Appendix A
Quick Guides for Using the DG-700 with Energy Conservatory Test Devices
c)
With the fan inlet still covered press the
BASELINE
button to initiate the building baseline measurement
procedure on
Channel A
. Press
START
to begin the baseline measurement. During a baseline measurement,
Channel A
will display a long-term average baseline pressure reading while
Channel B
is used as a timer in seconds
to show the elapsed measurement time. When you are satisfied with the baseline measurement, press the
ENTER
button to accept and enter the baseline reading into the gauge. The
Channel A
display will now show an
ADJ
icon to indicate that it
is displaying a baseline adjusted building pressure value.
d)
Remove the No-Flow Plate from the Blower Door fan and
install the Flow Ring which you think best matches the needed fan
flow (see Table to the right).
e)
Check (and adjust if necessary) the selected test Device (i.e.
fan) and Configuration (i.e. Flow Ring) shown in the upper part of the gauge display to match the fan and Flow Ring
being used in the test. For example, the Device icon for the Model 3 (110V) Blower Door fan is
BD 3
, and the
Configuration icon for Ring A is
A1
. Press the
DEVICE
button to change the selected fan. Press the
CONFIG
button to change the selected Flow Ring.
f)
Turn on the Blower Door fan.
If Using Cruise Control:
Turn the Blower Door speed control knob to the “just on” position (i.e. from the off position, turn the
controller knob clockwise only until you feel the click and no farther, the fan will not be turning). Now
press the
Begin Cruise (Enter)
button. The
Channel A
display will now show the number 50 (your target
Cruise pressure). Press the
Start Fan (Start)
button. The Blower Door fan will now slowly increase speed
until the building depressurization displayed on Channel A is approximately -50 Pascals.
If Manually Controlling Fan:
Turn on the Blower Door fan by slowly turning the fan controller clockwise. As the fan speed increases, the
building depressurization displayed on
Channel A
should also increase. Continue to increase the fan speed
until the building depressurization shown on
Channel A
is between –45 and –55 Pascals. Do not waste time
adjusting and re-adjusting the fan speed control to achieve a test pressure of exactly –50 Pascals.
g)
Channel B
will now display the One-Point 50 Pascal leakage estimate. Record this number. If the leakage
estimate is fluctuating more than desired, try changing the Time Averaging setting on the gauge by pressing the
TIME AVG
button and choosing the
5
or
10
second or
Long-term
averaging period. (If “
------
“ or “
LO
” appear on
Channel B
, see
#4
below).
h)
Turn off the Blower Door fan. If you are using Cruise Control, this is done by pressing the
Stop Fan (Clear)
button).
4.
“-----” or “LO” appearing on Channel B
Whenever “
-----
” or “
LO
” appears on
Channel B
in the
PR/ FL @ 50
Mode, the DG-700 can not calculate a reliable
leakage estimate. The messages “
-----
” and “
LO
” appear on
Channel B
under the following three conditions:
a)
“
-----
” is continuously displayed when the building test pressure from
Channel A
is below a minimum value of
10 Pascals. Estimating building leakage results when the test pressure is below this value may result in large errors. If
possible, install a larger Flow Ring or remove the Flow Rings to generate more fan flow.
b)
“
LO
” is continuously displayed when there is negligible air flow through the test device.
c)
“
LO
” alternates with a flow reading when the air flow reading through the device is unreliable (i.e. you are
trying to measure a flow outside of the calibrated range of the test device in its current configuration). If possible, you
should change the test device configuration to match the flow rate being measured (e.g. install a Flow Ring or a
smaller Flow Ring). Be sure the fan is off when changing Flow Rings.
Note:
If you change the Flow Rings on the fan, be sure to change the Configuration setting on the gauge to match the
installed Ring.
Fan Configuration
Flow Range (cfm)
for Model 3 Fan
Open (no Flow Ring)
6,300 - 2,435
Ring A
2,800 - 915
Ring B
1,100 - 300
Ring C
330 - 85
27
Operating Instructions
for the DG700
