Installation Guide

36
Installation Practices
• Where a gas line pressure regulator is used in a system with a source pressure in
excess of 2 PSI to serve appliances rated for 1/2 PSI or less, a regulator with an inte-
grated over-pressure protection device (OPD) must be used. The regulator with
OPD must be assembled and listed by the regulator manufacturer in accordance
with ANSI Z21.80, Standard for Line Pressure Regulators.
Note: The regulator models specied above are provided for reference only. They are not
distributed, warranted, or supported by Valencia Pipe Company.
Vent Limiters and Vent Lines
Regulators must be equipped with a manufacturer-supplied vent limiting device, or be capa-
ble of being vented outdoors. When installed indoors, the vent-limiting device is to be used.
When a vent-limiter is used, the regulator must be mounted in an upright position for proper
function. For outdoor venting, the vent line must be at least the same size as the regulator
vent connection and not exceed a length of 30 feet. The vent must be designed to prevent
entry of water or other foreign materials that could clog the line. DO NOT vent to an appliance
ue, building exhaust system, or pilot light.
If installing the regulator outdoors, remove the vent limiter and mount the regulator with the
vent outlet pointing toward the ground to prevent water from entering. If the manufacturer
provides a cap for outdoor installations, this can be used and the regulator can be mounted
right side up.
Gas line regulators do not vent gas under normal operating conditions. A regulator that is
venting gas should be replaced immediately.
Performance Testing
A performance test of the regulator should be conducted to conrm that adequate pres-
sure reaches all appliances. During the test, all appliances should be running at full load to
make sure that adequate pressure is maintained under full-load conditions for the gas piping
system. The inlet pressure for gas appliances should be equal to, but not greater than, the
appliance's recommended inlet pressure range. If the pressure is not within this range, adjust-
ments to the service regulator or the pounds-to-inches gas line regulator may be required to
adjust line pressure.
Regulator Adjustments
Regulators can be adjusted to deliver dierent
outlet pressures downstream of the regulator.
To adjust a regulator, remove the seal cap to
expose the adjusting screw. Turn the screw
clockwise to increase outlet pressure, or
counter-clockwise to decrease pressure. (Fig-
ure 4.26)
If the spring adjustment doesn’t result in the
desired pressure, make sure the supply pressure is at least equal to the desired outlet pressure
plus the pressure drop of the regulator. If this pressure is adequate, contact to the manufac-
turer. DO NOT continue to turn the screw clockwise if the outlet pressure reading doesn’t
increase as this may result in over-ring should there be an increase in inlet pressure.
4.9 Underground Installations
Building codes require that gas piping runs that come in contact with earth or other material
that could corrode the piping be protected from corrosion. Piping installed beneath (under-
ground) or within the slab of a building must be encased in a nonmetallic water-tight conduit
that is vented. Fittings and couplings are not permitted when HOME-FLEX® is installed under-
ground.
Figure 4.26 Pressure Regulator Diagram
Gas
Flow
Spring
Cover
Closing Nut
Adjusting Screw
Vent Limiter
Diaphragm
Appliance
Pressure
Body
Balancing
Seat
Gas Pressure Pushes up
Pushes downSpring