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Types 912H, N, Y200H, N, and R922N
2
912H 1/4 1/4 or 3/8 High Pressure Drilled and Screened 350 000
Y200H 1/4 3/8 High Pressure Slot 350 000
912N 1/4 1/4 or 3/8 High or Low Pressure Drilled and Screened 350 000
Y200N 1/4 3/8 High or Low Pressure Slot 350 000
R922N 1/4. 1/2, or FEMALE POL 1/2 High or Low Pressure 3/4-inch FNPT and Screened 725 000
Make sure gas ow through the regulator is in the same
direction as the arrow on the body— ”Inlet” and “Outlet”
connections are clearly marked. The installation
should be adequately protected from vehicular trafc
and damage from other external sources. Install the
regulator so that any gas discharge through the vent or
vent assembly is over 3-feet (0,91 m) horizontally from
any building opening below the level of the discharge.
Install the regulator high enough above ground
level—at least 18-inches (457 mm) so that rain splatter
cannot freeze in the vent. Whether a protective hood
is used or not, do not install the regulator in a location
where there can be excessive water accumulation or
ice formation, such as directly beneath a downspout,
gutter, or roof line of a building.
Before installing the regulator, check for damage which
might have occurred in shipment. Also check for and
remove any dirt or foreign matter which may have
accumulated in the regulator body or pipeline. Apply
pipe compound to the male threads of the pipe.
A hood or encasement should be used to protect the
Type Y200H or Y200N vent opening from the elements.
The regulator vent opening should slope down
sufciently to allow any condensate to drain that may
have collected in the spring case. Be careful that the slot
in the hood for the regulator outlet piping does not extend
too far and expose the vent to the elements.
The Types 912H, 912N, and R922N can be installed
outdoors without a protective hood if their vent is
pointed verticaIly down.
Horizontally mounted regulators, such as found on
single cylinder or tank installations, must be installed
beneath a protective cover. If possible, slope or turn
the vent down sufciently to allow any condensation to
drain out of the spring case. Be careful that the slot in
the hood or cover for the regulator’s outlet piping does
not extend too far and expose the vent to the elements.
Regulators installed indoors are limited to 20 psig
(1,4 bar) maximum inlet pressure. Types Y200H,
Y200N, and most 912s must not be used on indoor
installations because a vent line to the outside of the
building cannot be installed. On regulators that have
a tapped vent (Type R922N and some 912s), use pipe
or tubing equal in size to the regulator’s vent for the
vent line.
To install the vent line, remove the vent screen and
apply a good grade of pipe dope to the male threads of
the line, see Figure 2. Vent piping or tubing must not
restrict the ow passage of the regulator’s internal relief
valve. A vent assembly, such as Fisher
®
Type Y602,
should be used on the end of the vent line. The same
Figure 2. Typical Indoor Installation with
Vent Line and Vent Assembly
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