10 ModVans CV1 Owner’s Manual V1.1
Avoid leaving water in the tank when the motor home is not in use. Whenever possible, drain the fresh
water tank before traveling. Water in the tank will reduce the carrying capacity of your RV by
approximately 8 lbs. per gallon.
Draining the Fresh Water System
To drain the fresh water system:
1. On the Control Panel, ensure that the Water Pump switch is On.
2. Open the hot water temperature pressure relief (TPR) valve and the cold water drain valve,
which are located under the RV on the front corner of the furnace box on the driver’s side near
the shore power inlet
3. Open all faucets and water tank fill doors, including the shower if equipped
4. Allow the system to drain completely
5. Turn off the water pump as soon as water stops coming out of the drain valves.
6. Close all valves, faucets, and fill doors
Water System Sanitization
To discourage the growth of bacteria and other organisms that can contaminate the fresh water system,
sanitize the fresh water tank and plumbing approximately every 3 months or whenever the RV has been
stored for a prolonged period. Use a chlorine (bleach)/fresh water rinse as follows:
1. For the standard 25 gallon tank, prepare a solution of ½ cup household liquid chlorine bleach
(5% sodium hypochlorite) in 2 gallons of water. Make sure to use “regular” bleach without any
added fragrances or other chemicals.
2. Close all drain valves and faucets, pour solution into fresh water tank, and complete filling the
tank with fresh water.
3. Turn Water Pump switch on via the Control Panel. Open all faucets individually until water flows
smoothly, then turn them off to purge air from the water system.
4. Top off water tank with fresh water, then wait 3 hours.
5. Drain the water system following the fresh water system drain procedure.
6. Flush the system with potable water. Let the fresh water flow through the complete system,
including all faucets, for several minutes to flush out the chlorine solution.
7. Close drain valves and faucets – the fresh water system is ready for use.
Cold Weather Operation
The CV1’s plumbing and optional hot water heater can be damaged by freezing water. Damage due to
freezing is NOT covered under warranty. The CV1’s water systems have some capability for running in
sub-freezing conditions. However, you do so at your own risk. Do not let your hot water heater freeze
with water in it. If you choose to run your hot water heater in sub-freezing conditions, do not allow it to
run out of propane or 12V electricity. The safest strategy for sub-freezing conditions is to completely
drain the water system, and carry water containers inside the RV.
Popup Top and Beds
The popup top is raised and lowered via a rocker switch on the Control Panel. Before raising the popup
top, it is very important that you completely release the 2 hook-and-loop straps at the front end of the
popup top. After releasing the straps, go outside and look around the RV to ensure that there are no
obstacles (trees, awnings, garage ceilings, etc.) above the popup top that could cause interference with
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