Brookfield Bath, Model TC-101 Digital KU-1 Viscometer - Manual (Page 11)

4.4 No Cooling or Insufficient Cooling
• Check the Cooling switch is ON, the cooling light should also be on. • Check for low or high line
voltage. • Check for blocked airflow through ventilation screens. • Refrigeration unit should
NOT be
operated above 32°C ambient temperature, such a condition may cause the refrigeration compressor
to temporarily shut down. • Check if heat is being added to the fluid in excess of the refrigeration
system’s capacity.
4.5 No Heating
• Check if the unit is pumping properly. • If the heat light is not on, check the setting of the setpoint
temperature and bath temperature. • Be sure HI limit setting is higher than the setpoint. • Check fluid
level of the bath to be sure the heater is covered.
4.6 Insufficient Heating
• Check if the unit is pumping properly. • Check for proper line voltage. • Check for excessive
external cooling load on unit At higher temperatures, problem could be due to heat loss from tanks,
hoses or vapor from the tank. Variance of heat load on the system from experiments may exceed the
power handling of the unit. Changes in heat load or setpoint will require some time to settle to a stable
temperature.
4.7 Triac Failure
• Display shows "E-tF". Heater triac has failed or line supply voltage has a source of extreme
interference from other equipment. • Try the unit on another power source. • If it still displays triac
failure, a triac or triac driver needs replacement.
4.8 Controller Default Settings
Should the need arise, use the following steps to return all settings to the factory default values.
1. Turn the Power switch ON, then unplug the power cord.
2. With the Power switch still ON, press and hold the SET/ENTER button while plugging the power
cord in.
3. The controller will display "DEF" and go to the standby mode.
4. Control point and high limit settings will have to be reset. Any special tuning settings will also have
to be reset. OTP is not affected by default resetting, but should be checked again.
Section 5. Service and Technical Support
If you have followed the troubleshooting steps and your circulator fails to operate properly, contact the
distributor or manufacturer from whom the unit was purchased. Have the following information available
for the customer service person:
— Model and Serial Number
— Voltage (from back panel label)
— Date of purchase and your purchase order number
— Suppliers' order number or invoice number
— A summary of your problem
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