3. The return duct is recommended, however, the switch can also be mounted to the supply duct.
Fig. 9. Mounting the pressure switch.
SUPPLY DUCT INSTALL – AIRLINE ONLY TO TAP A, CONNECTED TO THE + PORT ON THE AIRFLOW SWITCH
RETURN DUCT INSTALL – AIRLINE ONLY TO TAP B, CONNECTED TO THE – PORT ON THE AIRFLOW SWITCH
SUPPLY/RETURN DUCT INSTALL – AIRLINE CONNECTED TO BOTH THE + AND – PORTS ON THE AIRFLOW SWITCH
M27303
4. Cut a 3/4-in. diameter hole in the duct within 10 feet of the switch to ensure the provided tubing reaches the pressure tap elbow.
5. Insert the black rubber gasket into the duct hole.
6. Connect the tubing to the tubing fitting elbow and insert the tubing fitting elbow into the black rubber gasket.
7. Connect the other end of the tubing to the applicable pressure connection on the switch.
e. Black connection if installed on the supply
f. Grey connection if installed on the return
g. Both grey and black if installed on both
IMPORTANT
With low-speed airflow or variable speed systems it is recommended to run tubing to both the supply and return ducts.
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