Carrier FA4ANF Service Manual page 8

THIS COMPARTMENT MUST BE CLOSED EXCEPT FOR SERVICING
FIELD POWER WIRING
HVTB
L1
YEL
FU5
YEL
CB/FU3
YEL
CB/FU1
YEL
YEL BLU
9
9
BLU
SPT
YEL
PCB
YEL
RED-LO
FM
BRN BLU-MED
BRN
BLK-HI
YEL-COM
GRN/YEL-GND
NOTES:
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. TRANSFORMER PRIMARY LEADS, BLUE 208V, RED 230V.
4. IF ANY OF THE ORIGINAL WIRE, AS SUPPLIED, MUST BE REPLACED,
USE THE SAME OR EQUIVALENT TYPE WIRE.
5. REPLACE LOW VOLTAGE FUSE WITH NO GREATER THAN 5 AMP FUSE.
6. 20KW HEATER USES ONE DOUBLE POLE LS ON MIDDLE TOP ELEMENT.
7. 18, 24 AND 30KW HEATERS USE DOUBLE POLE LIMIT SWITCHES.
8. LARGEST HEATERS ARE SHOWN, SMALLER HEATERS WILL HAVE FEWER ELEMENTS AND
COMPONENTS.
9. 1 PHASE HEATERS ARE SHOWN WIRED FOR SINGLE SUPPLY CIRCUIT.
10. USE 60 AMP CLASS K FUSES ONLY, FOR REPLACEMENT.
11. (3) SPEED MOTOR SHOWN. OPTIONAL (2) SPEED MOTOR USES HI (BLK) AND LOW
(BLU OR RED).
12. CONNECT R TO R, G TO G, ETC., SEE OUTDOOR INSTRUCTION FOR DETAILS.
13. IF WIRE CRIMP IS REMOVED AN EMERGENCY HEAT RELAY IS REQUIRED.
(SEE OUTDOOR-THERMOSTAT INSTRUCTIONS)
1. W2--When the thermostat sends a signal to W2, a 24-v dc
signal is applied across sequencer number 1, causing it to
close. When sequencer number 1 closes, the first stage of
electric heat energizes after a short delay. In straight electric
heat, the fan is also energized through the normally closed
contacts of the fan relay. In cooling, heat pump, or manual fan
mode, the fan will already be running since the fan relay
would have been energized. When the thermostat stops calling
for electric heat, the 24-v dc signal to sequencer number 1
turns off and the sequencer opens after a delay of 60 to 90 sec.
When the sequencer opens, the first stage of heat turns off
along with the fan, providing that the thermostat is not calling
BLOWER MOTOR
ROTATION
30KW 1PH SCHEMATIC DIAGRAM
DISCONNECT PER NEC
SEE RATING PLATE
FOR VOLTS & HERTZ
GND
SEE NOTE #1
HTR6 BLK
LS6 BLK
YEL
11
12
SEQ 3
HTR5 BLK
BLK
YEL LS5
9
10
HTR4 BLK
BLK
YEL LS4
8
7
SEQ 2
HTR3 BLK
LS3 BLK
YEL
6
5
HTR2 BLK
YEL LS2
BLK
4 3
SEQ 1
HTR1 BLK
YEL LS1
BLK
2 1
BLU
BLK
SEQ1
ORN
VIO
BLK
11 7 3 2
3 2
11
7
BLK
GRY
NC
G
RED
NO
R
FR
F
BRN
T
1
C
208V 230V
C
R
RED
BARRIER
TRAN
BRN
INDOOR
THERMOSTAT
Fig. 4—Wiring Diagram of Sequencer Heater
CAP CAPACITOR
COM COMMON
F LOW VOLTAGE FUSE
FM FAN MOTOR
FIELD POWER WIRING
FR PCB FAN RELAY
L2
FU LINE FUSE
GND EQUIPMENT GROUND
FU6
HVTB HIGH VOLTAGE TERM BLOCK
BLK
HTR HEATER
BLK
CB/FU4
COOLING CONTROL ONLY
BLK
CB/FU2
FIELD
SEQ2 POWER
WIRING
BRN
L1
RED
YEL
SEQ3
BRN
9
GRAY
208/240VAC
PLUG
9
6 1 4
6 1
4
RECP
BRN
FIELD POWER WIRING
HVTB
W2 W3 E
YEL
L1
Y
W2 FU5
G
E
WHT
SEE NOTE #13
L
YEL
SEE NOTE #12
OUTDOOR
YEL LS4
UNIT
CB/FU3
YEL
YEL
YEL
CB/FU1
YEL
9
208/240VAC
321214-101 REV. C
for the fan. Note that the electric heat cannot be turned on
without the fan being turned on at the same time. This is a fan
interlock system.
2. W3--When a signal is sent to W3, 2 control signals are sent
out to the sequencers; a 24-v dc signal to sequencer number 1
through the diode interlock, and a 24-v ac signal to sequencer
number 2. The 24-v ac signal applied to sequence number 2
causes the sequencer to close, with the second stage of electric
heat turning on after a short delay.
The 24-v dc signal applied to sequencer number 1 causes the first
stage of electric heat to turn on in the same manner as described in
W2 above. Note that W3 is interlocked with the fan, since
sequencer number 1 is turned on whenever W3 has a signal sent to
8
CAUTION:
NOT SUITABLE FOR USE ON SYSTEMS EXCEEDING
150V TO GROUND
ATTENTION:
LEGEND
LS LIMIT SWITCH
MARKED TERMINAL
PLUG AND RECEPTACLE
PCB PRINTED CIRCUIT BOARD
SEQ SEQUENCER
TRAN TRANSFORMER
UNMARKED TERMINAL
RECP RECEPTACLE
CB CIRCUIT BREAKER
FIELD POWER WIRING
L2
BLK
11 7 6 1
3 2
24VAC
6 1
11 7 3 2
30KW 3PH SCHEMATIC DIAGRAM
DISCONNECT PER NEC
SEE RATING PLATE FOR VOLTS & HERTZ
GND
SEE NOTE #1
BLK
L3
HTR6 BLK
LS6 BLK
YEL
11 FU6
12
SEQ 3
HTR5 BLK
BLK
LS5
9
10
HTR4 BLK
BLK
8 7
CB/FU4
SEQ 2
HTR3 BLK
BLK
LS3
6 5
HTR2 BLK
LS2 BLK
3
4
CB/FU2
SEQ 1
HTR1 BLK
BLK
LS1
1
2
RED
SEQ1
ORN VIO GRAY
11 7 3 2 6 1
24VAC
PLUG
4
24VAC
4
RESP
L2
BLK
BLK
SEQ2
BRN
SEQ3
BRN
PLUG
4
24VAC
A94346