General Tools DCFM8906 User Manual v.1

DIGITAL ONE PIECE

AIRFLOW METER WITH

CFM DISPLAY

USER’S MANUAL

DCFM8906

Please read this manual carefully and thoroughly before using this product.

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

What’s in the Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 4 –8

Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Install Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . 9 – 23

Making Basic Air Speed Measurements . . . . . . 9 – 11

Recording Air Speeds at a Single Point . . . . . . 11 – 13

Displaying the Average Air Speed at

Multiple Points . . . . . . . . . . . . . . . . . . . . . . . 13 – 16

Converting to Airflow Volume Measurements 16 – 19

Switching Between Imperial and Metric Units 20 – 22

Disabling Auto Power Off . . . . . . . . . . . . . . . . . 22 – 23

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Maintenance Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Warranty Information . . . . . . . . . . . . . . . . . . . . . 25 – 26

Return for Repair Policy . . . . . . . . . . . . . . . . . . . . . . . 26

INTRODUCTION

Thank you for purchasing General Tools & Instruments’ DCFM8906 Digital One Piece Airflow Meter with CFM Display. Please read this user’s manual carefully and thoroughly before using the instrument.

The DCFM8906 is a professional-grade vane anemometer that can not only measure air speeds exiting an HVAC/R system’s or blower’s grille or register, but also convert those readings to airflow volume measurements. The conversions are possible because the meter makes it easy for an installer or repairman to enter the free area dimensions of his system’s output ductwork.

The meter can record air speed readings at one point or multiple points for up to two hours and convert those readings into displays of average, minimum and maximum air speed or airflow volume. The unit can hold measurements made in the dark for later viewing in a brighter area. It also measures ambient air temperature and displays it simultaneously with air speed or airflow volume on a large front-panel LCD.

The DCFM8906 can display its air speed and airflow volume measurements in Imperial or metric units and its temperature measurements in degrees Fahrenheit or Celsius. A 20-minute auto power off function (which can be disabled to enable longterm recordings of air speed) helps extend battery life.

The DCFM8906 is powered by one 9V battery (included).

KEY FEATURES

• Measures and displays air speed and airflow volume in Imperial or metric units

• Simultaneously displays temperature in °F or °C

• One-handed operation

• Records average, minimum and maximum air speed at a single point or multiple points

• Data hold

• Auto power off

• CE and RoHS approved

WHAT’S IN THE CASE

The DCFM8906 comes fully assembled in a custom molded plastic case along with a “9V” battery and this user’s manual.

PRODUCT OVERVIEW

Figure 1 shows the labels and positions of the six control buttons on the front of the DCFM8906. The figure also shows all possible indications on the LCD below the control panel. Familiarize yourself with the buttons’ functions and the meanings of the display indications before moving on to the Setup Instructions.

Fig. 1. The DCFM8906’s controls and indicators

CONTROL BUTTONS

ON-OFF RESET

Turns meter on and off When pressed with AVERAGE button, resets default air speed and temperature units When pressed with HOLD button, disables auto power off function

MODE VELOCITY FREE AREA FLOW

When pressed, places meter in airflow volume measurement mode Used with HOLD and AVERAGE buttons to enter free area dimensions

AVERAGE MULTI-POINT

When pressed, calculates and displays average of

stored air speed measurements for up to eight points Used with HOLD and MODE buttons to enter free area dimensions in airflow volume measurement mode When pressed with ON-OFF RESET button, resets default air speed and temperature units

HOLD

When pressed, holds (freezes) upper display reading Used with MODE and AVERAGE buttons to enter free area dimensions in airflow measurement mode When pressed with ON-OFF RESET button, disables auto power off function

SEL: MPH KNOTS

In Imperial units mode, cycles through mil/h (mph), knots and ft/m default settings In metric units mode, cycles through km/h, knots, and m/s default settings

MIN/MAX REC SINGLE-POINT

When pressed once, meter begins recording air speed at a single point. Default display is average air speed since recording began Next press changes display to real-time air speed Next two presses change display to minimum and maximum air speeds since recording began Next press returns display to average air speed

All possible display indications and their meanings

vel Upper reading is an air speed measurement FLOW Upper reading is an airflow volume measurement AREA Lit during entry of free area dimensions Hold Upper and lower readouts are locked (frozen) PH Reserved for future use Knots Air speed unit equal to 1.85 km/hr (kmph) or 1.15

miles/hr (mph). An upper display unit option in both Imperial and metric modes

ft/m Feet per minute. An upper display air speed unit in

m/s Meters per second. An upper display air speed unit in

mil/h Miles per hour (mph). An upper display air speed unit in

km/h Kilometers per hour (kmph). An upper display air speed in

Imperial mode

metric mode

Imperial mode

metric mode

ft2 Square feet. Lit during entry of free area dimensions in

Imperial mode

Square meters. Lit during entry of free area dimensions

in metric mode

cfm Cubic feet per minute. Unit of airflow volume readings in

Imperial mode

cms Cubic meters per second. Unit of airflow volume readings

in metric mode

°C Degrees Celsius. Temperature unit in metric mode °F Degrees Fahrenheit. Temperature unit in Imperial mode REC Meter is recording air speeds at a single point AVG Upper reading is average air speed recorded during

session

MIN Upper reading is minimum air speed recorded during

session

MAX Upper reading is maximum air speed recorded during

session

–

Temperature reading on lower display is a negative

number

8888 Digits of air speed, airflow volume or free area value (upper reading)

1888 Digits of temperature value. When recording air (lower reading) speeds at multiple points, indicates point number

(from 1 to 8)

SETUP INSTRUCTIONS

INSTALL BATTERY

The meter’s battery compartment is accessible from the back of the unit. Use a Philips-head screwdriver to remove the one screw holding the battery compartment cover in place. Remove the cover and set it aside. Then plug the included 9V battery into the wired socket inside the compartment. The terminals of the battery and the socket mate in only one way, with the smaller male terminal plugging into the larger female terminal. Replace the battery compartment cover and secure it with the Philips-head screw.

OPERATING INSTRUCTIONS

MAKING BASIC AIR SPEED MEASUREMENTS

To power on the meter, press the ON-OFF RESET button. The beeper (which cannot be disabled) will sound once and all display indications will appear briefly. After a few seconds, the readings on the upper and lower displays will stabilize. By default, the upper display reads out air speed in ft/m and the lower display reads out temperature in degrees Fahrenheit. These Imperial system defaults are reflected by three indications (Fig. 2): vel (at upper left), ft/m (to the right of the air speed digits) and °F (to the right of the temperature digits).

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