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MEASURE DYNAMIC SYSTEM SUPERHEAT / SUB-COOLING - Continued
The system superheat value is displayed along with the actual temperature and pressure
readings. Sub-cooling is measured in the same way, except the temperature probe is attached
to the liquid line, and the pressure transducer is attached to the high side access port.
NOTE: SUPERHEAT MEASUREMENTS USE T1 AND U1; SUB-COOLING MEASUREMENTS USE
T2 AND U2.
MEASURE RELATIVE HUMIDITY AND DRY-BULB TEMPERATURE
Connect a Cooper relative humidity probe to either U1 or U2 (or both). The MFM300 will sense
the probe and display the relative humidity and dry-bulb temperature measurements with the
appropriate U1 or U2 label.
DISPLAY PSYCHROMETICS
Connect a Cooper relative humidity probe to either U1 or U2 (or both). Press the PSYCH
button to display the psychometrics calculated from the current relative humidity and dry-bulb
measurements. Press the PSYCH button again, or CANCEL to return to Normal Mode.
MEASURE AIRFLOW
Connect a Cooper anemometer to either U1 or U2 (or both). The MFM300 will display airflow
in feet per minute (FPM) and temperature. To display airflow in cubic feet per minute (CFM),
press the ALT button. To insure that the correct cubic feet per minute values are displayed,
you must enter the shape and size of the duct opening where airflow is being measured. To do
this, press the MENU button while viewing CFM. Use the on-screen directions to enter the duct
shape and size and press the ENTER button when done.
AIR BALANCING
To perform basic Air Balancing, the MFM300 will calculate the average CFM and FPM using all
entered readings. While viewing CFM, press the AVG button while measuring airflow. Each time
the AVG button is pressed, new average values are calculated based upon the measurement
being taken. The display will show the average CFM and FPM and the number of individual
readings taken. To clear all average values, press the MENU button and then press the AVG
button.
NAVIGATE THE MENU
Additional functions and settings are available through the MFM300 MENU. Press the MENU
button to display the top-level menu and use the UP / DOWN ARROW buttons to select a menu
option, then press the ENTER button.
MENU FUNCTIONS
Adjust contrast: Allows display contrast to be changed to suit lighting situation. Use the
UP / DOWN ARROW buttons to set contrast and press the ENTER button to complete. Press
the CANCEL button to abandon changes.
View GL100 Log: Manage up to five data logger downloads stored in MFM300 memory.
Pressure / temp chart(s): Select the desired refrigerant by pressing the REF button, then use
the UP / DOWN ARROW buttons to scroll to the desired refrigerant and press the ENTER button
