Question about Ruud Central System Air Conditioner

1 Answer

Not enough air flow coming from the vents on the second floor.

I would like to increase the air flow on the second floor of this two story house as there is only a trickle of air coming through the vents. The temperature is a good 4°C to 5°C cooler in the upstairs rooms than on the ground floor level (this is in Mid January).

I have checked the round disc plate inside the ducting on all the vents and they are all fully open. I have checked the loft insulation and that appears more than adequate. I just don't think that the air flow coming from the furnace is enough to reach the upper level of the house.

I am a new owner of this 30 year old house and confused about the performance of the furnace which is a RUUD 90 PLUS ACHIEVER, it appears to be about 10 years old.

Posted by on

  • 3 more comments 
  • Ken Harrison Jan 13, 2009

    It is an electronic filter and was just recently cleaned about a month ago.

    The further away from the furnace, the slower the air speed, until air movement from the outlets (registers) on the second floor is practically none existent.

    Thanks, Ken


  • Ken Harrison Jan 13, 2009

    I have tried to do that. I shut down 3 vents on the ground level, 2 in the basement (it is a completely finished basement) but no difference.

    The house is about 1850 ft² not including the basement, which could be another 1000ft²

    There are
    4 - vents in basement;
    10 - vents on ground level and
    6 - vents upstairs

    I also don't know the furnace btu rating; there is a blower performance chart inside the unit giving blower speeds vs Btu's and all models have 4 blower speeds, but it says it is for up-flow units only and I'm not sure which unit I have......documentation is practically none existant.

    Based on previous houses I have lived in this unit is either very quiet (which is an advertised feature) or it is running too slow.

    Thanks, Ken


  • mperez84 May 04, 2009

    I have a problem. I just installed a new 12 SEER Grandair 3 ton unit in my house. I have a zone system which has a thermostat in the main floor, and another thermostat in the upstairs bonus room. I have the main level thermostat set on cool at 73 degrees. I have the upstairs thermostat set at 76 degrees. The system freezes up completely. I know it is an air flow problem. I suggested to take out the doors from the zone system and have only one thermostat control the whole house to keep the unit from freezing up. Do you have a better suggestion??? ---HELP---

  • Ken Bledsoe May 11, 2010

    Have you changed the air filter on your furnace? ken

  • Ken Bledsoe May 11, 2010

    You might be able to shut down couple of vents that go to rooms you don't need that much heat in like kitchens. and maybe spare bedroom. That would give you more pressure to the open vents.

    Also how many vents do you have not counting return vents and how many square feet is your house?


×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 306 Answers

If you feel like increasing your blower motor speed you can do this. Go to the air handler take the cover off to expose the blower motor. You will see a circuit board that has the blower motor wires going to it. Using your flash light look at the board and locate the terminals that read Cool Heat Park ... Now the Cool terminal should have black colored wire going to that one. Now locate the Heat terminal if it has red going to it and maybe blue sitting on the park terminal then swap the two around, blue is like med speed on the blower. Where Red is low speed. This will increase the blower about 50 rpms. You can even read your blower motor and get the speeds more detailed. You have a big house your unit is I bet a 4 ton A/C and 125,000 btu furnace. Probably has 1600 rpm motor. This is one solution. You have a up flow model and when you open the furnace cabinet up you will be able to see the specs. on the furnace. Let me know how that goes ken here in Kansas

Posted on Jan 13, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Why can't I lower my honeywell 8500 below 67 on cool?


With a two story house you have to be aware that cold air flows downwards so any cold air coming from an ac unit will flow downstairs( normally down the stairway) so unless you can close off the down stairs then the up stairs unit will be cooling downstairs as well. Ac units have a thermostat located in the air intake and it cools until the cold air has risen to that point. In effect the space above the ac unit will be hotter than the floor. Knowing how they work ,you can see that the upstairs unit will never reach the set temperature because the cold air is continually heating from the house and will never get to the top thermostat.
So your solutions are
1-- fit controls that restrict the cold air from leaving the upper floor (Doors)
2--don't run the upper ac unit unless you are living up there (waste of money
)3 place an ac in each upper room and keep the room door closed

Aug 12, 2014 | Heating & Cooling

Tip

Keeping your whole home cool with central air.


Sometimes it is difficult to keep your home cool in the hot summer months. Also, some areas of your home may still be hot where other areas are too cool. Try this method to keep your home cool evenly throughout. Before you get started make sure your furnace filter is new. This will allow for maximum air flow.

If your living space is a single floor plan:

  1. Turn the air conditioning on
  2. Switch the furnace fan from auto to on.
  3. Measure the temperature in each room.
  4. Close the vents by about half in the cooler rooms
  5. This will force more cool air into the warmer rooms.
  6. Keep adjusting the vents until all the rooms have the same temp.

If your living space is on more than one level:

  1. Turn on the air conditioning.
  2. Switch the furnace fan from auto to on.
  3. On the lowest level of the house close half of the vents that are the closest to the stairs.
  4. This will force more cool air to the top floor where it is usually hotter.
  5. Cool air will sink from the upper floors which will keep the area near the stairs cool.
  6. Measure the temperature in all the rooms.
  7. Keep adjusting the vents until you have a nice even temperature throughout the house.
I found that leaving the furnace fan on all the time will keep your home evenly cool and comfortable. You may have to replace your furnace filter once a month due to the increased air flow. It will be well worth it in a cooler, more comfortable, and more energy efficient home.

Take Care,

Eric

on Aug 09, 2010 | Heating & Cooling

1 Answer

Weak air conditioner air flow and very hot upstairs.


Check the fans are all working ok and make sure there isn't a louvre closed in the duct

May 04, 2012 | Heating & Cooling

2 Answers

Sewer smell in house since installing the new toliet and the toliet gurgles when the washing machine is on. It started with the new toliet now the gurgling and smell is also present in another bathroom.


It sounds like a vent problem.
On top of each house is a vent stack.
There should be a vent stack above each toilet, and above kitchen sink.
Look for pipes sticking out of roof.
These pipes are open to the sewer line.
When you run a column of water down a drain, the vent stack lets air flow in front of and behind the column of water.
This air flow prevents the gurgling sound.
The gurgling sound is the drain water pushing air in front of it because of a clogged vent.
If you have a two story house, there are vents that run between floors to prevent the air flow from gurgling or bubbling sewer air into each drain as water column moves down pipe.

http://www.bradyinspects.com/plumbing-vents.html
http://chestofbooks.com/home-improvement/construction/plumbing/Standard-Practical/Venting-Part-3.html

Look for bird nest over vent pipe on top of house.
Run a snake down into pipe from roof and see if the is a stoppage.
You many need to call plumber to track down each vent and the cause.
For example if there are quick-vents installed inside a wall and the quick vent is no longer working.

You can also take advantage of fixya phone support.
Fixya expert will walk you through the steps for a price.

Dec 25, 2010 | Kohler Bath Highline K-11492-96 Biscuit...

1 Answer

Air flow out of A/C (HVAC) seems to be partially blocked. Noise increases with increased fan speed settings, but flow barely changes. Even on maximum setting the flow is not enough to reach driver or...


One of the Actuators for the doors inside your dash that controls and diverts air might not be working correctly. You may have to either replace the Actuator or Replace the A/C Heater Control. Your vehicle does not come with a Cabin Air Filter.

Jun 26, 2010 | 2004 Dodge Ram 2500

1 Answer

Heating blowing coo air downstairs and warm upstairs?


Some of this depends on where the air handler/furnace is located. Most often in two story houses, it's in the attic upstairs, or in a closet upstairs. A duct routes air from the furnace to the downstairs supply duct, so it is a distance from the air handler.
When the unit first initiates a heating cycle, that duct is going to be full of cool air, and the duct itself will be cool. So the furnace has to run long enough to push the cool air out, as well as warm the duct up, before your going to feel warm air at the registers downstairs.

Keep in mind, heat rises. And, your thermostat only monitors the immediate area where it's located. In your case, upstairs.
Two story houses are problematic because of this. And one way around it is to have a damper system installed that distributes the air upstairs or downstairs based on a thermostat located in those spaces. There would be 2 dampers, and 2 thermostats (one upstairs, one downstairs). Each stat would control a damper, and the call for heat or cooling.

Let me know if you would like to consider a system like this, and I can point you to components to use. I've put several system like this in.

Jan 26, 2009 | Kitchen Appliances - Others

1 Answer

Poor air flow from floor vents or when multiple vents choosen


There has to be something blocking the output somewhere. Check where vents come out to see if something has fallen down to block them.

Dec 05, 2008 | 2006 Honda Accord

Not finding what you are looking for?
Ruud Central System Air Conditioner Logo

5,107 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ruud Heating & Cooling Experts

Donni Steen

Level 3 Expert

659 Answers

Bill Long

Level 3 Expert

587 Answers

Tim Whalen

Level 3 Expert

3072 Answers

Are you a Ruud Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...