Bryant FA4A - Manual (Page 3)

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.
-
3
-