TM 9-2320-289-34
10-20. AIR CONDITIONING SYSTEM TESTING (M1010) (Con’t).
6 .
on air conditioner control panel, turn “VENT-A/C” toggle switch to “ VENT, ” air selection lever
to “ OUTSIDE, “ “ A/C COLD” knob to coldest setting, and fan switch to “H1.” Open ambulance
rear 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 5
minutes, then check temperature.
8 .
Check low side gage (4) and high side gage (5) and determine performance of air conditioning
system using Table 10-1. High outlet temperature or low pressure at either gage indicate that
system is low on refrigerant.
Table 10-1. Air Conditioning System Performance
Air Inlet (Outside)
Temperature
70°F (21°C)
80°F (26°C)
90°F (32°C)
100°F (37°C)
Low Side Pressure
8-13 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 necessary
9.
Remove plug (12) from top of
condenser cover (11) and check for
bubbles in sight glass. Bubbles
indicate that system is low on
refrigerant,
High Side Pressure
1 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)
NOTE
Air Outlet (Inside)
Temperature
33-35°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.
TA50444
10-76
