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Foam core is also known as open cell which has small air pockets as opposed to closed cell which is solid. When used for venting you must use closed cell or solid PVC. If the rating on the pipe is...

Purge the system, blead any air vents in the system on the baseboards and verify the water pressure on the boiler gage is at 12 - 18 psi if the home is not more than two stories.

See figure 4
This works best if akl heating zones are the same water temperature
http://www.comfort-calc.net/primary-secondary_piping_tutorial.html

See figure four. This works well when all zones are the sdame temperature.
http://www.comfort-calc.net/primary-secondary_piping_tutorial.html

Is the compressor running? If so sounds like it might be a bad compressor.

The boiler should be cold start with an indirect and the high limit on the boiler should be 180. Maintaining temp on the boiler is a huge waste of fuel.

I have never heard such crap. You will not block up a cast iron boiler with crud. If it worked before you changes the pump it should work OK. I think it may be the valve issue KC13 stated or air in...

If it is gas the answer is no. For every 100,000 btu's burnered you create 1 gallon of water. Hopefully all goes up the chimney. If spillage occurs the moisture will be on the inside of the home. Get...

The installation instructions on steam boilers discuss the boilers need to be skimmed. This gets the oil from the top of the water. For more info see the attached link, click steam menu and see FAQ...

For more info on sizing a/c look at the attached link
Technical Menu under heat loss. The same ideas apply as sizing heating equipment.

I personally have not but know company's that use quite a few. They only had good things to say. They really like the reader with the wire lead instead of the clamp on reader.

Millivolt contacts are usually silver coated due to very low voltage. I don't know if anybody makes a spst relay for millivolt.

I would think the manufacturer would not want any elbows on the vent when vented vertically. Check the manual or with the contractor.

Yes, depending on the size of the breaker. 10 may be overdoing it.
Add up all the watts and divide by voltage. Usually 240v. You must be at least I believe it is 10% under that rating.
If you have...

You will need to supply the furnace model number and manufacturer. The burner number does not tell us as the nozzle is particular to the applied appliance.

The typical CO2 is between 11 and 12.5. Draft on negative draft appliances should be -0.02 over fire. The stack will vary greatly per unit.
Excess air is normally around 25%

When try to adjust at the registers it may get noisy.

The millivolt systems have been discontinued due to minimum government standards or maybe I should say government control.

You need to supply manufacturers names and model numbers

One word "air". You have air in your system which makes the system sound like a babbling brook. This is usually caused by low pressure or improper air elimination.

If there is no resistance I think you have a bad fill valve and the Gage does not work. There is no resistance when the pressure is real low but when it starts to get close it will encounter...

There should be gauge to watch so the refill pressure does not go above 12 psi. To check the air charge in the tank you need to have "0" water pressure in the tank. If the charge is low you can use...

It is normally connected to the air separator and therefore mounted on the supply with the circulator pumping away from the point where the expansion tank connects into the system.

Step number one is a manual J heat loss. Proper sizing is the most important step that is normally overlooked during the sales process. Oversizing will reduce the efficiency, increase maintenance and...

You can do anything if you have the money. What type of system do you have? Baseboard electric, electric boiler, electric furnace, etc?

With an indirect water heater on a boiler that is not a really large old boiler you should not be maintaining any water temperature. It would not make sense to spend the money on an indirect and...

HVAC equipment needs to be properly sized by using a manual J calculation. On other sights they are talking about rate increases on electric and gas. As prices continue to climb the need for proper...

1200 sq ft? Have him check the size with a heat gain calculation. This is a science not multiple choice. The decision you make now you will live with for the next 15 years. Proper sizing is key to...

You are sure it is an airflow problem? How. What about a charge problem?

3 ton for a 1200 sq ft home. Sounds like someone over sized the a/c coil if that is the size they installed. Want to bet the furnace is also too big.

As stated by KeepItSimpleStupid check or have checked the static. Here is a link on how to do that. You will need to borrow a manometer.
Checking Static Pressure on a Duct System

I hear many people call the ignition module a modulator. The only way that could cause this is if the thermostat heat anticipator does not match the new control. If he meant something else something...

It is not uncommon for a return air system not be ducted. Many system will use what the call panning a floor joist or wall space for return air. All the supplies should have ducts all the way.
Use...