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Checking or Replacing the
Temperature Sensor
The EarthSmart ECM Series Chiller uses a RTD sensor to monitor the temperature
of the process coolant.
To check or replace an RTD sensor:
1 Disconnect and/or lockout the main power supply.
2 Locate the RTD sensor.
3 Check the sensor’s position and condition. Temperature readings will be
incorrect if the sensor is touching the wall of a pipe or if the sensor or wiring is
damaged. Sensor wires should be attached to the appropriate connection points
on the chiller’s control center.
4 To check with ohm meter, measure the resistance across the RTDs. The
resistance should be approximately 110 ohm at room temperature. See
Appendix F entitled, RTD Resistance Chart.
5 Remove the sensor from its housing using an appropriately-sized wrench.
6 Inspect the sensor for cleanliness. Replace if necessary with another sensor of
the same rating.
7 Replace the RTD, by wrapping the its threads with Teflon tape or pipe dope.
8 Re-insert the RTD into its housing, start by hand until its threads engage.
Tighten with an appropriately-sized wrench, do not over tighten.
Typical location of
the RTD at the
chiller’s evaporator.
IMPORTANT
: Always refer
to the wiring diagrams
that came with your
chiller to locate specific
electrical components.
Illustrations in the User
Guide are intended to be
representative only.
Replacement RTDs are
available from Conair.
Contact Conair Parts
(800) 458 1960
From outside of the
United States, call:
(814) 437 6861
6-8 l Troubleshooting