Superheat subcooling Where can we find the superheat for a Delfield SSDTR1-SH. It is not in the service manual.

I don't use design pressures due to many variables such as ductwork, humidity, blower speed, o.d. temp, I.d. temp ect.... Learn SUPER HEAT AND SUBCOOLING values. Most guages give a pressure/ temperature relationship. At a pressure there is a temp that lines up with that pressure. If its r22 the temp is in the green and pressure is in the white(normally). If r410a temps in the pink. R22- Most evaporator are good between 40-50°F. If your coil is operating at 45°f your superheat value should be 10°-18°. Take the actual temp of the suction line(large copper line that's cold) and subtract that # from the temp on your gauge. The value should be 10-15°. Same on the liquid line. You o.d. coil is usually 90-105°F. The liquid line temp(small copper tube that's warm) subtracted from the pressures temp gives you the SUBCOOL value.
R410a? Subccoling
R22? Superheat and subcooling
If it has an expansion valve? Sub cooling
This method is used to take all the guesswork out of the scenario. BUT! Most of the machines will have a data plate that gives great info for this method. But some only give it in the owners/installation manual. You won't get a good answer to your question but this is the correct way all HVAC technicians SHOULD check freon levels and is the only way if we are achieving designed efficiency. If you know its low on freon, again most coils are "happy" between 40-50°F(68-84psig). And at that temp your high side should be 90-105°F(168-210psig). And again, so many variables! I usually shoot for 95°f o.d. temp, 80low 210high psig and 10° SH 12-18°SC.

Normally if it does not sound right, it is not right. By your discription it sounds like your compressor is having a problem with flood back caused by a txv not metering properly, or an overcharged system. You will need a tech who can determine superheat and subcool for your refrigerant system. Find a tech who can determine these values. Superheat and subcool is normally around 8 -12 degrees. Superheat is the amount of additional heat the refrigerant picks up in the evaporator once it is turned to gas and is needed to keep liquid refrigerant from flooding back to the compressor. Compressor are designed to compress gas not liquid. Subcool is the additional cooling refrigerant undergoes once the refrigerant turns back into into liquid in the conderser. Subcool ensures the refrigerant remains in liquid form until it reaches the metering device. Only liquid suppied metering devices will pass the required amount of refrigerant to achieve the rated cooing or heating rates. If it is liquid flood back, your compressor will be damaged and will need to be replaced. Hope this helps

You need to to determine the superheat and subcooling to check for the proper operation of your system when the compressor is running. I ran into a case just yesterday, the breaker kept tripping. Unit had the same readings as yours. This one had a subcooling of >25 degrees and 0 degrees superheat indicating unit was overcharged. I took an extra 8 pounds of r22 out of the system. During the investigation I also determined the filter/drier was blocking the refrigerant flow causing the technician to overcharge the unit. To check filter/drier performance all you need to do is measure the upstream and downstream temperature. The difference should be less than 2 degrees. This one was 7 degrees indicating it was metering flow. If your compressor stops operating before determining superheat and subcooling, you can get a professional tech to recover and weigh out the refrigerant in your system. You can look on the nameplate data on the side of the outside unit and see the ounces of refrigerant it is charged. If the compressor is operable go ahead and adjust charge by recovering the excess refrigerant into a recovery container for that refrigerant. Normal superheat and subcooling is normally around 10 - 15 degrees.
Hope this helps

Get a high velocity air filter, not a pleated one. Check air into evaporator section clean and passing air well. Next, check proper operation of blower motor and wheel. Next, check for proper charge by performing a superheat and subcool calculation. You will need a repairmant to check these. Superheat and subcool will tell you if your unit is properly charged and if you metering device is working properly. A typical superheat and subcooling value is around 10 to 15 degrees.

superheat is the difference of line temperture at suction of the compressor to the pressure converted to temperture for freon used in system. subcooling is the difference of temperture measured on liquid line compared to pressure measured at discharge line converted to temperture for the freon used in system.

http://www.delfield.com/docs/uploaded/del/manuals/archive/dm6000.pdf
Start with this site as it has your manual. Check it out and if it does not get you going, get back to me.
Hope this helps.

it is fine and sounds like it is running at a high efficentcey. I wouldnt worry about it as long as it dosent cycle too much.

http://www.delfield.com/docs/uploaded/del/manuals/V13%20Manual2.pdf
try this web site and check out the manual. It may be of some help to you

I assume r-22 refrigerant by the pressure... you have a saturate temperature of approximately 41 degree and 71 degrees at the service port this equates to a 30 degree superheat. a condenser saturation temperature of 105 degrees and since the liquid line temp at the service valve is not given only the enterin indoor coil on the liquid line a 96 degree temperature this would equate to a subcooling temperatureof about nine degrees. You have too high of a superheat reading. verify that the bulb for the txv is correctly positioned and insulated. if it is then you need to remove the bulb from the suction line, hold it in your hand to warm it up and see if the superheat changes. you could also have issues with your ductwork. If the supply temperture is around 50-55 degrees then the unit is doing all it can.. Check the txv and the ductwork as the subcooling indicates that the condenser side is doing it's job, but the superheat readings indicate that you are starving the evaporator..

Subcooling - The difference between the temperature of the Small copper line (Liquid Line) and the high-side (red) gauge temp on your manifold

Superheat - The difference between the temp. of the Suction line (Big copper) and the low side gauge (blue) temp