROPERLY ALIGNED AND BELT TENSION HAS BEEN ADJUSTED PER INSTALLATION INSTRUCTIONS AFTER PULLEY ADJUSTMENTS E2007 Bryant Heating & Cooling Systems 7310 W. Morris St. Indianapolis, IN 46231 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

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