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Description
AA-A2… differential pressure switches
are field adjustable, compact pressure
switches for automatic burner controls.
Available with hose or NPT threaded
connections.
AA-A2-4… differential pressure switches
are suitable for making and/or breaking
a circuit when the medium pressure
changes relative to the set point. AA-A2-
4… versions feature hose connections.
AA-A2-6… differential pressure switches
are suitable for making and/or breaking
a circuit when the medium pressure
changes relative to the set point. AA-A2-
6… versions feature NPT threaded con-
nections that also include a test button
in the lower housing.
Differential pressure switch
for air, flue and exhaust gases
AA-A2…
AA-A2 Sales Brochure• P/N 226 358 • Ed. 01/09
Approvals
UL Listed
• UL 353
• File # MH 16628
CSA Certified
• CSA C22.2 No. 14
• File # 201527
FM Approved
• Class 3510, 3530
• File # J.I. 0D6A1.AF
Commonwealth of Massachusetts
Approved Product
• Approval code G3-0106-191
• Air pressure switch for differential,
vacuum or pressure
Codes and Standards
This product is recommended for in-
stallations covered by but not limited
to NFPA 85, NFPA 86, ANSI Z83.4/
CSA 3.7, ANSI Z83.18/CSA 4.9, ANSI
Z21.13, CSD-1, UL 795, CSA B149.1,
or CSA B149.3.
DUNGS is an ISO 9001
manufacturing facility.
Application
Differential pressure monitoring in ring,
ventilation and air-conditioning systems.
The AA-A2… can be used as a pressure,
vacuum or differential pressure switch for
air and non-aggressive gases. Not suit-
able for natural gas, propane, butane and
other combustable gases.
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