Bryant 551B Electric Heater Usage, †Used to determine minimum disconnect per NEC

Page 10

LEGEND AND NOTES FOR TABLE 2

LEGEND

FLA — Full Load Amps

HACR — Heating, Air Conditioning and Refrigeration

IFM — Indoor (Evaporator) Fan Motor

LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP— Maximum Overcurrent Protection

NEC — National Electrical Code

OFM — Outdoor (Condenser) Fan Motor

RLA — Rated Load Amps

*Heater capacity (kW) is based on heater voltage of 208, 240, 480, and 575-V. If power distribution voltage varies from rated heater voltage, heater kW will vary accordingly.

†Used to determine minimum disconnect per NEC.

NOTES:

1.

In compliance with NEC requirements for multimotor and combination load equip-

 

ment (refer to NEC Articles 430 and 440), the overcurrent protective device for the

 

unit shall be fuse or HACR breaker.

2.

Unbalanced 3-Phase Supply Voltage

Example: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

452 + 464 + 455

Average Voltage =

3

=1371

3

=457

Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v

(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v

Maximum deviation is 7 v.

Determine percent of voltage imbalance.

Never operate a motor where a phase imbalance in supply voltage is greater than

% Voltage Imbalance = 100 x

7

2%. Use the following formula to determine the percent of voltage imbalance.

% Voltage Imbalance

max voltage deviation from average voltage

= 100 x

average voltage

457

= 1.53%

This amount of phase imbalance is satisfactory as it is below the maximum allow- able 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

3.Non-fused disconnect switch cannot be used when rooftop unit electrical ratings exceed 80 amps.

Table 3 — Electric Heater Usage

UNIT

VOLTAGE

ACCESORY

ACCESSORY HEATER

ACCESSORY SINGLE POINT BOX

PART NUMBER

PART NUMBER

551B

(60 Hz)

 

kW

 

CRHEATER---A00

CRSINGLE---A00

 

 

 

 

 

 

7.8/

9.6/10.4

017

006

 

208/230/240

12.0/14.7/16.0

010

006

 

(3 phase)

18.6/22.8/24.8

011

007

 

 

24.0/29.4/32.0

012

007

 

 

31.8/39.0/42.4

012+017

009

090

 

12.8/13.9

016

006

 

460/480

15.2/16.5

013

006

 

(3 phase)

25.6/27.8

014

006

 

 

30.4/33.0

015

006

 

 

38.4/41.7

014+016

008

 

575

 

17.0

018

006

 

(3 phase)

 

34.0

019

006

 

 

7.8/

9.6/10.4

017

011

 

208/230/240

12.0/14.7/16.0

010

011

 

(3 phase)

18.6/22.8/24.8

011

012

 

 

24.0/29.4/32.0

012

012

 

 

31.8/39.0/42.4

012+017

015

102

 

12.8/13.9

016

011

 

460/480

15.2/16.5

013

011

 

(3 phase)

25.6/27.8

014

011

 

 

30.4/33.0

015

011

 

 

38.4/41.7

014+016

014

 

575

 

17.0

018

011

 

(3 phase)

 

34.0

019

011

 

 

7.8/

9.6/10.4

017

011

 

208/230/240

12.0/14.7/16.0

010

012

 

(3 phase)

24.0/29.4/32.0

012

012

 

 

31.8/38.9/42.4

012+017

015

 

 

37.5/46.0/50.0

010+012

015

120

 

12.8/13.9

016

011

460/480

15.2/16.5

013

011

 

(3 phase)

30.4/33.0

015

011

 

 

38.4/41.7

014+016

014

 

 

46.0/50.0

013+015

014

 

575

 

17.0

018

011

 

(3 phase)

 

34.0

019

011

 

 

 

51.0

018+019

014

 

 

7.8/

9.6/10.4

017

012

 

208/230/240

12.0/14.7/16.0

010

012

 

(3 phase)

24.0/29.4/32.0

012

012

 

 

31.8/38.9/42.4

012+017

015

 

 

37.5/46.0/50.0

010+012

015

150

 

12.8/13.9

016

011

460/480

15.2/16.5

013

011

 

(3 phase)

30.4/33.0

015

011

 

 

38.4/41.7

014+016

014

 

 

46.0/50.0

013+015

014

 

575

 

17.0

018

011

 

(3 phase)

 

34.0

019

014

 

 

 

51.0

018+019

014

NOTES:

1.The rated heater voltage is 240, 480, and 575 v. If power distribution voltage varies from rated heater voltage, heater kW vary accordingly.

2.To determine heater kW at voltages other than those shown in table, use the following formula: Heater kW new = Heater kW rated x (unit power distribution voltage / rated heater voltage) 2

As an example:

For a 16 kW heater rated at 240 v with a power distribution voltage of 215 v kW new = 16 kW (215/240) 2

kW new = 12.8 kW (rating at 215 v)

10

Image 10
Contents Installation ContentsSafety Considerations Provide Unit SupportIV. RIG and Place Unit III. Install Condensate Drain Line and External TrapPositioning Roof Curb Details Weight OperatingBase Unit Dimensions Physical Data Unit 551BIFC Field Power SupplyMake Electrical Connections NECElectrical Data FLA MCA Mocp LRA HacrVoltage Comp no Electric Heater Electric Heater Usage †Used to determine minimum disconnect per NECVI. Adjust FACTORY-INSTALLED Options A. Disconnect Switch Field Control WiringHeat Anticipator Settings Perfect Humidity Dehumidification SystemAccessory Field-Installed Humidistat Manual Outdoor-Air Damper Convenience OutletOptional EconoMi$er EconoMi$er IV Standard Sensors Hood Box RemovalOutdoor-Air Hood Construction EconoMi$er IV Control Modes EconoMi$er IV Sensor UsageEconoMi$er IV Controller Potentiometer LED Locations Enthalpy Changeover Set Points Page CO2 Sensor Standard Settings PpmMinimum Required Airflow Exceptions VII. Adjust EVAPORATOR-FAN SpeedUnit Heater Required Config UrationFan Rpm at Motor Pulley Setting* High-Static Motor/Drive Fan Rpm at Motor Pulley Setting* Standard Motor/DriveEvaporator-Fan Motor Data Standard Motor Evaporator-Fan Motor Data High-Static Motors Accessory/FIOP EconoMi$er IV Static Pressure* in. wgAccessory/FIOP Electric Heaters Static Pressure in. wg General FAN Performance NotesAirflow 901 703 1125 762 1365 832 690 1051 750 1285866 697 1088 756 1324 974 716 1204 774 1449866 489 386506 629 625 688 745 502 4241748 15671656 1844865 707 748 684 891 738 1034 789 1177805 695 953 749 1100 799 1249 760 1170 809 13231665 865 707 1018 760 1170 809 1323929 718 1086 771 1244 820 1401 1873683 1197 739 654 1040 713668 1116 726 697 1281 7531252 465 402596 629 802 694 1021 471 421944 695 1194 756 1453 823 674 1059 737 1306882 684 1125 746 1378 1009 705 1266 766 1533868 462 348467 614 594 681 728 474 3812293 996 2501 1038 2713 27162821 2930723 1577 710 14821677 808 1876 855 2081 1775 820 19781677 808 1876 1492 784 16831582 796 1777 1877628 997 685 614 929 673781 1445 791 1525PRE-START-UP Internal WiringVI. Refrigerant Service Ports START-UP Unit PreparationIX. Cooling Heating if Accessory Heater is InstalledXI. Safety Relief XII. Ventilation Continuous FANPerfect Humidity System Normal Design Cooling Operation Evaporator Coil Units With Power ExhaustService Cleaning Condenser CoilsECONOMI$ER IV Adjustment III. CONDENSER-FAN Adjustment FIGIV. BELT/PULLEY Adjustment II. LubricationCooling Charging Charts, Standard 551B090 Unit Cooling Charging Charts, Standard 551B120 Unit VII. Replacement Parts Cooling Troubleshooting Troubleshooting Unit TroubleshootingProblem Cause Remedy Will Not Energize Subcooling Mode Liquid ReheatReheat Mode Will Not Energize Low System CapacityII. ECONOMI$ER IV Troubleshooting Inputs Outputs EconoMi$er IV Troubleshooting CompletionEconoMi$er IV Input/Output Logic Demand Control EnthalpyOperating sequence Cooling EconoMi$er Heating IndexPage Preliminary Information START-UP ChecklistTemperatures III. START-UP Electrical
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551B specifications

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