Appendix A
Quick Guides for Using the DG-700 with Energy Conservatory Test Devices
A.3 Using the TrueFlow
Air Handler Flow Meter and the DG-700 Digital Gauge
1.
Measure the Normal System Operating Pressure (NSOP) with the existing filter in place.
a)
Locate the air handler system filter and replace if it is dirty.
b)
Install a static pressure probe into the ductwork at one of the 3 locations listed below:
•
Insert the static pressure probe into the side surface of the supply plenum. The side of the supply plenum
chosen should not have a trunk line, distribution duct or supply register connected to it. The static pressure
probe should point into the airstream.
•
Or, insert the tip of the static pressure probe into a "dead-end" corner of the supply plenum. A "dead-end"
corner is a corner of the plenum that does not have a trunk line connection, distribution duct connection or
supply register within 8 inches of the corner.
•
Or, insert the static pressure probe in the side surface of the return plenum. The side of the return plenum
chosen should not have a trunk line, return duct or return register connected to it. The location chosen
should also be at least 24 inches upstream from the TrueFlow Metering Plate, and at least 24 inches
downstream from any 90 degree corners or return trunk line connections. The static pressure probe should
point into the airstream.
Note:
if the Metering Plate will be installed at a remote filter grille, the static
pressure probe may not be installed in the return plenum (i.e. install it in the supply plenum).
c)
Connect a piece of tubing between the static pressure probe and the
Channel A
Input
tap. If the gauge is in the
house during the test procedure, leave the
Reference
tap on
Channel A
open. If the gauge is not in the house during
the test procedure (e.g. attic, crawlspace), run additional tubing from the
Channel A Reference
tap to inside the
house.
d)
Turn on the air handler fan to the desired speed. Now turn on the gauge and put it the
PR/ AH
mode by pressing
the
MODE
button 4 times. The icon “
NSOP
” will begin to flash in the
Channel A
display. At this point, the gauge is
monitoring the real-time
Channel A
NSOP
pressure, but is not recording the reading. The
Channel B
display is not
active at this time.
e)
Press the
START
button to begin the
NSOP
measurement
procedure on
Channel A
. Once the
START
button is pressed, the
NSOP
icon stops flashing and the gauge begins recording a long
term average
NSOP
pressure reading on
Channel A
. During the
measurement procedure, the
Channel B
display is used as a timer to
let the user know how long (in seconds) the
NSOP
measurement has
been active. The longer the measurement time, generally the more
stable the reading typically becomes. In the screen to the right, the measured
NSOP
pressure is 56.7 Pascals
(measured over the past 30 seconds).
f)
Once you are satisfied with the
NSOP
reading, press the
ENTER
key to accept and enter the reading into the
gauge. Turn off the air handler fan, and leave the static pressure probe in place and connected to the gauge on
Channel A
.
2.
Install the TrueFlow Metering Plate in an Existing Filter Slot.
a)
Remove the existing filter and set it aside.
b)
Choose and assemble the metering plate and spacers needed to match the filter slot size.
Filter Slot
(in. x in.)
Flow Metering Plate Spacer Dimension
(in. x in.)
Spacer 1
Spacer 2
14 x 20
#14
------
------
14 x 25
#14
5 x 14
------
16 x 20
#14
2 x 20
------
16 x 24
#14
2 x 20
4 x 16
16 x 25
#14
2 x 20
5 x16
18 x 20
#14
4 x 20
------
20 x 20
#20
------
------
20 x 22
#20
2 x 20
------
20 x 24
#20
4 x 20
------
20 x 25
#20
5 x 20
------
20 x 30
#20
10 x 20
------
24 x 24
#20
4 x 20
4 x 24
30
Operating Instructions
for the DG700
