9,10 Preliminary Checks ..........................9 Evacuate and Dehydrate ......................9 Refrigerant Charge ...........................9 Compressor Overload ........................9 Cycle-LOC™ Device ..........................9 Low-Pressure/Loss-of-Charge Switch (LPS) ...9 High-Pressure Switch (HPS) .................10 Time Guard. II Device .......................10 Refrigerant Service Ports ...................10 Cooling .....................................10 Sequence of Operation ..

Close both compressor service valves if applicable (on 38AKS008,009,012) when crankcase heater is deenergized for more than 6 hours. 12 TROUBLESHOOTING GUIDE SYMPTOM CAUSE REMEDY Compressor does not run — Contactor open Power off. Restore power. Fuses blown. Replace with correct fuses after finding cause and correcting. Transformer open/shorted. Replace transformer if primary windings are receiving power and no output. Thermostat circuit open. Check thermostat setting. Low-pressure switch open.

• Allow sufficient space for airflow clearance, wiring, refrigerant piping, and unit servicing. See Fig. 2. • Locate unit so that condenser airflow is unrestricted on all sides and above. Refer to Fig. 2. • Unit may be mounted on a level pad directly on base rails or mounted on raised pads at support points. See Table 2 for weight distribution based on recommended support points. NOTE: If vibration isolators are required for a particular installation, use corner weight information in Table 2 to

Recover refrigerant prior to brazing. Pass nitrogen or other inert gas through piping while brazing to prevent formation of copper oxide. Install field-supplied thermostatic expansion valve to evaporator section. It is recommended that a field-supplied liquid line solenoid be positioned in the main liquid line close to the evaporator coil, and wired to close when compressor stops to minimize refrigerant migration during the ‘‘OFF’’ cycle. Table 4A — Liquid Line Data — 60 Hz UNIT 38 MAX ALLOWABLE

18 AWG cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat. 1. Connect thermostat wires to screw terminals of low- voltage connection board. 2. Pass the control wires through the hole provided in the corner post. (See Fig. 7.) 3. Feed wire through the raceway built into the corner post and into the 24 v thermostat connection board. The 24 v thermostat connection is located on the left side of the low-voltage connection compartment. The race

Check reason for safety trip. Compressor restart is accomplished by manual reset of the thermostat by turning the selector switch to OFF position and then to ON position. Sequence of Operation — At start-up, the thermostat calls for cooling. With all safety devices satisfied, the compressor contactor and fan contactor energize, causing the compressor and outdoor (condenser) fan motor to operate. Contacts close, allowing the field-supplied and -installed indoor (evaporator) fan contactor to funct

) except for the following items . AIR-COOLED CONDENSER LOCATION The air-cooled condenser should not be located more than 60 feet above, or 15 feet below the base unit. Cneck the installation booklet with the condenser for installation details. In order to prevent condensed liquid refrigerant or oil from causing damage to the compressor, install a trap in the vertical discharge line near the compressor. The trap may be installed within or adjacent to the base unit chassis. The height of the t