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DIY Home Repair Forum: HVAC 04-10-2012, 07:06 PM
Replies: 2
Views: 890
Posted By classic
This is a situation that you need a professional...

This is a situation that you need a professional evaluation - you need what the business referrs to as a Manual J heat gain-loss calculation. The furnace deals with the heating (heat loss) side,...
DIY Home Repair Forum: HVAC 04-10-2012, 06:49 PM
Replies: 4
Views: 820
Posted By classic
rusted/clogged coil

If the coil gets blocked up every summer you might want to try a 4 to 1 mixture of lemon flovored clorox and water into the drain pan each summer. This will kill any residual mold in the pan and...
DIY Home Repair Forum: HVAC 10-21-2010, 08:21 AM
Replies: 12
Views: 6,361
Posted By classic
wet filter

You need to find out why the filters were wet in the first place. There is no reason for moisture getting into the return ductwork.

There must be some air leakage in the return side for water to...
DIY Home Repair Forum: HVAC 10-20-2010, 06:29 PM
Replies: 6
Views: 2,797
Posted By classic
dust

Slove the problem first!

Where is the dust comming from in the first place?

A proper HVAC system is a closed system - air is pulled across the filter where it is cleaned, goes to the unit where...
DIY Home Repair Forum: HVAC 10-20-2010, 06:02 PM
Replies: 6
Views: 1,293
Posted By classic
design problem

An excellent rule of thumb for return sizing is filter length x filter width x 2 = capacity, so 20 x 25 x 2 = 1000 cfm and 18 x 18 x 2 = 648. You have a nominal capacity of 1648 cfm and a 5 ton unit...
DIY Home Repair Forum: HVAC 10-20-2010, 05:44 PM
Replies: 12
Views: 6,361
Posted By classic
Just because you charged and old unit in spring...

Just because you charged and old unit in spring does not mean it is still charged properly.

Does the air velocity still feel the same?
DIY Home Repair Forum: HVAC 10-20-2010, 05:33 PM
Replies: 2
Views: 1,966
Posted By classic
insulation

if this is loose insulation in an unlined return, the return suction pressure has pulled the insulation in from the attic or walls. This means that your return trunk is not airtight and your...
DIY Home Repair Forum: HVAC 10-20-2010, 05:22 PM
Replies: 3
Views: 3,109
Posted By classic
duct leakage

Assume that you have a 2 1/2 ton air handler that moves 1000 cfm of air.
Now assume that you are loosing 20% (200 cfm) of this air under the house thru duct leakage. 1000 cfm is being sucked into...
DIY Home Repair Forum: HVAC 10-20-2010, 04:58 PM
Replies: 1
Views: 559
Posted By classic
burner shutdown

1) if oil filter gasket is not 100% tight air can get into the line and shut it down

2) same for all oil piping connections

3) cad cell could be getting weak

4) dirty/blocked oil filter
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