Product Manual
User Manual US-EN SR 10-480 AC
02250246-045 R02
30
Subject to EAR. ECCN EAR99 and related export control restrictions.
11.10 Refrigerant pressure switches LPS – HPS – PV
To ensure the operational reliability and the protection of the dryer, a series of pressure switches are installed in the
gas cycle.
LPS :
Low-pressure guard on the suction side of the compressor, which is triggered when the pressure drops below
the predetermined value. The values are reset automatically as soon as the nominal conditions are re-
established.
Calibrated pressure :
R 407 C
Stop 24.7 psig (1.7 barg) - Restart 39.2 psig (2.7 barg)
HPS :
The high-pressure control unit on the discharge side of the compressor is activated when the pressure exceeds
the predetermined value. It has a manual reset button on the control itself.
Calibrated pressure :
R 407 C
Stop 435 psig (30 barg) - Manual reset P<334 psi (P<23 bar)
PV :
Fan control pressure switch which is installed on the discharge side of the compressor. It keeps the
condensation temperature and pressure constantly in the range of the preadjusted limit values
Calibrated pressure :
R 134.a
Start 160 psig (+7.25 / -0 psi) [11 barg (+0.5 / -0 bar)]
Stop 116 psig (+0 / -7.25 psi) [8 barg (+0 / -0.5 bar)]
R 407 C
Start 261 psig (+7.25 / -0 psi) [18 barg (+0.5 / -0 bar)]
Stop 203 psig (+0 / -7.25 psi) [14 barg (+0 / -0.5 bar)]
11.11 Safety temperature switch TS
To ensure the operational safety and the soundness of the dryer, a safety
temperature switch (TS) is installed at the refrigeration cycle. In the event that the
pressure gas temperature is too high, the sensor of the temperature switch will
stop the refrigerating compressor to prevent the pressure gas temperature getting
too high.
The temperature switch is reset manually, but only when the normal operating
conditions are reached again. Unscrew the cover (see pos. 1 in the illustration) and
press the reset button (see position 2 in the illustration).
TS setting : temperature 235,4°F (+0/-10°F) [113°C (+0 / -6 °K)]
1
2
PQS0005