Appendix A
Quick Guides for Using the DG-700 with Energy Conservatory Test Devices
c)
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 Series B Duct Blaster fan is
DB B
, and the Configuration icon for Ring 2 is
B2
. Press the
DEVICE
button to change the selected fan. Press the
CONFIG
button to change the selected Flow Ring.
d)
Turn on the Duct Blaster fan.
If Using Cruise Control:
Turn the Duct Blaster speed controller to the “just on” position (i.e. turn the controller knob all the way down
counter-clockwise and flip the on/off switch to “ON” – the fan will not be turning). Now press the
Begin Cruise
(Enter)
button. The
Channel A
display will now show the number 25 (your target Cruise pressure). Press the
Start Fan (Start)
button. The Duct Blaster fan will now slowly increase speed until the duct pressurization
displayed on Channel A is approximately 25 Pascals.
If Manually Controlling Fan:
Turn on the Duct Blaster fan controller and slowly turn the fan controller knob clockwise. As the fan speed
increases, the duct pressurization displayed on
Channel A
should also increase. Continue to increase the fan
speed until the duct pressurization shown on
Channel A
is between 20 and 30 Pascals. Do not waste time
adjusting and re-adjusting the fan speed control to achieve a test pressure of exactly 25 Pascals.
e)
Channel B
will now display the One-Point 25 Pascal Total Duct Leakage estimate. 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
#5
below).
5.
“-----” or “LO” appearing on Channel B
Whenever “
-----
” or “
LO
” appears on
Channel B
in the
PR/ FL @ 25
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 duct test pressure from
Channel A
is below a minimum value of 5
Pascals. Estimating duct 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 Ring on the fan, be sure to change the Configuration setting on the gauge to match the
installed Ring.
29
Operating Instructions
for the DG700
Содержание DG-700
Страница 1: ...Operating Instructions for the DG 700 Pressure and Flow Gauge...
Страница 2: ......
