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HBA Service Excellence Bootcamp > Service Training > Flashcards

Service Training Flashcards

Mid-term mastery

1
Q

Which of the following are sign(s) of dirty burners?
* 118 PPM CO
* Impingement
* Orange/Yellow flames
* All of the above

A

All of the above

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2
Q

Using your combustion analyzer you find bad burners during maintenance. In addition to burner teardown, what additionally would you offer to ensure no future breakdowns?
* Clean or replace flame sensor and replace Ignitor
* Flush and clear drain system
* HB Family Tune Up
* Blower Assembly Teardown Level 1

A

Clean or replace flame sensor and replace ignitor

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3
Q

Using a multimeter how could you test an ignitor for weakness?
* Micro Amps in parellel
* Amps in series
* Volts DC in series
* Amps in parallel

A

Amps in series

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4
Q

If an ignitor is slowly building resistance which of the following could occur?
* Hi limit tripping
* The circuit board could fail
* The ignitor could overheat
* Delayed ignition

A

Delayed Ignition

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5
Q

True or False - Manufacturers recommend an ignitor and flame sensor to be replaced every 4 years.
* True
* False

A

False

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6
Q

True or False – The flame rectification sensor is located opposite the ignitor in order to prove cross burner ignition.
* True
* False

A

True

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7
Q

When testing a closed-circuit thermocouple, what is a good reading on your multimeter?
* 30 Millivolts DC replace under 25 Millivolts
* 20 Millivolts DC replace under 15 Millivolts
* 25 Millivolts AC replace under 20 Millivolts
* 15 Millivolts DC replace under 12.5 Millivolts

A

15 Millivolts DC replace under 12.5 Millivolts

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8
Q

When testing a open-circuit thermopile, what is a good reading on your multimeter?
350 Volts AC
750 Millivolts DC
750 Millivolts AC
350 Millivolts HP

A

750 Millivolts DC

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9
Q

How does a fireplace pilot open without 120V power being provided to it?
* The thermocouple pushes the valve spring through the copper conduit
*A thermocouple provides the power to hold open the pilot solenoid
* A thermopile provides the power required to hold open the pilot solenoid
* Fireplaces have special gas valves that only need 24V to open and uses a standing pilot

A

A thermocouple provides the power to hold open the pilot solenoid

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10
Q

True or False – On a Modulating Furnace you do not need to set the high stage gas pressure.
* True
* False

A

False

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11
Q

What voltage would you read across a seized gas valve when the control board GV relay is closed?
* 0 Volts
* 24 Volts
* 120 Volts
* 24 Millivolts

A

24 Volts

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12
Q

How often do manufacturers recommend a gas valve be replaced?
* When the gas valve clicks
* When there is zero potential difference with the GV relay closed
* Every 8 Years
* Never, should last equipment lifetime

A

Never, should last equipment lifetime

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13
Q

A dirty blower wheel can cause which of the following to occur?
* Low amp draw
* Low temp drop in cooling
* Low temp rise in heating
* None of the above

A

None of the above

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14
Q

A dirty evaporator can cause which of the following to occur?
* Low amp draw
* Low temp drop in cooling
* Low temp rise in heating
* None of the above

A

Low temp drop in cooling

A dirty Evap will have poor heat transfer to the surrounding air!

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15
Q

True or False – A PSC motor will draw less amps than an ECM for the same HP when the ductwork is blocked?
* True
* False

A

False

Increased static, less airflow on blower, less weight of air on blower

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16
Q

The value of two 5MFD capacitors connected in series is?
* 5MFD
* 2.5MFD
* 20MFD
* 10MFD

A

2.5MFD

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17
Q

What does ECM stand for?
* Electronically Commutated Motor
* Electronically Commutated Movement
* Electronic Communicated Magnet
* Electrically Commutated Motor

A

Electronically Commutated Motor

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18
Q

True or False – A ECM has a microprocessor that calculates the motors speed and torque?
* True
* False

A

True

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19
Q

True or False – A power surge during operation will take out an ECM and should be replaced under warranty with an ECM protector to prevent further equipment failures.
* True
* False

A

False

Power surges are not covered under WARRANTY

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20
Q

On a PSC motor a run Capacitor is connected to?
* The start winding
* The run winding
* The common winding
* None of the above

A

The start winding

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21
Q

True or False – A limit safety switch is designed to fail open and must be replaced if it activates (opens) lower than required temperature.
* True
* False

A

True

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22
Q
  • Upon conducting a combustion analysis, the flue gas is reading CO at 300 PPM what should you do?
  • 300 PPM is within acceptable limits
  • 300 PPM is within acceptable limits however it is concerning and should be “B Tagged”
  • 300 PPM is over acceptable limits and should be “A Tagged” if customer does not do repairs today
  • 300 PPM is over acceptable limits and should be “B Tagged” with recommended repairs
A

300 PPM is over acceptable limits and should be “A Tagged” if customer does not do repairs today

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23
Q

Flue gasses condense at 135F making power vent water heaters 30% less efficient.
* True
* False

A

True

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24
Q

What is the purpose of a combustion motor?
* Pulls fresh air from the outdoors to the burners to ensure complete combustion
* Keeps the Heat exchanger cool to prevent over heating
* Exhaust the products of combustion from the Heat exchanger to the outdoors
* Induces a negative pressure across the heat exchanger and exhausts flue gasses to a safe place outdoors

A

Exhaust the products of combustion from the Heat exchanger to the outdoors

Combustion motors create a positive pressure across the heat exchanger.

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25
Q

How do we absolutely know an inducer motor is wearing out?
* High amp draw on the motor
* Low amp draw on the motor
* Pressure switch manometer readings are not strong enough to close pressure Switch
* None of the above

A

High amp draw on the motor

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26
Q

Pressure switches are in the system for what purpose?
* To monitor the pressures and close contacts when the pressures are wrong
* Ensure all products of combustion are unobstructed and exhausted to the outdoors
* Control the pressure flowing within the equipment
* Non of the Above

A

Ensure all products of combustion are unobstructed and exhausted to the outdoors

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27
Q

What will attempt to protect a compressor in an overcharged situation?
* High Pressure Switch
* TXV
* Turn up the blower CFM
* TXV & High Pressure Switch

A

TXV & High Pressure Switch

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28
Q

Excluding abnormally high return temperatures - Which of the following will prevent compressor burnout in the event of high superheat?
* TX Valve
* Receiver
* Accumulator
* Low Pressure Switch

A

Low pressure switch

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29
Q

True or False – The dew point temperature increases with air temperature if relative humidity remains constant.
* True
* False

A

True

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30
Q

While inspecting an evaporator coil you determine the coil is moldy,dirty and restricted, what two things should you quote?
* Coil cleaning and blower/Hx teardown
* Coil cleaning and capacitor
* Coil cleaning and UV light
* New coil and 5 inch filter cabinet

A

Coil cleaning and blower/HX teardown

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31
Q

How often does the manufacturer recommend disinfecting and cleaning an evaporator coil?
* Annually
* Every 4 years
* Every 5 Years
* Only when we notice it is moldy or restricted

A

Every 4 years

32
Q

What is the unit of measurement used for testing weakness in a capacitor?
* Volts/E
* Amps/I
* Micro Farads/UF
* Micro Farads/UA

A

Micro Farads/UF

33
Q

True or False – An AC compressor is designed to take a low pressure, low volume vapour and turn it into a high-pressure high-volume vapour.
* True
* False

A

False

Turns a Low Press, Low Temp, Vap. into a High Press, High Temp, Vap

34
Q

While testing a PSC winding you get the following readings - “OL” between R – C and 2.0 S – C, you are a professional and don’t test any further.
* The motor is good
* The motor is bad
* The internal overload is tripped
* None of the Above

A

The motor is bad

35
Q

If a compressor is receiving high super heat the system can become compromised and run the risk of creating what?
* Toxic alkaline refrigerant and oil
* Toxic acidic refrigerant & oil
* Toxic flammable resins
* Radioactive toxic refrigerant

A

Toxic acidic refrigerant & oil

36
Q

During Heating, what is the purpose of the condenser fan motor in a heat pump?
* To move the proper CFM through the outdoor condenser coil maintaining design head pressures and temperatures
* To lower the head pressure as temperatures rise
* To protect the compressor from overheating
* To maintain pressures and temperatures across the heat exchanger

A

To maintain pressures and temperatures across the heat exchanger

37
Q

If a Transformer has less windings on the secondary side what type of transformer is it?
* Step Up
* Step Down
* Isolation
* None of the above

A

Step Down

38
Q

Transformers work off which of the following?
* Alternating current only
* Direct current with an active 60 cycle per second switch
* Alternating current and direct current
* Both A and B

A

Both A and B

39
Q

What is the core of a transformer made of?
Tempered Copper
Hardened Steel
Soft Iron
Soft Lead

A

Soft Iron

40
Q

A TXV does which of the following?
* Maintains a constant superheat under all conditions
* Maintains a half full evaporator coil
* Maintains an almost, fully saturated evaporator coil without damage to the compressor
* Non of the following

A

Maintains an almost, fully saturated evaporator coil without damage to the compressor

41
Q

Which of the following might a refrigeration system have if there is no TXV?
* Check - Flow Piston
* Back - Check Piston
* Slam - Check Piston
* All Evaporator coils must have a TXV by code to maintain 13 SEER mandate

A

Check - Flow Piston

42
Q

If a disconnect is sticking or hard to remove what must be done by Electrical Code?
* Spray Disconnect connections with WD40
* Open disconnect connections for easier use
* Must be replaced by electrical code
* Clean and polish disconnect connections

A

Must be replaced by electrical code

43
Q

On a deactivated disconnect using a multimeter across your terminals what should your voltage reading be?
A. 240V Load - Load
B. 120V Line - Line
C. 240V Line - Load
D. 120V Line - Load

A
44
Q

Before testing a pressure relief valve what should you do?
* Turn the water main off to hydro-lock the unit
* Open the sediment valve to remove pressure
* Inform the customer that the pressure relief valve may fail and will need to be replaced
* We are not required by code to test pressure relief valves

A

Inform the customer that the pressure relief valve may fail and will need to be replaced

45
Q

Where should the expansion tank be located on a water heater?
* On the cold water inlet upstream from all check valves
* On the cold water inlet downstream from the water meter after all check valves
* A water tank shouldn’t need a expansion tank
* On the hot water to provide expansion as the temperature rises

A

On the cold water inlet downstream from the water meter after all check valves

46
Q

Which of the following is part of a boiler expansion tank construction?
* Air bellows, 25 – 30 PSI air, and water
* Air bladder, 12 – 15PSI air, and water
* Diaphragm, 60 - 65PSI, and water
* All of the above

A

Air bladder, 12 – 15PSI air, and water

47
Q

Which components could you successfully install a recirc line with?
* Pex water line, pex tool, insulation, circ pump, bx wire, timer relay, and packouts
* Copper water line, pex tool, brass pump, insulation, timer relay, bx wire and packouts
* Pex water line, pex tool, bx wire, packouts, and circ pump, thermostat
* Copper water line, pex tool, circ pump, insulation, timer relay, bx wire, and packouts

A

Copper water line, pex tool, brass pump, insulation, timer relay, bx wire and packouts

Brass pump is key on DHW lines

48
Q

True or False – Lowering blower CFM raises superheat and is a burnout risk for compressor.
* True
* False

A

False

Youd be adding less heat energy to the system, as less heat over HX

49
Q

What type of Heat Exchanger does the IBC Boiler have?
* Open Flame
* Fire Ring
* Firetube
* Super Jet

A

Firetube

50
Q

True or False – MoovAir ductless units have one TXV located indoors.
* True
* False

A

False

MoovAir Ductless have Metering device in outdoor unit/

51
Q

What is the Optimum Humidity Zone for a home?
* 20-50 year round
* 35-45 depending on outdoor temperatures
* 35- 50 year round
* We want 45% exactly to avoid all comfort issues

A

35-45 depending on outdoor temperatures

52
Q

What is SST?
* The temperature of latent heat
* The boiling temperature of the medium being measured
* The freezing temperature of the medium being measured
* None of the above

A

The boiling temperature of the medium being measured

53
Q

True or False – An efficient evaporator will only be saturated right in the middle of the coil.
* True
* False

A

False

It will be almost FULLY SATURATED all the way to the end of the coil

54
Q

How much quieter is a side discharge heat pump vs a traditional heat pump?
* They are the same
* Traditional units are quieter then side discharge
* 36% quieter
* 85% quieter

A

36% quieter

55
Q

When installing a HMH do you need to insulate the liquid line?
* Yes
* No

A

No

The liquid line is Liquid in both heat/cool operations.

56
Q

How many Zones can a VX Boiler support without an additional zone board?
* 2
* 3
* 4
* 5

A

4

57
Q

If a VX Boiler is 110,000 BTU/Hr with a 6.5:1 turn down rate. What is the lowest BTU/Hr it can run?
* 12,510 BTU/Hr
* 16,923 BTU/Hr
* 14,587 BTU/Hr
* 65,034 BTU/Hr

A

16,923

110,000/6.5 =

58
Q

Where are IBC Boilers Engineered and Assembled?
U.S.A.
China
Mexico
Canada

A

Canada

59
Q

True or False – When reading a motor winding you get the following with your instruments: 18 ohms common to start, 21 ohms start to run. What should the common to run be?
3 ohms
18 ohms
OL ohms
39 ohms

A

3 Ohms

60
Q

When a heat pump is in its defrost cycle what does the condenser fan do?
* It runs full speed
* It does not run
* It runs slowly
* None of the above

A

It does not run

61
Q

What type of Furnace is a YP9C?
* 1 Stage
* 2 Stage
* Modulating
* Heat Pump

A

Modulating

62
Q

In a Combination Boiler system which will take priority?
* Domestic Hot Water
* Space Heating
* In-floor heating
* Snow melt system

A

Domestic Hot Water

63
Q

True or False – An AC refrigerant restriction will cause the following readings on your instruments: High subcooling, high head pressure – low superheat, low pressure.
* True
* False

A

False

High subcool, High Headpressure and High Superheat, Low Suction Pressure

64
Q

True or False – A air restriction will cause the following readings on your instruments: Normal subcooling, normal head pressure – low superheat, low pressure.
* True
* False

A

True

Air restriction wont allow enough heat to move over HX cause the low SH

65
Q
  1. True or False – A completely plugged secondary heat exchanger will cause a low temp rise.
    A. True
    B. False
A

False

If absolutely no air can pass through, youll get no temp “rise”

66
Q

True or False – In heating: The slower the air passes through a heat exchanger the more the air will pick up heat.
True
False

A

True

You’ll have a higher temp rise, but less heat transfering into the coil.

67
Q

True or False – In heating: The faster the air passes through a heat exchanger the more heat it will transfer.
* True
* False

A

True

You’ll have a lower temp rise, but more heat transfer will take place

68
Q

How is a surge protector installed?
* In parallel with the load
* In series with the load
* In series with the breaker
* None of the above

A

In parallel with the load

The power doesn’t go into the Surge Protector, then into the unit.

69
Q

True or False – Refrigerant can get stuck as either a liquid or a vapour and do irreparable damage if we can’t completely change state back and forth in an AC refrigeration system.
* True
* False

A

True

ex. Txv fully stuck open not metering the refrigerant properly.

70
Q

How many milliamps are there in one ampere?
* 100/1
* 1000/1
* 1,000,000/1
* None of the above

A

1000/1

71
Q

How many microamps are there in one ampere?
* 100/1
* 1000/1
* 1,000,000/1
* None of the above

A

1,000,000/1

72
Q

How many millivolts are there in one volt?
* 100/1
* 1000/1
* 1,000,000/1
* None of the above

A

1000/1

73
Q

The holding coil of a SPP5 potential relay is connected to the?
* Start winding
* Run winding
* Common winding
* Does not have a holding coil

A

Start winding

74
Q

At what point will a copper turn red?
* 1000
* 1250
* 1800
* 2800

A

1800

75
Q

*

What is the weight of one cubic foot of water?
* 64.2 Lbs
* 64.9 Lbs
* 62.4 Lbs
* 62.9 Lbs

A

62.4 Lbs

76
Q

True or False – Heat of compression adds heat over and above heat removed from the home.
* True
* False

A

True

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