508034-02
Issue 2135
Page 14 of 49
1
2
3
4
5
C
L
G
N
Multi−Meter
(set to VAC)
P48
P49
120
Turn on power to unit. Check for 120 volts across terminals
“L” and “N” on input plug P48. If voltage is present, continue
upstream of plug P48 and proceed to test 3.
1
2
3
4
5
C
L
G
N
Multi−Meter
(set to VAC)
P48
P49
24
Switch thermostat to CONTINUOUS FAN MODE. Check for
24 volts across terminal “C” on input plug P48 and 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)
24
Multi−Meter
(set to VAC)
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
with the integrated control.
Test 1
Test 2
Test 3 (if necessary)
Test 4 (if necessary)
to test 2. If voltage is not present, problem may be
120
Check for 24 volts across terminals “24 COM” and “FAN”
terminals on the integrated control. If voltage is present,
problem is with the harness. If voltage is not present,
problem may be with the integrated control.
Figure 17.