Tuttnauer 2540 Series Safety Thermostat Replacement
(Installation and replacement procedures are identical for both the Safety
Thermostat and the Cut-Out Thermostat)
NOTE: DO NOT ATEMPT TO ADUST THIS THERMOSTAT
This Thermostat is calibrated at the factory and does not require calibration
Tampering with the adjustment on this thermostat will totally defeat
the safety feature.
The only recommendation is that a defective thermostat be replaced with a factory
Removing The Old Safety Thermostat
Installing The New Safety Thermostat
- Unplug the unit
- Remove the wires from the terminals
Tech Tip: Tag Each Wire As It Is Removed To Simplify Reconnecting To The New Safety Thermostat
- Remove the two screws holding the Safety Thermostat to the mounting bracket, or
unscrew the lock nut, which ever method is being used to secure the thermostat
- Loosen the bolts on the rear most Heating Element or which ever element
the probe is held in place by. Remove the probe
- Carefully uncoil the tubing connecting the probe to the contact body
The probes and the tubing leading to the body of the thermostat are
filled with liquid. It is important that while working with these
sensors that the tubing not be kinked.
If the tubing is kinked or the probe punctured the device will not work and should be replaced.
- Mount the new thermostat body using the screws or lock nut that were removed in step 3 above.
- Carefully route the probe and tubing over to the rear Heating Element
- The new probe should be installed in the proper channel on the rear most Heating Element, regardless
of what element the probe was under originally
The Safety Thermostat is in the lower channel
The Cut-Out Thermostat is in the upper channel
The body of the Cut-Out Thermostat is mounted on the top portion of the mounting bracket.
The body of the Safety Thermostat is mounted on the bottom portion of the mounting bracket.
NOTE: Improper mounting of the probes will result in a malfunctioning of the autoclave.
If the replacement thermostat has a long probe it is only necessary to
secure the rear portion of the probe under the rear most element.
- Retighten the Heating Element making sure that the probe is held securely between the element
and the Chamber.
It is important that the probes be snug in channels of the Heating Elements.
If they are loose they will not make good contact with the Chamber and well not properly sense
Flattening the channel on the Heating Element slightly is an acceptable way of
snugging the probe.
- Reconnect the wires to the same terminals that they were removed them
Be careful not to connect a high voltage wire to the ground terminal.
If the replacement thermostat does not have a separate ground terminal then
the ground wire need not be connected. Screwing the thermostat to the
mounting bracket will supply sufficient grounding.