Retrotec DM-2A Uživatelský manuál stáhnout pdf (Strana 4)

Page 4 of 72

©Retrotec Inc. 2012

To change the European Separator units............................................................................................................ 25

3.1.11 Sig Figs .............................................................................................................................................. 25

To change the number of Significant Figures ...................................................................................................... 25

3.2 Device Setup ...................................................................................................................... 25

3.2.1 Enable and Disable Devices ................................................................................................................... 27

To enable/disable Devices ................................................................................................................................. 27

3.2.2 Enable and Disable Range Configurations .............................................................................................. 27

To enable/disable Flow Range configurations in Device [Setup] ......................................................................... 28

3.3 Mode Setup ....................................................................................................................... 28

To configure Modes: .......................................................................................................................................... 29

4 Understand the Pressure Gauge ....................................................................... 30

4.1 Differential Pressure .......................................................................................................... 30

To measure a pressure ...................................................................................................................................... 30

4.2 Positive vs. Negative Pressure ........................................................................................... 30

Measure a negative pressure ............................................................................................................................. 31

4.3 Analog Magnehelic Gauges ............................................................................................... 31

Retrotec’s magnehelic gauge system (right). ...................................................................................................... 32

5 Reduce Bias pressures, static or fluctuating ..................................................... 33

Reduce fluctuating pressures created by wind .............................................................................. 33

6 Reduce uncertainty in results by taking lots of readings .................................. 35

7 Check your gauge to see if it needs to be sent to factory for re-calibration .... 36

7.1 Verify your gauge calibration between factory calibrations .............................................. 36

To perform a tubing check ................................................................................................................................. 36

To perform a cross port check............................................................................................................................ 37

To perform a T-connection Fan Pressure check .................................................................................................. 38

To perform a syringe check (not as good as the cross-channel check) ................................................................. 38

8 Use the Gauge with a calibrated fan for air leakage testing ............................. 40

8.1 Making the Connections .................................................................................................... 40

8.1.1 Pressure port connections ..................................................................................................................... 40

8.1.2 Control connections .............................................................................................................................. 41

To connect the gauge to a Retrotec fan or variable speed fan drive .................................................................... 41

To connect the gauge to a Minneapolis Model 3 or Model 4 Fan ........................................................................ 42

8.2 Control a fan with the gauge to measure pressure and flow ............................................. 42

To conduct a basic pressure test and ensure your gauge is working .................................................................... 42

8.3 Measure Air Handler flow using Hole Flow on the gauge .................................................. 43

To create an Exhaust Fan Flow Meter ................................................................................................................ 43

9 Troubleshooting ................................................................................................ 45

9.1 Check if moving tubes are causing fluctuating pressure .................................................... 45

To see the effect of a moving tube ..................................................................................................................... 46

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Retrotec DM-2A Uživatelský manuál Strana 4

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