Question about Ruud UBHC Air Conditioner

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Ruud UBHC-17AOONFA heat exchanger

What function does a heat exchanger have when used with a boiler
in a hydronic, radiant, system installed in cement floor?

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Instead of air , it uses water to extract heat and send it thru the tubings.

Posted on Sep 04, 2008

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Recently purchased and moved into older home with a hydronic radiant heat system with boiler. Upon running the system in the colder temps, we are hearing a gurgling sound recurring in some of the runs


typically hydronic systems like that need to be bled, start with the highest radiator, the bleed valve have a little square head and you need to have a key that fits them, most supply HVAC houses have them sitting on the counter but you can ask them for one.

Jan 14, 2015 | Air Conditioners

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Ruud ubhc wiring manual blue


depending on ambient temperture there may not be enough heat in air to transfer into house that would be first stage. the auxilarry heat is second stage

Jan 16, 2014 | Ruud UBHC Air Conditioner

1 Answer

Where is the filter in ruud model UBHC-21J11NFC


It depends upon configuration- or how it was installed.

In general terms, wherever the air from the structure is being drawn into the cabinet for air recirculation/intake- the filter will be in the vicinity of the ducting connecting to the Ruud heat pump/AC.. It will be before the "A coil" assembly (the copper tubbing with fins roughly the shape of an "A".

This assumes it was installed correctly. If not, the A Coil will collect a thick layer of dust on the side facing the incoming air flow.

The relevent Ruud documentation is here:
http://www.ruudac.org.ua/ubhc02.pdf

If there is any doubt about the integrity of the installation, contact an HVAC contractor familiar with your area to inspect and make corrections if needed.

Apr 11, 2012 | Ruud UBHC Air Conditioner

1 Answer

My system uses a permenant air filter. It's missing. It's a Ruud Model UBHC-21J18SHG. What size filter should I put in this system?


The Ruud UBHC-21J18SHG has a nominally 21" cabinet width. So the needed filter is 19.75" x 21" x 0.375" (502 mm x 533 mm x 9.525 mm). The Ruud part number for the filter is 54-23217-03 .

The specifications sheet for the Ruud UBHC series air handlers is available here: http://www.coburns.com/images/PDFs/h22-517rev1.pdf . The filter size information is on page 3 and page 12.

I've found the filter at one online vendor: http://www.patriot-supply.com/products/showitem.cfm/RHEEM_68_101807_03 . (This is a common filter that fits several manufacturer's air handlers.)

I hope this helps.

Cindy Wells

Sep 10, 2011 | Ruud UBHC Air Conditioner

1 Answer

I have a RUUD central air conditioning system, model NBHC-18J20SFA. The cooling function is not working. The fan on the outdoor unit is not working. When switching to COOL, the compressor works for a few...


sounds like the outdoor fan motor and/or capacitor needs replaced. The compressor will run for a short time because the fan is not pulling the heat out of the system, it can cause damage to the compressor if the fan is not repaired, Ruud used a 3uf capacitor rating for the outdoor fan motor, if the motor has been changed make sure the proper capacitor is also changed for the new motor rating.

Jul 05, 2011 | Ruud UBHC Air Conditioner

1 Answer

Hi - I have a RUUD system, the heat won't come on


sounds like the "Fan/Limit" switch. It is to turn on the fan as the heat exchanger warms up. I believe it has failed. Check it out.

Hope this helps.

Feb 15, 2010 | Ruud UBHC Air Conditioner

1 Answer

Ruud UBHC AC System - Provides no Aux Heat


Tried this on my unit today, and observed the same results, but got Aux Heat (with A setting), if the H (blue wire) connected to B terminal, as per instructions for my 6036 Ritetemp. However, in this case, when the set temp is reached, I hear the click, but HVAC still blows aux heat indefinitely.

I also have RUUD UBEA 17J10..., and replaced my old honeywell with 6036, and can't get heat pump working. Both of my units are 14 years old, so I'm thinking to replace them soon.

Jan 06, 2010 | Ruud UBHC Air Conditioner

1 Answer

Ruud heat pump outside fan won't run


Tell him to make tight connections.

Jun 23, 2009 | Ruud UBHC Air Conditioner

1 Answer

Ruud achiever heat pump


the reversing valve needs power to switch to heat. more then likly the o wire is connected when it shouldnt be

Jun 15, 2008 | Ruud UBHC Air Conditioner

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