Lesson 6: I.D. Fans

Question 1

1. What should be checked in the I.D. fan control panel before starting a fan?

Answer 1

Vibration Reset
Safe/Run in Run
Aux Oil Pump running

Question 2

2. What are the permissives to start an I.D. fan?

Answer 2

Vibration Reset
Breaker Racked In
Safe/Run in Run
Aux Oil Pump running (Heat and vibration)
Beck Drive Linkage at minimum
Scoop tube boot condition
Oil Level in Fluid Drive
Oil Level in Motor
Oil leaks
Air intakes clear
Grounding Strap
ACW Valved In (ACW leaks)
Air supply to Leslie Controllers
Outlet Damper linkage and in remote

Question 3

3. What should be checked on an I.D. fan after starting?

Answer 3

Oil Flow
Oil Pressure
Oil Reservoir Level
Oil Leaks
Oil Filter DP
Turn Cuno Filter
Main oil pump running
Air Intakes are clear
Slinger Ring has oil
Beck Drive Linkage and Boot condition
ACW valved in
ACW leaks
Air supply to Leslie Controllers
Outlet Damper linkage condition
Heat/Vibration on motor and fluid drive
Vibration Meter
Switch Aux .Oil Pump to Auto after a few hours

Question 4

4. What voltage are the I.D. fan motors?

Answer 4

6900 Volts

Question 5

5. What is the purpose of the fluid drive?

Answer 5

The Fluid Drive controls the speed of the ID Fan which allows the motor to operate at full load.

Question 6

6. What is the basic reason for an I.D. fan?

Answer 6

To keep a negative pressure on the boiler and to pull ash through the system.

Question 7

7. Explain the procedure to swap oil filters. What is the difference on Unit #1 oil filters?

Answer 7

Unit #1: Open the EQ valve first and switch the filters at low loads.
Unit #2&3: (at low load) Switch filter handle in continuous motion