I have my coach in for oil/filter change and routine service. My dash a/c is just not cooling properly. The tech asked me what the correct gas pressures should be on the dash a/c system when everything is working properly. Tomorrow he is going to charge the system to proper levels then start troubleshooting. I am in Vermont in 70 degree daytime weather but will be heading south into warmer climates in September. What pressures should I give to the tech?
Thank you in advance
Same as any automotive-type system with your same refrigerant. Nothing special about a motorhome dash A/C.
Assume it is R134A. Plenty of charts on-line. Look up for your ambient temperature.
Think if the "tech" had to ask you I would find one a little more knowlegdeable,what is he not asking you.
There's too many different system designs out there to have exact operating pressures and temperatures. The "rule of thumb" I use for years on the high side pressure is ambient temp x2 plus 30 will get you close in what the reading should be and if I got anywhere of 30 to 50 degrees lower out of the dash vent than outside ambient temp I call it good. FYI, your high side should never be over 250lbs but here in 118 degrees summers it's hard to maintain that rule with some equipment.
The biggest thing I see today with older cars and RV's is that their system have contaminants such as air or junk, wrong size of compressor, no oil or to much oil, low refrigerant or to much and plug up evap coils or fan blade.
Bottom line if the tech is asking you for operating parameters I would to be concern.
Steve
Steve Knows his stuff... Fixed my AC and its still kickin cold air!!
Been busy with the Grand baby but next time we are down Ill call you for lunch
I misunderstood the question from the tech. He was asking how many pounds of refrigerant total did the system need if starting at zero. Brad at Foretravel said 6 pounds. My mistake.