FIGURE 15C - Typical Wiring Diagram for Model UDAP or Model UDAS, Two Stage Gas Valve
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CL7) T874F THERMOSTAT | SUBBASE (SEE NOTE #8) | R |
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(OPT Q674G | W2 | |
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| FACTORY WIRING |
| FIELD WIRING |
| OPTIONAL FACTORY |
STRIP | WIRING |
WIRE NUT | |
TERMINAL |
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G |
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30 VA
SYSTEM TRANSFORMER
Y
R
24V | 115/208/230 VOLT |
BR |
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BK
SW1
W
LINE/1/60
| BK |
SWITCH ONLY) | |
DISCONNECT | BK |
| (UDAS |
G
GRD
SCREW
G
G
| G |
T874F THERMOSTAT | W1 |
(SEE NOTE #8AND#9) | |
CL18) |
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W1 |
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| DOOR INTERLOCK |
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R |
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SEC
Y
G
W AMP3.0
R
COM
FUSE
ATO OR ATC
L1 NEUTRAL NEUTRAL L1
NEUTRAL | W |
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| FAN MOTOR | |
EAC/BLO | BK | BK | W |
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| G |
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| BR | BR/W |
(OPT | Q674CSUBBASE | RH |
RC | ||
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| LIMIT CONTROL | ||
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W2 | R | R | |||||
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| O | R | R | |
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| FLAME ROLLOUT |
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C | LED FLASH CODES | ||||||
| GREEN LED | ||||||
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| STEADY ON | NORMAL OPERATION NO CALL FOR HEAT | |||||
| FAST FLASH | NORMAL OPERATION CALL FOR HEAT | |||||
| 1 FLASH | IN LOCKOUT FROM FAILED IGNITIONS OR FLAME | |||||
| 2 FLASH | PRESSURE SWITCH DOES NOT CLOSE WITHIN | |||||
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| 30 SECONDS OF VENTER ENERGIZED | |||
| 3 FLASH | LIMIT SWITCH OR ROLLOUT SWITCH OPEN | |||||
| 4 FLASH | PRESSURE SWITCH IS CLOSED BEFORE | |||||
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| VENTER IS ENERGIZED | |||
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CAPACITOR (SEE NOTE #6)
ALT.
HONEYWELL
TWO STAGE
GAS VALVE
MV BL
LOW |
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| C | BR |
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HIGH |
| STG |
OHI
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HONEYWELL | PRESSURE SWITCH | ||||
Y | Y | ||||
TWO STAGE |
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GAS VALVE |
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| LO | BL |
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LOW | STG | BR |
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HIGH | STG | FLAME | R | ||
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ELECTRODE |
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O | HI |
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STEADY OFF INTERNAL CONTROL FAULT OR NO POWER |
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| YELLOW LED |
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STEADY ON | FLAME SENSED |
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SLOW FLASH WEAK FLAME |
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FAST FLASH | UNDESIRED FLAME (VALVE OPEN & NO CALL |
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| FOR HEAT) |
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FAN OFF DELAY | TEST | IND |
| BK |
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| VENTER | ||||||||
TIME | S W |
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1 | 2 |
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| MOTOR | |||
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90 | OFF | ON | FLAME | OK | NEUTRAL |
| W | W | BK | |
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120 | OFF | OFF |
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160 | ON | OFF | Y | G |
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| BR/W | BR | ||||||
180 | ON | ON |
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| SPARK | CAPACITOR | |
| TRANSFORMER | ||
DSI CONTROL | (SEE NOTE #7) | ||
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FLAME | SPARK GAP | |
GROUND | ||
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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.
8.HIGH STAGE OF THERMOSTAT CALLS FOR HEAT, FIRING UNIT AT FULL RATE.
9.SET FAN SWITCH AT "ON" POSITION FOR CONTINUOUS FAN OPERATION, OPTION CL18 ONLY.
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).
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
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| FIELD CONTROL WIRING |
TOTAL WIRE |
| DISTANCE FROM |
LENGTH |
| UNIT TO CONTROL |
150' | 75' | |
250' | 125' | |
350' | 175' |
WIRING CODE
BLACK - BK
BROWN - BR
RED - R
ORANGE - O
YELLOW - Y
GREEN - G
BLUE - BL
PURPLE - PR
WHITE - W
MIN. RECOMMENDED
WIRE GUAGE
#18 GA. WIRE #16 GA. WIRE #14 GA. WIRE
7.CAPACITOR IS REMOTE MOUNTED AND INCLUDED ONLY ON MODELS 150 - 400.
8.SET THERMOSTAT FIRST STAGE ANTICIPATOR AT 0.6 AMPS AND SECOND STAGE ANTICIPATOR AT 0.2 AMPS.
9.JUMPER THERMOSTAT TERMINALS RH TO RC.
UDAP & UDAS SERIES WD# 185244 REV #3 AG2
Form