Type HSR
4
TO APPLIANCE
VENT LINE
BASEMENT
VENT
ASSEMBLY
Do not install the regulator in a location where there can be
excessive water accumulation, such as directly beneath a
downspout or in an undrained pit.
To obtain the maximum ow capacities or other performance
characteristics, the length of pipe from the regulator outlet
to the meter—or for the rst 18-inch / 457 mm, whichever is
closer—should have no bends and should be the same size
as the regulator outlet. Replace the regulator if water gets into
the spring case or the lower casing of the regulator.
HSR Series regulators have a spring case vent
(1 or 3/4 NPT) which is screened to prevent insects or
foreign material from entering.
CAUTION
You are advised to use new vent piping
because defective threads on the relief
vent piping may interfere with the venting
assembly if the piping obstructs the
movement of the vent stabilizer.
On indoor installations, the vent should be piped outside
the building, see Figure 3. Remove the screen from the
regulator vent connection and connect vent piping from
that connection to the outdoors. Vent piping should be as
large in diameter as practical, be as short as possible and
have a minimum number of bends and elbows. Install a
Table 4. Flow and Sizing Coef cients
ORIFICE SIZE WIDE-OPEN FOR RELIEF SIZING
C
1
IEC SIZING
COEFFICIENTS
Inch mm C
g
C
V
X
T
F
D
F
L
1/8 3.2 12.5 0.36
35 0.78
0.82
0.89
3/16 4.8 28.2 0.81 0.82
1/4 6.4 50 1.43 0.82
3/8 9.5 105 3.00 0.79
1/2 13 185 5.29 0.79
weather and insect resistant vent assembly on the outside
end of the pipe, such as a Type Y602. The same installation
precautions apply to vent assemblies as the integral
regulator vents described previously.
A program of regular inspection of the vent opening should
be established to see that it has not become plugged by
foreign material. On some installations, such as in areas of
heavy snowfall, it may be necessary to install the regulator
beneath a protective hood. If other protection is provided from
the elements, the vent should be pointing or sloping down
suf ciently to allow any condensate to drain. Also check the
regulator periodically for external or internal corrosion.
Overpressure Protection
WARNING
!
Some type of overpressure protection is
needed if actual inlet pressure can exceed
the outlet pressure rating. Overpressuring
any portion of this equipment above the
limits given in the Speci cations section and
Tables 1 and 2 may cause damage to regulator
parts, leaks in the regulator or personal injury
due to bursting of pressure-containing parts or
explosion of accumulated gas.
Figure 3. Typical Vent Line Installation
B2497
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