Papa Bob
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Fishinghat wrote: Blower on low says it all. You aren't moving enough air thru the coils to keep ice from forming and blocking the flow of air. Turn the fan to high and keep it there. Turn the temperature on a warmer setting until some of the moisture is removed from the air, then you can turn the temperature to a slightly lower setting. Keep moving it down until you reach the temperature you want. JMHO
The blower speed has nothing to do with ice forming on the condenser coils. Turning the temp setting to a warmer setting allows the ice to melt between cycles, and the air moving over the coils faster melts the ice faster, but all this does is hide the real problem, which often low refrigerant charge.
Fishinghat wrote: Blower on low says it all. You aren't moving enough air thru the coils to keep ice from forming and blocking the flow of air. Turn the fan to high and keep it there. Turn the temperature on a warmer setting until some of the moisture is removed from the air, then you can turn the temperature to a slightly lower setting. Keep moving it down until you reach the temperature you want. JMHO
The blower speed has nothing to do with ice forming on the condenser coils. Turning the temp setting to a warmer setting allows the ice to melt between cycles, and the air moving over the coils faster melts the ice faster, but all this does is hide the real problem, which often low refrigerant charge.
Correct and not correct. Blower speed has NOTHING to do with ice on the Condensor. But Blower speed CAN affect freeze up on the EVAPORATOR Low Fan speed will cause a freeze up on a Roof AC without freeze controls because the air is moving SLOWER thru the coils and the air is NOT removing the cold from the evaporator. You will get colder air thru a AC system on lower fan speeds because the air has a "longer" time to get cold. Humidity also has a big affect on Freeze ups. Doug
Fishinghat wrote: Blower on low says it all. You aren't moving enough air thru the coils to keep ice from forming and blocking the flow of air. Turn the fan to high and keep it there. Turn the temperature on a warmer setting until some of the moisture is removed from the air, then you can turn the temperature to a slightly lower setting. Keep moving it down until you reach the temperature you want. JMHO
The blower speed has nothing to do with ice forming on the condenser coils. Turning the temp setting to a warmer setting allows the ice to melt between cycles, and the air moving over the coils faster melts the ice faster, but all this does is hide the real problem, which often low refrigerant charge.
Correct and not correct. Blower speed has NOTHING to do with ice on the Condensor. But Blower speed CAN affect freeze up on the EVAPORATOR Low Fan speed will cause a freeze up on a Roof AC without freeze controls because the air is moving SLOWER thru the coils and the air is NOT removing the cold from the evaporator. You will get colder air thru a AC system on lower fan speeds because the air has a "longer" time to get cold. Humidity also has a big affect on Freeze ups. Doug
Correct and not correct. A properly installed and functioning air conditioner can operate without freeze ups indefinately on the low fan speed.
I'll share my experience.
My new TT has a Dometic 15K ducted unit. When I first got it, the evap coil was icing. I found, as Doug has mentioned, that the freeze-sensor had dislodged from the evap coil. I re-installed it and have had no icing since.
I even run the air on low speed for the entire day and still no icing.
While I was working on the unit, I also noticed that the factory didn't seal the area between the supply air and return air very well and the foam tape was pulling away from the sides of the plenum.
I re-sealed this area and I could notice a considerable drop in supply air temperature.
In my service experience over the years, the main problems I found with units icing up has been the two problems I mentioned above and dirty filters and dirty evaporator coils.
I have rarely found low refrigerant charges.
In a properly operating air-conditioner that has been properly maintained by cleaning, the unit should work fine on the low fan setting.
Steve
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My issue was identical to Javaseuf's. The freeze sensor was never installed and there were leaks between the intake and discharge. I installed the freeze coil and taped up all the leaks with foam backed aluminum duct tape and haven't had a problem since.
I contacted Dometic about the freeze coil and it should be placed in the center of the evaporator as close to the bottom as you can get. There is even a cutout for it. It's about the size of a stack of quarters.
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Low Fan speed will cause a freeze up on a Roof AC without freeze controls because the air is moving SLOWER thru the coils and the air is NOT removing the cold from the evaporator. You will get colder air thru a AC system on lower fan speeds because the air has a "longer" time to get cold. Humidity also has a big affect on Freeze ups. Doug
