Form I-UDB, P/N 202658 R10, Page 22
7.0 Electrical
Supply and
Wiring (cont’d)
FIGURE 18A - Typical Wiring Diagram for Model UDBP or Model UDBS
Sizes 30-125, Single Stage
AG1-AK1-CL1 OR CL22
WD# 185282 REV #2
UDBP & UDBS SERIES 30-125
VENTER
PRESSURE SWITCH
SPARK GAP
GREEN LED
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 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.
LED
Y
Y
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
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
GAS VALVE
BL
BR
P1-2
P1-4
BL
24V
115
V
OL
T
Y
BK
BR
R
L1
NEUTRAL
NEUTRAL
L1
COM
SEC
SYSTEM TRANSFORMER
EAC/BLO
W
OF VENTER ENERGIZED
A
TO OR A
TC
3.0 AMP
C
R
W
G
Y
R
W1
TERMINAL STRIP
R
Y
PR
P3-4
P3-3
P3-2
NORMAL OPERATION NO CALL FOR HEAT
STEADY ON
G
G
G
G
G
GRD
SCREW
115/1/60
40 VA
SPARK
TRANSFORMER
W2
G
P3-5
P3-1
Y
W
FUSE
(UDBS ONLY)
R
DOOR INTERLOCK
(UDBS ONL
Y
)
DISC
ONNECT SWIT
CH
BK
BK
6. THREE SPEED MOTOR CONNECTIONS ARE AS FOLLOWS:
MODELS 30 & 45 USE BLUE MOTOR LEAD, CAP BLACK AND RED.
MODELS 60 - 125 USE BLACK MOTOR LEAD, CAP BLUE AND RED
(MEDIUM)
CAPACITOR
(HIGH)
BR
(LOW)
BR
THREE SPEED
BLOWER MOTOR
(SEE NOTE #6)
R
BL
BK
BK
BROWN - BR
WHITE - W
PURPLE - PR
BLUE - BL
GREEN - G
YELLOW - Y
ORANGE - O
RED - R
BLACK - BK
WIRING CODE
FACTORY WIRING
FIELD WIRING
WIRE CONNECTOR
OPTIONAL FACTORY
WIRING
FIELD CONTROL WIRING
DISTANCE FROM
UNIT TO CONTROL
TOTAL WIRE
350'
150'
LENGTH
250'
MIN. RECOMMENDED
175'
75'
125'
#18 GA. WIRE
#16 GA. WIRE
#14 GA. WIRE
WIRE GUAGE
(OPT CL1) SINGLE ST
A
GE
THERMOST
A
T
WITH F
AN SWIT
CH (SET ANT
. A
T 0.6 AMPS)
R
W
G
WITH F
AN SWIT
CH (SEE NO
TES #8
THR
U #9)
(OPT CL22)
T
WO ST
A
GE DIGIT
AL
THERMOST
A
T
RC
R
R
W2
G
W1
W1
G
7. VERIFY JUMPER ON CL22 THERMOSTAT TERMINALS R TO RC.
8. FAN SWITCH OR LOW STAGE OF CL22 THERMOSTAT ENERGIZES THE BLOWER MOTOR.
9. HIGH STAGE OF CL22 THERMOSTAT INITIATES A CALL FOR HEAT.
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.
6. THERMOSTAT CALLS FOR HEAT, ENERGIZING THE VENTER MOTOR.
7. VENTER PRESSURE SWITCH CLOSES, FIRING UNIT AT FULL RATE.
8. BURNER FLAME IS SENSED, AND IN 30 SECONDS THE BLOWER
MOTOR IS ENERGIZED.
9. 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).
10. SET FAN SWITCH AT "ON" POSITION FOR CONTINUOUS BLOWER
AT "AUTO" POSITION.
OPERATION.
5. LOW STAGE OF THERMOSTAT ENERGIZES THE BLOWER
MOTOR FOR AIR RE-CIRCULATION.
7.4 Wiring Diagrams
