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Troubleshooting
To verify motor operation see steps below:
1− Remove J48 (5 pin power plug) from P48 on the mo-
tor.
2− With the power on at the furnace and door switch de-
pressed, use a test meter to verify 120V between pins 4
and 5 on J48.
3− Reconnect J48 to P48 on the motor.
4− Remove J49 (4 pin low voltage connector) from P49
on the motor.
5− Using test jumpers, apply 24V to pins 3 and 4 on P49
on the motor.
Note:
Do not apply 24V to pins 2 and 4 on P49. Doing so
will cause permanent damage to the motor.
6− Motor should run at 75%.
7− Test is complete. Remove jumpers and reconnect
plugs.
Another option is to use the TECMate PRO motor tester
with the 16 to 4 pin adaptor. The use of the TECMate PRO
isolates the motor from the integrated control. Follow the
instructions provided with the kit. If the motor runs do not
replace.
C−Heating Components
1. Ignitor (Figure 11)
The SureLight
®
ignitor is made of durable silicon nitride. Ig-
nitor longevity is enhanced by controlling voltage to the igni-
tor. The integrated control provides 120 volts to the ignitor
for a consistent ignition. Due to this feature of the control,
voltage measured with a digital meter will be slightly lower.
To measure correct voltage use a true RMS meter or ignitor
can be ohmed. Ohm value should be 39 to 70.
2. Flame Sensor (Figure 11)
A flame sensor (figure 11) is located on the left side of the
burner support. The sensor is mounted on the flame rollout
plate and the tip protrudes into the flame envelope of the
left−most burner. The sensor can be removed for service
without removing any part of the burners. During operation,
flame is sensed by current passed through the flame and
sensing electrode. The SureLight control allows the gas
valve to remain open as long as flame signal is sensed. To
check flame sense signal use the push−button found on the
integrated control and go to Field Test Mode. The menu will
display the flame signal. Table 17 shows the flame signal for
the SLP98UHV unit.
TABLE 17
Flame Signal in Microamps
Normal
Low
Drop Out
2.6 or greater
2.5 or less
1.1
NOTE − A much higher than normal micro amp reading (15
for example) may appear when checking flame signal.
FIGURE 10
BLOWER B3 HARNESS CONNECTORS
MOTOR with INTEGRATED
CONTROLLER
SHAFT
P49 4 Pin
P48 5 Pin
P48 5 Pin
P49 4 Pin
J48 Connector
installed on motor
P49 4 Pin
120v
0
240v
5
4
3
2
1
J48 Connector
24v Transformer
J49 Connector
