Airflow Evaluation form – Carrier Enterprise Mid-Atlantic Technical Support Site

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This form will walk you thru the needed steps to help assist in checking airflow for your system.

All you will need is your normal hand tools to complete the tasks.

Name *

First

Last

Dealer/Company Name *

Email *

Phone *

Job Site Name *

If you all ready working with a Customer Assurance Manager please select them below

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Indoor Unit and Airflow information

Industry standard is 400 +/- 50 cfm per a ton of cooling. Example a 3 ton system our goal is a minimum airflow of 1050 cfm or a maximum of 1350 CFM.

Do you have a gas furnace or fan coil? *

Gas furnace
Fan Coil

Furnace Model # *

Furnace Serial # *

Evaporator Coil Model # *

Evaporator Coil Serial # *

Fan Coil Model # *

Fan Coil Serial # *

What type of control do you have? *

User Interface Touchscreen (Communicating)
24v control

User Interface

Any fault codes in the USER Interface history? *

Go into the service menu by pressing and holding the service hat icon until it turns green, once in the installation & service menu, page down by pressing the carrot in the bottom right corner and then select service information. Then select last 10 system events.

Pictures of last 10 system events

Click or drag files to this area to upload. You can upload up to 10 files.

Please take a picture of each event

User Interface Touchscreen (Communicating)

Go into the service menu by pressing and holding the service hat icon until it turns green. Then select the installation option, then select the blower assessment test, start the test, it will take about 3 mins to complete, once the test is complete record the information below.

System CFM *

System Static Pressure *

Blower RPM *

Minimum CFM *

How would you like to check the airflow? (Fan Coil) *

Elect Heat Method – using formula
Static Pressure Method – using product data

How would you like to check the airflow? (Gas Furnace) *

Clock The Meter Method
Static Pressure Method – using product data

Is this a 80% or 90+% efficient furnace? *

80% Furnace Model Families *

58TN/880TA
58TP/820TA
58SP/820SA
58SC/810SA
58SB/800SA
58CVA/315AAV
58STA/310AAV
58CTW/314AAV
58PHA/58PHB/313AAV/313ABV
Not listed(other)

90+% Furnace Model Families *

59MN7/987M
59TN6/986T
59TP6/926T
59SP6/926S
59SC5/915S
59SC2/912S
58MVP
Not listed(other)

58TN/880TA

Board dip-switch settings, 2-stage, ECM

59MN7/987M

Board dip-switch settings, 2-stage, ECM

59TN6/986T

Board dip-switch settings, 2-stage, ECM

58MVP

Board dip-switch settings, 2-stage, ECM

58CVA/315AAV

Board dip-switch settings, 2-stage, ECM

SW1-4 *

SW1-5 *

SW2-1 *

SW2-2 *

SW2-3 *

SW3-1 *

SW3-2 *

SW3-3 *

SW4-1 *

SW4-2 *

SW4-3 *

59TP6/926T

Board dip-switch settings, 2-stage, PWM ECM

58TP/820TA

Board dip-switch settings, 2-stage, PWM ECM

58SP/820SA

Board dip-switch settings, 1-stage, PWM ECM

59SP6/926S

Board dip-switch settings, 1-stage, PWM ECM

SW1-4 *

SW1-5 *

SW2-2 *

SW2-3 *

SW2-4 *

SW2-5 *

SW2-6 *

SW2-7 *

SW2-8 *

58STA/310AAV

Wires, 1-stage, PSC

Color wire used for HEAT *

Black
Blue
Red

Color wire used for Cool *

Black
Blue
Red

58CTW/314AAV

Board dip-switch settings, 2-stage, ECM

SW2-2 *

SW2-6 *

SW2-7 *

SW2-8 *

58PHA/58PHB/313AAV/313ABV

Wires, 1-stage, FCT, multi-speed ECM

58SC/810SA

Wires, 1-stage, FCT, multi-speed ECM

59SC2/912S

Wires, 1-stage, FCT, multi-speed ECM

59SC5/915S

Wires, 1-stage, FCT, multi-speed ECM

58SB/800SA

Wires, 1-stage, FCT, multi-speed ECM

Color wire used for HEAT *

Gray
Yellow
Blue
Orange
Red

Color wire used for Cool *

Gray
Yellow
Blue
Orange
Red

Fan Coil Family *

FV4C
FB4C/FZ4A/FX4D
FMA4X
FMA4P
FH4C/FY5B/FF1E

FV4C

Easy Select Board, motor 16-pin ECM motor. Looking at the board from left to right the 24v connections are to the right.

AUX heat KW/CFM, the violet wire *

Spot 1
Spot 2
Spot 3
Spot 4

AC/HP Size, the blue wire *

Spot 1
Spot 2
Spot 3
Spot 4

System Type, the orange wire *

AC
HP-COMFORT
HP-EFF

AC/HP CFM Adjust, the black wire *

ON/OFF Delay, the white wire *

0/90
30/90
0/0
ENH

Continuous Fan, the yellow wire *

FB4C/FZ4A/FX4D

FCT ECM motor

FMA4X

FCT ECM motor

Tap used for HEAT the white wire *

Tap used for Cool the blue wire *

FMA4P

PSC motor

FH4C/FY5B/FF1E

PSC motor

Color wire used for HEAT *

Yellow
Black
Blue
Red

Color wire used for COOL *

Yellow
Black
Blue
Red

Static Pressure

Record the static pressure with a manometer. Measure the return and the supply separately and then add together to get the total static. Forget the + and – and just add the numbers together. Example +.5 measured in the supply and -.3 measured in the return = .8 in wc Total static. Reminder this is a Blower, not a sucker. DO NOT worry about entering the + or the – or the decimal point(.), just enter the number displayed on your manometer.

Layout

A. Supply Static after the Evaporator coil *

B. Supply static between the Furnace and Evaporator coil *

If you do not have a spacer between your gas furnace or coil to get the pressure reading. Yes you will need to drill a hole in the side of the furnace(just in the top 2-3″of the cabinet, and just enough to penetrate the cabinet).

C. Gas Furnace Return Static *

If there is a add-on filter outside of the gas furnace. Take this measurement between the Add-on filter and the gas furnace.

Gas Furnace Total Static *

Now refer back to the product data to evaluate performance against the static pressure charts.

Would you like to watch a video on how to do this?

Supply Static for the fan coil *

Fan Coil Return Static *

The return static should never exceed .4″

Fan Coil Total Static *

Now refer back to the product data to evaluate performance against the static pressure charts.

Clocking the gas meter if you have natural gas

All you need is a watch with a second hand or a stopwatch. You can use your phone, it has a clock and a stopwatch.

Note

When checking airflow for cooling operation you must first take the furnace and set it up for cooling airflow when the furnace is operating for this test.

You may have to change the wire speed tap on your motor or IFC.

For the IFC take the wire used on the cool tap of the board and move it to the heating tap of the board for this test.

For a X13/Constant Torque motor take the wire from the heating tap and move it to the cooling tap for this test.

For a variable speed furnace without a User Interface adjust your dip switches to match the cooling airflow as close as possible.

Once the change has been made place the unit in the heating mode and turn off all other natural gas appliances. Go to the gas meter and time how many seconds it takes for the furnace to consume 1 cubic foot of gas. And then measure the temperature spilt of the gas furnace at the furnace.

Would you like to watch a short video on how to do this test? *

Seconds to consume 1 cubic foot of gas *

Return Temperature *

Use the same thermometer to measure the temperatures.

Supply Temperature *

Use the same thermometer to measure the temperatures.

Calculating gas furnace airflow by clocking the gas meter

Verify input BTU of furnace: 3600 sec in an hour / Seconds per a cubic foot of gas the furnace consumed = cubic feet per an hour consumed X AVG BTU content of 1050 = give us the input BTU’s of the furnace. Make sure it is within 2% of input valve listed on the nameplate of the furnace. If not adjust gas pressure. Then take the output rating listed on the nameplate and / temperature split / 1.08 = CFM. Example 3600 secs / 62 sec to consumer 1 cubic foot = 58 cubic feet of gas consumed X 1050 = 60,900 Btu’s Input, Nameplate say 60k input, we are good as long as within 2%. Then look at output rating of the furnace 54kbtu. Take the 54,000 Btu output / your temperature split(52F measured) / 1.08 = 961 CFM.

Electric Heat

Place the unit in emergency heat and run for about 10-15 minutes while you are gathering your measurements, yes even on a 90 degree day. Take the blower door off and measure the High Voltage going to the Fan Coil(you can also get this in the disconnect), after the door is OFF, measure the amp draw of L1 or L2 coming into the fan coil, total system amp draw, while the door is off, get an amp draw of the fan motor. Then place the door back on the unit and measure the temperature split of just the elec. heat at the fan coil.

High Voltage *

This is the power coming to the fan coil.

Total Fan Coil Amp Draw *

Indoor Fan Motor Amp Draw *

Electric Heat Amp Draw *

Take the total measured amp draw of the fan coil and subtract the indoor fan motor amp draw. This will give you the amp draw of just the Elec heat.

Return Temperature *

Use the same thermometer to measure the temperatures.

Supply Temperature *

Use the same thermometer to measure the temperatures.

Electric Heat formula for Residential CFM 1Ph power

VOLTS X AMPS X 3.41 / 1.08 / Elec heat temperature split = CFM

Electric Heat formula for Commercial CFM 3Ph power

VOLTS X AMPS X 3.41 X 1.73 / 1.08 / Elec heat temperature split = CFM

What is your calculated CFM?

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