CLICK HERE 2022 Carrier/Bryant Ductless Systems Self-Study Quiz

Technical info can be found where?

CE App
Internet
CEMA training website (CEMAtraining.com)
Carrier Service Tech app
All of the above

When wiring a system, you need to

Use 14/4 solid wire
Use 14/4 stranded wire
BX Cable
Use brown low voltage wire

How should a condensate float switch be wired in?

Breaking L1
Breaking L2
Breaking the S-wire
On the 24v transformer

Place these in the correct order of sequence

Purging nitrogen 1-2 psig
500 Micron vacuum
Nitrogen pressure test
Brazing

View Answers:

What benefits do we get from using nitrogen during a refrigeration repair?

No oxidation
A quicker Vacuum is achieved
A more reliable system
All of the above

You should pressure test a system with nitrogen above the systems normal operating pressures?

True
False

To get into the setup menu of the indoor units you need to?

Press and hold the power button on the remote
Press and hold the Mode and Fan/Timer on button for 3 seconds
Cycle the power to the unit and remote for 3-5 mins
B & C
A & C

On ducted indoor units you need to setup your static pressure by using dip switches or the controller?

True
False

All indoor units need to be in the same mode of operation to work correctly?

True
False

When on a service call you should?

Check the temperature split
Make sure the unit is clean
Check the condensate line drain
All of the above

When checking fault codes, the indoor unit and outdoor unit will show the same error code designation all the time?

True
False

When troubleshooting a communication code, you should

Check the refrigerant pressures
Change the filter
Disconnect the S-wire and check for induced voltage to ground
Cycle power and hope it starts again

A E1 code only means a loss of communication?

True
False

When checking the Communication L2 -S, the DC voltage should be_________ when working correctly?

Stable
Fluctuating Positive
Fluctuating Negative
Alternating Positive and Negative

When checking a thermistor, you should?

Disconnect power, unplug the sensor and use continuity on your meter to check
Leave the power on and check ohm readings while the sensor is plugged in
Disconnect power, unplug the sensor and use ohms on your meter to check
Leave the power on and check the amp draw readings while the sensor is plugged in

When ohming a compressor the compressor should have __________________ windings?

A equal resistance between each winding
A different resistance between each winding

Do ductless systems need cleaning?

True
False

Ductless systems achieve a SEER up to?

19
26
34
42

A ductless outdoor must be connected to a ductless indoor only?

True
False

You can connect a ductless outdoor to a gas furnace and standard evaporator coil.

True
False

A proper heat load is?

not required since the system is variable capacity.
not required since the compressor is variable speed.
required due to minimum capacity and minimum run times.
equal to 400 square feet per ton.

System size is determined by?

Cooling load calculation.
Heating load calculation
the smallest load
the largest load.

The 38MARB series maintain 100% heat capacity to?

40°
5°
32°
0°

Ductless system meter refrigerant at the___________?

Indoor Unit
outdoor unit
No metering device is used on ductless applications
both outdoor and indoor units
outdoor except the 38MURA series
Ductless systems utilize a turbo encabulator in lieu of a metering device

Ductless systems operate in?

Fahrenheit temperature.
Celsius temperature.
A dimension somewhere between space and time. A place called the twilight zone.

Heating compensation is used to calibrate return sensor to___________.

increase comfort.
reduce overshooting temperature.
reduce under heating.
All of the above.

No matter where you read the current fault code (indoor, outdoor or wall control) the fault code will always be the same?

True
False

The most common fault on start up is ________________

low charge.
over charge
compressor failed.
communication fault.

Standard wiring between the indoor and the outdoor is ________.

18 gauge thermostat wire
14/3 with ground solid wire
14/3 with ground stranded wire
16/3 shielded wire
it does't matter as long as it is good

If there is high electromagnetic interference (EMF) causing communication issues you should

replace the indoor board.
install 14/2 shielded wire on 2(L2) and 3(S).
replace outdoor board
replace outdoor unit
replace indoor unit.

If you need to splice the communication wires you may

solder the wires
use wire nuts
use butt connectors
not splice

Communication is carried on which wires?

S (3)
S(3) & ground
L1 (1) and S (3)
L2 (2) and S (3)

An external drain safety should break?

S (3)
L1 (1)
L2 (2)
Internal shut down terminals

Communication voltage is?

about 24 VAC
about 50 VDC positive
alternating between about +50 to -50 VDC.
about 50 VDC negative.

Induced current on the S (3) wire is due to?

bare spots in the insultation of the wire.
magnetic field induced to wire if it is twisted around the power wire.
incoming voltage above 250 volts.
failed reactor.
Solar flares

Which indoor units have a display board?

All of them.
High wall and cassette
Cassette and console.
Console and ducted.
High wall and ducted.

Ductless outdoor units have

1 board
2 boards
3 boards
up to 3 boards

Some fault codes may be indicated by flashing LED’s on the indoor or outdoor boards?

True
False

Static pressure can be set on the _____________

Cassette unit.
ducted unit.
console unit.
high wall unit.
1 & 3
2 & 4

Anti cold air function is to _______________

keep from blowing cold air during heat mode.
shut down unit when blows too cold of air during cooling.
speed up the fan so it does not blow too cold of air.
bring on electric heat during defrost to offset the cold air.

As shipped from the factory, in cool mode the indoor fan in auto selection

shuts off when temperature is satisfied.
runs 90 seconds after temperature is satisfied.
Runs continuous at minimum speed
runs continuous at high speed.

All of the outdoor units have

Display boards.
Diagnostic lights.
Board and lights.
board and/or lights.

On the 24 volt interface a code reading 20 means_______.

the compressor is running at 20 HZ.
system is running at 20% capacity.
board is mounted upside down and system is cool mode.
board is mounted upside down and system is heat mode.

The term ductless system means

there is no duct work.
there may be ductwork but the indoor communicates directly to the outdoor unit.
the out door unit is classified as part of a ductless system but the indoor may be ductless or ducted.
Is getting more confusing as more products are being added.
3&4
All of the above.

The Debugger tool can be used to ramp the compressor up and down when attached to the outdoor unit?

True
False

The debugger tool can be used to simulate the indoor or outdoor unit to verify communication faults?

True
False

The The Debugger tool connects to

L1(1), L2(2) and S(3) terminals
Outdoor main board
Retrieving data. Wait a few seconds and try to cut or copy again.
Fan driver board
All of the above

With the Debugger tool do you need an indoor unit connected to operate the outdoor unit?

Indoor unit must be piped in
indoor unit must be electrically connected
indoor unit is not needed

To properly charge a unit you must know the __________.

super heat
sub-cool
line lengths
speed of the compressor
suction pressure

Will I practice what I have learned today? And do my best to represent my industry as a professional?

Yes
No

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