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Heil 2.5 tons Heat Pump Air Handler Heil 2.5 tons Heat Pump Air Handler
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Old 06-22-2008, 09:37 AM   #1
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Heil 2.5 tons Heat Pump Air Handler
Drain line no water come out.Water suck back to the coilc.Negative pressur.I check a fan diretion is corect.

What wrong???Please HELP

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Old 06-22-2008, 03:46 PM   #2
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Drain line no water come out.Water suck back to the coilc.Negative pressur.I check a fan diretion is corect.

What wrong???Please HELP
What kind of mechanical contractor are you?

Did you take the knockouts out?

Is the drain line blocked?

Whats in the drain pan?

Is the coil level or leaning backwards?
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Old 06-22-2008, 03:54 PM   #3
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Quote:
Originally Posted by Roger Cali View Post
Drain line no water come out.Water suck back to the coilc.Negative pressur.I check a fan diretion is corect.

What wrong???Please HELP
Negative pressure on the drain line can often mean that you don't have a trap or a trap of the proper weir dimension on the drain line. Veturi effect.
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Old 06-22-2008, 09:12 PM   #4
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mechanical contractor.
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Originally Posted by Roger Cali View Post
Drain line no water come out.Water suck back to the coilc.Negative pressur.I check a fan diretion is corect.

What wrong???Please HELP
3/4 inch PVC.drain line w/Trap.

Knock_out OUT.

Drain line is clear.

Coils level ( down hill/not leaning backwards.)

Water run douwn between the fins,into the pan,at near end of drain line and the pan water pullup out of the pan.


If opened the panel cover,water run down to the drain line.


Can some one Help me out.Thank
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Old 07-05-2008, 11:46 PM   #5
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To Hvacmangod
Dear Hvacmangod.

I do not think you need to known a real problem.All of a mechanical contractors they known their trade.

Just try open more supply line also try open one more drain line.

I hope your systerm will work well.
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Old 07-26-2008, 01:26 PM   #6
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adjust the fan speed on air handler. you only need 400cfm per ton.
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Old 07-26-2008, 07:02 PM   #7
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I'm just eaves dropping on your conversation, but am curious about the 400cfm/ton comment. If the fan speed is too great, will that cause the negative pressure in the AHU? And also, how would that effect the cooling system in general (i.e. outlet temp would be higher but greater quantity-so does it still take longer to cool home)?
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Old 07-26-2008, 07:12 PM   #8
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WTF is up with all the new users with only like 2 or 3 posts, not making any sense, and with just about the same names....
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Old 07-26-2008, 07:42 PM   #9
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If the drain is properly trapped then you are hurting for air (not enough return) my improper english using friend. Whats with the alter ego answer? Stevie wonder could see that relationship.
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Last edited by MechanicalDVR; 07-26-2008 at 07:44 PM.
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Old 07-26-2008, 08:06 PM   #10
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And where are the pictures?
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