We provide useful tips and information for homeowners, facility managers and contractors looking to improve their current HVAC system. Since the minimum efficiency regulation changed to 13 SEER in January 2006, most OEM systems now incorporate a thermostatic expansion valve (TXV) style metering device as the standard for air conditioning systems. It is now extremely important for the HVAC technician to understand the design and operation of this type of valve. The thermostatic expansion valve (TXV) is a precision device, which is designed to regulate the rate at which liquid refrigerant flows into the evaporator. This controlled flow is necessary to maximize the efficiency of the evaporator while preventing excess liquid refrigerant from returning to the compressor (floodback). One of the design features of the TXV is to separate the high pressure and low pressure sides of an air conditioning system. Liquid refrigerant enters the valve under high pressure via the system’s liquid line, but its pressure is reduced when the TXV limits the amount of this liquid refrigerant entering the evaporator.

The TXV – What It Does Do The thermostatic expansion valve controls one thing only:  the rate of flow of liquid refrigerant into the evaporator. Contrary to what you may have heard, the TXV is designed to control: Trying to use the TXV to control any of these system variables will lead to poor system performance – and possible compressor failure. How the TXV Controls the System As the thermostatic expansion valve regulates the rate at which liquid refrigerant flows into the evaporator, it maintains a proper supply of refrigerant by matching this flow rate against how quickly the refrigerant evaporates (boils off) in the evaporator coil. Hot Tub For Sale ConnecticutTo do this, the TXV responds to two variables: the temperature of the refrigerant vapor as it leaves the evaporator (P1) and the pressure in the evaporator itself (P2). Best Bathroom Scale For Accuracy

It does this by using a movable valve pin against the spring pressure (P3) to precisely control the flow of liquid refrigerant into the evaporator (P4): TXV Pressure Balance Equation P1 = Bulb Pressure (Opening Force) P2 = Evaporator Pressure (Closing Force) P3 = Superheat Spring Pressure (Closing Force) P4 = Liquid Pressure (Opening Force) Energy Transfer in the TXV Here is a closer view of the TXV in operation. Cheap Furniture Removals Perth WaThe flow of the liquid refrigerant is restricted by the valve pin. As the flow is restricted, several things happen: The pressure on the liquid refrigerant drops A small amount of the liquid refrigerant is converted to gas, in response to the drop in pressure This “flash gas” represents a high degree of energy transfer, as the sensible heat of the refrigerant is converted to latent heat The low pressure liquid and vapor combination moves into the evaporator, where the rest of the liquid refrigerant “boils off” into its gaseous state as it absorbs heat from its surroundings.

The pressure drop that occurs in the thermostatic expansion valve is critical to the operation of the refrigeration system. As it moves through the evaporator, the low pressure liquid and gas combination continues to vaporize, absorbing heat from the system load. In order for the system to operate properly, the TXV must precisely control the flow of liquid refrigerant, in response to system conditions. #39  of 67 brands of central air conditioners 27% of customers recommend What are the Best Central Air Conditioners for 2016? Read more about Rheem central air conditioners Read reviews of other Air Conditioner brands 13AJN 14AJM Classic Prestige RASL-JEC RSPM 13AJL RAKA RALB RAMB RSMA Contractors: Are you looking for Bought in spring of 2015 and got one summer out of it. had to pay for labor and Freon. Now it's the coils. I would never recommend We have had issues with the A/C and also the furnace since we boughtThe A/C keeps freezing and the temperature in the house rises

from warm air being forced through the house. continuously run because it never cools the air down in the house but Do yourself a favor and never purchase a Rheem. I purchased a Rheem heating/AC unit in November 2014 and my AC unit has already gone out this summer, it only worked for one summer. I have had problems from April to August 2016 with the coil leaking Freon; had a new coil installed and the new one leaked even more Freon than the previous one. The only way to contact them is by email. They just are the worst company ever, taking peoples' money and selling junk products. I had spent $3500 on this product, not to mention having an AC tech come look at what theAgain, do yourself a favor - don't purchase this product. is very frustrating when you spend money on a new item thinking it will last at least 10 years, but no, it goes out in less than two. I had to get a different AC unit and because of all the frustration I'm not sure

about this new AC unit I have from a different company. I did not choose the brand, my contractor chose it. In 2009 he had a Rheem installed in my home. I had to have the same part replaced 3And oh, believe me, the story gets worse. It quit cooling about 7They told me I had a leak in the coils and that it would cost about $1600 to repair. They put Freon that lasted about 7 weeks and then it stopped cooling again. They came over and we were going to put more Freon in it, but they couldn't because two more parts were messed up. One of them would cost about $500. retired and can only get money from my stock in September because that isSo here I am 98 in the shade, but I knew some that would get me another one. Had this unit installed 12/2010. This will be my third inside coil in 5Still under warranty, but not labor, parts only. No help on labor cost. At this rate, I'll need at least 2 moreLocal AC contractor said this is a known problem with

Would not recommend nor buy anything Rheem again. Moved into a new home in February 2015. Had to replace leaking coils in May 2016. Now 7 weeks later, the inside motor has gone out. Waiting 5 days toContacted Rheem by email. Our AC has been out for 8 weeks now, four trips by our service techs to try and solve the problem per Rheem information, but no joy. from Rheem customer service. Unit is 7 years old and under warranty. Will never buy one again. 100 degree weather this summer, no AC and Rheem could care less. Location: Rio Verde, AZ "Rheem is a rip off." I purchased our Rheem less than four years ago and now it is costing me $3,000 to put in new coils that are leaking. It cost me $1400 for two units, 4 ton and 3.5 ton. My contractor has quit installing them and has "Leaking coils - manufacturing defect inside and outside" Rheem has lousy customer service. Had to replace my inside coil unit last summer because of leaking Freon.