Had a new 2.5 ton heat pump installed today. Kept the old air handler inside. The A-Coil was replaced in the air handler 5-6 yrs ago.

Old system was R22 and this new heat pump is R410A. The replacement A-coil is R22 / R410A compatible.

There is a piston metering device on the A-coil. The A-coil came with a 67 piston. Today and going from R22 to R410A, the piston was changed out to a 63 piston.

The new system has been running for 2hrs now and the air temp from the vents is only 70 degrees and the thermostat is set to 77 but has been sitting on 79 degrees for two hours and won't go lower.

When the HVAC techs left 2hrs ago, they said it would take time for the system to settle in and work efficiently.

SO my question is, How long does it take a new heat pump to settle in ?? My home is a tiny 750sq ft ... that's right 750 square feet. Seems like a new 2.5 ton heat pump should be freezing me out. I just think the air temp should be lower than 70 degrees and cooling well below 79 degrees in the house by now, 2hrs later. It is hot today though. Currently 92 degrees outside.

Thank you for comments and consideration. Much appreciated !!!

Grandaire 2.5 ton Heat Pump



A-Coil



Air Handler

How are you measuring the discharge temp? I would think that discharge temp would be south of 60 degrees if the thermostat is reading 79.

Unless your house got REALLY hot, that does not sound right at all, I'd be calling them.

There were 3 techs here for the install today. The main guy has 31yrs experience with the same company. He's been in HVAC since the early 90's.

He said all the pressures looked good. He also checked superheat and subcooling. Said everything looked good. He had pulled a vacuum and said that was good too ... no system leaks at this time.

He said it would just take time for the new heat pump to settle in. But man, just over two hours now and still 70 degrees out of the vents in the house and thermostat will not drop below 79. Heat pump has been running continuously for just over two hours. I'm not having a good feeling about this at all.

quote:

Originally posted by stoic-one:
How are you measuring the discharge temp? would think that discharge temp would be south of 60 degrees if the thermostat is reading 79.

Unless your house got REALLY hot, that does not sound right at all, I'd be calling them.

Well, I don't have all the gauges to check temps. I just have a thermometer stuck up in one of the air vents and it's blowing 70 degree air inside the house. That and looking at the temps on the thermostat is all I can do.

EDIT: and after just over 2hours, the suction line is not beer can cold ... it is cool and slightly sweating.

quote:

EDIT: and after just over 2hours, the suction line is not beer can cold and sweating. Not at all.

That doesn't right, I'd call them.

quote:

Originally posted by stoic-one:

quote:

EDIT: and after just over 2hours, the suction line is not beer can cold and sweating. Not at all.

That doesn't right, I'd call them.

After I typed that thought about the suction line, I checked it again and edited my post.

The suction line is cool and slightly sweating at the heat pump, but not at the A-coil. Something isn't right but I don't have an idea how long to give a brand new heat pump to settle in. In another half hour and at the three hour mark, if nothing has changed ... still 70 air and 79 indoor temp ... I'll contact them.

Seems awfully large heat pump for the square footage

quote:

Originally posted by oldbill123:
Seems awfully large heat pump for the square footage

2.5 ton R22 was installed in 2005 and I bought this house in 2006. The house was built in 1945 and while I have new double pane windows, the remainder of the house likely isn't that well insulated.

I used a calculator online to figure if in fact 2.5 tons was too large. Based on my geographical location and elevation, the app figured out to 2.05 tons. So I could probably get by with a 2 ton unit but don't think 2.5 tons is drastic overkill ... but dunno for sure. I'm just a homeowner, not an HVAC tech.

quote:

Originally posted by oldbill123:
Seems awfully large heat pump for the square footage

Yes, seems about 1 ton too large to me

I had an 850 sq foot condo that got a HP replaced and they used a 1.5 ton unit, the smallest they could get.

Did I miss it? What's the outdoor temp?

My humble cottage build in 1945
Just me in retirement and a house dog live there

quote:

Originally posted by Krazeehorse:
Did I miss it? What's the outdoor temp?

Currently 94. High today expected to be 98

I've always seen the temp measured by putting a manual state inserted into the insulation duct coming out of the air handler about a foot above it if you can, there you will get a good reading of the temp the unit is creating.

Any deviation at the ducts in your rooms could be a reflection of the temps where the ducting is, if the ducting has any leaks, and the length of the duct runs, although at the size of the home that length shouldn't be a big issue.

quote:

Originally posted by HRK:
I've always seen the temp measured by putting a manual state inserted into the insulation duct coming out of the air handler about a foot above it if you can, there you will get a good reading of the temp the unit is creating.

Any deviation at the ducts in your rooms could be a reflection of the temps where the ducting is, if the ducting has any leaks, and the length of the duct runs, although at the size of the home that length shouldn't be a big issue.

Something just isn't right. Been running continuously for 3hrs and and air temp from the inside vents has not changed. Still 70 degrees and while the thermostat is set to 77, the room temp will not go below 79. 2.5 tons should be freezing me out of here and that isn't happening.

I just sent an email to lead tech that was here this morning and if I don't hear from him within the hour, I'll call the company office.

I would stop worrying about it being oversized .
And what the hell is this " settling in " business ?

quote:

Originally posted by selogic:
I would stop worrying about it being oversized .
And what the hell is this " settling in " business ?

Well I emailed the lead tech that was here this morning (31yrs HVAC experience) with my concerns. He just replied that he is currently out of town and asked that I call the office to get someone out. He agrees something isn't right and "it should have cooled down by now".

So I called the office, they took my name and number and I'm waiting for a call back. All the HVAC folks are very busy this time of year around here but I'll just have to see how important a new heat pump install and new customer is to them I guess.

An oversized unit in a small house will never be able to remove the humidity it should be removing when on AC mode because it will never get the chance to run long enough. That's always been my understanding of why they should be sized to the house properly.

quote:

Originally posted by PASig:
An oversized unit in a small house will never be able to remove the humidity it should be removing when on AC mode because it will never get the chance to run long enough. That's always been my understanding of why they should be sized to the house properly.

That's true but 2.5 tons in that size house , with stick framing , lots of windows and so so insulation ? I just don't think it's going to be an issue .

My point is, assuming somewhat accurate measurements, the blower duct temp should be at least 20 degrees below what is going in past the filter.

FTR, even if you assume it's over-sized, it should still cool. It'll just short cycle when comes to removing humidity.

The heat pump has run continuously for 4hrs now and the air from the inside vents has not changed ... still 70 degrees and the inside temp at the thermostat remains at 79.

Just got a call back from the HVAC company and they said they would TRY to get someone back over this afternoon but might be in the morning before someone can get back over.

In the mean time, running continuously just to hold a 79 indoor temp. My next power bill will be sky high ... maybe a little higher D'OH