Type: Posts; User: deme
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On my Carrier heat pump, defrost is a function of time and outside coil defrost thermostat.
The thermostat is set to close its contacts at 30*F (to initiate a defrost cycle at the appropriate...
I had two 'buzzing' problems.
The first one was a loud one occasionally coming out of the heat pump condenser. Opened the beast up and traced the noise to the reversing valve coil. Put my finger on...
I got my curves from the Carrier Product data booklet for the Carrier 38YXA heat pumps. Mine is a 2 ton unit and the following curves give information for 2, 2.5, 3, 3.5, 4 and 5 ton heat...
There are several ways to determine the setting of the balance point. Here is how I did mine:
I used the heatpump output curves to determine output for 30*F, 35*F and 40*F outdoor temperatures...
I run my Lennox G60DFV furnace off a Generac XL4000 4,000 watt generator during infrequent power outages.
I have an approved single circuit manual transfer switch connected to the house electric...
I'm not a pro but the calculation is straightforward.
All types of energy can be converted from one form to another.
In this calculation I'll express electric energy in terms of THERMS.
The following paper deals with dehumidification when neither heating nor cooling are required.
The installation instruction book for my Carrier 38YXA heat pump describes the thermostat which (along with the timer) initiates a defrost cycle.
This thermostat closes its contacts to enable a...
I am aware of the high price of electricity in Ontario. You poor people are paying for the sins of several past governments and of Ontario Hydro.
The cost per kwh I mentioned was the total cost...
I did a calculation on costs for my house some time ago. The arithmetic is pretty detailed but not complicated.
You may have to do some unit conversions because I used Candian information.
What is the cost difference between air conditioning only and a heat pump (which also provides air conditioning)?. While all the other advice is relevant, the above cost difference should govern in...
Sparking, which generates random radio frequency waves, at brushes of a commutator motor is not so rare. You don't need a psychiatrist and it's not aliens.
Clean commutator and make sure brushes...
I don't know if this applies in your case but regardless of the lockout setting, the furnace will operate when the system calls for a defrost.
The regular owner's manual doesn't explain the lockout setting. You need the following pamphlet:
Programmable Dual Fuel Thermostats. Installation, Start-Up, and Operating Instructions.
1760 sq. ft. rancher in Vancouver B.C. area, just North of Blaine Wa.
Replaced old 19 year old gas furnace in June/03 with 80% efficiency gas furnace.
Installed 2 ton heat pump during summer...
In my house (dual fuel system), the outdoor temperature sensor cuts out heat pump operation at 35*F and lower. It is necessary for the proper functioning of the equipment.
when I was comparing identical houses, I should have said that the windows in the second house faced West.
Crawl space walls are poured concrete and are insulated with R12 bat insulation.No vapour barrier on walls.
Initially I painted the crawlspace floor with latex concrete paint. Painting did not...
I had a similar problem.
My crawl space floor is covered with very rough poor quality concrete. I covered it with a heavy gauge vapour barrier plastic sheets. Musty smell was reduced very...
There is no such thing as a rule of thumb.
Take two identical houses. One has large windows facing North and the other one has the same windows facing South and gets reflections from a lake. If you...
I live in white Rock, just outside Vancouver. The design temp. for heating for Vancouver is 17*F. My heat pump is a Carrier 38YXA 2 ton unit. with an HSPF of approximately 8.6 and a SEER of up to...
Most of the time, the outside temperature is above freezing.
My heat pump is backed up by a natural gas furnace and the balance point is set at 35*F. Below balance point, furnace does all the...
[QUOTE]Originally posted by virginiajersey
Yes, I added a supply duct and register to the colder room. The room in which we do most of our living, was about 2*F colder than other rooms...
Keep in mind that I'm a homeowner who likes to keep himself informed and not an HVAC professional . My house is heated and cooled by a 2 ton Carrier Performance Series heat pump using a Carrier dual...
You mentioned 11,439 BTU/hr heat gain on the main floor and 6,357 BTU/hr heat gain on the top floor.
Since your bottom floor is shaded and the top floor has heat gain through the attic, I suspect...
The programmable thermostat on my heat pump allows for several setting changes in a day.
Since I'm retired, the temperature setting for the whole day until bed time is constant at 68*F and drops to...
Calculations involve only ordinary arithmetic. The following table may help
[Edited by deme on 05-05-2006 at 11:14 AM]
British Columbia, Canada.
More than 90% of electricity comes from hydroelectric sources.
Basic charge $0.12/day or $3.60 per 30 day month.
Energy charge $0.0605/kwh
How many degree days of heating below the 35*F balance point? Will the 90% + gas furnace pay for itself? 80% eff. furnace good enough?
I made a more accurate assessment of the time saved in high heat only. You save only 4.5 minutes!
See my twice-edited original post.
I too tend to over analyze! It's fun!
I have a Lennox G60DFV downflow 2 stage furnace with a White-Rogers control board.
Stage 1 (Low heat stage) of furnace is 68% of stage 2 high heat. Going to stage 2 right from the start will let...
Too late to edit my original post.
Here is info. on my house for summer and winter 1 month periods.
June 22 to July 23, 2005:
Gas 1.9 GJ
June 24 to July 23, 2005:
electricity 725 kwh.
House location: Surrey, B.C. (suburb of Vancouver B.C.) 1/2 mile North of Blaine Washington.
House built in 1984. Inside sq. ft. 1760. Rancher on 4 ft crawl space.
House Wall insulation R12....
I was faced with the same situation and rather than monkey around with restricting air flows, decided to add a duct run to the "colder" room. Of course I could do that because of easy access to...
CMHC Garbage Bag Airflow Test
1760 sq foot rancher over 4 foot high crawl space. Insulated walls with...
Are both rooms with same exposure, i.e. North, East, etc...
Does house have an attic. Ceiling insulation over both bedrooms the same? any obvious air leaks around windows?
Does airflow from...
The temperature differential of 84*F going from -14*F means that the indoor temperature is 70*F.
Heating requirements vary in a linear manner.
Heating requirements for each degree difference...
I have a Carrier 2 ton 38YXA heat pump with time/temp. defrosting.
The defrost thermostat closes its contact 30*F +or- 3* and opens its contacts at 80*F +or- 5*.
Consequence: lots of unecessary...
It's I who misunderstood!
Long, long duct runs?
My two cents worth: Insulate ducts on long runs to improve air temp. coming out at distant registers?
My ducts are located in a heated, insulated crawlspace and I've...
Retired & living in Vancouver B.C.
During heating season: 6:00am to 10:00pm 68*F. 10:00pm to 6:00am 64*F. Occasionally drop daytime temp. by a couple degrees when leaving house for long time....
Heat pump basics at:
This is what my neighbour did some years ago in his house:
Second floor of the house had open staircase and had no air return.
Hot air rose and kept top floor too hot.
He had a return duct...
All the characteristics of the 38YDB heat pump in Acrobat pdf format are given at:
In a previous post I mentioned that I reduced the balance point setting from 40*F to 35*F for experimentation.
Since then, I calculated the additional saving realized by going to 35*. It amounts...
Never had 80% RH in crawl space.
House located just 1/2 mile North of U.S. border at Blaine Washington (your Pacific Northwest).
Mods are still work in progress. All vents, except the one used by...
Do the simpler stuff first:
Are windows double-glazed? Storm windows help and convert single glazed windows to double-glazed ball park.
How much insulation in ceiling/attic? Can you add some?
I sent you an e-mail by guessing your address.
Covered crawlspace improvements. a lot of info is Do it yourself; a no-no here!
will send info on heatpump in a couple of days.
I had the opportunity to do just that a couple of days ago.
We had foggy weather with 100% relative humidity just above 35*F.
I dropped the balance point temperature from 40*F to 35*F and jacked...