Honeywell Replacing RA890E,F,G with R4795A, R4795C Replacement, Flame Detector Wiring

R4795A

INSTALLATION

Replacing RA890E,F,G with R4795A

1.Disconnect all wires from terminal 1, and splice with solderless connector. (If RA890 has no terminal 1 wiring, disregard this step.)

2.Remove line voltage controller wire from terminal 6 and connect to terminal 1.

3.Move burner motor connection from terminal 3 to ter- minal 6 on subbase.

4.Remove jumper from T and T and install air switch. If low voltage control was wired to RA890 T-T, remove low voltage control and install line voltage control as shown in Fig. 4.

5.If R482D Relay was used with RA890E, remove it. The R482D is redundant when R4795D is used.

6.Check for proper operation through at least two cycles.

Fig. 4—Replacing RA890E,F,G with R4795A on gas or oil burner.

REPLACING RA890 WITH R4795 ON GAS OR OIL BURNER

R4795C Replacement

In most cases, the R4795A can directly replace the R4795C. For standing pilot applications where the pilot flame was detected during the off cycle, install a relay as shown in Fig. 5.

Flame Detector Wiring

See Fig. 6.

Alarm Contacts

Models with alarm contacts have three male quick-con- nect terminals. Three female quick-connect terminals are provided for field installation. To connect leadwires to the female quick-connects, strip 1/4 inch (6.4 mm) insulation from end of leadwire; insert into the quick-connect, and crimp securely with a crimping tool. Fig. 7 shows proper alarm terminal connections.

If a line voltage alarm is used with the R4795, mount the entire control in a suitable enclosure.

		Fig. 5—When R4795A replaces R4795C in a
BEFORE		standing pilot application, install relay 1R to
CONTROLLER HIGH LIMIT		prevent detection of pilot flame during burner
	MAIN GAS
		off cycle.
	VALVE OR
	2ND STAGE
	OIL VALVE

		6		5
				IGNITION
		T		TRANSFORMER						MIAN FUEL
				4		BURNER			5
								8		VALVES
				BURNER		MOTOR			2K3
		T		MOTOR
				3					4
FLAME				PILOT OR				7	2K2
		F		OIL VALVE
DETECTOR					L1
									3
				1	(HOT)					1R
						AIR FLOW
									1K4
		G			120V			6
						SWITCH
				2	L2
		RA890 WITH Q270					1R1		3K2
								F
						TO FLAME			FLAME
AFTER						DETECTOR			AMPLIFIER
								G
	CONTROLLER		HIGH LIMIT
						(FLAME ROD
				MAIN GAS					1	CONTROLLER
						OR UV
				VALVE OR
				2ND STAGE		DETECTOR)
				OIL VALVE					3
	6	8		5					2
										LIMIT(S)	2
				IGNITION
AIR FLOW				TRANSFORMER				R4795A
	T	7		4
SWITCH
				BURNER
	T	6		MOTOR
				3						1
		SODERLESS		PILOT OR					L2	L1
										(HOT)
FLAME
	F	CONNECTION		OIL VALVE
DETECTOR					L1	1	POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
							PROTECTION AS REQUIRED.
					(HOT)
				1
	G				120V	2	REFER TO SPECIFICATIONS SECTION FOR RECOMMENDED LIMITS.
		RA4795 WITH Q270		2	L2	3	LOW VOLTAGE CIRCUIT OMITTED.				M8685
					M8684

60-2285—7 6