Huber 705 - Thermal Fluid Replacement; Externally Closed Application; Externally Open Application; Rinsing the Thermal Fluid Circuit

Service/maintenance
OPERATION MANUAL Chapter 7
Unistat® V2.0.0en/09.06.16//15.09
88
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 from page 64 in section »Externally closed application«. 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 68 in section »Externally open applicati-
on«. The draining and filling operations are described in this section.
7.4.3 Rinsing the thermal fluid circuit
Setpoint and overtemperature protection are not adjusted to the thermofluid
MORTAL DANGER FROM FIRE
 The cut-out value of the overtemperature protection must be adapted to the thermofluid. Set
the cut-out value of the overtemperature protection 25 K below the combustion point of the
thermofluid.
 The setpoint set during rinsing must be adjusted to the thermofluid used.
Non-compliance with the safety data sheet for the thermofluid to be used
INJURIES
 Risk of injury to the eyes, skin, respiratory tract.
 The safety data sheet for the thermofluid to be used must be read prior to use and its contents
respected.
 Observe the local regulations/work instructions.
 Wear your personnel protective equipment (e.g. temperature-resistant safety gloves, safety
goggles, safety footwear).
 Danger of slipping because floor and work area are contaminated. Clean the work station and
follow the instructions for the disposal of thermofluid and material on page 16 in section
»Proper disposal of resources and consumables«.