Thomas & Betts UDAP User Manual
Page 25
Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 25
FIGURE 15C - Typical Wiring Diagram for Model UDAP or Model UDAS, Two Stage Gas Valve
VENTER
FAN MOTOR
PRESSURE SWITCH
SPARK GAP
OPERATING SEQUENCE
1. SET THERMOSTAT AT LOWEST SETTING, (FAN SWITCH AT "AUTO" POSITION, OPTION CL18 ONLY).
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).
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, 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.
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
Y
Y
WIRE NUT
FIELD WIRING
OPTIONAL FACTORY
FACTORY WIRING
DSI CONTROL
SW1
FAN OFF DELAY
TIME
90
120
160
180
OFF
OFF
ON
ON
ON
OFF
OFF
ON
1
2
S W
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
PRESSURE SWITCH DOES NOT CLOSE WITHIN
LIMIT SWITCH OR ROLLOUT 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
FLAME ROLLOUT
R
BR
FLAME
ELECTRODE
FLAME
GROUND
P1-8
P1-3
P1-6
P1-5
P1-7
P1-9
BK
W
24V
115/208/230
Y
BK
BR
R
L1
NEUTRAL NEUTRAL
L1
COM
SEC
SYSTEM TRANSFORMER
EAC/BLO
W
WIRING
30 SECONDS OF VENTER ENERGIZED
VO
LT
BK
AT
O OR A
TC
3.0 AMP
C
R
W
G
Y
RH
W1
R
W1
TERMINAL STRIP
Y
PR
P3-4
P3-3
P3-2
TEST
NORMAL OPERATION NO CALL FOR HEAT
STEADY ON
G
G
G
G
G
GRD
SCREW
LINE/1/60
30 VA
CAPACITOR
(SEE NOTE #6)
CAPACITOR
(SEE NOTE #7)
BR/W
BR
BR
BR/W
SPARK
TRANSFORMER
G
(MODELS 30-125 ONLY)
P3-5
P3-1
G
WIRING CODE
BLACK - BK
BROWN - BR
RED - R
ORANGE - O
YELLOW - Y
GREEN - G
BLUE - BL
PURPLE - PR
WHITE - W
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.
Y
8. SET THERMOSTAT FIRST STAGE ANTICIPATOR AT 0.6 AMPS AND
SECOND STAGE ANTICIPATOR AT 0.2 AMPS.
W2
W2
Q674C SUBBASE (SEE NO
TE #8 AND #9)
(OPT CL18)
T874F
THERMOST
AT
O
P1-4
P1-2
W
STG
HIGH
HI
GAS VALVE
HONEYWELL
TWO STAGE
LO
W
C
LO
STG
BR
BL
O
W2
W1
(OPT CL7)
T874F
THERMOST
AT
Q674G SUBBASE (SEE NO
TE #8)
R
9. SET FAN SWITCH AT "ON" POSITION FOR CONTINUOUS FAN OPERATION, OPTION CL18 ONLY.
8. HIGH STAGE OF THERMOSTAT CALLS FOR HEAT, FIRING UNIT AT FULL RATE.
FUSE
RC
9. JUMPER THERMOSTAT TERMINALS RH TO RC.
LO
W
TWO STAGE
GAS VALVE
HIGH
STG
HI
MV
C
STG
HONEYWELL
ALT.
DOOR INTERLOCK
(UDAS ONLY)
R
R
DISCONNECT SWITCH
(UD
AS ONL
Y)
BK
BK
BL
BR
O
WD# 185244 REV #3 AG2
UDAP & UDAS SERIES