46
Donaldson Company, Inc. © 1995
A. Blower motor does not
start.
B. Blower motor starts, but
does not keep running.
1. Wiring.
a. Proper wire size not
used for motor.
b. Not wired correctly.
c. Unit not wired for
available voltage.
d. Input circuit down.
e. Electrical supply circuit
down.
1. Starter kicks out.
a. Incorrect starter
overload relay is
installed.
b. Collector access panels
are off or not closed
tight.
c. Blower damper control
not adjusted properly.
1a. Rewire per local and
national codes for proper
wire size.
1b. Check and correct internal
motor wiring for proper
connections for your
voltage (reference Motor
Manufacturer Wiring
Diagram on motor).
1c. Correct wiring for proper
input voltage.
1d. Check input to motor
circuits for voltage on all
leads.
1e. Check the electrical supply
circuit for proper output
voltage or fuse, circuit
breaker fault. Replace if
necessary.
1a. Check for proper motor
starter overload relay.
Replace with proper value
overload relay if needed.
1b. Tighten access panel(s) by
hand securely (see Figure 1
SDF-4 Phantom View and
Section 6.2 Filter Element
Installation located in this
manual).
1c. Check airflow in ducting
for proper requirements.
Adjust the damper control
until the proper airflow is
achieved and the blower
motor amperage draw is
within manufacturer motor
ratings.
7.0 Troubleshooting Guide
TROUBLE POSSIBLE CAUSE REMEDY
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