Question about Goodman Heating & Cooling
Not to be critical, but not much of a technician if he cannot properly troubleshoot the issue.
Several issues can cause the freezing problems:
1. Refrigerant charge issue.
2. Improper equipment sizing.
3. Air flow issues.
4. Metering device issue.
First is under charge. But before making this determination several other things must be diagnosed and resolved.
Was the unit sized properly using a heat load calculation? You may not know what this means but a reputable, knowledgable contractor does. If the unit was oversized, it can cause the unit to freeze. If the indoor fan & motor were undersized. it may not be moving enough air across the coil and this will cause the coil & suction line to freeze.
Air flow issues, such as obstructions in your ducting or across your evaporator coil will cause the coil to freeze, thusly your suction line will freeze as well. Is the filter and evaporator coil clean? Are there any obstructions in the air passages (duct)? Is the duct work sized properly. Improper sizing of the duct work may choke down the required return air flow, and cause the coil to freeze.
The last issue could be a problem with the metering device. If it is an adjustable thermostatic metering device, was it setup to maintain a 12 degree suction superheat? If it is a fixed metering device, such as a cap tube device or bullet (orifice) device, it mat have a restriction (ususally a piece of solder or flakes from the soldering process clogging up the inlet screen). To easily check this, thaw the system out, start it back up when thawed and look for frosting or ice accumulation at the metering device outlet side. I fit does this rather quickly, then the system must have the refrigerant recovered (or pumped down into the condenser) and the blockage removed.
If it is air related, this must be fixed prior to properly trying to charge a system. Unless the proper airflow has been established, charging the system, or checking charge cannot be properly performed.
Posted on Sep 04, 2010
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Posted on Jan 02, 2017
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