1. A solar air conditioning system comprising: 3. The solar air conditioning system of claim 1, wherein said solar collector comprises: 4. The solar air conditioning system of claim 3, wherein said solar collector further comprises: 11. The solar air conditioning system of claim 8, wherein said solar collector further comprises: 21. The solar air conditioning system of claim 1, further comprising: 24. A solar collector comprising: 27. The solar collector of claim 26, further comprising: 28. The solar collector of claim 27, further comprising: 34. A method of circulating a working fluid in a closed loop within a solar air conditioning system, the method comprising:Here’s some must-know info for HVAC contractors: Quick Reference Data sheets. These technical guides, also called QRDs, are absolutely critical for charging our 13-SEER systems with Micro-Channel coils. These air conditioners are very sensitive to an overcharge, so the QRD is necessary to make sure the charge is done properly.

Contractors can find Quick Reference Data sheets on NORDYNE U > Technical Literature in the “Technical Specifications” category. For help on reading these sheets, check out our video below.Join the Conversation4 comments on “Charging by the QRD” How can we help you today? The purpose of this procedure is to determine and verify that residential split system space cooling systems and heat pumps have the required refrigerant charge and that the metering device is working as designed. The procedures only apply to ducted split system central air conditioners and ducted split system central heat pumps. The procedures do not apply to packaged systems. For dwelling units with multiple split systems or heat pumps, the procedure shall be applied to each system separately. Refrigerant charge refers to the actual amount of refrigerant present in the system. Refrigerants are the working fluids in air conditioning and heat pump systems that absorb heat energy from one area (the evaporator) and transfer it to another (the condenser).

Excessive refrigerant charge (overcharge) reduces system efficiency and can lead to premature compressor failure. how much does a 2 ton trane ac unit costInsufficient refrigerant charge (undercharge) also reduces system efficiency and can cause compressors to overheat. how to charge a ac unit with 410aThe measurement and regulation of correct refrigerant charge can significantly improve the performance of air conditioning equipment and potentially extend the life of the equipment.furnace blower motor symptoms Common causes for a failed RCM test are: For the tech-minded, both subcool and superheat are used for TXV systems. For fixed orifice systems, superheat is used along with Table RA3.2-2 Target Superheat (see page RA3-17).

RCM Minimum Airflow Requirement = 300 CFM/Ton For the Refrigerant Charge Measurement (RCM), the HERS rater must also verify that there is a minimum total airflow of 300 CFM per nominal ton, or more. Airflow less than this is likely to cause substantial energy inefficiencies and is often the cause for a failed RCM test. For instance, a 3-ton system must have 900 CFM (3-tons x 300 CFM/ton) of total system airflow. A 4-ton system requires 1200 CFM (4-tons x 300 CFM/ton), etc. Typical residential systems are designed for 400 CFM/Ton, but most “existing” systems rarely achieve this. Common causes for insufficient airflow and a failed test are: Possibly the most common cause for failing a HERS airflow test is when the existing duct system is used. Existing duct systems are rarely designed for proper system performance. When a system is “up-sized”, like changing from a 4-ton to a new 5-ton, without replacing the existing duct system, the problem is exacerbated. Three Methods Allowed for Measuring RCM Minimum Airflow:

An interesting fact is that one test may pass while another fails. CEC requirements allow any of the three tests for testing at the HERS Rater’s discretion. Temperature Measurement Access Holes (MAH) These two holes provide a non-intrusive means for placement of the temperature sensors that are required by the RCM verification test procedures The MAH feature consists of two appropriately labeled holes– one in the supply plenum upstream from the evaporator coil and one in the return plenum downstream from the coil. The temperatures are used for the “Temperature Split” readings, static pressures, and for flow grid testing. Saturation Temperature Measurement Sensors (STMS) For completely new systems, the STMS provide a non-intrusive means for refrigerant charge verification, since they eliminate the need for a rater/inspector to open the system’s refrigerant service access ports to install refrigerant pressure gauges on the suction and discharge lines. The STMS feature consists of two permanently installed temperature sensors, one mounted on the evaporator coil and one mounted on the condenser coil.

The sensors are required to be factory installed, or field installed according to the manufacturer’s specifications. These STMS must be equipped with industry standard mini plugs that allow the system installers and HERS raters to use the sensors to measure the coil saturation temperature by attaching the temperature sensor mini plugs to a digital thermometer instrument. To adjust or check the refrigerant charge on an air conditioning system using the standard charge measurement procedures, it is necessary to determine the instantaneous “saturation temperature” in the evaporator coil and in the condenser coil. A refrigeration technician typically determines this temperature by measuring the coil pressure and using a saturation temperature chart to look up the saturation temperature at that pressure. Digital manifold gauges perform this calculation automatically without the use of a chart. 2013 Standards require digital manifold testing with monthly calibrations. 1st Choice HES Rating uses state of the art equipment in an effort to obtain accurate data and ultimately passing results.