Thomas & Betts Comprehensive Guide for Betts Valve and Reznor UDAP 125 Wiring Diagrams

FIGURE 15C - Typical Wiring Diagram for Model UDAP or Model UDAS, Two Stage Gas Valve

		W1
CL7) T874F THERMOSTAT	SUBBASE (SEE NOTE #8)	R
(OPT Q674G		W2

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

30 VA

SYSTEM TRANSFORMER

Y

R

24V	115/208/230 VOLT
BR

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)

	PR			P3-1
W1	Y			P3-2
				P3-3
		DOOR INTERLOCK
R	R	(UDAS ONLY)	R	P3-4

SEC

Y

G

W AMP3.0

R

COM

FUSE

ATO OR ATC

L1 NEUTRAL NEUTRAL L1

NEUTRAL	W
		FAN MOTOR
EAC/BLO	BK	BK	W
			G
		BR	BR/W

(OPT	Q674CSUBBASE	RH
		RC
		W2

				P3-5
		LIMIT CONTROL		P1-8
W2		R	R
	O	R	R	P1-3
		FLAME ROLLOUT
		(MODELS 30-125 ONLY)

C		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
	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

CAPACITOR (SEE NOTE #6)

ALT.

HONEYWELL

TWO STAGE

GAS VALVE

MV BL

LOW		STG
	C	BR
HIGH		STG

OHI

			Y	P1-6
HONEYWELL		PRESSURE SWITCH		P1-5
		Y	Y
TWO STAGE
GAS VALVE
	LO	BL		P1-4
LOW	STG	BR		P1-2
	C
HIGH	STG	FLAME	R	P1-7
		ELECTRODE
O	HI		BR P1-9

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)
FAN OFF DELAY			TEST		IND	BK
							VENTER
TIME	S W
	1	2					MOTOR
90	OFF	ON	FLAME	OK	NEUTRAL	W	W	BK
			LED	LED
120	OFF	OFF							G
160	ON	OFF	Y	G
							BR/W	BR
180	ON	ON

	SPARK	CAPACITOR
	TRANSFORMER
DSI CONTROL		(SEE NOTE #7)

FLAME	SPARK GAP
GROUND

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

		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

150-400 AND 208/230V MODELS 100-400.

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 RZ-NA I-UDA, Mfg #195673 Rev 5, Page 25