SeaLand VHT Vacuum Holding Tank - Manual (Page 8)

8
Cleaning, winterizing SeaLand Vacuum Holding Tank
8 Cleaning and winterizing
8.1 Cleaning
A small amount of water remains in vacuum holding tank at all times, so it is good practice to rinse the
VHT completely after contents have been discharged .
1. After initial pump-out, add holding tank deodorant or cleaner to toilet bowl, and flush with water.
2. Continue flushing and pumping out tank until holding tank discharge is clear.
8.2 Winterizing
Use only propylene glycol freshwater antifreeze to winterize the holding tank. Make sure the
antifreeze does not contain alcohol.
1 . Pump out the holding tank .
2. Thoroughly flush system with fresh water before adding propylene glycol freshwater antifreeze to
the holding tank .
Caution!
Never use ethylene glycol automotive antifreeze in freshwater systems .
9 Troubleshooting
Problem Possible Cause Service Instruction
1 . Vacuum pump running too much
between flushes.
a . Flush ball in toilet leaks .
b . Vacuum line leak .
c . Foreign material has fouled
vacuum pump valves .
d . Pump diaphragm worn or
damaged .
e. Duckbill valve in discharge fitting
stuck open .
a . Refer to VacuFlush toilet manual
for information .
b . Tighten all hose connections at
vacuum holding tank and toilet .
c. Disassemble vacuum pump and
inspect under the two flat disk
valves . If foreign material is
present, remove it and
reassemble pump .
d . Inspect diaphragm in pump
for small hole or rip . Replace if
necessary .
e. Disassemble discharge outlet
and inspect duckbill valve . Clean
or repair if necessary .
2. Toilet will not flush (no vacuum). a . Vacuum pump will not run .
b . Plugged vacuum discharge line .
c . Plugged vacuum pump valve .
d . Vacuum pump discharge or
intake lines plugged .
a . See problem 3 .
b . Blockage usually at base of toilet
below flush ball. Disconnect line
and clear .
c . Inspect and clean pump valves .
Replace if needed .
d. Disassemble lines and clean.