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Gxx_A2 Sales Brochure • P/N 226 359 • Edi 01/08
Gas Pressure Switch
for DMV safety shutoff valves
GAO-A2…
GMH-A2…
GML-A2…
Description
The GAO-, GMH-, and GML-A2… pres-
sure switches are compact, ventless gas
pressure switches for modular valve train
components.
A2 pressure switches are suitable for
making and/or breaking a circuit when
the medium pressure changes relative
to the set point. The set point can be
set in the eld by an adjustable dial with
an integrated scale
. The switches incor-
porate a vent limiter as per UL 353 and
limits the escape of gas less than 1.0 CFH
of natural gas at 7 PSI if internal switch
diaphragm ruptures.
Application
The GAO-, GMH-, and GML-A2… pres-
sure switches are recommended for
industrial and commercial heating ap-
plications with DMV dual modular valves,
SV safety valves, MBC multifunctional
controls, and FRI modular pressure regu-
lators. Various mounting options allow
direct mounting on the housing.
The GAO-, GMH-, and GML-A2… pres-
sure switch is suitable for natural gas,
propane, butane, air and other inert
gases. Suitable for up to 0.1% by vol-
ume, dry H
2
S.
UL Listed
• UL 353
• File # MH 16628
CSA Certified
• CSA C22.2 No. LR 53222
• File # 201527
FM Approved
• Class 3510, 3530
• File # J.I. 1Y9A9.AF
Commonwealth of Massachusetts
Approved Product
• Approval code G3-0106-191
• Gas pressure switch
Codes and Standards
This product is intended for installations
covered by but not limited to NFPA
85, NFPA 86, UL 795, CSD-1, ANSI
Z83.4, ANSI Z83.18, ANSI Z21.13,
and CSA B149.3.
DUNGS is an ISO 9001
manufacturing facility.
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