Dwyer A-420 - Manual (Page 2)

20596_ins_Dwyer_A420
Installation & Operation Instructions
Outdoor Air Static Pressure Pickup Port
Dwyer Instruments Inc., 102 Indiana Hwy. 212, Michigan City, IN 46361 USA
Tel: 800/872-9141 or 219/879-8000 • Fax: 219/872-9057 • E-mail: [email protected] • Web: www.dwyer-inst.com
4/23/08 rev.
2
Specifications subject to change without notice.
Preferred Mounting
Figure 2: Preferred Mounting,
1/2” EMT Conduit Mounting Support
Figure 3: Wall Mounting,
1/2” EMT Conduit Mounting Support
Figure 2 shows the Outdoor Air Static Pressure Pickup Port mounted on an RTU or air handler. A mounting support is field
fabricated from a piece of 1/2-inch EMT conduit bent to 90 degrees as shown. The short leg mounts the Outdoor Air Static
Pressure Pickup Port. The long leg mounts the assembly to the side of the mechanical equipment. The length of the long
leg is dependent upon your installation site, just be sure that the Outdoor Air Static Pressure Sensor is at least 12 inches
above the top of the equipment. If you are mounting on mechanical equipment with a condenser fan or a building air
discharge, mount the Outdoor Air Static Pressure Pickup Port on the opposite end of the equipment. It is best to mount
the Outdoor Air Static Pressure Pickup Port to the compartment that contains the controls; usually there is a hole in the
compartment into the building envelope for control wiring.
Drill two holes in the sheet metal for the EMT conduit support brackets. Bolt the EMT conduit mounting support to the side
of the equipment. Place enough tubing on the Outdoor Air Static Pressure Pickup Port’s barbed fitting to reach beyond the
end of the EMT conduit mounting support. Slide the tubing down the inside of the EMT conduit and slide the Outdoor Air
Static Pressure Pickup Port’s conduit fitting onto the EMT conduit. Position the Outdoor Air Static Pressure Pickup Port
with the plate down and parallel to the earths surface. Tighten the Outdoor Air Static Pressure Pickup Port’s conduit fitting’s
screw until the unit is secure on the EMT mounting support.
Drill a 5/16-inch hole in the sheet metal near the bottom of the EMT conduit mounting support for the bulkhead fitting.
Place the fitting through the sheet metal from the outside so that the nut is on the inside, tighten the nut securely but do
not over tighten. Place the tubing coming out the bottom on the EMT conduit mounting support onto the bulkhead fitting.
Place up to 150 feet of tubing on the bulkhead fitting’s inside port and run the tubing into the building to your pressure
transducer.