Specifications

ManualsBrandsBryant ManualsHeat Pump551B

TYPICAL WIRING SCHEMATIC (cont)

APPLICATION DATA

CONDENSATE DRAIN PAN —

A sloped condensate drain

pan is supplied on all units. The condensate drain pan must

be externally trapped. Condensate drains are located on

both the bottom and end of the unit. The bottom drain can

be used for thru-the-curb connections.

DUCTWORK —

All ductwork must be attached to flanges. If

no flanges are present, they must be field supplied. Secure

vertical discharge ductwork to roof curb. For horizontal dis-

charge applications, attach ductwork to flanges. Field sup-

plied flanges can be attached to horizontal discharge

openings and all ductwork attached to flanges.

TO CONVERT FROM

VERTICAL DISCHARGE TO HORI-

ZONTAL DISCHARGE (DURABLADE ECONOMIZER

ONLY):

a. Remove economizer or two-position damper to gain

access to return duct opening.

b. Move the horizontal-discharge duct opening covers to

the vertical discharge openings.

c. Rotate economizer or two-position damper 90 degrees

(until the motor faces the condenser section).

d. Rotate the barometric relief damper 90 degrees.

e. Install block-off plate over the opening on the access

panel.

THRU-THE-BOTTOM SERVICE CONNECTIONS —

Thru-

the-bottom connections allow field power wires and control

wires to enter through the basepan.

THERMOSTAT —

Use of 2-stage cooling thermostat is

recommended for all units equipped with economizer.

HEATING-TO-COOLING CHANGEOVER —

All units are

automatic changeover from heating to cooling when auto-

matic changeover thermostat and subbase are used.

AIRFLOW —

Units are draw-thru on cooling and blow-thru

on heating.

MAXIMUM AIRFLOW —

To minimize possibility of conden-

sate blow-off from evaporator, airflow through units should

not exceed 500 cfm/ton.

MINIMUM AIRFLOW —

Minimum airflow for cooling is

300 cfm/ton. For units with electric heating, required mini-

mum cfm is 900 for 551B036; 1200 for 551B048; 1500 for

551B060; 1800 for 551B072; 2250 for 551B090; 2500 for

551B102; 3000 for 551B120; and 4000 for the 551B150,

with the following exceptions:

10.

MINIMUM AMBIENT OPERATING TEMPERATURE —

Min-

imum operating temperature for size 036-150 standard units

is 25 F. With accessory Motormaster® or Motormaster IV

control, units can operate at outdoor temperatures down to

–20 F.

11.

MAXIMUM OPERATING OUTDOOR-AIR TEMPERATURE

—

Maximum outdoor-air operating temperature for cooling

is 125 F.

12.

MOTOR DATA —

Due to Bryant’s internal unit design (draw-

thru over the motor), air path, and specially designed

motors, the full horsepower (maximum continuous bhp)

listed in the Physical Data table and in each Fan Perfor-

mance table can be utilized with extreme confidence.

Using Bryant motors to the values listed in the Physical

Data, Fan Performance, and Evaporator-Fan Motor Data

tables

will not

result in nuisance tripping or premature motor

failure. In addition, the unit warranty will not be affected.

UNIT

551B

UNIT

VO LTAGE

HEATER

UNIT

CONFIGURATION

REQUIRED

MINIMUM CFM

120

208/230 42.4 Horizontal 3200

208/230 50.0 Horizontal 3200

460 50.0 Horizontal or Vertical 3200

090-150

575

17.0

Horizontal or Vertical

2800

34.0 2350

AHA —

Adjustable Heat Anticipator

AWG —

American Wire Gage

C —

Contactor, Compressor

CAP —

Capacitor

CB —

Circuit Breaker

CC —

Cooling Compensator

CLO —

Compressor Lockout

COMP —

Compressor Motor

D —

Diode

EC —

Enthalpy Control

ECON —

Economizer

EPS —

Emergency Power Supply

(9-v Battery)

EQUIP —

Equipment

ER —

Economizer Relay

FPT —

Freeze Protection Thermostat

FSS —

Filter Status Switch

FU —

Fuse

GND —

Ground

HC —

Heater Contactor

HPS —

High-Pressure Switch

IFC —

Indoor (Evaporator) Fan Contactor

IFM —

Indoor (Evaporator) Fan Motor

IFR —

Indoor (Evaporator) Fan Relay

LPS —

Low-Pressure Switch

LSM —

Limit Switch (Manual Reset)

MTR —

Motor

OAT —

Outdoor-Air Thermostat

OFC —

Outdoor (Condenser) Fan Contactor

OFM —

Outdoor (Condenser) Fan Motor

OLR —

Overload Relay

P —

Plug

PL —

Plug Assembly

QT —

Quadruple Terminal

R —

Relay

SAT —

Supply-Air Thermostat

SW1 —

Switch Fully Open

SW2 —

Switch Fully Closed

SW3 —

Switch Minimum Vent Position

SW4 —

Switch Maximum Vent Position

TB —

Terminal Block

TC —

Thermostat-Cooling

TDR —

Time-Delay Relay

TH —

Thermostat-Heating

TRAN —

Transformer

Field Splice

Marked Wire

Terminal (Marked)

Terminal (Unmarked)

Terminal Block

Splice

Splice (Marked)

Factory Wiring

Field Control Wiring

Field Power Wiring

Accessory or Optional Wiring

To indicate common potential only.

Not to represent wiring.

NOTES:

1. If any of the original wire furnished must be replaced, it

must be replaced with type 90° C wire or its equivalent.

2. Three-phase motors are protected under primary

single-phasing conditions.

3. Thermostat: HH07AT170,172

Subbase: HH93AZ176,177,178, and 179

4. Single-Fan Units

Set heat anticipator at .8 amp for first stage, and

.3 amp for second stage.

Two-Fan Units

Set heat anticipator at 1 amp.

5. Use copper conductors only.

6. Single-Fan Units

TRAN is wired for 230-v unit. If unit is to be run with

208-v power supply, disconnect BLK wire from 230-v

tap (ORN) and connect to 208-v tap (RED). Insulate

end of 230-v tap.

Two-Fan Units

Use copper, copper-clad aluminum, or aluminum

conductors.

7. Single-Fan Units

Use copper, copper-clad aluminum, or aluminum

conductors.

Two-Fan Units

TRAN is wired for 230-v unit. If unit is to be run with

208-v power supply, disconnect BLK wire from 230-v

tap (ORN) and connect to 208-v tap (RED). Insulate

end of 230-v tap.