When working on air conditioning, questions frequently arise concerning what the suction and discharge pressures should be. These pressures will vary depending on ambient temperature, the number of people in the coach, etc.
As a general "Rule of Thumb", the suggestions listed below will give you an idea of what the two pressure readings should be for a given day & situation. The values you obtain by this method are not exact; simply a "ballpark" reading.
Take a measurement of the condenser air inlet temperature (ambient temperature.) Add 40°F to this measurement. Using the attached conversion chart, convert this temperature to pressure.
Measure the return air temperature and subtract 30°F from this temperature. Using the attached conversion chart, convert this temperature to pressure.
These numbers will not be exact, but should give you a general idea of what your suction and discharge pressures should be reading.
If you need further assistance, contact the MCI Customer Support Center at (800) 241-2947.
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