During cold weather, it is important to keep ice from forming in the regulator, which will shut
off the flow of LP Gas to the appliances. Have the supplier add a hydrous Methanol when
filling the tank for use during cold weather. Regulator freeze-up can occur in any weather if
there is moisture in the tank, or if the tank has been over-filled. Always use moisture-free LP
Gas, and make sure the tank has not been filled beyond 80% of capacity. If moisture has
entered the tank, have the tank purged, or have hydrous methanol added by an authorized
LP supplier.
If you believe a regulator has been damaged or otherwise is not functioning, have it replaced
by a qualified LP Gas service representative.
WARNING: Never alter the positioning of the regulator. LP Gas regulators
must always be installed with the diaphragm vent facing downward. Also
make sure to keep the regulator cover in place to minimize vent blockage
which could result in excessive gas pressure causing fire or explosion. Do not
rely upon being able to smell LP Gas leaks, as the odor may not be
sufficiently strong to detect.
REGULATOR FREEZE-UP
The term regulator freeze-up is a misleading one. Regulators and LP Gas do not freeze.
However, the moisture that can be contained in the gas will freeze as the gas expands and
cools passing through the regulator. This freezing of the moisture in the gas can build up and
partially or totally block the passage of the gas through the regulator. Freezing can also occur
when outside temperatures are low enough to contribute to the freezing of the moisture in the
gas.
The source of the moisture is varied. It can occur at the refinery or gas bulk plant, in the rail
cars used to transport the gas, or even within the motorhome LP tank. Moisture in an LP tank
can occur when a tank service valve is left open, allowing moist air to enter and become
trapped.
A two-staged regulator helps to reduce the possibility of freeze-up because of its larger orifice
size, and the fact that heat is transferred through the walls of two regulators instead of just
one.
There are several steps that can be taken to inhibit or prevent this from happening:
1. Make sure that the LP tank is free of moisture before refilling.
2. DO NOT overfill the LP tank.
3. Make sure to keep the service valve on an empty tank closed.
4. If freezing has occurred, have your LP dealer purge the LP tank before refilling.
5. Add a hydrous methanol or other approved LP antifreeze or de-icing agent to the LP
tank.
6. Keep the regulator covered at all times.
9-4
LP GAS SYSTEMS
2005 PRESIDIO
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