Installation and Maintenance Manual

VAV-SVX07A-EN 85
Troubleshooting
Actuator Failure
• If the actuator has stopped moving to the closed position when commanded to, and there is no
play in the lever, the actuator has failed.
• Remove the actuator and work the cartridge stem manually. If the stem moves freely, then only
the actuator has failed. If the stem is sluggish or stuck, the actuator and the cartridge have failed.
Note: The actuator fault is intermittent and the actuator may operate again when removed from
the valve, or if tapped with a tool while still on the valve.
Note: Actuator indicator on the side of the actuator should be positioned at the top of the actuator
when valve is closed.
VAV Two Position Hot Water Failure Troubleshooting Procedure
Check binary outputs
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.
In the event that the heat outputs are not energizing, properly inspect the following:
1. Zone temperature is at or above the heating setpoint.
• Increase the Tracer™ UC400 controller heating setpoint.
2. Verify the output configuration in the Tracer UC400 controller setup screen.
• Unit needs to be configured as two position hot water.
3. Tracer SC has the heat output disabled.
• Check overrides to make sure they are not inhibiting heat operation.
4. Heat relays have failed.
• If the Tracer UC400 controller is calling in the status screen for the valve to be open and it
is not then check the Tracer UC400 controller TRIAC output, wiring, and relay output.
• If the Tracer UC400 controller is calling in the status screen and LED is on for binary output
to open the valve and triac is not closed then check the Tracer UC400 controller TRIAC output;
wiring; and relay output.
• Check binary outputs. See Figure 37, p. 86 and Figure 38, p. 87 for correct outputs. Should
have 24 VAC; if it does not measure the power input to XFMR 24 VAC input and of the
Tracer UC400 controller. The supply voltage should be between 20 and 28 VAC (24 VAC
cataloged). However, voltages at either extreme may result in system instability.
Notice:
Equipment Damage!
The Tracer UC400 controller outputs are switched to ground. Do not jumper 24 VAC to binary
output TRIAC(s) because damage will occur.
• Heat TRIAC(s) can be checked with purchasing a 24 VAC LED and see if it lights up on call
for heat output to be open by the Tracer UC400 controller. If LED does not light up replace
the Tracer UC400 controller.