new unit not cooling

Old 04-16-16, 08:30 PM
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new unit not cooling

We just had a new 3 1/2 ton unit put in our house. And it doesn't seem to be blowing very hard. The guy that installed it is coming back Monday to make our return air vent bigger. I was just wondering if this might fix that problem, or could it be a problem with our vents in the attic? Thanks
Old 04-16-16, 08:56 PM
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I would verify that the thermostat Y wire connects to the furnace Y terminal along with a wire from the outdoor unit.

Bypassing the furnace Y terminal can result in a lower fan speed.( If the furnace has a Y terminal)

If you have a single speed outdoor unit and the furnace has a Y/Y2 terminal and a Y1 terminal we want to use the Y/Y2 terminal.
Old 04-17-16, 06:06 AM
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You say your new unit "doesn't seem to be blowing very hard" but what problem are you experiencing?
Are you comparing "blowing" on this unit with the old one or is it not cooling properly.
How does the new unit compare in size and capacity to the old one?

Could be as simple a problem as what Houston has suggested.

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