Lennox SLP99UHV Series Unit Information page 37

BLOWER B3 HARNESS CONNECTORS
SHAFT
MOTOR with INTEGRATED
CONTROLLER
P48 5 Pin
P49 4 Pin
1
2
J48 Connector
installed on motor
P49 4 Pin
24v Transformer
FIGURE 10
Troubleshooting Motor Windings
Ensure that motor windings are not damaged by perform-
ing the following tests:
NOTE - If your ohm meter is not an auto-ranging type, set
it to the highest ohm scale (100k ohms or greater) before
performing tests.
P48 5 Pin
P49 4 Pin
3
4
J48 Connector
5
120v
240v
0
J49 Connector
Scale
2M two megohm - two
200k two hundred kilohm
thousand ohms
20k twenty kilohm --
twenty thousand
2k two kilohm -- two
thousand ohms
200 two hundred ohm
Measure the resistance between each of the three motor
leads (3-pin plug) and the unpainted part of the end shield.
If the winding resistance to ground is <100k ohms,
replace the motor and control module. If the resistance
to ground is >100k, the motor
Proceed to Test B.
Page 37
TABLE 17
Ohm Meter Range
Measurement Range
In Words
0 - 2,000,000
million ohms
0 - 200,000
- two hundred
0-20,000
ohms
0 - 2,000
FIGURE 11
TEST A
windings are fine.
Test A
FIGURE 12
ohms
0 - 200