CPS FX1234, Service Manual, Page: 23 / 57

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7. Gauge Calibration
It will be necessary to recalibrate the LO & HI Side Manifold gauges periodically. Read the LO and HI Side Manifold gauges.
If pressure is present, proceed to run RECOVER mode. Once RECOVER mode is complete, open the LO Side and HI Side
Service hoses to atmosphere by removing the service couplers from the end of the service hoses. Always use caution when
opening hoses. Always expect refrigerant to be present. When open to atmosphere, the reading on the gauge should be
0 psig/MPa/kPa/bar. If the gauges read correctly, close the Service hoses. Calibration is not required. If the gauges are not
reading correctly, re-calibration is required. First make use the service couplers or ball valve on the end of the service hoses are
removed or open to atmosphere. Then remove the Plastic Plug on the gauge lens. And finally use a small flat tip screwdriver to
turn the pressure gauge adjustment screw (located on the face of the gauge) until the gauge pointer reads 0 psig/Mpa/kPa/bar.
Repeat this adjustment for both gauges. Once done re-install the Plastic Plugs and the service couplers
8. Pressure Transducer Calibration
a. Perform a PT calibration from PT diagnostic test screen.
b. Turn unit on and press service on start up screen.
c. Then press PT diagnostic on screen and allow calibration of pt to run.
d. Once the test screen appears then tap the CPS icon 4 times and the PT icon will appear.
e. Press PT icon and follow instruction on screen for recalibrating pressure transducers. 70 to 100 PSI will be needed.
Remove plastic plug