2.1.4 To provide ventilation without cooling,turn the knob of the selector switch to the FAN position. This operates
the evaporator fan motor only. See Figure 5.
2.1.5 To condition the air, turn the selector switch and thermostat until they are located at the COOL/COOLER
position. The compressor will start and conditioned air will be discharged from the unit after a 270 second time
delay has occurred.
If the conditioned space becomes cooler than desired, turn the temperature switch counterclockwise toward the
2.1.7 If the air in the conditioned area becomes too warm or more humidity is present than is desired, turn the
temperature switch to the COOLER position.
2.1.8 If the compressor should fail to operate properly, take off front panel and check the wiring to make certain that
there are no loose connections. For checking further, install test gauges on the compressor and check both the
discharge and suction pressures, If the discharge pressure is higher than 260 lbs. psig, make certain the water
flow rate through the condenser is adequate and that the water regulating valve is operating properly. If the
suction pressure is lower than normal, make certain the passage of air through the filters is unrestricted.
2.1.9 For complete answers to abnormal unit operation, consult the Trouble Analysis Chart in this manual.
Controls The Model NAC-600 marine air conditioner is controlled electrically and mechanically through the
following component items as described below and as pictorially illustrated on the corresponding drawing
numbers found elsewhere in this manual.