Operation and Maint.Manual VUD VUF VDF HCD SeriesRev6.doc
[17]
TROUBLESHOOTING
Problem Action Required
●Supply fan not running ●Verify that the disconnect is in the on position
●Verify that thermostat / controller is not in
unoccupied mode (night set-back)
●Check the fan relay to see if it energizing and de-
energizing properly
●Check to see if the 24V transformer is defective
●Ensure that wire connections are secured
properly
●Check to see if motor is burned out
●Compressor shot cycles ●Ensure that there are no obstructions which
would cause the unit to cut-out on high head
pressure
●Check refrigerant level. If the level is to low, the
unit will cut-out on low pressure. The Refrigerant
type and the amount is posted on the metallized
CSA label located on the fan housing.
NOTE: Temspec does not recommend the use of a Unit Ventilator during
construction/drywall installation as a space heater or air conditioner.
Motor exposure to drywall dust can reduce motor life and leads to
premature failure
To Next Page
