Maintaining The Product - testo 523 Bedienungsanleitung

10 Using the product
Button functions
· : Change measurement value display. Possible display combinations:
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Evaporation pressure
Refrigerant evaporation temperature. t
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- or (only with connected temperature probe) -
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Evaporation pressure
Measured line temperature. t
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- or (only with connected temperature probe) -
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Evaporation pressure
Super-heating ∆t
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· Function button
on, last reset or last switch-over t
· Function button
· Function button
pressure side (blue) or high pressure side (red). Only available when a temperature probe is connected
and the measured temperature or sub-cooling/super-heating is displayed.
- When the critical pressure of the refrigerant is reached: Measurement
value and display illumination flash.

Maintaining the product

Cleaning t t he h h ousing:
If dirty, clean the housing with a damp cloth (soap solution). Do not use
aggressive cleaning products or solvents!
Keep c c onnections c c lean:
Keep screw connections clean and free of grease and other deposits, if
necessary clean with a damp cloth.
Removing o o il t t races:
Carefully blow any oil traces out of the valve block with compressed air.
oh
/ t
oh sh
Hold/Min/Max
: Freeze measurement values, display min./max. values (since switch-
<--> t
oh
RESET
: Reset min./max. values. Only available when min./max. values are displayed.
t <--> t
: Allocation of the temperature probe measurement value to the low
oh cu
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Condensation temperature
Refrigerant condensation temperature. t
o
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Condensation pressure
Measured line temperature. t
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Condensation pressure
Sub-cooling ∆t
cu
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).
cu
cu
/ t
sc
c