Retrotec DM-2A Manual de usuario descargar pdf (Pagina 20)

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©Retrotec Inc. 2012

Set Pressure

The DM-2 can automatically control the fan speed on ‘Q’ model systems to achieve a

user set building pressure. This is the easiest method to achieve a specific test pressure.

To use the Set Pressure function

1. Press [Set Pressure] to activate the automatic control. Input the desired building pressure

using the DM-2 keypad and press [Enter] to start the fan.

2. The fan will accelerate until the input pressure has been reached, or the fan reaches 100%

speed. The fan will continue to hold at that pressure, regardless of changes to the enclosure

or room (i.e. opening/closing windows and doors, HVAC on/off, sealing, etc.).

3. Press [Exit] to stop the fan, and cancel the Set Pressure.

If the pressure is set to “0” Pa, the DM-2 will adjust the fan speed to bring the existing pressure to zero.

This can be used to normalize pressures during specific tests. See the Retrotec DucTester Operation &

Testing manual for an example.

When numerical input is required, the Set Pressure key functions to input the number seven.

Set Speed

The DM-2 can automatically control the fan speed on a ‘Q’ model system to achieve a

specific user-defined fan speed.

To use the Set Speed function

1. Press [Set Speed] to activate the automatic control.

2. Input the desired speed using the DM-2 keypad. Speed is input as a percentage, and can be

any value from 1-100.

3. Press [Enter] to start the fan. The fan will accelerate until the desired speed is achieved.

4. Press [Exit] to stop the fan and cancel the Set Speed, or press [Set Speed] [0] [Enter] to stop

the fan.

When numerical input is required, the Set Speed key functions to input the number eight.

Jog/Hold

Jog/Hold functions differently depending on which mode the DM-2 is currently in. The

key has two functions:

Hold

 Freezes the display with the data currently displayed on the screen. Nothing will change until the

Jog/Hold key is pressed again to clear "Hold".

 Can be activated at any time.

 Allows the recording of instananeous results (eg. Flow, EqLA, PrB at pricisely the same time)

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Retrotec DM-2A Manual de usuario Pagina 20