TM 9-2320-289-3410-20. AIR CONDITIONING SYSTEM TESTING (M1010) (Con’t).6 .on air conditioner control panel, turn “VENT-A/C” toggle switch to “ VENT, ” air selection leverto “ OUTSIDE, “ “ A/C COLD” knob to coldest setting, and fan switch to “H1.” Open ambulancerear doors briefly to exhaust any built up heat. Operate for a minimum of 5 minutes.7 .Close ambulance rear doors tightly. Place thermometer at air conditioner center vent for 5minutes, then check temperature.8 .Check low side gage (4) and high side gage (5) and determine performance of air conditioningsystem using Table 10-1. High outlet temperature or low pressure at either gage indicate thatsystem is low on refrigerant.Table 10-1. Air Conditioning System PerformanceAir Inlet (Outside)Temperature70°F (21°C)80°F (26°C)90°F (32°C)100°F (37°C)Low Side Pressure8-13 psi(55-89 kPa)13-18 psi(89-1 24 kPa)17–22 psi(1 18-151 kPa)23–28 psi(1 58-193 kPa)It may be necessary9.Remove plug (12) from top ofcondenser cover (11) and check forbubbles in sight glass. Bubblesindicate that system is low onrefrigerant,High Side Pressure1 30–150 psi(890-1 034 kPa)165-185 psi(1 137-1276 kPa)190-210 psi(1310-1447 kPa)225-245 psi(1551-1749 kPa)NOTEAir Outlet (Inside)Temperature33-35°F (1-2°C)38-42°F (3-5°C)45-49°F (7-9°C)52-56°F (11-13°C)to scrape paint off sight glass.TA5044410-76
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