Beckett ADC manual Drive Component Maintenance, Motor, Blower Wheel, and Coupling Replacement

Section: Drive Component Maintenance

Figure 6C. Typical Wiring with 7556 Primary Safety Control

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 = 30 Amp

Igniter, Control, Valve, & Alarm = 10 Amp

3. Hard-wire burner ground to battery. Do NOT

use chassis ground system.

4. Input power to the control’s +12 Volt wire shall

be provided from a fused service switch, rated at

50 amps or less.

5. Motor-off delay on a 7556P will be disabled

if the safety and operating limits as shown in

Figure 6C interrupt power to the control’s red

+12 Volt wire.

6. Do not wire power directly to the burner motor.

Only wire the motor as shown in Figure 6C. 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.

7. Igniter Yellow leads are capped and not used.

Bundle with the other leads in the wiring box with

OIL

VALVE

IGNITER

Note 7

Note 8

MOTOR

HIGH

ON/OFF/RESET LIMIT

RED WIRE

BLACK WIRE

ALARM

VALVE

GND (VLV)

IGNITER

GND (IGN)

MOTOR

GND (MTR)

CAD

CELL

ENABLE

SK10089

CAD CELL

a cable tie.

8. The igniter Blue-White striped

and solid White leads are combined	MAIN
with the 3274001 “Y” connector	POWER
and attached to the primary control	24V
igniter spade terminal.

THERMOSTAT

Drive Component Maintenance

A. Motor, Blower Wheel, and Coupling Replacement

8.Slide the blower wheel toward the motor until it contacts the feeler gauge.

9.Rotate the blower wheel until the setscrew is centered on the flat of the motor shaft. Tighten the setscrew to secure the wheel.

10.Slide the motor coupling on the motor shaft, then install the motor on the burner housing. Ensure that

The motor will require replacement if the proper voltage is	the motor coupling fits between the motor shaft and
measured at the motor input, and the motor will either not	the pump shaft inside the housing. Tighten the motor
run, or the current draw with a free running pump exceeds	retaining screws. Reconnect the wires.
10% of the rated current.	11. Restore power, start the burner and perform

To replace the burner motor, coupling and/or blower wheel perform the following steps.

1.Before servicing, turn off and/or disconnect all power to the burner.

2.Disconnect the burner motor wires.

3.Remove the bolts securing the motor to the burner housing.

4.Remove the motor, coupling, and blower wheel.

5.Loosen the set screw on the blower wheel to slide the existing wheel off the shaft.

6.Slide the new blower wheel onto the old shaft (after thoroughly cleaning housing) and/or slide the old blower wheel onto the new motor shaft.

7.Place a .030” (1/32” ± 1/64”) feeler gauge between the blower wheel and the motor housing.

the combustion test described previously in this manual.

Figure 7. – Blower Wheel

Insert feeler	Flat face on
	motor shaft
gauge
between
blower and
motor

Access hole to set screw

12 Vdc ADC Burner Manual

9