At what temperature does POE oil breakdown?

Mineral oil will start to decompose at approximately 350ºF (400ºF for POE oil). As temperatures increase above this threshold, the oil starts to polymerize.

What should compressor discharge temp be?

The compressor's discharge temperature should be measured about 1 to 2 inches away from the compressor on the discharge line. This discharge temperature should never exceed 225°F. Carbonization and oil breakdown can occur if compressor discharge temperatures exceed 225°.

At what temperature does R134a condense?

For a simple circuit, using the working fluid Refrigerant R134a, evaporating at −5°C and condensing at 35°C, the pressures and enthalpies will be as shown in Fig. 2.3: Enthalpy of fluid entering evaporator =249.7 kJ/kg. Enthalpy of saturated vapour leaving evaporator =395.6 kJ/kg.

What causes high compressor discharge temperature?

What causes high discharge temperature? High discharge temperature is the result of temperatures in the compressor head and cylinders becoming so hot that the oil loses its ability to lubricate properly. This causes rings, pistons and cylinders to wear resulting in blow by, leaking valves, and metal debris in the oil.

What is compressor sump temperature?

Oil sump temperature for the SO compressor working in a superheat range from 10 K to 30 K for propane and R407C.

Adding POE Oil for and R407c Retrofit

What is oil sump temperature?

A quality conventional motor oil will tolerate oil sump temperatures of up to 250 degrees, but starts breaking down over 275 degrees. The traditional approach is to try to hold oil temperatures between 230 and 260 degrees.

Why should the temperature inside the compressor be kept under 300 F?

If the temperature at the discharge port exceeds 300 degrees Fahrenheit, the refrigerant oil and adjacent mechanisms will suffer. For the health of the air compressor, the temperature at the discharge line should never exceed 225 degrees Fahrenheit.

What is a normal discharge pressure?

Since at the discharge of the refrigeration compressor the condenser is located, normal discharge pressure can also be defined as the pressure at which the refrigerant condenses with specified amount of sub-cooling at the available cooling utility.

What is normal discharge superheat?

If you have come across a unit that has locked out on a Discharge Superheat fault, it is a good starting point to know what the ideal Discharge Superheat at standard cooling operating conditions should be (15-25K).

What does bubbles in sight glass mean?

Seeing bubbles in a sight glass is one of the indications that there is a problem with the refrigerant level that needs to be addressed. Sight glasses are used to detect refrigerant levels. Let your unit warm up. Units that have just started working or are under a low load may show bubbles, and this is normal.

What is the condensing temperature?

The condensing temperature of the compressor system usually refers to the temperature at which the refrigerant condenses in the condenser. The vapor pressure of the refrigerant corresponding to the temperature is the condensing pressure.

What is the condensing temperature of R-22?

The influence of the evaporator temperature on the volumetric refrigerating capacity (VRC) at the condensing temperature of 50 o C for R22 and the two alternative refrigerants is shown in Fig. 9.

Can you use a pure liquid as a refrigerant?

A long-term alternative is natural refrigerant. Water stands out as a natural refrigerant because it has no GWP or ODP and is neither flammable nor toxic. When used in a refrigeration system, it occurs in the liquid and gaseous states.

What is the problem when the superheat reading is too high?

Excessive or high superheat is an indication of insufficient refrigerant in the evaporator coil for the heat load present. This could mean that not enough refrigerant is entering the coil or this could also indicate an excessive amount of heat load on the evaporator coil. pressures will be lower than normal.

How do you calculate super heat discharge?

The discharge superheat is calculated the same way as any other superheat/ subcool on a system. By measuring the discharge superheat you can subtract the suction superheat and that then leaves you with a figure of how much superheat the compressor has given through compression and mechanical /electrical inefficiencies.

What is a good superheat for 410a?

Most heating and cooling systems should operate at a superheat of 10F at the evaporator and between 20F to 25F at the compressor. if your HVAC system has a thermostatic expansion valve (TXV), the subcooling should be between 10F and 18F.

Why is my discharge pressure so high?

One common cause of high discharge pressure is the cooling medium (air or water) flowing across the condenser: either there is not enough or the temperature of the cooling medium is too high. This is normally easy to identify with a simple visual inspection of the condenser.

What causes high condensing pressure?

If condensing pressure is higher than normal with adequate water flow, (temperature of the water exiting the condenser lower than normal) it may be assumed the condensing surface is fouled. It must next be determined whether the fouling is on the inside or outside of the tubes.

How do you fix high discharge pressure?

One of the causes that have been established in relation to high compressor discharge pressure is the presence of air in the system. When this takes place, your best solution is to recharge the system. Another is a clogged condenser in which case you will need to clean the condenser so that it will function properly.

What is the most common cause of compressor failure?

Overheating is a common cause of compressor failure, and there are many factors at play. If direct sunlight falls on your outdoor unit and there is inadequate ventilation around it, it makes your unit's compressor overheated. High voltages can also damage the motor causing the compressor to overheat.

Should a compressor be hot to touch?

As the process of the compressor heating up is a normal step in the process of cooling down a fridge you should expect it to get warm, but not scalding hot.

How do you stop a compressor from overheating?

What temp does synthetic oil breakdown?

Regular oil starts to burn between 350 - 450 degrees F, While synthetic oil can continue to function at over 500 degrees. Sometimes piston/ring temperatures can rise to over 500 degrees under loads.

What temperature does motor oil boil?

The hydrocarbons in this oil have carbon numbers ranging from C9 to C20 and boiling points ranging from *163 to *357*C (325 to 675*F).

What temperature is 15W40 good for?

“Diesel has the widest performance range with 5W40,” says Mark Betner of Citgo. “Its starting temperature range is down to minus 22 F (compared with 15-plus with 15W40) up to 122 degrees F (same as 15W40).