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Introduction, Unit identification, Ii. unit functions – Bryant FA4A User Manual

Page 3: A- transformer, B. indoor fan

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A U G / 1 4 / 2 0 0 8 / T H U 0 3 : 4 5

UTC TECH PUB

F A X N o , 3 1 7 2 4 0 5 6 6 2

table

1—

product

offering

MObÈL

UNIT SIZE

DESCRIPTION

CABINET

FA4ANF

01S-060

Multipolar

Single Piece

FB4ANB

042-070

Multtpoise

Modular

FB4ANF

016-060

Multipoise

Single Piece

FB4ASB

042-060

Multlpolne

50 Hz

Modular

FB4ASF

010-060

MuitipoiSQ

50 Hz

Single Piece

FC4BNB

042-070

Multipoise

Modular

FC4BNF

024-060

Multipoise

Single Piece

FD3ANA

018-030

Horizontal

Single Piece

FF1A/FF1BNA

010-030

Vortical

Single Piece

FG3ANA

024, 036, 048, 060

Horizontal/Small Commercial

Single Piece

FH4ANB

003, 004

Multi poiss

Modular

FH4ANF

001-004

Multipoles

Single Piece

FK4BNri

005, 006

Multipoise

Modular

FK4BNF

001-004

Multipolee

Single Piece

NOTE: Multipoise units are approved for upflow, doivnflow, and horizontal left and right applications.

TABLE 2—FAN MOTOR SPEED TAPS

MODEL

UNIT
SIZE

NUMBER OF

SPEEDS

HIGH

SPEED

MEDIUM

SPEED

LOW

SPEED

COMMON

FA4A

018-036

2

Black

'Blue

Yellow

FA4A

042-060

3

Black

Blue

Red

Yellow

FB4A

018-070

3

Black

Blue

Red

Yellow

FC4B

024-070

3

Black

Slue

Red

Yellow

FD3A

016-030

2

Black

Red

Yellow

FF1A/FF1B

018-030

2

Black

Red

Violet

FG3A

024, 036, 048, 060

1*

FH4A

G01-0D4

3

Black

Blue

Red

Yellow

*Belt drive,

personal injury or death. WARNING signifies hazards which
could result in personal ityury or death. CAUTION is used to
identify unsafe practices which would result in minor personal

injury or product and property damage.

INTRODUCTION

The "F" Scries fan coil units arc designed for flexibility in a variety

of applications, meeting upflow, horizontal, or downflow require­

ments. Units are available in 1-1/2 through 5 ton nominal cooling
capaddes. Factory-authorized, field-installed electric heater pack­
ages are available in 3 through 30 kilowatts.

A

WARNING:

Before installing or servicing fan coil,

always turn off all power to unit. There may be more than
1 disconnect switch. Turn off accessory heater power if

applicable. Electrical shock can cause personal injury or

death.

UNIT IDENTIFICATION

The 16 position numbering chart allows identification of all

available fan coil units, (See Fig. 2.)

FA4A, FB4A, FC4B, AND FR4A CIRCUIT BOARD

FUNCTION AND TROUBLESHOOTING

This section of the service manual describes the CES0130003

PCB by examining the functional operation of the PCB compo­
nents.

I. PRINTED CIRCUIT BOARD (PCB) COMPONENT
LAYOUT AND DESCRIPTION

Layout of the actual PCB is depicted in Fig. 3.

L The low-voltagc ¡stripped leads are used to connect the 24-v

side of transformer
section.

to indoor thermostat and outdoor

2. A 5-amp fuse is used to protect the low-voltagc transformer

secondary.

3. The fan relay is controlled by thermostat and turns fan on

and off,

4. A plug is used as the connection for PCB power and electric

heaters. Note the pin numbers on plug,

5. A time-delay relay circuit keeps fan motor running for 90

sec after G is dc-energiied.

II. UNIT FUNCTIONS

A-

Transformer

1.

Proper Wiring of Transformer Primary or High Side

Yellow wire from Molex plug is wired to C terminal on
transformer and black wire from PCB relay (normally-
opeij) terminal is wired to 2Q5V or 230V terminal on

transformer. Units are factory wired at 230V terminal

2. Proper wiring of Transformer Secondary or 24-v Side

Red wire of transformer is wired to T terminal on PCB and

brown wire of transformer is wired to C terminal on PCB.

NOTE:

T terminal on PCB is used to protect transformer. T

terminal is connected through the fuse to R terminal on PCB.

B. Indoor Fan

1. Wiring

Indoor fan motor yellow lead is wired to C terminal on
transformer. The red, blue, or black speed lead is wired to

5PT terminal On fan relay part of PCB. Units are factory

wired on medium speed (blue lead connected),

NOTE:

Unused fan speed leads must be capped or taped off to

prevent direct short to cabinet surface.

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3

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