07-29-2016, 06:20 PM
Brad,
First of all, my experience with Dometic units was on a previous Newell that we owned. It's been three years since I've worked on a Dometic. If you are truly blowing 35 degree air, keep an eye out for icing evaporator coil. Really, really cold air is a sign of LOW charge. The problem is the coil will ice, and the whole system goes haywire including overheating the compressor.
Jim, 23 degree delta is superb. Don't touch anything.
There are four ways to charge an AC unit. By volume, usually calculated by some pointy headed engineer like.....me. Two, byamperage, a direct indicator of load on the compressor, but less than ideal since it is dependent on temp and humidity.Three, by gauge pressures, which is HIGHLY variable based on ambient temperature, incoming air temperature, and humidity. Fourth, and the most accurate, is by superheat if an expansion valve system, and supercool if a capillary tube system. If you are going to be adjusting the charge in your AC units, take some time to read up on those two methods.
In todays home AC units which use blended refrigerants like 410, and achieve high SEER ratings, it is tough to just charge the refrigerant by gauge. Almost all techs trained in the last ten years were taught supercool and superheat.
The Dometic units are capillary design. The SCS units are expansion valve design.
First of all, my experience with Dometic units was on a previous Newell that we owned. It's been three years since I've worked on a Dometic. If you are truly blowing 35 degree air, keep an eye out for icing evaporator coil. Really, really cold air is a sign of LOW charge. The problem is the coil will ice, and the whole system goes haywire including overheating the compressor.
Jim, 23 degree delta is superb. Don't touch anything.
There are four ways to charge an AC unit. By volume, usually calculated by some pointy headed engineer like.....me. Two, byamperage, a direct indicator of load on the compressor, but less than ideal since it is dependent on temp and humidity.Three, by gauge pressures, which is HIGHLY variable based on ambient temperature, incoming air temperature, and humidity. Fourth, and the most accurate, is by superheat if an expansion valve system, and supercool if a capillary tube system. If you are going to be adjusting the charge in your AC units, take some time to read up on those two methods.
In todays home AC units which use blended refrigerants like 410, and achieve high SEER ratings, it is tough to just charge the refrigerant by gauge. Almost all techs trained in the last ten years were taught supercool and superheat.
The Dometic units are capillary design. The SCS units are expansion valve design.
Richard and Rhonda Entrekin
99 Newell, 512
Maverick Hybrid Toad
Inverness, FL (when we're home
)