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. |
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. |
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 |
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 |
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
