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James A/C Co.
serving Do-It-Yourselfers since 1990.
Satisfying every customer....one at a time!
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Call toll free 1-866-584-0355 or 1-903-759-2160 fax 903-759-4605
309 Patriot Circle, Longview, TX 75604-2240
THINGS TO CHECK IF THE HEAD PRESSURE IS TOO HIGH:
| If it is determined that a system head pressure is over 400 pounds, immediately turn off the system until a cure of this problem is implemented. |
In the heating season we are in the heat pump mode so the outside unit will now be where the cooling takes place and the indoor coil will be where the high pressure condensing takes place. It is a reverse of the summer conditions and be very careful where you attach your refrigerant gauges.
Attach the high side gauge (red) first on the large line, which is the hot gas directly from the compressor and going to the indoor coil. This line may be very hot, so be careful. You may instead attach it to the small line which will be liquid refrigerant on its way back to the outside unit.
Attach the low side hose (blue) to the special port for the heat pump mode. It will sense the pressure JUST BEFORE it goes back into the compressor. It will pick up the pressure from between the four-way valve and the compressor. It is low pressure.
- Dirty filters is the number one cause of this problem. Remember, the indoor coil is now high pressure -- a condenser. If the filter is dirty, the pressure will become very high.
- Dirty evaporator coils will be the same as any restriction of air over this indoor condenser. Check the airflow for restrictions. Look for blocked return air grills as well and make sure the fan is running properly.
- Refrigerant overcharge is a very common occurrence and results in high head pressure as well as high suction pressure. Check the subcooling to verify this condition. If you need to remove refrigerant, you should contact a dealer with appropriate reclaiming equipment to extract it for you. Sometime if the coils were to be iced, an inexperienced person or a careless technician may add gas to the system to raise the suction pressure, but it results in an overcharge. When the coils thaw, excessive head pressure and higher suction pressure will be present.
- Refrigerant flow restrictions can occur and may be the result of pinched or kinked refrigerant lines. Filter, filter/driers, or Catch-Alls© can also become restrictive if the system contains a large amount of contaminants, non-condensables or foreign matter.
- Non-condensable in the refrigerant can be a major problem. If you suspect water in the refrigerant system, stop here and call a qualified technician. He may be able to save your unit from an early death. The refrigerant from the system will need to be removed and a very good vacuum will have to be performed. Regassing of the system and installation of suction and liquid line filter/driers will have to be done. The system will have to run normally for a week or more and then the driers will have to be again removed or replaced to assure the system in perfectly clean. The oil in the compressor may even have to be removed and replaced. This is no time to experiment.
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