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Form 405, Page 18
Figure 18 - Typical Wiring Diagram for Models CAUA with Belt-Drive Blower Motor
40 VA. CONTROL
BK
BL
24V
LINE VOLT
BR
TRANSFORMER
Y
LINE
GROUND
PSW
HI LIMIT
HI LIMIT
PRESSURE SWITCH
HIGH
LIMIT
W
G
R
24VAC
FLAME SENSING
PROBE
FLAME SENSE
IGNITOR
HV LEAD
ROLLOUT
LED
BK
BK
BL
BL
BL
BL
R
Y
Y
R
BR
BR
R
BR
R
CHASSIS GRND.
BURNER GROUND
IN
OUT
VAC HOT
HOT
IN
DSI CONTROL
L2
L2
L2
L1
L1
1
1
1
7
7
7
Y
2
2
CNO
NC
FLAME
ROLLOUT SWITCH
208 OR 230/1/60
GRD
G
BK
OPTIONAL DISCONNECT SWITCH
CONTACTOR
MOTOR
W
MOTOR
BLOWER
Y
MAIN TERMINAL BLOCK
UNIT TERMINAL STRIP
THERMOSTAT TERMINAL STRIP
L2
BR
Y
L1
L2
3
DOOR SWITCH
BLBL
BL
Y1
Y2
W1
W2
SET ANTICIPATOR AT 0.6 AMPS
T87F THERMOSTAT Q539A SUBBASE
W
Y
R
G
C
R
G
Y
BK
R
BL
R
BK
Y
BL
TERMINAL STRIP
THERMOSTAT
PROTECTED
INHERENTLY
BK
W
BK
W
R
G
GRD
C
COOL RELAY COIL
CUSTOMER'S
VALVE
7
(SEE NOTE)
BR
BL
VENTER MOTOR
CONTACTOR COIL
(SEE NOTE #8)
BK OR BR
MOTOR
BK OR BL
BK
BK
W
ACB COOL
BLWR AUX
ACB HEAT
CMB
OR PV
TH-TR
TH OR
BK
BY-PASS GAS VALVE
HONEYWELL
PILOT
MV
PLUG PILOT OUTLET
MAIN
TR OR
PV-MV
BK
ALTERNATE W.R. OR ROBERTSHAW
BY-PASS GAS VALVE
PLUG PILOT OUTLET
P
MAIN
BL
PILOT
M
BR
C
OPERATING SEQUENCE
1. SET THERMOSTAT SYSTEM SWITCH AT "OFF" POSITION; FAN SWITCH AT "AUTO" POSITION.
2. TURN ON MANUAL GAS VALVE.
3. TURN ON POWER TO UNIT.
4. SET THERMOSTAT SYSTEM SWITCH AT "HEAT" POSITION; FAN SWITCH AT "AUTO" POSITION.
5. THERMOSTAT CALLS FOR HEAT, ENERGIZING THE VENTER MOTOR.
6. VENTER PRESSURE SWITCH CLOSES, FIRING UNIT.
7. BURNER FLAME IS SENSED, AND IN 30 SECONDS THE BLOWER
MOTOR IS ENERGIZED.
8. IF THE FLAME IS EXTINGUISHED DURING MAIN BURNER OPERATION,
THE INTEGRATED CONTROL SYSTEM CLOSES THE MAIN VALVE AND
MUST BE RESET BY INTERRUPTING POWER TO THE CONTROL CIRCUIT
(SEE LIGHTING INSTRUCTIONS).
NOTES
1. THE FOLLOWING CONTROLS ARE FIELD INSTALLED OPTIONS: THERMOSTAT
2. DOTTED WIRING AND COOL RELAY COIL INSTALLED BY OTHERS.
3. CAUTION: IF ANY OF THE ORIGINAL WIRING AS SUPPLIED WITH THE
APPLIANCE MUST BE REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL
HAVING A TEMPERATURE RATING OF AT LEAST 105° C. EXCEPT FOR SENSOR
LEAD WIRE WHICH MUST BE 150° C.
4. USE 18 GA. WIRE FOR CONTROL WIRING ON THE UNIT.
6. LINE AND FAN MOTOR BRANCH WIRE SIZES SHOULD BE OF A SIZE TO PREVENT
VOLTAGE DROPS BEYOND 5% OF SUPPLY LINE VOLTAGE.
5. USE 14 GA. WIRE FOR LINE AND MOTOR WIRING ON UNIT.
9. SET THERMOSTAT SYSTEM SWITCH AT "COOL" POSITION, FAN SWITCH AT "AUTO" POSITION.
(A) ON A CALL FOR COOLING, BLOWER MOTOR IS ENERGIZED AND COOLING
CIRCUIT IS ENERGIZED.
10. WHEN BLOWER DOOR IS OPENED, THE UNIT IS SHUTDOWN.
7. ON 208/230V. UNITS THE CONTROL TRANSFORMER HAS A DUAL VOLTAGE PRIMARY.
FOR 208V. UNITS, USE BLACK AND RED LEADS (CAP YELLOW).
FOR 230V. UNITS, USE BLACK AND YELLOW LEADS (CAP RED).
8. VENTER MOTOR ON 350-400 UNITS HAS BROWN AND BLUE WIRES.
11. SET THERMOSTAT SYSTEM SWITCH AT "OFF" POSITION, FAN SWITCH AT "AUTO" POSITION, FOR SHUTDOWN.
9. WHEN PROVIDING OR REPLACING FUSES IN THE FUSIBLE DISCONNECT SWITCH
USE DUAL ELEMENTS TIME DELAY FUSES AND SIZE ACCORDING TO 1.25
TIMES THE MAXIMUM TOTAL INPUT AMPS.
LED CODES
SLOW FLASH NORMAL OPERATION - NO CALL FOR HEAT
FAST FLASH NORMAL OPERATION - CALL FOR HEAT
2 FLASHES SYSTEM LOCKOUT - FAILED TO DETECT OR SUSTAIN FLAME
3 FLASHES PRESSURE SWITCH OPEN OR CLOSED
4 FLASHES HIGH LIMIT OPEN
5 FLASHES FLAME SENSED AND GAS VALVE NOT ENERGIZED
STEADY ON INTERNAL FAILURE (MICRO-CONTROLLER FAILURE: SELF CHECK)
FIELD CONTROL WIRING
150'
250'
350'
75'
125'
175'
#18 GA. WIRE
#16 GA. WIRE
#14 GA. WIRE
TOTAL WIRE
LENGTH
DISTANCE FROM
UNIT TO CONTROL
MIN. RECOMMENDED
WIRE GUAGE
FIELD WIRING
OPTIONAL FACTORY
WIRING
FACTORY WIRING
WHITE - W
PURPLE - PR
BLUE - BL
GREEN - G
YELLOW - Y
ORANGE - O
RED - R
BROWN - BR
BLACK - BK
WIRING CODE
TYPICAL WIRING DIAGRAMS (cont'd)