Gas Heat Review

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What are the by product of incomplete combustion

carbon monoxide, aldgehydes, soot

What position should the gas valve be adjust to increase and decrease?

clock wise= off counter clock wise= on

whats the manifold on the assembly for?

supplies the fuel

what is the minmeter for

test Pressure

What is the pilot safe switch for?(module)

to prove there is a flame

What can affect the temperature of gas flame according to the module?

type of fuel and amount of premix air

what position on the gas manual determine if the valve is close or open

when the valve line up with the pipe= open when the valve is crossed= close

What can cause lifting flame?

- Any gas-air change which increases burning speed -Increasing primary air

Why gas have a smell?

Add a odor to be detectable

What can affect flame sustainability on a combustion burner?

Lack of air and restriction

What are the 3 type of field gas use on gas furnace according to the module

Propane Methane Butane

Define stand pilot(module)

The main burner required the pilot(stay lit all time)

What is the typical LP manifold pressure

10.5 to 11 in W.C

How do you determine a good thermal couple on a close check?

15 mv

How much W.C per 1 IB of gas?

27.68

What is the typical natural gas manifold pressure

3.5 in W.C

How do you determine a good thermal couple on a open check?

30 mv

2 IB of gas coming into a build, how much of water is coming?

55.36 W.C

Whats the typical gas pressure coming to a build on low pressure?

7 inch W.C

What does 100% shut off on combination gas valve mean?

All of the gas on both the pilot and the main burner is automatically shut off if the pilot goes out.

Define redundant automatic gas valve?

An automatic gas valve that employs two or more valves in series, so that if one should fail to close properly, the closure of the other(s) would insure that the flow of gas is stopped. a safety requirement

What color should the flame look like?

Blue

Define Primary air

Combustion air that is mixed with gas in a Bunsen-type burner before leaving the port

Define secondary air

Combustion air that mixes with the burning gas-primary air mixture in the flame zone

Define Stoichiometric combustion?

Combustion in which the amount of combustion air supplied exactly matches the amount needed for complex oxidation of all the gas; combustion with no excess air

What can cause a flash back on gas burner

Fast burning gas primary air increase gas pressure is low

what is necessary for combustion to happen?

Fuel, air, and ignition

what can cause yellow tipping?

Lacking of primacy air supplied.

what happen if we have contamination with combustion air with chlorine compound?

Produce Hydrochloric acid, hydrofluoric acid, chlorine gas and Phosgene

Purpose of high limit

Protect heat exchanger + equipment from excessive heat + shut off the gas to prevent a fire

Define Specific Gravity(field gas)

The energy of molecular motion; measured with a thermometer;associated with a change in temperature.

Define inres (module) Pilot burner

The one has primary air thats feed in the side

Definition of flammability limits

When fuel gas and air is supplied at proper rate to assure complete of gas combustion

What can cause incomplete combustion?

lack of oxygen and impingement

What cause a flowing flame?

lack of secondary air

Purpose of gas orifice

meter the correct amount of gas into each burner

What Kind of gas burner are used on residential

mono port + multi port burner

What happen to the nitrogen in combustion process?

nitrogen then carbon dioxide then carbon monoxide


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