Displaying Superheating/Sub Cooling (Testo 556 Only); Menu; Refrigerant - testo 555 Bedienungsanleitung

5. Operation
P P r r e e l l 0 0 . . 3 3
p p r r o o b b - - 2 2 8 8 . . 4 4
t t o o o o
1 1 2 2 . . 6 6
R R e e f f r r i i g g e e r r a a n n t t
12
5.2.3 Displaying superheating/sub cooling
(
testo 556
If one or two temperature sensors are connected to the unit, the
sensor temperature(s) are displayed instead of the evaporation and
condensation temperatures.
The upper sensor connection is assigned to pressure blue and the
lower connection to pressure red. The pressure at the upper
connection is therefore used to calculate the superheating
(evaporation temperature) and the pressure at the lower
connection to calculate the sub cooling (condensation
temperature).
1 Connecting sensors
1 1 9 9 . . 9 9
2 Press
4 4 4 4 . . 8 8
p p r r o o b b
-
t t c c u u
3 Press
1 1 . . 2 2
cooling
the pressure gauge screen with

5.3 Menu

Press key functions
to open the menu.
Choose the menu items with
The display indicates which of the two keys can be used.
Confirm selection with
Return to the previous menu level with

5.3.1 Refrigerant

The data of 35 refrigerants are stored in the testo 555/556. New
refrigerants can be programmed by the manufacturer.
1 Select
2 Confirm selection with
3 Select desired refrigerant with
4 Confirm selection with
- The unit adopts the data of the selected refrigerant and returns
to the previous measurement screen.
only)
to activate the measurement screen.
appears on the display.
to display the values for overheating
t t c c u u
. Change between the measurement screen and
.
R R e e f f r r i i g g e e r r a a n n t t
with
.
.
t t o o o o
.
or .
.
or .
or .
and sub