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Old 03-29-2009, 07:15 PM   #1
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Evaporator Coil Cleaning


What is the lowest temperature for running a heat pump in AC mode? I'd like to do a foam cleaning of the evaporator coil after a careful vacuuming. The temperature will be around 60 during the week.

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Old 03-29-2009, 07:26 PM   #2
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Evaporator Coil Cleaning


I never run a resident A/C below 70deg. Most brands recommend above 65 deg

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Old 03-29-2009, 07:39 PM   #3
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Evaporator Coil Cleaning


You can run them down to 50 deg F but you need a good steady load of 70 deg F in the house. In the colder climates we use a 50 deg F low ambient temp cutoff control. Make sure you rinse the coil with fresh water so no soap residue is left and check the drain port from the coil for blockage last.
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Old 03-29-2009, 09:19 PM   #4
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Evaporator Coil Cleaning


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Originally Posted by mjbxx View Post
What is the lowest temperature for running a heat pump in AC mode? I'd like to do a foam cleaning of the evaporator coil after a careful vacuuming. The temperature will be around 60 during the week.


You shouldn't have to run A/C to clean the coil.. For evap. coils I use a self rensing cleaner. I may take a sprayer & spray it with a little water If it's not used for a few days
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Old 04-01-2009, 12:22 PM   #5
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Evaporator Coil Cleaning


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Originally Posted by kenmac View Post
You shouldn't have to run A/C to clean the coil.. For evap. coils I use a self rensing cleaner. I may take a sprayer & spray it with a little water If it's not used for a few days
If you wash the coil, and don't rinse, or run the A/C to rinse it.
The cleaner can become covered with dust, and not rinse right later, when you use the A/C.

Causing more headaches.
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Old 04-01-2009, 12:36 PM   #6
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Evaporator Coil Cleaning


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Originally Posted by beenthere View Post
If you wash the coil, and don't rinse, or run the A/C to rinse it.
The cleaner can become covered with dust, and not rinse right later, when you use the A/C.

Causing more headaches.

Know what you mean.. Cleaned 1 this am. Alot of cat hair..Pulled the stuff off in shests. Then I used self rinse coil cleaner to Clean then run a/c
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Old 04-01-2009, 06:00 PM   #7
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Evaporator Coil Cleaning


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Originally Posted by kenmac View Post
You shouldn't have to run A/C to clean the coil.. For evap. coils I use a self rensing cleaner. I may take a sprayer & spray it with a little water If it's not used for a few days
Good answer Kenmac. That's what I do.
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Old 04-01-2009, 09:54 PM   #8
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Evaporator Coil Cleaning


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Originally Posted by beenthere View Post
If you wash the coil, and don't rinse, or run the A/C to rinse it.
The cleaner can become covered with dust, and not rinse right later, when you use the A/C.

Causing more headaches.
I plan on using the CAL-SPRAY "evap foam no rinse" evaporator coil cleaner. After spraying the evaporator coil, how long should I wait before turning the AC on to aid in rinsing? How long of a run time before the coil would be deemed fully rinsed?
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Old 04-01-2009, 10:46 PM   #9
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Evaporator Coil Cleaning


Before you use foaming spray.
better have some plastic. Yo prevent it from running on to the furnaces HX.

It tends to over flow the drain pan.

How long to let it on, depends on how dirty the coil is.

10 to 15 minutes run time, depending how humid the day is.
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Old 04-01-2009, 11:07 PM   #10
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Evaporator Coil Cleaning


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Originally Posted by beenthere View Post
Before you use foaming spray.
better have some plastic. Yo prevent it from running on to the furnaces HX.

It tends to over flow the drain pan.

How long to let it on, depends on how dirty the coil is.

10 to 15 minutes run time, depending how humid the day is.
The coil sits under the blower and above the filter rack. I have already vacuumed and brushed the coil and the fins don't look overly dirty. What would be an average foam spray set time according to this information? This Friday will have temps in the low 70's with relative humidity over 50%. Am I right to assume this would be an ideal time to run the heat pump in AC mode to aid in rinsing the coil?
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Old 04-02-2009, 04:12 AM   #11
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Evaporator Coil Cleaning


It should be a good time.

Can't predict how long it will take to clean, from a descrition.

What you call not overly, may be pretty bad.

You may be surprised at how much dirt is inbetween those fins.
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Old 04-03-2009, 11:09 PM   #12
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Evaporator Coil Cleaning


I cleaned the evaporator coil with CAL-SPRAY, http://www.acmeref.biz/public/acmepu...l_evapfoam.pdf "evap foam no rinse" evaporator cleaner. After much research, I found that the proper way to clean the evaporator coil for my upflow heat pump was from underneath the A-Frame. The outdoor temp was 75 and ideal for running the AC for thirty minutes to rinse the coil after applying the no rinse foam spray (allowing 10 minutes for foam to set on the coil). I went one step further by utilzing a garden hose to thoroughly rinse the evaporator coil from underneath. Done!
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Old 04-04-2009, 05:05 AM   #13
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Evaporator Coil Cleaning


One quick question.

Has anyone added refrigerant to the system i the last couple years.
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Old 04-04-2009, 09:27 AM   #14
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Evaporator Coil Cleaning


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One quick question.

Has anyone added refrigerant to the system i the last couple years.
No added refrigerant since sytem install. Why do you ask?
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Old 04-04-2009, 10:12 AM   #15
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Evaporator Coil Cleaning


Lots of techs gas and go systems that have dirt indoor coils. Because they are either too lazy to clean the coil, or don't know any better.

But, after the coil is cleaned, it can hurt the compressorif its over charged.

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