Huber Pilot ONE Unistat T300 Series, Operation Manual

Page: 60 / 90

Setup mode
OPERATION MANUAL Chapter 4
Unistat® T300 Series
Liability for errors and misprints excluded. V1.2.0en/12.05.15//14.06
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The temperature in the >Expansion vessel< [18] is measured by a temperature sensor. The expan-
sion of the hot thermal fluid during degassing may increase the temperature in the >Expansion
vessel< [18]. A passive cooling device prevents too high temperatures in the >Expansion vessel<
[18], thereby protecting the thermal fluid fr om oxidation too. The factory setting for this is 45 °C.
However, brief temperatures of > 70 °C may be caused in the >Expansion vessel< [18] by rising gas
bubbles during degassing. This happens due to aging and the nature and amount of the low-boiling
thermal fluid contained in the temperature control circuit.
Under the category “Safety” in the section “Overtemperature” , the cut-out value of the installed
temperature sensor can be set up to 100 °C in the degassing mode. In normal mode, only max. 70 °C
can be set for the >Expansion vessel< [18].
Never use water as a thermal fluid, even in combination with anti-freeze . Thermal fluids are hygro-
scopic (water-attracting) to a greater or lesser degree. This effect increases as the working tempera-
ture decreases. The off-gassing mode below, which must be permanently monitored , also helps you
remove any water residues from the temperature control circuit. The optional sealing set (Order No.
9402) can be used to further reduce the influence of oxidation and deliquescence in the >Expansion
vessel< [18].
PROCEDURE

Activate the menu item “Degassing” after completing the venting operation.
Prerequisite: You have filled the temperature control unit in accordance with the instructions on
page 58 in Section »Filling and venting externally closed application« and/or cleaned it as per
page 82 in Section »Cleaning the thermal fluid circuit« .

Go to the “Categories Menu”.

Tap on the category “Temperature Control”.

Tap on the category “Start/Stop”.

Tap on the dialog entry “Start degassing”.

Confirm your choice by tapping on “OK”.

Read the Note and confirm by tapping on “OK”.

Go to the “Home” screen.

Tap on the keypad symbol next to “T
Setpoint
”.

Enter a setpoint using the number keypad that appears. This setpoint must be below the low-
boiling thermal fluid. The setpoint will be increased in 10 K steps during the degassing process up
to the maximum working temperature.

Confirm your entry by tapping on “OK”.

In the display that follows, confirm your entry again by tapping on “OK”.
The correct selection will be displayed graphically and the “setpoint” will be changed immediate-
ly. If tapping on “OK” is not correct, it will be displayed graphically for 2 seconds. Then the dis-
play will return to the “Home” screen again. Try changing the “setpoint” again.

Carry out temperature control to this setpoint until the temperature in the >Expansion vessel<
[18] no longer rises or even falls.
Monitoring the temperature in the >Expansion vessel< [18].

Go to the “Categories Menu”.

Tap on the category “Safety”.

Tap on the category “Display OT values”. All the measured temperatures will be displayed.

Check the temperature in the >Expansion vessel< [18]. The degassing process is active if it in-
creases. Wait until the temperature in the >Expansion vessel< [18] no longer rises or even falls.

Go to the “Home” screen.

Tap on the keypad symbol next to “T
Setpoint
”.

Increase the setpoint by 10 K.

Confirm your entry by tapping on “OK”.

In the display that follows, confirm your entry again by tapping on “OK”.
The correct selection will be displayed graphically and the “setpoint” will be changed immediate-
ly. If tapping on “OK” is not correct, it will be displayed graphically for 2 seconds. Then the dis-
play will return to the “Home” screen again. Try changing the “setpoint” again.

Carry out temperature control until the temperature in the >Expansion vessel< [18] no longer
rises or even falls.