Lennox EL180UHE Series Manual page 18

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 upstream
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" termi­
nals 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
FIGURE 14
Page 18
Multi−Meter
(set to VAC)
12 12
0 0
Multi−Meter
(set to VAC)
24