Service Training Flashcards by Handy Bros Academy .

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

All of the above

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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

Clean or replace flame sensor and replace ignitor

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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

Amps in series

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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

Delayed Ignition

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

False

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

True

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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

15 Millivolts DC replace under 12.5 Millivolts

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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

750 Millivolts DC

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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 thermocouple provides the power to hold open the pilot solenoid

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

False

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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

24 Volts

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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

Never, should last equipment lifetime

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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

None of the above

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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

Low temp drop in cooling

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

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

False

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

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

2.5MFD

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

Electronically Commutated Motor

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

True

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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

False

Power surges are not covered under WARRANTY

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

The start winding

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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

True

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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

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

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

True

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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

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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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

High amp draw on the motor

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

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

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

TXV & High Pressure Switch

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

Low pressure switch

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

True

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

Coil cleaning and blower/HX teardown

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

Every 4 years

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

Micro Farads/UF

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

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

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

The motor is bad

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

Toxic acidic refrigerant & oil

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

To maintain pressures and temperatures across the heat exchanger

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

Step Down

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

Both A and B

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

Soft Iron

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

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

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

Check - Flow Piston

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

Must be replaced by electrical code

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

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

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

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

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

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

Air bladder, 12 – 15PSI air, and water

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

Copper water line, pex tool, brass pump, insulation, timer relay, bx wire and packouts | Brass pump is key on DHW lines

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

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

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

Firetube

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

False | MoovAir Ductless have Metering device in outdoor unit/

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

35-45 depending on outdoor temperatures

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

The boiling temperature of the medium being measured

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

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

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

36% quieter

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

No | The liquid line is Liquid in both heat/cool operations.

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

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

16,923 | 110,000/6.5 =

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

Canada

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

3 Ohms

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

It does not run

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

Modulating

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

Domestic Hot Water

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

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

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

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

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

False | If absolutely no air can pass through, youll get no temp "rise"

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

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

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

True | You'll have a lower temp rise, but more heat transfer will take place

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

In parallel with the load | The power doesn't go into the Surge Protector, then into the unit.

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

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

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

1000/1

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

1,000,000/1

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

1000/1

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

Start winding

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

1800

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

62.4 Lbs

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

True

Service Training Flashcards

Mid-term mastery