Thomas & Betts UDAS, UDAP dimensions Wiring Diagrams cont’d

23. Wiring Diagrams (cont’d)

FIGURE 15B - Typical Wiring Diagram for Model UDAP or Model UDAS, Single Stage with Optional Air Recirculation

	FACTORY WIRING
	FIELD WIRING
	OPTIONAL FACTORY
STRIP	WIRING
	WIRE NUT
TERMINAL
G

30 VA

SYSTEM TRANSFORMER

	Y
R	115/208/230 VOLT
24V
BR
	BK
	SW1

W

LINE/1/60

SWITCH	BK
	ONLY)
DISCONNECT	BK
	(UDAS

G

G

G

GRD

SCREW

THERMOSTAT NOTES #8 AND #9)

W1

G

W2

	PR	P3-1	Y
W1	Y	P3-2	G

SEC COM L1 NEUTRAL NEUTRAL L1

NEUTRAL	W
		FAN MOTOR
EAC/BLO	BK	BK	W

(OPT CL18) T874F Q674C SUBBASE (SEE

RH

RC

					P3-3	W
		DOOR INTERLOCK
	R	(UDAS ONLY)		R	P3-4
R						R
					P3-5	C
W2		LIMIT CONTROL			P1-8
		R	R
		R	R		P1-3
		FLAME ROLLOUT
	(MODELS 30-125 ONLY)
				Y	P1-6
			PRESSURE SWITCH		P1-5
			Y	Y

3.0 AMP	ATO OR ATC FUSE
	LED FLASH CODES
	GREEN LED
STEADY ON	NORMAL OPERATION NO CALL FOR HEAT
FAST FLASH	NORMAL OPERATION CALL FOR HEAT
1 FLASH	IN LOCKOUT FROM FAILED IGNITIONS OR FLAME LOSSES
2 FLASH	PRESSURE SWITCH DOES NOT CLOSE WITHIN 30 SECONDS
	OF VENTER ENERGIZED
3 FLASH	LIMIT SWITCH OR ROLLOUT SWITCH OPEN
4 FLASH	PRESSURE SWITCH IS CLOSED BEFORE VENTER IS
	ENERGIZED
STEADY OFF	INTERNAL CONTROL FAULT OR NO POWER
	YELLOW LED
STEADY ON	FLAME SENSED
SLOW FLASH	WEAK FLAME
FAST FLASH	UNDESIRED FLAME (VALVE OPEN & NO CALL FOR HEAT)

G

BR BR/W

CAPACITOR (SEE NOTE #6)

	BL	P1-4	FAN
GAS VALVE			TIME
BL	BR	P1-2	90
			120
FLAME		P1-7	160
	R		180
ELECTRODE
	BR	P1-9
FLAME
GROUND

OPERATING SEQUENCE

1.	SET THERMOSTAT AT LOWEST SETTING, FAN SWITCH AT "AUTO" POSITION.
2. TURN ON MANUAL GAS VALVE.

OFF DELAY
OFF	ON
OFF	OFF
ON	OFF
ON	ON

DSI CONTROL

TEST		IND	BK
				VENTER
				MOTOR
FLAME	OK	NEUTRAL	W	W	BK
LED	LED
Y	G				G
				BR/W	BR
		SPARK		CAPACITOR
		TRANSFORMER
				(SEE NOTE #7)

SPARK GAP

FIELD CONTROL WIRING

3.	TURN ON POWER TO UNIT.
4.	SET THERMOSTAT AT DESIRED SETTING.
5.	LOW STAGE OF THERMOSTAT CALLS FOR HEAT, ENERGIZING THE FAN MOTOR.
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).

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.

8.SET THERMOSTAT SECOND STAGE ANTICIPATOR AT 0.6 AMPS. AND FIRST STAGE ANTICIPATOR AT MINIMUM.

9.JUMPER THERMOSTAT TERMINALS G TO W1 AND RH TO RC IF FAN CONTROL FROM THERMOSTAT FAN SWITCH IS DESIRED.

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

UDAP & UDAS SERIES

WD# 185306 REV#2

MIN. RECOMMENDED

WIRE GAUGE

#18 GA. WIRE #16 GA. WIRE #14 GA. WIRE

Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 24