2024 Gas Furnace Training Day 2 Test

What does FER stand for

Furnace Efficiency Rating

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Furnace Efficiency Ratio

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Fan Efficiency Rating

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Fan Energy Rating

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Why did the reason FER was implemented?

To get rid of PSC blowers

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To save energy

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To sell more ECM motors

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To get better airflow

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Of the 4 motors currently available which one does the least de-humidification?

VCA

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VCT

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FCT

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MCT

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The VCA motor is?

Fully communicating

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Constant airflow, even as ESP increases

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80% or 85% electrical efficiency

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All of the above

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None of the above

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What happens to the airflow at 1″ of static on a furnace with a VCT motor?

It stays the same

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It reduces airflow by 10 ton 15%

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It reduces airflow by 15 to 20%

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It locks out

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The MCT motor is?

The new base-tier motor

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Works as good as the PSC motor

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The new high efficiency motor

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The new variable speed blower motor

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True or False: A hole or crack in a heat exchanger large enough to expose flue gases to the conditioned air stream causes CO to enter the air stream?

TRUE

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FALSE

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It depends

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True or False: Gas line can enter from either side with a flexible connector?

TRUE

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FALSE

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Where do you find the venting information?

The installation instructions

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GAMA venting tables

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A YouTube video

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What is the CFM of a gas furnace that is 110,000 BTUH input, 80% AFUE, and has a 45° Delta T (temperature rise)?

1862

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1811

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1852

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2000

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How does a gas furnace measure the CO?

A sensor in the heat exchanger

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Gas furnaces do not have integral CO detectors

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The pressure switch

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By the thermostat

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Carbon Monoxide Is a ___________, _____________, and _____________ gas.

Invisible

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Odorless

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Toxic

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Liquid

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Only homes with gas appliances should have CO detectors/monitors?

TRUE

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FALSE

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When twinning 2 furnaces can you have 2 different model numbers?

TRUE

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FALSE

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Based on this table what size vent pipe should you use for a 110,000 BTU 80% AFUE Natural Draft Gas Furnace with 6′ of vent height?

GAMA Vent Tables

4"

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5"

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6"

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7"

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A sediment trap is required on the gas line when __________________.

Only when unit is installed in a horizontal application

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Only when unit is installed in a downflow application

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Only when unit is installed in a upflow application

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Always

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Which motor can be used with Infinity / Evolution Products?

VCA

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VCT

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FCT

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PCM

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What does FCT stand for when referring to ECM motors?

Fixed-Speed Constant Turn

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Fixed-Speed Constant Torque

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Variable-Speed Constant Torque

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Fixed Velocity with Constant Torque

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What does VCA stand for when referring to ECM motors?

Variable-Speed Constant Airflow

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Variable Communicating Algorithm

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Veterinary Centers of America

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Velocity with Constant Airflow

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How do you contact Tech Support from the field?

Wingman app

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www.cesctechsupport.com

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sc.techsupport@carrierenterprise.com

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1-800-486-0550

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All of the above

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A single wall connector is acceptable in which application?

If the furnace is in a crawlspace

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If the furnace is upflow in a closet

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If the furnace is in the attic

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Never

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What is the last thing you do when converting a furnace to Propane?

Install spoiler screws

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Install Conversion Responsibility Label

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Check inlet gas pressure

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Wire LGPS in PRS circuit

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When twinning 2 furnaces the left hand furnace is __________?

The one on the left

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The upflow one

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The master

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The bigger one

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Where do you take the static pressure measurements for TESP?

In the plenums

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Just the supply plenum

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The inlet and outlet of the furnace

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It's really not necessary

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Where can I find the airflow if I know the static pressure?

The installation instructions

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Product Data

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The internet

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Phone a friend

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How do you determine a pressure switch break point?

Call Tech Support

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Look in the instructions

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Look at the label

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What tools do you need to troubleshoot a pressure switch?

Jumpers

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Meter

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Manometer

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all of the above

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only 1 and 3

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What tools do you need to troubleshoot a limit problem?

Jumpers

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Temperature probe

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New limit switch

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Manometer

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1, 2 and 4

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1 and 2

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Where do you find the temperature rise for the unit?

Nameplate

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Product data

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Call Technical Support

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AHRI Website

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Are there other components in the limit switch circuit that could show a limit fault?

Yes

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No

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The VCA motor is _________.

Fully communicating

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Constant airflow, even as ESP increases

Correct Incorrect Correct answer

80% or 85% electrical efficiency

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All of the above

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None of the above

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In the component self test, how many seconds is the gas valve open?

30

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45

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60

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0

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When replacing a furnace, is it safe to assume since there was a 100, 000 BTU unit there before, you can install another one of the same size?

Yes

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No

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It depends on what the other contractor is going to do

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What should the manifold pressure be for a single stage furnace on Natural gas?

1.7"wc

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3.5"wc

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4"wc

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What should the incoming gas pressure be at the gas valve inlet of a natural gas furnace?

10"wc

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4"wc

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7"wc

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16"wc

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What is a normal flame signal when testing?

2-6 VDC

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2-4 DC micro-amps

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24 volts A/C

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24vdc

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To test the microamps on a flame sensor the meter must be capable of reading microamps and the leads must be connected how?

From the flame sensor to ground

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From the board to the flame sensor while connected

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By connecting one lead to the flame sensor and the other to the wire lead.

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Clamping the meter around the flame sensor wire

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On a 110,000 BTU 80% AFUE gas furnace with a 36° degree temperature rise what is the airflow in CFM?

2292

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2263

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2475

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3045

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Using this diagram, what relay contacts must close for the Induced Draft Motor to energize?

HSIR

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BHT/CLR

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LPGS

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IDR

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Using this diagram, if FU1 is open will the thermostat have power?

Yes

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No

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What does NFC stand for?

Near Field Communication

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New Furnace Control

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Near Field Comfort

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New Furnace Communication

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What app is required to connect to the NFC control board?

The CE Contractor Assist app

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The Carrier/Bryant Service Tech app

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HVAC Partners

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www.cesctechsupport.com

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NFC Control board setup

The NFC control board must be setup using the dip switches prior to startup.

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The Infinity controller will configure the NFC control board

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The NFC control board can be configured via the Carrier/Bryant Service Tech app or with the onboard display and buttons

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The NFC control board can be configured via the Super Plug Connector on a new furnace

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What is the test sequence on the NFC control board? (place the correct answers in the correct order)

Correct Correct Answer Incorrect

View Answers:

Which wire feed a constant 15VDC to the PWM motor?

Brown wire

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Yellow wire

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Which wire provides feedback FROM the motor to the furnace control?

Brown wire

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Yellow wire

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The blower motor always has power as long as the furnace is powered up?

True

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False

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