Space Ray LTU Series Two Stage - Manual (Page 30)

Form #42710010
-28- May 2013
20.0) TROUBLESHOOTING GUIDE
T
urn on line volt
age.
Does the green monitoring light come on in the control cabinet?
Y
es
No
Is there 120V between the L1 and L2 terminals on the terminal block in the control cabinet?
Y
es
No
Are the black lead wires of the green light securely on the terminals L1 and L2?
No
Y
es
Replace the green light.
Rep
air connection.
Check line volt
age
curcuit. Rep
air fault.
Adjust thermost
at to
the highest setting. Is the draf
t inducer
on?
Y
es
No
Is one lead wire of the draf
t inducer motor
securely on the terminal L2 in the control cabinet?
No
Y
es
Rep
air connection.
Is the other lead wire of the draf
t inducer
motor securely on the relay terminal 3 in the control cabinet?
Does the red monitoring light come on in the control cabinet?
Y
es
No
Rep
air connections.
Is the air hose securely connected to the air switch and the air sensing tubing at the draf
t inducer?
No
Clean out hose and probe.
T
roubleshooting
continued on the next page.
No
Y
es
Rep
air connection.
Disconnect the power and check motor lead wires.
Any wire
broken?
Y
es
No
Rep
air broken wires.
Check the blower wheel. Does it turn freely?
Y
es
Replace motor Check blower wheel. Is there any damage?
Replace blower wheel.
Readjust blower wheel on shaf
t &
retighten set crew
.
Check the air sensing tube and hose.
Are
they clear and unobstructed? Check the pressure at the air switch. Is it higher than the minimum required?
Rest
art
troubleshooting.
Is one red wire securely connecting relay terminal 5 and terminal C of the air switch in the control cabinet?
Y
es
Y
es
No No
Y
es
No
Check the volt
age
between air switch terminal C and ground, is it 24 vac?
Y
es
Y
es
When the draf
t
inducer is running, is there 24 vac between air switch terminal NO and ground ?
No
Correct connection.
Is one lead wire of the red light securely connected to one transformer terminal along with two other white wires? Correct connection.
Y
es
Y
es
No
Y
es
Y
es
Replace the air switch.
No
Check the air int
ake
and vent.
Are there
any blockages?
Y
es No
Remove blockage. Rest
art
troubleshooting.
Is the other lead wire of the red light securely connected to terminal NO of the air switch along with a red wire from ignition module? Is there 120V between terminal L2 and relay terminal 3?
No
Y
es
See sequence continued on the next page.
1
No
No
Correct connection.
No
See sequence continued on the next page.
2
Replace the red light.