User manual

Appendices Phason
54
Variable fan not running Incorrect wiring  Correct the wiring. For more information,
read
Connecting variable-stage cooling
elements
on page 16.
The fuse is open or blown.  Check why the fuse was blown and repair
any problems. Replace the fuse.
The variable stage is configured as
OFF
 Configure the variable stage for cooling.
For more information, read
Configuring
the stages
on page 26.
The idle speed setting is too low.  Increase the idle speed setting. For more
information, read
Programming variable
stages
on page 33.
The idle range temperature setting is
too high.
 Decrease the idle range temperature
setting. For more information, read
Programming variable stages on page
33.
The temperature set point is above
room temperature.
 Adjust the set point to the desired
temperature. For more information, read
Programming variable stages on page
33.
There is no power to the fan.  Switch on the power.
Faulty fan/heater  Replace the equipment.
Circuit breaker open  Reset the breaker.
Variable speed fan responds to
only a small portion of the 0 to
100% range
Incorrect motor curve
 Configure the stage to use the other motor
curve. For more information, read
Configuring the stages on page 26.
Variable speed fan comes on,
runs at full speed, and then turns
off, keeps cycling.
The hysteresis is not high enough.
The outside temperature is rising
and falling quickly. This happens
most often in the spring and fall.
 Adjust the hysteresis setting.
Relay does not switch ON the
load
Incorrect wiring
 Correct the wiring. For more information,
read the appropriate installation section.
The stage is configured as OFF, as
cool for a heater, or as heat for a
fan.
 Configure the relay properly. For more
information, read
Configuring the relay
stage,
on page 27.
The set point is incorrect  Adjust the setting. For more information,
read the appropriate programming
section.
No power to the load  Switch on the power.
Faulty equipment  Replace the equipment.
Circuit breaker open  Reset the breaker.
Blown relay  Solve the problem that caused the relay to
blow and then replace the circuit board or
use a different relay.
Relay does not switch OFF the
load
The stage is configured as ON.  Configure the relay properly. For more
information, read Configuring the relay
stage,
on page 27.
Alarm relay not operating alarm
system
Incorrect wiring  Correct the wiring. For more information,
read
Connecting an alarm system on
page 18.