Operation - Dometic SailVac VHT 5200 Series Instruction Manual

SailVac Vacuum Holding Tank
5 . With electrical power off, make electrical connections according to the wiring schematic shown
on the parts list provided with this unit . Electrical installation must follow ABYC standards and
should be performed by qualified personnel only .
Caution!
Failure to follow the procedures above may result in vacuum leaks or inefficient flushing .
Caution – Flooding Hazard!
If the toilet, holding tank or any components are connected to any through-hull fittings,
properly installed seacocks must be installed in all piping connected to the through-hull
fittings . Seacocks must be easily accessible to all users of the system . All valves must be
full-bore valves and of marine (corrosion resistant) quality . Screw-to-close gate valves are
not recommended . Failure to do so can result in flooding, which can cause the loss of life
and property .
Caution – Flooding Hazard!
Some marine practices and/or standards require the installation of a properly positioned
ventilated (vented) loop in the discharge piping to prevent back-siphonage of seawater
into the holding tank . It is up to the system installer and boat owner to select appropriate
means of preventing backflow into the holding tank .
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Operation

7.1 System start-up
1 . Fill freshwater tank, then turn on inlet water supply to VacuFlush toilet .
2 . Turn on electrical power to vacuum holding tank (VHT) .
3 . VHT unit may take up to three minutes to initially charge vacuum level and recharge between
flushes .
7.2 Normal operation
VACUUM FLUSHING ACTION
Every time the VacuFlush toilet is flushed, the VHT unit pulls wastewater from the toilet to the holding
tank . The vacuum pump then runs until the proper vacuum level is achieved for the next flush .
Follow flushing instructions in VacuFlush toilet operation manual .
"3/4" and "FULL" TANK PROBES
When the holding tank contents activate the "3/4" tank probe, a signal is sent to a yellow warning
light on the Dometic tank monitor panel (optional) . When the tank reaches "full", a signal is sent
to the red light on the panel, and to a shutdown relay which turns off electrical power to the toilet
system . This prevents the VacuFlush toilet from flushing and overfilling the VHT . The VHT must be
emptied before electrical power is restored for normal VacuFlush toilet operation .
7.3 Holding tank pump-out operation
To assure thorough discharge of vacuum holding tank, follow these steps:
1 . Turn off electrical power to VHT at circuit breaker and water supply to VacuFlush toilet .
This prevents vacuum pump from starting during pump-out operation .
2 . For foot-pedal VacuFlush toilets with built-in pedal lock, follow instruction in toilet operation manual
to keep flush ball in toilet open for holding tank pump-out operation . For electronic VacuFlush
toilets, follow Service Mode instructions for keeping the flush ball open . For all other VacuFlush
toilets, make sure flush ball stays open to allow air into VHT unit during pump-out operation .
Installation
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