Gas and Oil Home Heating Furnaces - frozen air handler
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huayra
06-16-02, 02:05 PM
My AC is not cooling correctly, i have 2 problems:
1- The AC does not cool enough. The blower does not work at high speed, so the air handler is building ice but the cold does not go inside. I turn off and on the AC, and then, the blower increases speed coolong thr interior of the house quicly.
I recently changed the circuit that controls the blower (ICM).
$ 265 for the little pice of wires.
2- I live in Florida - hot and humid right now -. the air handler is condensing lots of water, that wets the exterior and even the air filter. that plus the ice building from problem 1.
I wonder if that is normal. I am worried that that much water will corrode the unit.
I have a TRANE AC 5 TONS. TWE065E13FADxxxx
1- The AC does not cool enough. The blower does not work at high speed, so the air handler is building ice but the cold does not go inside. I turn off and on the AC, and then, the blower increases speed coolong thr interior of the house quicly.
I recently changed the circuit that controls the blower (ICM).
$ 265 for the little pice of wires.
2- I live in Florida - hot and humid right now -. the air handler is condensing lots of water, that wets the exterior and even the air filter. that plus the ice building from problem 1.
I wonder if that is normal. I am worried that that much water will corrode the unit.
I have a TRANE AC 5 TONS. TWE065E13FADxxxx
otter_
06-16-02, 02:39 PM
in your air handler. Ice can be caused by restricted air flow, dirty evap coil, dirty condenser, low freon or low blower speed.
Sounds like your blower circuit is wired wrong. Should be switching from off/low to high when your a/c kicks in.
Sounds like your blower circuit is wired wrong. Should be switching from off/low to high when your a/c kicks in.
lynn comstock
06-17-02, 02:48 AM
Low airflow or Low refrigerant flow in the evaporator OR BOTH cause the low indoor coil temperatures that cause the indoor coil to freeze up.
1) Your air handler has an electronically controlled fan speed. Your new ICM board controls the speed of the fan and the fan speed should be 400 cfm per ton based on the OUTDOOR unit tonnage. The board has LED lights that flash codes. The instructions are pasted on the blower wheel. One of the flashing lights tells you the fan speed setting. (The factory default is the highest speed…2000cfm.
See what the setting is. See what your outdoor unit tonnage is. WITH THE POWER OFF, set the dipswitches to the setting that will deliver 400 cfm per ton. Turn it back on and the FAN SPEED setting is resolved. You still may not have dealt with the underlying problem.
2) Run the system and check the indoor coil for icing every 10 or 15 minutes until the freezing STARTS. Look at the freezing area of the coil. IS THE ENTIRE COIL FREEZING OR IS ONLY A PART OF THE COIL FREEZING?
3) IF the coil icing is TOTAL at the START, the airflow is low. Check the indoor coil with a light and a mirror to see if the fin spaces are clogged with dirt. If so the coil needs to be pressure washed with soap and water to drive the embedded dirt out of the coil.
4) IF the coil icing is PARTIAL at the START, the indoor coil is not getting enough refrigerant because:
............. A) Your system is low on refrigerant (most likely reason) or
..............B) Your metering device (expansion valve) is not operating correctly.
5) The solution depends on the underlying cause (steps 3 or 4). You could handle the cleaning (step3…full coil icing pattern) IF you can find a way to contain the cleaning water so as not to damage the equipment components or the house. The solutions to step four (partial icing pattern) require an EPA certified technician.
ABOUT THE WATER CONDENSING PROBLEM: This problem may be a part of the freezing problem. Can't tell until the freezing issue is resolved.
1) Your air handler has an electronically controlled fan speed. Your new ICM board controls the speed of the fan and the fan speed should be 400 cfm per ton based on the OUTDOOR unit tonnage. The board has LED lights that flash codes. The instructions are pasted on the blower wheel. One of the flashing lights tells you the fan speed setting. (The factory default is the highest speed…2000cfm.
See what the setting is. See what your outdoor unit tonnage is. WITH THE POWER OFF, set the dipswitches to the setting that will deliver 400 cfm per ton. Turn it back on and the FAN SPEED setting is resolved. You still may not have dealt with the underlying problem.
2) Run the system and check the indoor coil for icing every 10 or 15 minutes until the freezing STARTS. Look at the freezing area of the coil. IS THE ENTIRE COIL FREEZING OR IS ONLY A PART OF THE COIL FREEZING?
3) IF the coil icing is TOTAL at the START, the airflow is low. Check the indoor coil with a light and a mirror to see if the fin spaces are clogged with dirt. If so the coil needs to be pressure washed with soap and water to drive the embedded dirt out of the coil.
4) IF the coil icing is PARTIAL at the START, the indoor coil is not getting enough refrigerant because:
............. A) Your system is low on refrigerant (most likely reason) or
..............B) Your metering device (expansion valve) is not operating correctly.
5) The solution depends on the underlying cause (steps 3 or 4). You could handle the cleaning (step3…full coil icing pattern) IF you can find a way to contain the cleaning water so as not to damage the equipment components or the house. The solutions to step four (partial icing pattern) require an EPA certified technician.
ABOUT THE WATER CONDENSING PROBLEM: This problem may be a part of the freezing problem. Can't tell until the freezing issue is resolved.