(06/06)
STEA SERIES
Installation, Operation & Maintenance Manual
19
PC-301 Air Proving Switch
Mounting the PC-301 air flow switch:
Mount the airflow switch in the supply or return duct using the
screws supplied. Mount the device so that the diaphragm is in a
vertical position as shown at right.
If the airflow switch is to be mounted on the return duct (vacuum),
then mount it in a vertical position by the small plate. Drill a 7/16"
hole in the side of the duct and connect the supplied tubing to
the low pressure tap on the airflow switch and then run it through
the drilled hole in the duct. Put no more than 2" of tubing into the
duct. Caulk around the tubing where it enters the duct. The high
pressure tap is left open to atmosphere.
If the airflow switch is to be mounted to the supply duct (pres-
sure), then simply drill a 7/16 hole in the side of the duct, apply caulking to the large plate, and mount the device
with the large plate to the duct and the high pressure tap/tubing mated the hole. The low pressure tap is left open
to atmosphere.
MOUNTING DIAGRAMS
Vac Full
Load
Amps
Locked Rotor
Amps
Pilot Duty
(VA)
Non-
Inductive
Amps
24V -
-
60
10
120V 6.25
37.5
300
10
240V 3.1
18.6
300
10
277V 2.7
16.2
300
10
N.C.
Common Increase
Pressure
N.O. makes on increase N.O.
in pressure.
TABLE 1. MAXIMUM ELECTRICAL SWITCH RATINGS
WIRING DIAGRAM