Service Training Flashcards
Mid-term mastery
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
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
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
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
True or False - Manufacturers recommend an ignitor and flame sensor to be replaced every 4 years.
* True
* False
False
True or False – The flame rectification sensor is located opposite the ignitor in order to prove cross burner ignition.
* True
* False
True
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
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
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
True or False – On a Modulating Furnace you do not need to set the high stage gas pressure.
* True
* False
False
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
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
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
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!
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
The value of two 5MFD capacitors connected in series is?
* 5MFD
* 2.5MFD
* 20MFD
* 10MFD
2.5MFD
What does ECM stand for?
* Electronically Commutated Motor
* Electronically Commutated Movement
* Electronic Communicated Magnet
* Electrically Commutated Motor
Electronically Commutated Motor
True or False – A ECM has a microprocessor that calculates the motors speed and torque?
* True
* False
True
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
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
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
- 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
Flue gasses condense at 135F making power vent water heaters 30% less efficient.
* True
* False
True
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.
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
4
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
- 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
