THOR Jayco Precept 2021, Owner'S Manual

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Section 8: Plumbing System
6. Close the black tank dump valve, and then close the
macerator bypass valve.
7. Open the gray tank dump valve, and then open the
macerator bypass valve.
8. When finished, make sure both black and gray tank
dump valves are closed, shut off the macerator by -
pass valve, and disconnect the sewer hose from under
the motorhome and at the dump station.
9. Clean and store the sewer hose.
10. Replace the dust cap on the macerator bypass.
The black tank flush inlet can be used with the macerator bypass (refer to the Black Tank
Flush
section).Contact your RV dealer for assistance in the purchase and installation of a
sewer hose and/or sewer hose extension (if needed).
Black Tank Flush (if so equipped)
The black tank flush inlet is typically located on the utility center pan -
el. The location may vary depending on your model. The inlet color
may be either white or black. Attach a garden hose connected to a
pressurized fresh water source to the black tank flush inlet. The water
goes directly into the black water holding tank sprayer connection,
allowing you to remove debris and preventing accumulation. There
is a check valve in the plumbing lines to prevent back flow.Flush the
black water tank each time the grey and black water holding tanks are
dumped or as needed.
1. Dump the black water tank (see Gray Tank Drain & Black Tank
Drain) and leave the black tank drain valve open.
2. Connect a garden hose from the water supply source to the black
tank flush.
3. With the water source turned ON, flush the black water holding tank until the water
running out of the black tank drain valve is clear (not discolored or cloudy).
4. Disconnect the garden hose and close the black tank drain valve. Fasten the sewer hose
housing dust cap back on the tank flush inlet.
Tank Flush Inlet
Do not use the same hose to fill your fresh (potable) water tank that is used for
the black tank flush.
 The black tank drain valve must be OPEN any time there is a hose (water
supply) connected to the black tank flush.
 Do not leave any hose (water supply) connected to the black tank flush
when it is not in use.
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