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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