TESTO 557, Инструкция по эксплуатации

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6 Using the product
16
3. Saving settings: Press [Set] .
- The measuring mode is displayed.
Display Mode Function
Refrigeration
system Normal function of the digital
manifold
Heat pump Normal function of the digital
manifold
Automatic mode When automatic mode is
activated the digital manifold
testo 557 automatically
reverse the display of high
and low pressure. This
automatic reversal occurs
when the pressure in the low
pressure side is 1 bar higher
than the pressure in the high
pressure side. This switching
over is indicated by
----
flashing in the display. This
mode is particularly suitable
for air conditioning systems
that provide cooling and
heating.
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6.2. Performing the measurement
WARNING
Risk of injury caused by pressurized, hot, cold or toxic
refrigerants!
> Wear protective goggles and safety gloves.
> Before applying pressure to the measuring instrument: Always
fasten the measuring instrument on the suspension attachment
to prevent it from falling down (danger of breakage)
> Before each measurement check the refrigerant hoses for
flawless condition and correct connection. Do not use any tools
to connect the hoses, tighten hoses only hand-tight (max.
torque 5.0 Nm / 3.7 ft*lb).
> Comply with the permissible measuring range (-14.7…870 psi
/ -1…60 bar). Pay particular attention in systems with
refrigerant R744, since these are frequently operated with
higher pressures.