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.
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.
III.
TROUBLESHOOTING
THE
PRINTED-CIRCUIT
BOARD
Use wiring schematics shown in Fig. 4 and 5 as a guide in
troubleshooting PCB unless otherwise noted.
A.
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.
Fig. 3B—FF1D Typical Wiring Diagram
A98229
SEE NOTE #7
F
1
NO
NC
SPT
OUTDOOR
UNIT
G
PCB
BL
K
C
INDOOR
THERMOSTAT
BARRIER
C
T
R
FR
NOTES:
SEE RATING PLATE FOR VOLTS & HERTZ
DISCONNECT PER NEC
FIELD POWER WIRING
COOLING CONTROLS
ELECTRIC HEAT
230V
208V
BRN
RED
TRAN
COM
GRN/YEL
GND
YEL
LO
HI
COM
RED
YEL
BLK
FM
BRN
BRN
CAP
RELAY 1
22 VDC COIL
R E C
SCHEMATIC DIAGRAM
COMPONENT ARRANGEMENT
CAUTION:
ATTENTION:
NOT SUITABLE FOR USE ON SYSTEMS EXCEEDING 150V TO GROUND
NE CONVIENT PAS AUX INSTALLATIONS DE PLUS DE 150 V A LA TERRE
COM
208 V
230 V
TR
A
N
RED
24 V
BRN
GND
NC
NO
SPT
FR
T
C
1
R
G
PCB
F
L2
L1
DISC
60A 60A
RED-LOW
BLK-HI
GRN/YEL-GND
FM
BRN
BRN
YEL-COM
FAN MOTOR THERMALLY PROTECTED
CAP
GND
SEE NOTE #5
LEGEND
RED
ORN
VIO
GND
2
HTR2 BLK
8
LS2
6
HTR1 BLK
4
LS1
RELAY 1
YEL
BLK
SEE NOTE #1
BLK
SYSTEM TRANSFORMER: 40.0VA
FAN COIL/HEATER: 8.4VA
REMAINING VA AVAILABLE: 31.6VA
REC
0
1
2
8
6
4
RELAY 1
CAP
CAPACITOR
COM
COMMON
F
FUSE
FM
FAN MOTOR
FIELD POWER WIRING
FR
PCB FAN RELAY
EQUIPMENT GROUND
GND
SPT
FAN SPEED TAP LOCATION
HTR
HEATER
LS
LIMIT SWITCH
MARKED TERMINAL
PLUG AND RECEPTACLE
PCB
PRINTED CIRCUIT BOARD
REC
RECTIFIER
TRAN
TRANSFORMER
UNMARKED TERMINAL
R
W
G
324494-101 REV. A
1. Use copper wire (75¡c min) only between disconnect switch and unit.
2. To be wired in accordance with nec and local codes.
3. If any of the original wire, as supplied, must be replaced, use the same or
equivalent type wire.
4. Replace low voltage fuse with no greater than 5 AMP fuse.
5. (2) Speed Motor uses HI (BLK) and LOW (RED).
6. Smaller heaters will have fewer components.
7. Connect R to R, G to G, etc., see outdoor instructions for details.
8. Cooling controls wiring not used with electric heaters.
HTR
HTR
LS
LS
DISC
DISCONNECT
YEL
YEL
BLU
BLK
BRN
RED
GRY
GRY
ORN
YEL
BLK
DI
S
C
DI
S
C
BLU
BLK
DIS
C
YEL
DIS
C
VIO
BLK
SEE N
O
T
E
#
8
SEE N
O
T
E
#
8
YEL
L1
SEE NOTE #6
L1
L2
L2
MINIMUM MOTOR SPEED SELECTION
FAN COIL SIZE
MOTOR SPEED ONE HTR
MOTOR SPEED TWO HTR
LO
LO LO
LO LO
LO
018 024 030
ROTATION
This compartment must be closed except
when servicing.
—5—
