MAHLE RTI TX200-UNDP - Manual (Page 13)

Page 12
SPR ADJUSTMENT
The TX200 has been factory adjusted and tested for optimum performance at operating temperatures from 10
to 49
0 C. Adjustment of the SPR Valve was optimized to prevent High Pressure Shut Down during operation
at higher temperatures.
Increased recovery rates can be obtained at normal operating temperatures (Approx 21 0 C) by re-adjusting the
SPR Valve. The following describes how to re-adjust the SPR:
1. Remove the TX200 Cover.
2. Remove the Cap from the Vent Port on the Compressor.
3. Connect a Low Pressure Manifold Gauge to this port. The hose used to make this connection must have
a Valve Core Depressor.
4. Locate the SPR Valve which is silver in color and mounted just inside the Inlet Port of the TX200.
5. Use a screw driver to remove the Plastic Cap from the end of the SPR Valve to gain access to the SPR
adjusting screw.
6. Connect the Inlet of the TX200 to a cylinder of R12 or R22 Refrigerant and operate the TX200 as
described in the Recovery Mode of Operation section of this manual.
7. Use a screw driver to turn the SPR adjusting screw clockwise one full turn.
8. Turn the TX200 off and observe the pressure increase on the Gauge Manifold connected to the
Compressor.
9. Turn the TX200 on and observe the pressure drop. This pressure will decrease and stabilize at the new
"SPR Pressure Setting".
10. Repeat the above steps until the "SPR Pressure Setting" is 1.7 Bar.
11. Replace SPR Valve Plastic Cap, Compressor Vent Port Cap, and TX200 Cover.
NOTE... When using the TX200 at higher temperatures, a High Pressure Shutdown causes the Compressor
On Light to go off, even though there is still pressure at the inlet of the TX200. The Condenser Fan
will still be running.
Another way to prevent the TX200 from shutting down is to "throttle" the inlet pressure by slightly
closing the Ball Valve on the Inlet Hose.