THOR Jayco Precept 2021, Owner'S Manual

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Section 8: Plumbing System
12-Volt Water Pump and Switch
There must be sufficient 12-volt DC power to run the water pump when your recreation
vehicle is not hooked up to city water. Once activated, the water pump (also known as the
demand pump) will self-prime, and provide water. The pump is designed for intermittent
use only. Using the pump continuously or with high pressure will shorten the life of the
pump and is not covered in your warranty.
Periodically check the in-line water pump strainer for accumulated debris. To clean, shut
off the water pump, unscrew the clear cap, remove the re-useable metal strainer, clear any
debris, then reinstall.
For additional information on the care and operation of the pump, read the safety and operat-
ing information in the pump manufacturer’s owner’s manual.
Water Pump Switch (if so equipped)
Most water pump switches illuminate when the water pump is activated. In most models,
the red pump switch is located on the monitor panel or the utility center. When the water
pump switch is ON the pump runs until 45 lbs. of pressure has been achieved. The red light
will stay on. The water pump automatically recycles when pressure drops. Some cycling
may occur depending on the volume of water being released. Turn the water pump switch
OFF when it is not in use.
The water pump switch should be in the OFF
position when the RV is left unattended for any
amount of time. If something would happen to the
water system, this may help limit water damage to
a smaller area.
NOTE: In some models the water pump switch will be a black rocker
switch located near the sink cabinet
Water Purification System (if so equipped)
 If the water supply has not been used for some time, allow the water to flow for
several minutes to flush the system.
 Filters should be replaced at the beginning of each camping season or if they
have come into contact with contaminated water.
 When not in use, the water filter cartridge should be stored out of freezing tem -
peratures. RV antifreeze will damage the water filter cartridge.
 Filter canister is typically located in a compartment behind the utility center.
To Replace Canister Filter Cartridge
1. Turn off water supply using two valves located on the water lines on each side of the
canister. Water pump should be OFF.
2. Place drip pan below filter housing to catch any spillage.
3. Press the red button on top of the filter housing to release pressure.
4. Using a spanner wrench, rotate the filter housing. Unscrew the housing completely,
dump water out and remove the filter (dispose of the old filter properly).
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