Product Offering; Fan Motor Speed Taps; Troubleshooting Pcb - Carrier FA4ANF Service Manual

MODEL
FA4ANF
FB4ANB
FB4ANF
FB4ASB
FB4ASF
FC4BNB
FC4BNF
FD3ANA
FF1A/FF1B/FF1C/FF1D
FG3ANA
FH4ANB
FH4ANF
FK4CNB
FK4CNF
FX4ANF
FX4ANB
FV4ANF
FV4ANB
NOTE: Multipoise units are approved for upflow, downflow, and horizontal left and right applications.
MODEL
FA4A
FA4A
FB4A
FC4B
FD3A
FF1A/FF1B/FF1C/FF1D
FG3A
FH4A
FX4A
*Belt drive.
→**Yellow on FF1D
1. W2
When thermostat sends a signal to W2, a 24-vac signal is
applied across sequencer/relay number 1, causing it to close.
When sequencer/relay number 1 closes, first stage of electric
heat is energized. In straight electric heat, fan is also energized
through the normally-closed contacts of fan relay. In cooling,
heat pump, or manual fan mode, fan will already be running
since fan relay would have been energized. When thermostat
stops calling for electric heat, the 24-vac signal to
sequencer/relay number 1 turns off and sequencer opens after
a delay of 60 to 90 sec. Heaters equipped with relays will be
de-energized immediately. When sequencer/relay opens, first
stage of heat turns off along with fan, providing thermostat is
not calling for the fan.
2. W3
When a signal is sent to W3, a 24-vac signal to
sequencer/relay number 2 causes it to close, with second stage
of electric heat turning on. The 24-vac signal applied to
sequencer/relay number 1 causes fan to operate. Timing is
such that sequencer/relay number 1 will turn on before
sequencer/relay number 2. When signal to W3 is turned off,
sequencer/relay number 2 opens. If W2 is also satisfied, first
stage of electric heat and fan will also turn off, providing
thermostat is not calling for the fan.
Table 1—Product Offering
UNIT SIZE
018-060
042-070
018-060
042-060
018-060
042-070
024-060
018-030
018-030
024, 036, 048, 060
003, 004
001-004
006
001-005
030-048
060
002, 003, 005
006
Table 2—PSC Fan Motor Speed Taps
UNIT NUMBER OF
SIZE SPEEDS
018-036
042-060
018-070
024-070
018-030
018-030
024, 036, 048, 060
001-004
030-060
DESCRIPTION
Multipoise
Multipoise
Multipoise
Multipoise
50 Hz
Multipoise
50 Hz
Multipoise
Multipoise
Horizontal
Vertical
Horizontal/Small Commercial
Multipoise
Multipoise
Multipoise
Multipoise
Multipoise
Multipoise
Multipoise
Multipose
HIGH
SPEED
2 Black
3 Black
3 Black
3 Black
2 Black
2 Black
1* —
3 Black
3 Black
3. E
When thermostat sends a signal to E, a 24-vac signal is sent to
sequencer/relay number 3. The 24-vac signal applied to
sequencer/relay number 3 turns on third stage of electric heat.
The 24-vac signal applied to sequencer/relay number 1 turns
on first stage of electric heat and fan. When thermostat stops
calling for electric heat, the signal to sequencers/relays 1, 2,
and 3 are turned off, and sequencers/relays open. This causes
electric heat to turn off with fan providing thermostat is not
calling for the fan.
NOTE: Electric heaters are factory wired with all stages tied
together. If independent staging is desired, consult outdoor ther-
mostat installation instructions, or corporate thermostat instruc-
tions.
Step 3—Troubleshooting the Printed-Circuit Board
Use wiring schematics shown in Fig. 4 and 5 as a guide in
troubleshooting PCB unless otherwise noted.
IF FAN WILL NOT TURN ON FROM THERMOSTAT:
If There Is No High Voltage To Transformer:
1. Check plug/receptacle connection. This supplies power from
heaters to PCB Fan Relay. Be sure plug is connected properly.
2. Check sequencer/relay number 1 and plug wiring. Yellow
wire should be connected to pin number 9 of plug and to limit
switch. Black wire should be connected to pin number 7 of
plug and to sequencer/relay number 1.
4
CABINET
Single Piece
Modular
Single Piece
Modular
Single Piece
Modular
Single Piece
Single Piece
Single Piece
Single Piece
Modular
Single Piece
Modular
Single Piece
Single Piece
Modular
Single Piece
Modular
MEDIUM LOW
SPEED SPEED
— Blue
Blue Red
Blue Red
Blue Red
— Red
— Red
— —
Blue Red
Blue Red
COMMON
Yellow
Yellow
Yellow
Yellow
Yellow
Violet**
—
Yellow
Yellow