Beckett 24 VDC manual Burner Wiring, Electrical Shock Hazard Explosion, Fire, Scald Burn Hazard

Section: Burner Wiring

Burner Wiring

Electrical Shock Hazard

Explosion, Fire, Scald, &

Burn Hazard

All heating equipment must have HIGH LIMIT controls to protect against excessive temperature and/or pressure. The control must interrupt electrical power and shutdown the

burner, if operating or safety controls fail and cause a runaway condition.

yFollow the equipment manufacturer’s wiring diagrams and note all required safety controls.

yTypical safety controls include high temperature or pressure limits, low water cutoffs, pressure relief valves and blocked flue sensing switches.

yVerify all limit and safety controls are installed and functioning correctly, as specified by the manufacturer, applicable safety standards, codes and all authorities having jurisdiction.

yEnsure the equipment is free of oil and oil vapor before starting or resetting the burner.

Electrical shock can cause severe personal injury or death.

yRemove all jewelry, such as rings and watches before performing service.

yDisconnect electrical power before installing or servicing the burner.

yProvide ground wiring to the burner, metal control enclosures and accessories. (This may also be required to aid proper control system operation.)

A. Burner installed on equipment

Refer to appliance manufacturer’s wiring diagram for electrical connections. Refer to “Maintain & Service Burner” section near the end of this manual.

B. Burner Replacement

Burner wiring may vary, depending on the actual primary control and furnished options. Refer to Figure 6 for typical burner wiring.

yDo not wire power directly to the burner motor. Only wire the motor as shown in Figure 6. If instant burner heat is required by the application, purchase or program a control with a long motor-off delay time, which will ensure instant heat if a new call for heat is received within the motor-off delay time.

Figure 6. Wiring with 7559 Control

Variations to the burner circuits may occur due to optional temperature, pressure, and vacuum switches that control burner

operation. Note that when external switches are used to control motor operation they must be sized correctly for the rated current or a relay should be installed to isolate the switches from the motor’s full load current.

Notes:

1.Wires are to be sized to prevent a voltage drop between the battery and the burner with the burner running at full load.

2.Fuse Sizes(inside control):

Motor = 20 Amp; Igniter, Control, Valve, & Alarm = 7.5 Amp

3.Hard-wire burner ground to battery. Do NOT use chassis ground system.

4.Input power to the control’s +24 volt wire shall be provided from a fused service switch, rated at 50 amps or less.

5.Motor-off delay on a 7559P will be disabled if the safety and operating limits as shown in Figure 6 interrupt power to the control’s red +24 volt wire.

6.Do not wire power directly to the burner motor. Only wire the motor as shown in Figure 6. If instant burner heat is required by the application, purchase or program a control with a long motor-off delay time, which will ensure instant heat if a new call for heat is received within the motor-off delay time.

MAIN POWER 24V

OIL
VALVE		ALARM
		VALVE
		GND (VLV)
IGNITER		IGNITER
		GND (IGN)
		MOTOR
MOTOR		GND (MTR)
HIGH		CAD
ON/OFF/RESET LIMIT		CELL
	RED WIRE	CAD CELL
	BLACK WIRE	ENABLE
		THERMOSTAT

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