WTR2-640
Chapter 4: Operation
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Mode Indicator Lights
Select the unit operating mode by using the selection switch.
Power On Mode Indicator Light.
The Power On mode indicator light illuminates
to indicate that the control circuit is energized in the unit.
Auto Mode Indicator Light.
The Auto mode indicator light indicates that the Auto mode
is active and the controller is monitoring the system and controlling the process.
If the Auto light is off and the Cool Solenoid indicator light is illuminated, the controller
is disabled and the cooling solenoid is open, permitting maximum cooling.
If the Auto and Cool Solenoid indicator lights are off, the unit is in standby.
Fault Indicator Lights
Pump Overload Indicator Light.
The Pump Overload indicator light illuminates when
the pump is overloaded.
This is an alarm condition
, so the audible alarm activates to notify
you of the pump overload fault, and the unit shuts down.
Always correct the alarm condition before returning to normal
operation!
Low Pressure Indicator Light.
The Low Pressure indicator light illuminates when the unit
has low heat transfer fluid pressure.
This is an alarm condition
, so the audible alarm
activates to notify you of the low pressure fault, and disables controller outputs, permitting
the pump to continue to circulate fluid to avoid damage. If low pressure continues past five
minutes elapsed time, the pump shuts off.
Always correct the alarm condition before returning to normal
operation!
Safety Thermo Indicator Light.
The Safety Thermo indicator light illuminates when the unit is overheating.
This is an alarm
condition
, so the audible alarm activates to notify you of the safety thermo fault, and
disables controller outputs, permitting the pump to continue to circulate fluid to avoid
damage.
Always correct this alarm condition before returning to
normal operation!
High Level Indicator Light (Optional).
The High Level indicator light illuminates
when the heat transfer fluid level in the reservoir tank is too high. Carefully remove just
enough fluid so this indicator light shuts off.
Low Level Indicator Light.
The Low Level indicator light illuminates when the heat
transfer fluid level in the system is too low.
This is an alarm condition
, so the audible
alarm activates to notify you of the low fluid level fault, and the controller outputs are
disabled.
Always correct the alarm condition before returning to
normal operation!
