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BAS-SVX084A-EN
Troubleshooting
Trane/Honeywell Proportional Valve Check Out
There are two failures can result in over conditioning the space:
•
Cartridge failure
•
Actuator failure
Cartridge Failure
Cartridge failure will occur if the actuator is driven CLOSED, but there is an 1/8 inch or greater of
movement in the indicator, or if the piston has not returned up past the ‘A’ port (frozen). In either
case, the cartridge is not closed off completely which will result in over heating (or over cooling)
the space.
Actuator Failure
Actuator failure will occur if the actuator has stopped moving to the CLOSED position when
commanded to and when there is no play in the lever.
Remove the actuator and work the cartridge stem manually. If the stem moves freely, then only the
actuator has failed. However, if the stem is sluggish or stuck, then both the actuator and the
cartridge have failed.
Note:
The actuator fault is intermittent. However, the actuator may operate again when removed
from the valve or if it is tapped with a tool while still on the valve. The actuator indicator on
the side of the actuator should be positioned at the top of the actuator when valve is
CLOSED.
VAV 2-Position Hot Water Failure
In the event that the heat outputs do not energize, check the following:
•
Zone temperature is at or above the heating setpoint. Increase the Symbio 210 controller
heating setpoint.
•
Verify the output configuration in the Symbio 210 controller setup screen. Unit needs to be
configured as proportional hot water.
•
Tracer SC has the heat output disabled. Check overrides to ensure they are not inhibiting heat
operation.
•
Heat relays have failed.
–
The Symbio 210 controller will call for the valve to be OPEN, (viewed in the Status screen).
If not, check the TRIAC output, wiring connections, and relay output.
–
If the Symbio 210 controller is calling for the heat output to be ON (viewed in the Status
screen), then the LED is OFF for the correct Binary Output 7 to open the valve (note, polarity
is reversed on this point). If the TRIAC is not closed, then check the Symbio 210 controller
TRIAC output, wiring connections, and relay output.
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.
