2023 Inverter Driven Unit Day 2 Test

One of the best ways to get information on Carrier & Bryant equipment is to _____________________.

Download and Use the Carrier/Bryant Mobile App

Correct Incorrect Correct answer

Search on Google

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Call tech support

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Ask my boss/supervisor

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On the the Carrier/Bryant Mobile App what features are available?

Barcode scanning of unit’s serial or model number

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Literature list for models and ability to search all available literature

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Product Catalog model lookup

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Bill of Material parts list including part supersession

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Warranty entitlement & service history

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Aftermarket components cross reference tool

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Distributor store locator

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Tech Tips videos for installation guides, troubleshooting help and best practices

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Instant authentication with support for fingerprint and facial recognition on compatible devices

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Interactive Troubleshooting tool

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All of the above

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What is the most unique feature added to the Infinity® 26/24 with Greenspeed Intelligence & Evolution™ Extreme 26/24 systems?

It's 84" tall to make service easier

Correct Incorrect Correct answer

Has Bluetooth technology to aid in diagnostics

Correct Incorrect Correct answer

Is round shaped

Correct Incorrect Correct answer

Has a ceramic coated condenser coil.

Correct Incorrect Correct answer

Where is it recommended to install the filter/drier on the 24VNA6/25VNA4 – 186CNV / 284ANV 4 ton unit and smaller?

Near the indoor coil

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Near the outdoor unit

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A filter/drier is not required for these units

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At the easiest location

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What terminals are required to be hooked up for proper operation on the 24VNA6/25VNA4 – 186CNV / 284ANV?

A & B

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A, B & C

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A, B, C & D

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A, B + Shield

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What is the purpose of the Braze Plate Heat Exchanger in the 5 ton machines?

Help with refrigerant noise

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Increase capacity

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Keep refrigerant from migrating

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No longer require an accumulator

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What is the most unique feature added to the Infinity® 26/24 with Greenspeed Intelligence & Evolution™ Extreme 26/24 systems?

It's 84" tall to make service easier

Correct Incorrect Correct answer

Has Bluetooth technology to aid in diagnostics

Correct Incorrect Correct answer

Is round shaped

Correct Incorrect Correct answer

Has a ceramic coated condenser coil.

Correct Incorrect Correct answer

What does the PCM sense to control the EXV in heating mode?

Indoor static pressure

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suction pressure and temperature

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Discharge temperature and pressure

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Outdoor ambient temperature

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The green LED on the PCM board indicates what?

Fault codes

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Power on to the outdoor unit

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Successful communications

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24 VAC Present at the outdoor unit

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When does the ECM fan motor NOT operate?

Off cycle and defrost

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Low ambient condition

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Defrost and during low ambient operation

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When the compressor isn't operating

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A flashing amber LED on the PCM board indicates what?

Fault codes and operation

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Power on to the outdoor unit

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Successful communication with the other system products

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24 VAC Present at the outdoor unit

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All 26/24 SEER Greenspeed/Extreme units have a Braze Plate Heat Exchanger and an EXV?

Yes, all sizes have a Braze Plate Heat Exchanger and and EXV

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ONLY The 2 and 3 Ton have a Braze Plate Heat Exchanger and an EXV

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ONLY The 5 ton machine has a Braze Plate Heat Exchanger and an EXV

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ONLY The even size machines have a Braze Plate Heat Exchanger and an EXV

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ONLY The 5-Stage equipment has the Braze Plate Heat Exchanger and an EXV

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The PCM board was formerly know as the ____________ board?

Defrost board

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MOC board

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AOC board

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Inverter

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The PCM board has _____ fuse/s?

1 non-replaceable fuse for incoming power

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2 fuses

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3 fuses

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4 fuses

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With the Bluetooth module you can_______________?

Update the outdoor unit software/firmware

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See live operating pressures

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See unit fault history

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See voltages

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All of the above

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The crankcase heater is energized when the outdoor temperature drops below __________°?

45°

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50°

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55°

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60°

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These units use a 5vdc output discharge and suction pressure transducer, what is the vdc range expected to be seen?

2.5-5vdc

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0-5vdc

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2-10ma

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4-20ma

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What version of software MUST the UI be updated to?

3.62 or higher

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4.05 or higher

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3.00 or higher

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As long as as it is a communicating UI it will work

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What is the MAX. outdoor ambient temperature for cooling mode?

116°

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125°

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105°

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130°

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What is the MAX outdoor ambient temperature for heating mode?

66°

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60°

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70°

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72°

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What is the maximum equivalent length of lineset allowed?

80'

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120'

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250'

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As long as my lines are sized accordingly, it doesn't matter

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Where is it recommended to install the filter/drier on the 5 ton unit?

Near the indoor coil

Correct Incorrect Correct answer

Near the outdoor unit

Correct Incorrect Correct answer

A filter/drier is not required for these units

Correct Incorrect Correct answer

At the easiest location

Correct Incorrect Correct answer

What does the solid red LED indicate?

Alarm status

Correct Incorrect Correct answer

Power at the inverter

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Not communicating

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In heating mode

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What is the maximum equivalent line length for the 5-stage unit?

85'

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100'

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150'

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200'

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What is the fastest way to update the UI software?

Using Wi-Fi

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Using your phone hotspot

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Using a MicroSD Card

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The UI should have the most current version of software so I don't need to update it

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What voltage should you measure when checking on the “A” to “B” terminals when power is applied and a User Interface is connected?

0-10vdc

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~2.5 to 3.9vac

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~0.1 to 0.9vdc

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~2.5 to 3.9vdc

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How many steps does it take for the stepper motor on the EXV to go from fully open to fully closed?

575

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475

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350

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625

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What is the Bluetooth signal range?

50'

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10'

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25'

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100'

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Line of sight

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What position is the EXV in during cooling mode?

Open

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Closed

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Depends on the demand

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What is the correct answer using the formula below when testing a transducer? Your measured output vdc on white and black is 2.5vdc

Suction Pressure psig = 50.0 x (DCV out – 0.5)

150psig

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125 psig

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100 psig

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75 psig

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Which of the following is not a method to provide updates?

OTA – Over the Air

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MicroSD™

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USB cable

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BTM – Bluetooth® Module

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At what range of RPM’s does the ECM motor operate at?

500 to 1050 RPM

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200 to 1500 RPM

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1075 RPM

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It is a PSC motor

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How many components are updatable in a 26/24 SEER Greenspeed/Extreme system?

1

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2

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3

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4

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What is the default defrost interval set at?

120 minutes

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90 minutes

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60 minutes

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30 minutes

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Auto

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Which thermistor is NOT a 10k NTC resistor in Inverter driven units?

OAT = Outdoor Ambient Temperature
OCT = Outdoor Coil Temperature
OST = Outdoor Suction Temperature
ODT = Outdoor Discharge Temperature

OAT

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OCT

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OST

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ODT

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What voltage should you measure when checking on the “A” to “B” terminals when power is applied and NO User Interface is connected?

0-10vdc

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~3vac

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~3vdc

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24vac

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What is the method to recall fault codes when there are no fault code present at your time of service?

Place a jumper wire across the force defrost pins and read the recent fault code

Correct Incorrect Correct answer

Power the unit down, place a jumper on the force defrost pins and power the unit back on and read the recalled fault code

Correct Incorrect Correct answer

Look at the last 10 system events in the User Interface

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There is no way to recall fault codes once power has been cycled

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How do you read the active fault codes using the status LED on the control boards?

Count the fast/short flash 1st then slow/long flash 2nd and add the two together to get your fault code

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Count the fast/short flash 1st then slow/long flash 2nd and that is your fault code. Fast is 1st and slow is 2nd 1 short flashes followed by 6 long flashes indicates a 16 fault code

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Look at the last 10 system events in the User Interface

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Read the scrolling matrix display on the board

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When checking a transducer that has power while connected to the ODU board and power is applied, what color wires would you check for your voltage output?

White and black (ground)

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White and red

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Black (ground) and red

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At what pressure does the High Pressure Switch open at?

480 psig

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600 psig

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570 psig

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670 psig

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