LP-Gas Systems ---
Section 7
Cayman 2005
243
LP-GAS REGULATOR
LP-Gas is compressed into liquid form in
the tank. Only the vapor is used during com-
bustion by an appliance. As vapor is removed
from the tank, the remaining liquid will
vaporize to maintain pressure that is removed
during consumption. This process will con-
tinue until there is no liquid remaining in the
tank.
Temperature affects the vaporizing action
of the liquid. If temperature of the liquid is -
44º F, the liquid remains stable with tank
pressure, about 0 psi. If liquid temperature is
100º F, the liquid quickly vaporizes with tank
pressure, about 200 psi. Vapor pressure must
remain relatively consistent, regardless of
temperature, for the appliance heat output to
remain stable. Vapor pressure regulation is
performed by the regulator.
The motorhome two-stage regulator reduces vapor pressure so that it is safe for use. The first stage
of the regulator reduces tank pressure to a range of 10 to 13 psig (pounds per square inch gauge). The
second stage further reduces pressure to a working pressure of 0.4 psig (11 Inches of Water Column or
about 6¼ ounces psi.). A vent is installed to allow the internal diaphragm to move with atmospheric
pressure change. It is important to keep the vent clean and clear of obstruction or corrosion. If the vent
becomes clogged, pressure from LP tank may cause erratic pressure regulation. If there is any corrosion,
contact a qualified LP-Gas service technician. The regulator is mounted so that the vent faces down-
ward. If the vent becomes clogged, clean it with a toothbrush.
Under normal atmospheric conditions an LP-Gas regulator will not freeze, nor will the LP-Gas.
Vapor passing through the regulator will expand and cool, condensing moisture in the gas. The mois-
ture will freeze, build up and block the vent. The possibility of freeze up is greatly reduced with the
two-stage regulator.
To Prevent Freeze Up:
• Ensure the LP-Gas tank is totally free of moisture prior to filling.
• Ensure the tank is not overfilled.
• Keep the valve closed when the tank is empty.
If A Freeze Up Occurs:
• Have an LP-Gas distributor purge the tank.
• Have the LP-Gas distributor inject methyl alcohol in the tank.
050251
Typical Two-Stage Regulator
Summary of Contents for Cayman 2005
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Page 76: ...Section 2 Driving Safety Cayman 2005 76 100179D Weight Label...
Page 81: ...Driving Safety Section 2 Cayman 2005 81 020254 Cargo Carrying Capacity Flowchart...
Page 83: ...Driving Safety Section 2 Cayman 2005 83 020255k Actual Worksheet...
Page 84: ...Section 2 Driving Safety Cayman 2005 84 Weight Record Sheet...
Page 85: ...Driving Safety Section 2 Cayman 2005 85...
Page 86: ...Section 2 Driving Safety Cayman 2005 86 010725 010726c VIEWS Front Rear...
Page 87: ...Driving Safety Section 2 Cayman 2005 87 010723f 010724e Roadside Curbside...
Page 95: ...Driving Safety Section 2 Cayman 2005 95 NOTES...
Page 96: ...Section 2 Driving Safety Cayman 2005 96 NOTES...
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Page 108: ...Section 3 Exterior Interior Care Cayman 2005 108 Fabric Specifications Charts...
Page 109: ...Exterior Interior Care Section 3 Cayman 2005 109...
Page 134: ...Section 3 Exterior Interior Care Cayman 2005 134 NOTES...
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Page 165: ...Appliances Section 4 Cayman 2005 165 NOTES...
Page 166: ...Section 4 Appliances Cayman 2005 166 NOTES...
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Page 203: ...Equipment Section 5 Cayman 2005 203 NOTES...
Page 204: ...Section 5 Equipment Cayman 2005 204 NOTES...
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Page 229: ...Water Systems Section 6 Cayman 2005 229 WATER SYSTEM DIAGRAM 040487c Typical Layout...
Page 230: ...Section 6 Water Systems Cayman 2005 230 NOTES...
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Page 250: ...Section 7 LP Gas Systems Cayman 2005 250 NOTES...
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Page 286: ...Section 8 Electrical Systems House Cayman 2005 286 NOTES...
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Page 292: ...Section 9 Electrical Systems Chassis Cayman 2005 292 080427f 080387C 080388c...
Page 315: ...Electrical Systems Chassis Section 9 Cayman 2005 315 ENGINE NO START FLOW CHART...
Page 316: ...Section 9 Electrical Systems Chassis Cayman 2005 316 NOTES...
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Page 376: ...Section 10 Chassis Information Cayman 2005 376 LUBRICATION CHARTS 070166G FRONT...
Page 382: ...Section 10 Chassis Information Cayman 2005 382 METRIC U S CONVERSION CHART...
Page 384: ...Section 10 Chassis Information Cayman 2005 384...
Page 385: ...Chassis Information Section 10 Cayman 2005 385...
Page 386: ...Section 10 Chassis Information Cayman 2005 386...
Page 387: ...Chassis Information Section 10 Cayman 2005 387...
Page 389: ...Cayman 2005 INdex...
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