Installation Guide
31
Underground Installations
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 conrm 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 dierent
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 mate-
rial that could corrode the piping be protected from corrosion. Piping installed beneath
(underground) or within the slab of a building must be encased in a non-metallic water-
tight conduit that is vented. Fittings and couplings are not permitted when HOME-FLEX® is
installed underground.
HOME-FLEX® should never be buried directly underground without a conduit. To route
HOME-FLEX® tubing underground, it must be protected within a non-metallic water-tight
conduit that is at least ½" larger than the outer diameter of the CSST tubing. Fittings and
joints are not permissible in such runs; the run must be one unbroken line of tubing. Runs
underneath slabs must be sleeved and vented per local codes. (See Figures 4.7 and 4.8)
Note: If installed underneath mobile homes or in crawl spaces, HOME-FLEX® should be
installed in accordance with Section 4.3, Outdoor Installation Issues.
4.10 Electrical Bonding
Proper bonding and grounding may reduce the risk of damage and re from electrical arcing
to CSST as a result of a lightning strike. Lightning does not have to strike a structure directly
to cause damage. Conductive systems, like piping or wiring, can become energized indirectly
by a lightning strike. When systems are not properly bonded, the current from the energized
line can cause electricity to arc (or jump) from one system to another and damage the CSST.
Proper adherence to the bonding instructions should lower the risk of electrical arcing and
related damages.
Bonding Guidelines
In accordance NFPA 54 Section 7.13, Valencia Pipe Company requires proper bonding
of HOME-FLEX® gas piping to the electrical grounding system of any structure in which
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