Huber Pilot ONE Unistat T3*0, Operation Manual

Page: 91 / 100

Service/maintenance
Chapter 7 OPERATION MANUAL
V2.4.0en/22.07.20//17.12
Unistat® T300 Series
91
7.4 Thermal fluid inspection, replacement and circuit cleaning
The illustration “connection diagram” can be found on page 99 in section »Annex« .
Extremely hot / cold surfaces, connections and thermal fluids
BURNS/FREEZING OF LIMBS

Surfaces, connections and tempered thermal fluids can be extremely hot or cold depending on
the operating mode.

Avoid direct contact with surfaces, connections and thermal fluids!

Wear your personnel protective equipment (e.g. temperature-resistant safety gloves, safety
goggles).
During an active circulation, the thermal fluid circuit is shut off by shut-off valves
MATERIAL DAMAGE TO THE CIRCULATING PUMPS INSTALLED IN THE TEMPERATURE CONTROL UNIT

Do not close the thermal fluid circuit during an active circulation by means of shut-off valves.

Warm the thermal fluid to room temperature before stopping the circulation.
7.4.1 Thermal fluid inspection
Thermal fluid is not inspected on a regular basis
BURNS DUE TO REDUCED BOILING POINT

Regularly check your thermal fluid whether it meets the specifications in the safety data sheet.
Thermal fluid is not inspected on a regular basis
DAMAGE TO THE HEAT EXCHANGER AND/OR ELECTROMECHANICAL PARTS.

Regularly check your thermal fluid whether it meets the specifications in the safety data sheet.
Oxidation
Oxidation ages the thermal fluid and changes its characteristics (e.g. reduced boiling point). The
reduced boiling point may cause overflow of very hot thermal fluids at the >Expansion vessel< [18]
during temperature control of high temperatures. It may cause serious burns of the limbs.
Hygroscopy
During continuous temperature control below room temperature the thermal fluid accumulates
water by hygroscopicity over time. Such a liquid mixture causes the evaporator to burst during
temperature control in the minus range. This is caused by the water in the liquid mixture, which
forms ice crystals on the evaporator. A temperature control of such a liquid mixture at high tem-
peratures reduces the boiling point. A temperature control at high temperatures may cause an
overflow of very hot thermal fluid at the >Expansion vessel< [18] as a result of the reduced boiling
point. It may cause serious burns of the limbs.
7.4.2 Thermal fluid replacement
Mixing different thermofluids in a thermal fluid circuit
PROPERTY DAMAGE

Do not mix different types of thermofluid (such as mineral oil, silicone oil, synthetic oil, water,
etc.) in a thermofluid circuit.

The thermal fluid circuit must be rinsed when changing from one type of thermal fluid to an-
other. No residues of the previous type of thermal fluid may remain in the thermal fluid circuit.
7.4.2.1 Externally closed application
To replace the thermal fluid, proceed as described from page 66 in section »Externally closed appli-
cation« . The draining and filling operations are described in this section.
7.4.2.2 Externally open application
To replace the thermal fluid, proceed as described on page 71 in Section »Externally open applica-
tion« . The draining and filling operations are described in this section.