Honeywell R4795A specifications Wiring Hookups, Retrofitting R4795

IMPORTANT: Do not run high voltage ignition trans- former wires in the same conduit with the flame detector wiring.

5.For ignition installations in a contaminating environ- ment, use Honeywell Specification no. R1239001 High Ten- sion Ignition Cable or equivalent. This wire is very resistant to severe conditions of oil, heat, and corona, and is tested to withstand high voltages up to 25,000V rms in a salt bath for one minute without breakdown. It is rated at 200°F (93°C) for continuous duty and up to 350°F (75°C) for intermittent use.

Wiring Hookups

The typical wiring hookups in Fig. 2 and 3 show the internal line voltage schematic. Contact 3K2 closes when the controller calls for heat. 1K4 closes when prepurge is com- plete. 2K2 breaks and 2K3 makes when flame is proven. Also see the Operation section.

Fig. 2—Wiring hookup of gas system with interrupted ignition and intermittent pilot.

BURNER		5	MAIN FUEL
	8		VALVE(S)
MOTOR		2K3
AIR FLOW		4	IGNITION	2
	7
SWITCH		2K2
	6	3	PILOT
			VALVE
		1K4
		3K2
TO FLAME	F
DETECTOR		FLAME
(FLAME ROD
		AMPLIFIER
OR UV
	G
DETECTOR)		1	CONTROLLER
		2		3
			LIMIT(S)
		R4795A
			1
		L2	L1
			(HOT)

1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

2FOR INTERMITTENT IGNITION, CONNECT IGNITION TO TERMINAL 3.

3REFER TO SPECIFICATIONS SECTION FOR RECOMMENDED LIMITS.

M8682

R4795A

INSTALLATION

Fig. 3—Wiring hookup of oil system with interrupted ignition.

BURNER		5	2ND STAGE	4
	8		OIL VALVE(S)
MOTOR		2K3
AIR FLOW		4	IGNITION	2
	7
SWITCH		2K2
	6	3	1ST STAGE	3
			OIL VALVE(S)
		1K4
		3K2
	F
TO FLAME		FLAME
DETECTOR
		AMPLIFIER
(PHOTOCELL
	G
OR UV)		1	CONTROLLER
		2		5
			LIMIT(S)
		R4795A
			1
		L2	L1
			(HOT)

1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

2FOR INTERMITTENT IGNITION,CONNECT IGNITION TO TERMINAL 3.

3IMMEDIATE OPENING OIL VALVE V4046B.

4OPTIONAL DELAYED OPENING OIL VALVE V4046A OR V4046B WITH ST70A ELECTRONIC TIME DELAY.

5REFER TO SPECIFICATIONS SECTION FOR RECOMMENDED LIMITS.

M8683

Retrofitting R4795

CAUTION

Make wiring connections as specified in Fig. 2, 3, or 4. Do not simply plug the R4795 into the old subbase without first changing the wiring at the subbase.

Observe the following when retrofitting the R4795:

1.Requires a line voltage controller capable of switching the entire connected electrical load.

2.Delayed opening oil valve may be retained but its delay is not necessary. Integral ST71A Purge Timer meets the intent of a delayed opening valve.

3.Refer to Fig. 2, 3 or 4 for proper wiring connections.

5 60-2285—7