DMK-1 Installation Guide
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3.4
Pressure Differential Testing
WARNING
A pressure differential test is required to ensure proper operation of the DMK-1. This
test requires the use of an Analog or Digital Manometer. The differential pressure
should measure at least 0.01 inches of water and no more than 1.11 inches of water.
3.4.1
Follow the manometer instruction manual for proper setup
3.4.2
Verify and note the current manometer reading and adjust if necessary
3.4.3
With the DMK-1 cover removed, plug the manometer, positive (+) end or HIGH end into the sampling tube
end and the Negative (-) or LOW end into the exhaust tube end
3.4.4
To verify sufficient pressure differential, turn the air handler on and use the manometer to measure the
differential pressure between the two sampling tubes. The differential pressure should measure at least
0.01 inches of water and no more than 1.11 inches of water.
Check the following if the differential pressure measurements are outside of the specified range:
•
Ensure that the air velocity in the duct is within the specified range. If necessary, use a velocity meter to
check the air velocity in the duct.
•
Verify the sampling tube is installed with the air inlet holes facing into the airflow. Note that the
sampling tube and exhaust tube can be mounted in either housing connection if the exhaust tube is
mounted downstream from the sampling tube.
•
Verify that the end cap is installed at the end of the sampling tube.
•
Verify that the sampling tube extends to a minimum of 2/3 duct width.
•
Verify that the DMK-1 is properly sealed to the duct.
Negative (-)
or LOW
Positive (+)
or HIGH
Negative (-)
Positive (+)
