BAS-SVX084A-EN
67
Troubleshooting
•
If the Symbio 210 controller is calling for the fan to be ON (viewed in the Status screen), and
it is not, then check the TRIAC output wiring and relay output
–
Check BO to common
. It should have 24 Vac. If it does not, measure the power input to
on XFMR 24 Vac input and
of the Symbio 210 controller. The supply voltage should be
between 20.4 and 27.6 Vac (24 Vac catalogued). However, voltages at either extreme may
result in system instability.
–
TRIACs can be checked by using a 24 Vac load such as relay, led, or actuator. Connect the
wires of the load to the triac outputs on controller. Raise setpoint to initiate call for heat. If
the Symbio 210 BO LEDs are lit, but the load doesn't change state, replace controller.
Note:
Measuring the output voltage with a meter is not a reliable test for TRIAC output
voltage. The TRIAC output requires a small amount of current draw in order to fully
switch 24 Vac to ground. The LED provides the required current draw.
–
Remove fan wires from the Symbio 210 controller and apply 24 Vac directly to fan relay
wires.
–
Fan relay should energize. If it does not energize, check wiring. If the wiring check is good,
replace fan relay.
•
After all checks have been completed, check motor fan winding integrity and bearing failure.
PSC (Permanent Split Capacitor) Variable Speed Motor Check
If the PSC Variable speed motor control does not change the motor speed, check the following:
•
Wires connected improperly. Refer to the section,
“Appendix: Typical Trane Factory Wiring
.
•
Check voltage selection switch on side of variable speed motor control. It should be set for
motor voltage.
•
Check speed control by:
–
Turning the voltage selection switch fully counterclockwise.
–
Turning the motor speed control potentiometer fully counterclockwise.
–
Ensuring the motor remains OFF.
•
Turn voltage selection switch fully clockwise, but:
–
The motor speed control potentiometer still remains fully counterclockwise.
–
Measure the motor voltage. It should be no more than 8 Vac lower than line voltage.
–
The voltage selection switch still remains fully clockwise.
NOTICE
Equipment Damage!
The Symbio 210 controller outputs are switched to ground. Do not jumper 24 Vac to binary
output TRIAC(s) because damage will occur.
WARNING
Live Electrical Components!
During installation, testing, servicing and troubleshooting of this product, it may be necessary
to work with live electrical components. Have a qualified licensed electrician or other
individual who has been properly trained in handling live electrical components perform these
tasks. Failure to follow all electrical safety precautions when exposed to live electrical
components could result in death or serious injury.
