Master Lock B100CEH, B70CEH, B35CEH, B150CEH Fan, Ignition Control Assembly, Remove Old Assembly

OWNER’S MANUAL

SERVICE

PROCEDURES

Continued

FAN

IMPORTANT: Remove fan from motor shaft before removing motor from heater. The weight of the motor resting on the fan could damage the fan pitch.

1.Remove upper shell (see page 8).

2.Use 1/8" allen wrench to loosen set- screw which holds fan to motor shaft.

3.Slip fan off motor shaft.

4.Clean fan using a soft cloth moistened with kerosene or solvent.

5.Dry fan thoroughly.

6.Replace fan on motor shaft. Place fan hub flush with end of motor shaft (see Figure 28).

7.Place setscrew on flat of shaft. Tighten setscrew firmly 4.5 to 5.6 N-m (40 to 50 in-lbs).

8.Replace fan guard and upper shell.

Fan

Setscrew

Motor

Shaft

Figure 27 - Fan, Motor Shaft, and Setscrew Location

Fan

Flush

Motor

Shaft

Setscrew

IGNITION CONTROL

ASSEMBLY

WARNING: Unplug heater before servicing.

Remove Old Assembly

1.Using the 5/16" nut driver or socket wrench, remove the four side cover screws (see Figure 29).

2.Disconnect the nine wires from the ignition control assembly.

3.Using needle nose pliers, squeeze the tab on the printed circuit board support and lift up on the edge of the ignition control assembly (see Figure 30). Repeat this for the other four printed circuit board sup- ports then remove the assembly.

Side

Cover

Figure 29 - Removing Cover

Side Cover

Ignition
Control	Printed Circuit
Assembly	Board Supports (5)

Figure 30 - Removing Circuit Board

Installing the New Assembly

CAUTION: Ignition control assembly contains electrostatic components. Handle the assem- bly by the edges of the printed circuit board. Do not touch any of the quick connect terminals or electronic components.

1.Align the five holes in the assembly with the five printed circuit board sup- ports in the side cover.

2.Holding the assembly by the edges of the printed circuit board, apply down- ward pressure until all five tabs on the printed circuit board supports springlock into place. Pull up on assembly to verify this (see Figure 31).

3.Connect the nine wire leads to the ignition control assembly as shown in the wiring diagram on page 23.

CAUTION: Double check connections. Connecting igni- tion control assembly wrong could result in damage to the ignition control assembly and/ or other components in the heater assembly.

4.Using the 5/16" nut driver or socket wrench reinstall side cover to heater. Tighten screws until snug. Do not over torque!

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Figure 31 - Attaching Circuit Board to Tabs

Figure 28 - Fan Cross Section

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