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Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 24
FIGURE 15B - Typical Wiring Diagram for Model UDAP or Model UDAS, Single Stage with
Optional Air Recirculation
VENTER
FAN MOTOR
PRESSURE SWITCH
SPARK GAP
OPERATING SEQUENCE
1. SET THERMOSTAT AT LOWEST SETTING, FAN SWITCH AT "AUTO" POSITION.
2. TURN ON MANUAL GAS VALVE.
3. TURN ON POWER TO UNIT.
4. SET THERMOSTAT AT DESIRED SETTING.
6. HIGH STAGE OF THERMOSTAT CALLS FOR HEAT, ENERGIZING THE VENTER MOTOR.
7. VENTER PRESSURE SWITCH CLOSES, FIRING UNIT AT FULL RATE.
8. SET FAN SWITCH AT "ON" POSITION FOR CONTINUOUS FAN OPERATION.
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).
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 GAUGE
LED
Y
Y
WIRE NUT
FIELD WIRING
OPTIONAL FACTORY
FACTORY WIRING
DSI CONTROL
SW1
FAN O
FF DELAY
TIM
E
90
120
160
180
O
FF
O
FF
O
N
O
N
O
N
O
FF
O
FF
O
N
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 OR ROLLOUT SWITCH OPEN
PRESSURE SWITCH IS CLOSED BEFORE VENTER IS
ENERGIZED
INTERNAL CONTROL FAULT OR NO POWER
YELLOW LED
FLAME SENSEDSTEADY ON
SLOW FLASH WEAK FLAME
UNDESIRED FLAME (VALVE OPEN & NO CALL FOR HEAT)FAST FLASH
IND
BK
NEUTRAL
W
MOTOR
LED
OKFLAME
GY
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
GAS VALVE
BL
BR
P1-2
P1-4
BL
24V
115/208/230
Y
BK
BR
R
L1 NEUTRAL NEUTRAL L1COMSEC
SYSTEM TRANSFORMER
EAC/BLO
W
WIRING
OF VENTER ENERGIZED
VOLT
BK
ATO OR ATC
3.0 AMP
C
R
W
G
Y
Y
PR
P3-4
P3-3
P3-2
TEST
NORMAL OPERATION NO CALL FOR HEATSTEADY 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
(MODELS 30-125 ONLY)
P3-5
P3-1
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 SECOND STAGE ANTICIPATOR AT 0.6 AMPS. AND FIRST
W
5. LOW STAGE OF THERMOSTAT CALLS FOR HEAT, ENERGIZING THE FAN MOTOR.
9. JUMPER THERMOSTAT TERMINALS G TO W1 AND RH TO RC IF FAN CONTROL FROM
THERMOSTAT FAN SWITCH IS DESIRED.
STAGE ANTICIPATOR AT MINIMUM.
Q674C SUBBASE (SEE NOTES #8 AND #9)
(OPT CL18) T874F THERMOSTAT
RH
W2
W2
W1
R
G
W1
TERMINAL STRIP
G
FUSE
RC
DOOR INTERLOCK
(UDAS ONLY)
R R
DISCONNECT SWITCH
(UDAS ONLY)
BK BK
WD# 185306 REV#2
UDAP & UDAS SERIES
23. Wiring Diagrams (cont’d)