Appendix A Quick Guides for Using the DG-700 with Energy Conservatory Test Devices
Cruise Overview
Cruise Control uses the DG-700’s fan control feature to continuously adjust the Blower Door or Duct Blaster fan to
maintain a constant Cruise target pressure on Channel A of the gauge. Cruise Control can be used in the following gauge
Modes to maintain the listed target pressures:
Before starting Cruise, the Blower Door or Duct Blaster and DG-700 should be completely set-up (including tubing
connections), the gauge should be in the Mode you wish to use, and the correct Device and Configuration settings should
be entered. If you wish to Cruise with a baseline pressure adjustment applied to Channel A, simply use the Baseline
feature first before beginning Cruise. You will also need to install the fan control cable and turn the fan speed controller to
the “just on” position:
Model 3 Blower Door “just on” - from the off position, turn the controller knob clockwise only until you feel the
click and no farther - the fan will not be turning.
Duct Blaster “just on” – turn the controller knob all the way down (counter-clockwise) and flip the on/off switch
to “ON” – the fan will not be turning.
Begin Cruise button: When you are ready to begin Cruise, press Begin Cruise to enter Cruise setup. A Cruise target
pressure will appear in the Channel A display and the Cruise icon will flash. The flashing Cruise icon indicates that the
gauge is ready to begin Cruising but is not yet controlling the fan. If you are in the PR/ FL or PR/ PR modes, you may
change the Cruise target pressure at this point by pressing the Cruise Target button. Note: You can not change the Cruise
target pressure when in the PR/ FL @50 and PR/ FL @25 modes.
Start Fan button: Press Start Fan to instruct the DG-700 to begin ramping up the fan to achieve the target pressure on
Channel A. The fan will slowly start increasing speed until the pressure reading on Channel A matches the Cruise target
pressure. The fan will simply run at full speed if the target pressure can not be achieved. Whenever the DG-700 is calling
for full fan speed, the gauge will emit a beeping sound.
Stop Fan button: Press Stop Fan to turn off the fan when you are done Cruising. When the fan is turned off by pressing
Stop Fan, the DG-700 returns to the Cruise setup state (i.e. the Cruise icon is flashing and a Cruise target pressure is
displayed on Channel A). You may re-start Cruise again by pressing Start Fan, or exit the Cruise feature altogether by
pressing the CLEAR button.
The fan will also be stopped while Cruising under the following circumstances:
- If Channel A registers a pressure of 100 Pa or more, the fan will automatically be shut down and the gauge will
revert back to the Cruise setup state.
- Pressing the HOLD button will shut down the fan and freeze the display. Pressing Start Fan from a display
freeze will re-start Cruise. Pressing the HOLD button a second time from a display freeze will return the gauge
to the Cruise setup state.
- The DG-700’s auto-off feature will shut down the gauge and turn off the fan after 2 hours of run-time (if no
buttons are pressed during that time).
Cruising Zero (+0 and -0)
Cruising Zero is designed for specialized testing and research applications. Cruising Zero is useful if you want to control
the Blower Door fan to remove an existing pressure from a building , duct system or other enclosure. When using the fan
to pressurize a space (that is currently depressurized) use +0 as your Cruise target pressure. When using the fan to
depressurize a space (that is currently pressurized), use –0 as the Cruise target pressure. Refer to specific test procedures
for more information on using Cruise Zero.
Cruise Target Pressures Available
75 Pa, 50 Pa, 25 Pa, +0, -0
75 Pa, 50 Pa, 25 Pa, +0, -0
37
Operating Instructions
for the DG700
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