Lennox EL180UHNE Series Unit Information page 15

P49
5
4
3
2
1
N
G
L
C
Test 1
Turn on power to unit. Check for 120 volts across terminals
"L" and "N" on input plug P48. If voltage is present continue
to test 2. If voltage is not present problem may be may be up­
stream of plug P48 and proceed to test 3.
P49
5
4
3
2
1
N
G
L
C
P48
Test 2
Switch thermostat to CONTINUOUS FAN MODE. Check for
24 volts across terminal "C" on inpult plug P48and speed tap
used for continuous fan. (1, 2, 3, 4 or 5) on input plug P49. If
24 volts is not present problem may be up stream of plug P49.
Proceed to test 4.
Multi−Meter
(set to VAC)
12 12
0 0
P48
Multi−Meter
(set to VAC)
24
Test 3 (if necesssary)
Check for 120 volts across terminals "CIRC" and "Neutrals"
on the integrated control. If voltage is present, problem is
with the harness. If voltage is not present problem may be
may be with the integrated control.
Test 4 (if necessary)
Check for 24 volts across terminals "24 COM" and "FAN" ter­
minals on the integrated control. If voltage is present, prob­
lem is with the harness. If voltage is not present problem
may be may be with the integrated control
FIGURE 12
Page 15
Multi−Meter
(set to VAC)
12 12
0 0
Multi−Meter
(set to VAC)
24