Master B 70 CEL Bedienungsanleitung Seite 13

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 7).
2.Use 1/8" allen wrench to loosen setscrew 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 fl ush with end of
motor shaft (see Figure 28).
7. Place setscrew on fl at of shaft. Tighten setscrew fi rmly 4.5 to
5.6 N-m (40 to 50 in-lbs).
8. Replace fan guard and upper shell.
A.
C.
B.
A.Fan, B.Motor shaft, C.Set screw, D. Flush.
Figure 27 – Fan, motor shaft
and setscrew location.
IGNITION CONTROL ASSEMBLY
fl
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 supports then remove the assembly.
A.
D.
B.
C.
Figure 28 – Fan
section.
A.
Figure 29 – removing cover.
B.
A.
Figure 30 – Removing circuit board
Installing the New Assembly
fl
CAUTION: Ignition control assembly contains
electrostatic components. Handle the assembly by the
edges of the printed circuit board. Do not touch any of
the quick connect terminals or electronic components.
1. Align the fi ve holes in the assembly with the fi ve printed circuit
board supports in the side cover.
2.Holding the assembly by the edges of the printed circuit
board, apply downward pressure until all fi ve tabs on the
printed circuit board supports springlock into place. Pull up on
assembly to verify this (see Figure 31).
cross
3.Connect the nine wire leads to the ignition control assembly as
shown in the wiring diagram on page 17.
fl
CAUTION: Double check connections. Connecting
ignition 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!
A.
Figure 31 – Attaching Circuit Board toTabs.
SERVICE PROCEDURES
A. Side cover
A. Side cover
B. Ignition Contro l As-
sembly
C. Printed Circuit
Board Supports (5)
C.
A. Unacceptable
B. Acceptable
B.
11
GB