Thomas & Betts UDAP, UDAS dimensions Wiring Diagrams, Operating Sequence

23. Wiring Diagrams

FIGURE 15A - Typical Wiring Diagram for Model UDAP or Model UDAS, Single Stage

(OPT CL3) T874F OR (OPT CL1) W.R. 1C30-341 THERMOSTAT (SEE NOTE #8)

W

R

TERMINAL STRIP

G

FACTORY WIRING

FIELD WIRING

OPTIONAL FACTORY WIRING

WIRE NUT

30 VA

SYSTEM TRANSFORMER

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

W

LINE/1/60

	BK
SWITCH ONLY)
DISCONNECT	BK
	(UDAS

G

GRD

SCREW

G

G

(OPT CL2) W.R. 1C30-341 THERMOSTAT W-S23-6 SUBBASE (SEE NOTE #8)

G

W

R

W1

R

W2

PR				P3-1	Y
Y				P3-2	G
				P3-3	W
	DOOR INTERLOCK
R	(UDAS ONLY)		R	P3-4
					R
				P3-5	C
	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

SEC	COM	L1 NEUTRAL NEUTRAL	L1
		NEUTRAL		W
					FAN MOTOR
		EAC/BLO		BK	BK	W
AMP3.0	ATCORATO FUSE				BR	BR/W
						G
					CAPACITOR
	LED FLASH CODES				(SEE NOTE #6)
	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)

BL P1-4

FAN OFF DELAY

TEST

IND BK

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

S W 1

12

OFF ON

OFF	OFF
ON	OFF
ON	ON

DSI CONTROL

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

SPARK GAP

OPERATING SEQUENCE

1.SET THERMOSTAT AT LOWEST SETTING, (FAN SWITCH AT "AUTO" POSITION, OPTION CL2 ONLY).

2.TURN ON MANUAL GAS VALVE.

3.TURN ON POWER TO UNIT.

4.SET THERMOSTAT AT DESIRED SETTING.

5.THERMOSTAT CALLS FOR HEAT, ENERGIZING THE VENTER MOTOR.

6.VENTER PRESSURE SWITCH CLOSES, FIRING UNIT AT FULL RATE.

7.BURNER FLAME IS SENSED, AND IN 30 SECONDS THE FAN MOTOR IS ENERGIZED.

8.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).

9.SET FAN SWITCH AT "ON" POSITION FOR CONTINUOUS FAN OPERATION, OPTION CL2 ONLY.

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.

	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 GAUGE

#18 GA. WIRE

#16 GA. WIRE

#14 GA. WIRE

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 ANTICIPATOR AT 0.6 AMPS.

UDAP & UDAS SERIES

WD# 185139 REV #1 AG1

Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 23