VAV-SVP01A-EN
101
Troubleshooting
•
Check group, global, and/or Tracer overrides to make sure they are not inhibiting fan
operation.
4. A flow override exists locking out the fan output
•
Check to make sure Tracer or Rover has released fan disable override.
Note:
If fan cycling is based on temperature go to step 5 and if it is based on air flow go to step
6.
5. If fan control is based on temperature and Zone temperature is at or above the heating set point
plus heating offset on units configured as temperature control. A factory set differential of 0.5°F
exists to prevent short cycling.
•
Increase the VV550 heating set point causing fan to be cycled on.
•
Lower the Heating setpoint by.6 degrees and the fan should cycle off.
6. If the fan control is based on flow, the unit fan will be energized whenever primary airflow is
below this set point. For this parallel fan configuration, the fan control point, if specified in a
percentage of unit airflow, must be set between 15% and 30% of the units cataloged airflow to
assure proper operation. A differential of 5% exists to avoid excessive fan cycling.
•
Override damper closed until CFM is below enabled flow setpoint
•
See if fan cycles on
•
Override damper open until CFM is above enabled flow setpoint fan should cycle off
7.
If VAV VV550 Controller is calling in the status menu for the Fan to be on and it is not then check
the VAV VV550 Controller Triac output, wiring, and Relay output.
•
Check J8 to common TB1-2. Should have 24VAC; if it does not, measure the power input to
on TB1-1 24VAC input and TB1-2 of the VV550 board. The supply voltage should be between
20 and 28 VAC (24VAC cataloged). However, voltages at either extreme may result in system
instability.
•
Triac can be checked with purchasing a 24VAC light bulb and see if it lights up on call for fan
VAV VV550 Controller if light bulb does not light up replace VV550
•
Remove fan wires from VV550 and apply 24VAC directly to fan relay wires.
•
Fan relay should energize. If it does not energize check wiring. If wiring is OK replace fan
relay.
Notice:
Equipment Damage!
VAV VV550 Controller outputs are switched to ground. Do not jumper 24VAC to Binary output
Triacs because damage will occur.
8. After all checks have been completed, check motor fan winding integrity and bearing failure.
PSC Variable Speed Motor Check Out
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.
If PSC Variable speed motor control is not changing speed of the motor inspect the following:
•
Wires connected improperly
Содержание VAV VV550 LonTalk
Страница 1: ...May 2010 VAV SVP01A EN Installation Operation Programming VAV VV550 LonTalk Controller...
Страница 17: ...VAV SVP01A EN 17 VAV Start Up Check Out Procedure Figure 2 VV550 single duct control diagram...
Страница 18: ...18 VAV SVP01A EN VAV Start Up Check Out Procedure Figure 3 VV550 fan powered control diagram...
Страница 107: ...VAV SVP01A EN 107 Troubleshooting Figure 59 VV550 single duct control diagram...
Страница 108: ...108 VAV SVP01A EN Troubleshooting Figure 60 VV550 fan powered control diagram...
Страница 110: ...110 VAV SVP01A EN Troubleshooting Figure 62 Single duct with three phase voltage electric heat...
Страница 112: ...112 VAV SVP01A EN Troubleshooting Figure 64 SCR PSC fan powered with three phase voltage electric heat...
Страница 114: ...114 VAV SVP01A EN Troubleshooting Figure 66 ECM fan powered with three phase voltage electric heat...
Страница 115: ......