The electrical controls for the NAC-600 air conditioner consists of two (2) switches:
1. A three (3) position rotary selector switch, Drawing 001R101, for positions of OFF-FAN-COOL.
2. A temperature control thermostat, Drawing 076R100, which decreases or increased the air
conditioners cooling temperature (refer to Figure 5)
3. A time delay relay control provides a 270 second time d
elay for compressor restart after any type of
shut-down or interruption of power. (See Drawing #337-001) 2.2.2 Electro-Mechanical Controls
consist of pressure controls which are located as follows: A) High Pressure Control located in the
upper recessed panel controls compartment and includes a manual reset capability. (See Drawing
057R101 for details).
Low Pressure Control mounted as an integral part of the refrigeration compressor assembly and has a
fixed cut-out pressure. (See Drawing 144-002 for low temperature control details)
The functions of the pressure controls are to maintain a safe operating pressure for the entire system.
The cut-in and cut out pressure settings for both the high and low pressure elements are tabulated at the
factory and are found stamped on the elements located in the control panel and also in Table 1.