(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.
3
votes
2answers
324 views
Why does the pilot light go out when the furnace is running?
Every time the furnace fires up, it blows out the pilot light. Sometimes it will run a full cycle and blow out when it shuts down, and sometimes it will blow out about a minute into the cycle.
We ...
1
vote
2answers
20 views
How to find areas where heat/coolness are lost?
I live in a 2-story rental townhome (basically an apartment with 2 stories). Our central air/heat system isn't really the best at keeping the upstairs and downstairs the same temperature whether in ...
1
vote
2answers
59 views
Should I insulate air conditioner coolant pipes?
I recently replaced some rotted insulation on the coolant pipe that runs out of my AC unit and into the evaporator in my house. When cleaning inside the actual AC unit itself I noticed that the ...
0
votes
2answers
111 views
What could be causing this leaky evaporator problem?
My apologizes if I do not know the correct terminology for some of the parts. I will try my best though.
We have a Trane A/C system that is causing us a headache. It is causing water damage in our ...
2
votes
1answer
55 views
How do we replace an old 3-wire thermostat with a 4-wire one?
How do we replace an old 3 wire thermostat with a 4 wire one? We have an AC/heating unit, but the wiring for the thermostat does not have a yellow wire.
What can we do?
1
vote
1answer
500 views
How to connect Nest in Europe
I found a question regarding the Nest thermostat here. But that is only a question "Will it work?". Thanks to that I know it WILL, the problem is...HOW. I know the wire naming conventions are ...
0
votes
1answer
52 views
How effective is a heat pump for AC and a heat pump/furnace for heating in New England?
We currently have a central AC unit and oil furnace. The AC is broken and the furnace is old, so we are thinking of replacing both sometime in the next year.
We are considering replacing the AC with ...
3
votes
0answers
43 views
Why won't the fan run independently of the air conditioner?
I have central air and heat, with a Nest thermostat. My system has Y, G, R, C and W wires coming out of it:
which are wired into my Nest like so:
In between, there is a splice where the C wire is ...
2
votes
0answers
65 views
Does each zone in a two-zone heating system have its own pilot light?
I have two zone heating, in the basement and upstairs where we really live. The pilot light is lit downstairs, but the heat isn't working upstairs (the air is not getting hot). Is there also a pilot ...
2
votes
0answers
31 views
Should I install the jumper on my new limit control?
I needed to replace fan and limit control (White-Rodgers, model 5D51-35), because the fan switch was broken (fan would constantly run) and heat would not stay on.
I took a picture of the control, ...
1
vote
0answers
60 views
How do I size a wall sleeve for a through-the-wall air conditioner?
We are shopping for a through-the-wall air conditioner. We do not currently have a hole in the wall with a sleeve in it. We are trying to figure out what sleeve to buy.
The air conditioner we like ...
1
vote
0answers
151 views
What's causing my draft inducer to stay on?
I have a new, 3-year old, high-efficiency, gas furnace in my home. I recently realized that my draft inducer, which normally kicks on before the burners and before the main blower, is not stopping.
...
1
vote
0answers
333 views
How can I properly drain heatpump condensate?
I have a heat pump in the attic That drains to the ground outside two floors below. I naively added a hose fitting so I could redirect the water where I wanted it, slightly up hill.
This created a ...
1
vote
0answers
280 views
What are good Relative Humidity and Temperature settings on an MHRV and are the settings related?
I need to configure the threshold Relative Humidity and Temperature settings on an whole house MHRV system.
The way the system works is that if the RH threshold is exceeded the system increases the ...
0
votes
0answers
89 views
Why isn't water running through our radiators?
We had a plumber in today to bleed our rads. He also changed the batteries on the thermostat and fiddled around with the boiler. Since he left the temperature has dropped dramatically and he's refused ...
0
votes
0answers
55 views
What does the low limit do, and where should it be set on an oil fired hot water furnace?
What does the low limit do, and where should it be set? My furnace has
a honeywell triple aquastat relay and has a difference dial. Water temp is about 190 deg F. Also, water psi gauge is only ...
0
votes
0answers
130 views
How can I stop cold air from coming through my basement air return?
there is cold air coming in from my basement air return when the heat is not running , my HVAC unit located outside any suggestions on how to stop the airflow?
0
votes
0answers
82 views
I have no furnace, only electric blowing heaters. How do I get ventilation?
I have a 100 years old building with a store on the main floor. Since the building was built over 100 years old there is no ducting whatsoever. There is also no furnace. In the summer we just hook ...
0
votes
0answers
217 views
new furnace installed - few questions
So, Sunday the fan on our 18 year old furnace died; instead of paying the $600 to get it repaired, i opted to buy a new one.
Lennox SPV98UV (i think) 98% efficient / variable speed fan. they ...
