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HVAC TZ Test 2 > HVAC > Flashcards

HVAC Flashcards

1
Q

What do you call the line that traps moisture and dirt in the gas line (natural gas line)?

A

Drip leg

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2
Q

What air is used for ignition? furnace.

A

Primary air

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3
Q

What air is used to support the primary air?

A

Second air

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4
Q

What kind of pressure that the induced motor maintain?

A

Negative Pressure

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5
Q

A flame that is bright blue inner surrounded lighter blue outer is known as?

A

No unburned carbons

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6
Q

A typical furnace is equipped with a burner, a combustion blower to move combustion gas. True or False?

A

True

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7
Q

What tool do you use to check and set the gas pressure?

A

manometer

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8
Q

If the flam tip is yellow, what does that mean?

A

insufficient primary air

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9
Q

What is the by-product of incomplete combustion? If not burning properly.

A

Carbon monoxide

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10
Q

A high-efficiency condensing furnace uses PVC Vent piping. What category?

A

category 4

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11
Q

What is the purpose of the thermocouple?

A

To maintain the pilot light for safety.

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12
Q

What is the purpose of the flame sensor?

A

Senor the flame

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13
Q

What current does the thermocouple produce when heated?

A

DC

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14
Q

Is it safe that a standing pilot or hot surface ignitor are used for ignition source on a furnace. T or F?

A

True.

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15
Q

Can a technician jump a limit switch?

A

Yes. the purpose of testing only.

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16
Q

The combustion blower/ induced draft is designed to bring in combustion air. The indoor blower is designed to push conditioned air. True or False?

A

True

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17
Q

What is one of the main causes of the flame sensor failure?

A

Dirty or corroded

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18
Q

What are the 6 steps of the firing sequence of the furnace?

A

1) Inducer motor/combustion blower
2) Pressure Switch
3) Ignitor
4) Gas valve
5) flame sensor
6) indoor blower

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19
Q

What is the proper gas setting for natural gas?

A

3.5 inches of WC (water column).

20
Q

What is the proper gas setting for propane?

A

10.5 inches of WC (water column).

21
Q

Will the ignitor stay energized for relighting if the flame sensor does not protect the flame?

A

No. no relighting. has to start over the sequence.

22
Q

What category is 80% non-condensing mini-efficiency furnace that uses V vent pipe?

A

category 1. 4 is for high efficiency

23
Q

T or F. when a technician is brazing his line set, should he run nitrogen through it?

A

True

24
Q

We should always calibrate our gauges to what on our manifolds?

A

Zero atmospheric pressure 14.7psi

25
Q

Should a technician always have a fire extinguisher at the job site when brazing?

A

Yes

26
Q

Can you release 410A into the atmosphere over R22?

A

No. It is illegal. can’t release any refrigerant into the atmosphere.

27
Q

By using methods by charging by superheat and subcool protect the compressor?

A

yes.

28
Q

What kind of acid for we produce we combine refrigerant, oil, and heat?

A

Hydrofluoric and Hydrochloric

29
Q

If you get to a system and you put your manifolds on and it reads zero PSIg what does that mean?

A

Means it is empty. Can not recover anything.

30
Q

Is Nitrogen safe to release to the atmosphere?

A

yes

31
Q

Do you need a regulator when you are dealing with any gas?

A

Yes

32
Q

What is the one thing we always install in our liquid line? new or repairing a system

A

liquid line dryer

33
Q

If the fan motor fails to operate. Will that increases or decrease the head pressure?

A

Increase

34
Q

What do we use to measure Ohms with?

A

Ohm’s meter

35
Q

whenever we recover refrigerant to a bottle (yellow and gray). What percentage do we go?

A

80% of the bottles W.C. (water capacity)

36
Q

What do we use a vacuum pump for?

A

Vacuum the compressor

37
Q

What do you use a recovery for?

A

To recover refrigerant

38
Q

What do you use to cut tubing with?

A

Tubing Cutter. circular saw

39
Q

Sometimes you have to cut the side out of the furnace for up flow. How do you cut it out?

A

Take a skilled saw and flip the blade backward

40
Q

What is the purpose of a high-pressure switch?

A

Protect high-pressure.

41
Q

The center port of the manifold is used to do what?

A

charging, recovering, evacuating

42
Q

What kind of gauge is used

A

compound gauge

43
Q

Once the compressor is pulled down to its proper vacuum what do you do next?

A

valve off your manifolds

44
Q

What is a proper vacuum level

A

500 microns or less

45
Q

How do you adjust superheat?

A

By adding or removing refrigerant.

46
Q

Can you retrofit 410A to R22 by changing the metering device?

A

False

HVAC TZ Test 2 (1 decks)

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