Product data

SERVICE – 38CG, CS, SB, & SC
WARNING:
Before performing recommended maintenance, be sure unit main power switch is turned off. Failure to do so
may result in electrical shock or injury from rotating fan blade.
OUTDOOR FAN
A reinforced mount holds the outdoor fan assembly in position.
HIGH-PRESSURE/LOW PRESSURE
High and low pressure are monitored by the microprocessor. There are no serviceable relief valves. If the unit goes off on
pressure see trouble shooting Section #27
INTERNAL CURRENT AND TEMPERATURE SENSITIVE OVERLOAD
Control resets automatically when internal compressor motor temperature drops to a safe level (overloads may require up to
45 minutes to reset). When an internal overload is suspected of being open, check by using an ohmmeter or continuity tester.
PUMPDOWN PROCEDURE
The system may be pumped down in order to make repairs on low side without losing complete refrigerant charge.
1. Attach pressure gage to suction service valve gage port.
2. Front seat the liquid line valve.
CAUTION:
The outdoor unit holds only the factory designated amount of refrigerant. Additional refrigerant may cause
units to relieve pressure through compressor internal pressure relief valve (indicated by a sudden rise of suction pressure)
before suction pressure reaches 5 psig. If this occurs, shut off unit immediately, front seat the vapor valve, and remove and
recover excess refrigerant following accepted practices.
3. Back seat valve, start unit, and run until suction pressure reaches 5 psig.
4. Shut unit off and front seat suction valve.
5. De-pressurize low side of unit and recover refrigerant following accepted practices.
FILTER DRIER (If Installed)
Whenever the accessory, field-installed moisture liquid indicator (if installed) shows presence of moisture, replace the filter
drier. If no indicator is installed, replace the filter drier whenever system has been opened for service or maintenance.
WARNING:
DO NOT attempt to simulate system abnormalities. High pressures pose a serious safety hazard.
SERVICE VALVES
The service valves in the outdoor unit come from the factory front seated. This means the refrigerant charge is isolated from
the line-set connection ports. To prevent damage to the valve, use a wet cloth or other accepted heat sink material on the
valve before brazing. The service valves must be back seated (turned counter-clockwise until seated) before the service port
caps can be removed and the hoses of gage manifold connected. In this position, refrigerant has access from and through
outdoor and indoor unit. The service valve cannot be field repaired; therefore, only a complete valve or valve stem seal and
service port caps are available for replacement.