How to Winterize Your Coach
When to Winterize Your Coach
Although great care has been taken to build a well-insulated unit, recreational vehicles are not intended for extended
use in sub-freezing weather without special precautions. When the outside temperature drops below freezing, the
furnace must be turned on to keep the coach warm. Continued use in cold weather will require the coach to be
winterized.
It is critical to winterize the plumbing in your coach when storing it in temperatures below freezing or using it in extremely
cold conditions. If subjected to these conditions without being properly winterized, the heating system may be unable to
keep the coach and its compartments above freezing temperatures.
Winterizing is the responsibility of the consumer. Make sure you have protected the complete water system
any time your coach is in freezing temperatures. Failure to complete the winterization process may result in
extensive damage to the water system, appliances, and coach.
A regulated compressed air supply is needed to properly complete this procedure. The pressure should be
regulated between 40 and 60 PSI (pounds per square inch). Higher pressures may cause damage.
How to Winterize Your Coach
1. Drain the black and grey tanks. If equipped, also empty the macerator hose.
2. Drain the Fresh Water Tank. Open the tank drain valve located in the driver side water bay.
3. Turn off the switch(es) to the water heater or the hydronic heating system, including the burner and the 120
Volt element, depending on your coach's equipment.
4. Turn on the refrigerator.
5. While the tank is draining, remove all of the water filters. Install a bypass or the filter canister, including the
whole house, refrigerator, and drink water filters (whether standard or UV), if your coach is equipped.
6. For units with a water heater instead of a hydronic heater, close the valves to the water heater, and open the
bypass valve, which is normally located at the back side of the water heater.
7. Remove the drain plug at the bottom of the water heater tank on the exterior of the coach.
The 120 Volt water heater element must be turned off by flipping the switch near the water heater's drain plug.
8. Open the low point drains by turning the valve to the "open" position or by pulling up on the handle if the coach
is equipped with T-Handle valves. There should be one drain for hot and one for cold, and they are normally
located in the water compartment.
9. Connect the regulated air supply to the inlet of the hose from the hose reel (if equipped) or the city water fill
inlet. Air will flow out of the low point drains.
10. Cycle the auto fill or tank fill valve (whichever the coach is equipped with) to all possible positions for a
minimum of 10 seconds at each position.
11. Close the low point drains. This must be done prior to pumping antifreeze through the lines, or the antifreeze
will be pumped onto the ground.
12. Remove the whole house filter canister, and dump any remaining water, and reinstall.
13. Locate the winterizing valves marked "A" & "B" located in the water compartment.
14. Close valve "A" by rotating the valve clockwise. Open valve "B" by rotating the valve counter clockwise.
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