Form I-UDB, P/N 202658 R10, Page 25
FIGURE 18D - Typical Wiring Diagram for Model UDBP or Model UDBS, Sizes 150-400, Two Stage
AG2-AN2-CL22
UDBP & UDBS SERIES 150-400
WD# 186441 REV #2
VENTER
CONTACTOR COIL
SPARK GAP
GREEN LED
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
LED
OPTIONAL FIELD WIRING
FIELD WIRING
OPTIONAL FACTORY
FACTORY WIRING
DSI CONTROL
FAST FLASH
1 FLASH
2 FLASH
3 FLASH
4 FLASH
STEADY OFF
LED FLASH CODES
NORMAL OPERATION CALL FOR HEAT
IN LOCKOUT FROM FAILED IGNITIONS OR FLAME LOSSES
PRESSURE SWITCH DOES NOT CLOSE WITHIN 30 SECONDS
LIMIT SWITCH OPEN
PRESSURE SWITCH IS CLOSED BEFORE VENTER IS ENERGIZED
INTERNAL CONTROL FAULT OR NO POWER
YELLOW LED
FLAME SENSED
STEADY ON
SLOW FLASH
WEAK FLAME
UNDESIRED FLAME (VALVE OPEN & NO CALL FOR HEAT)
FAST FLASH
IND
BK
NEUTRAL
W
MOTOR
LED
OK
FLAME
G
Y
NEUTRAL
BK
W
LIMIT CONTROL
R
R
R
R
BR
FLAME
ELECTRODE
FLAME
GROUND
P1-8
P1-3
P1-6
P1-5
P1-7
P1-9
BK
W
P1-2
P1-4
BL
24V
115/208/230
Y
BK
BR
R
L1
NEUTRAL
NEUTRAL
L1
COM
SEC
SYSTEM TRANSFORMER
EAC/BLO
WIRING
OF VENTER ENERGIZED
V
OL
T
BK
AT
O OR A
TC
3.0 AMP
C
R
W
G
Y
R
Y
PR
P3-4
P3-3
P3-2
NORMAL OPERATION NO CALL FOR HEAT
STEADY ON
G
GRD
LUG
40 VA
CAPACITOR
(SEE NOTE #6)
BR
BR/W
SPARK
TRANSFORMER
P3-5
P3-1
W
FUSE
(UDBS ONLY)
R
DOOR INTERLOCK
BLOWER MOTOR
208-230/3/60
OR
L1
T1
R OR BK
BLOWER MOTOR
CONTACTOR CONTACTS
L3
T3
L2
T2
R OR W
R
PROTECTED
MOTOR
BLOWER
INTERNALLY
G
LINE/1/60
GRD
LO
W
TWO STAGE
GAS VALVE
HIGH
MV
GAS VALVE
TWO STAGE
O
HIGH
LO
W
ST
G
ST
G
C
BR
BL
O
ST
G
LO
C
ST
G
HONEYWELL
ALT.
HONEYWELL
W2
R
W1
TERMINAL STRIP
G
O
HI
HI
Y
Y
PRESSURE
SWITCH
Y
BR
WHITE - W
PURPLE - PR
BLUE - BL
GREEN - G
YELLOW - Y
ORANGE - O
RED - R
BROWN - BR
BLACK - BK
WIRING CODE
C
ONTR
OL SWIT
CH
Y
(UDBS ONL
Y
)
2
3
Y
BK
6
5
BK
DISCONNECT SWITCH
CUSTOMER'S
NOTES
1. THE FOLLOWING CONTROLS ARE FIELD INSTALLED OPTIONS: THERMOSTAT
2. DOTTED WIRING 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, FLAME ROLLOUT AND LIMIT WIRING WHICH MUST BE 150° C.
4. USE 18 GA. WIRE FOR ALL WIRING ON THE UNIT.
5. LINE AND FAN MOTOR BRANCH WIRE SIZES SHOULD BE OF A SIZE TO PREVENT
VOLTAGE DROPS BEYOND 5% OF SUPPLY LINE VOLTAGE.
6. CAPACITOR IS REMOTE MOUNTED AND INCLUDED ONLY ON 115V MODELS
150-400 AND 208/230V MODELS 100-400.
7. CAPACITOR IS REMOTE MOUNTED AND INCLUDED ONLY ON MODELS 150 - 400.
WITH F
AN SWIT
CH (SEE NO
TE #8)
RC
W2
W1
R
(OPT CL22)
TWO STEG DIGIT
AL
THERMOST
AT
G
8. VERIFY JUMPER ON THERMOSTAT TERMINALS R TO RC.
OPERATING SEQUENCE
1. SET THERMOSTAT AT LOWEST SETTING, FAN SWITCH
2. TURN ON MANUAL GAS VALVE.
3. TURN ON POWER TO UNIT.
4. SET THERMOSTAT AT DESIRED SETTING.
5. LOW STAGE OF THERMOSTAT CALLS FOR HEAT, ENERGIZING THE VENTER MOTOR.
6. VENTER PRESSURE SWITCH CLOSES, FIRING UNIT AT LOW RATE.
7. BURNER FLAME IS SENSED, AND IN 30 SECONDS THE FAN
MOTOR IS ENERGIZED.
10. 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).
9. SET FAN SWITCH AT "ON" POSITION FOR CONTINUOUS FAN OPERATION.
8. HIGH STAGE OF THERMOSTAT CALLS FOR HEAT, FIRING UNIT AT FULL RATE.
AT "AUTO" POSITION.
