Great Video... helps me to understand the control mechanism. At around 18 minutes... you show the math of 91-67 psig as 14 psig, but I think you may have wanted it to show 24 psig which was giving you a 14F temp difference across the evaporator. However, I still get the points and its a great tutorial!
+Jim Moudy ; nice catch Jim and a flaw that can could be crucial in keeping the balanced pressure. Great video and happy to see this simple math error caught so quickly.
what i am looking for is an explanation on how a non-heat pump ac unit protects itself against a evaporator icing is it like have a separate thermostat in the evaporator which breaks contact with the compressor contactor . Because the simplest way i can see is have a simple thermostat switch that checks the evaporator temperature range... like a fan limiting switch in a furnace
in straight cool systems around here there is no protection beyond a low pressure switch in the condenser. Under normal operating conditions it is not an issue as long as the temperature you are trying to achieve is reasonable and you have adequate return.
Talking about an explanation of a conventional ac unit which would be most car , window units , and ac non-heat pumps. Back in the day they ice up in colder then normal conditions but now you don't see that happening all that much curious what is protecting this
Great Video... helps me to understand the control mechanism. At around 18 minutes... you show the math of 91-67 psig as 14 psig, but I think you may have wanted it to show 24 psig which was giving you a 14F temp difference across the evaporator. However, I still get the points and its a great tutorial!
+Jim Moudy ; nice catch Jim and a flaw that can could be crucial in keeping the balanced pressure. Great video and happy to see this simple math error caught so quickly.
Jim Moudy
excellent training video, looking forward to more. Russ Mitchell
Interesting stuff. Thanks Ron.
what i am looking for is an explanation on how a non-heat pump ac unit protects itself against a evaporator icing is it like have a separate thermostat in the evaporator which breaks contact with the compressor contactor . Because the simplest way i can see is have a simple thermostat switch that checks the evaporator temperature range... like a fan limiting switch in a furnace
in straight cool systems around here there is no protection beyond a low pressure switch in the condenser. Under normal operating conditions it is not an issue as long as the temperature you are trying to achieve is reasonable and you have adequate return.
Talking about an explanation of a conventional ac unit which would be most car , window units , and ac non-heat pumps. Back in the day they ice up in colder then normal conditions but now you don't see that happening all that much curious what is protecting this
Well done. Helped alot
i have a problem with our refrigeration system onboard ship ,i can not reach -20 degrees celsius, what would be the problem?
Ron, Good Stuff
S Sam Thanks Sam!
should that be 24 psig
91-67 the gas difference = 24 not 14
This is expansion valve
91-67= 24