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 acceptable heat sink material on the valve before brazing. The service valves must be back seated (turned
counterclockwise until seated) before the service port caps can be removed and the hoses of the gage manifold
connected. In this position, refrigerant has access from the through outdoor and indoor unit. The service valve
cannot be field repaired; only a complete valve or valve stem seal and service port caps are available for
replacement.
Maintenance
Lubrication Compressor — Compressor contains factory oil charges; replace oil when lost. Refer to Carrier Standard
Service Techniques Manual, for oil recharging procedure.
Cleaning Coils — Coil should be washed out with water or blown out with compressed air. Note that the blow-thru
design causes dirt and debris to build up on the inside of the coils. Clean coil annually or as required by location and
outdoor air conditions. Inspect coil monthly and clean as required. Fins are NOT continuous through coil sections.
Dirt and debris may pass through the first section, become trapped between the rows of fins, and restrict condenser
airflow. Use a flashlight to determine if dirt or debris has collected between coil sections.
Clean coil as follows:
Turn off unit power. Use a garden hose or other suitable equipment to flush coil from the outside to remove dirt. Be
sure to flush all dirt and debris from drain holes in the base of unit. Fan motors are waterproof.
Leak Detection — New installations should be checked for leaks prior to complete charging. If a system has lost all
or most of its charge, system must be pressurized again to approximately 150 lb minimum. This can be done by
adding refrigerant using normal charging procedures or by pressurizing system with nitrogen (less expensive than
refrigerant). Nitrogen also leaks faster than R-410A. Nitrogen cannot, however, be detected by an electronic leak
detector.
If the compressor does not trip at the cut-out pressure (630 psig), remove the blockage immediately and
contact your local Carrier service center.
Caution
The compressor in this system uses a polyol ester (POE) oil Mobil EAL ARTIC 22CC. This oil is extremely
hygroscopic, meaning it absorbs water readily. POE oils can absorb 15 times as much water as other oils
designed for HCFC and CFC refrigerants. Take all necessary precautions to avoid exposure of the oil to the
atmosphere.
Caution
Before performing service or maintenance, be sure the indoor unit main power switch is off and indoor blower
has completely stopped. Failure to do so may result in electrical shock or injury from rotating fan blades.
Warning
Do not use harsh chemicals for cleaning coils, use only water, compressed air or Carrier approved coil
cleaners.
Warning
Due to the high pressure of nitrogen, it should never be used without a pressure regulator on the tank. Failure
to follow this warning can cause a fire, personal injury, or death.
Warning
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Summary of Contents for 38C Series
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