SeaLand VACUUM HOLDING TANK User Manual
VACUUM
HOLDING TANK
OWNER’S MANUAL
WARNING
!
This manual must be read and understood before installation, adjustment,
service, or maintenance is performed. Modification of this product
can result in property damage.
Dometic Corporation • Sanitation Systems
13128 State Rt 226, PO Box 38
Big Prairie, OH 44611
SeaLand Product Customer Service: 1-800-321-9886
(8:00 a.m. - 5:00 p.m. ET)
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TABLE OF CONTENTS
Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Major Components . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . 3
System Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Component Locating Procedure . . . . . . . . . . . . . . . . 4
Key Installation Points . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation of Components . . . . . . . . . . . . . . . . . . . . 5
Winterizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . 6 - 7
Dimensional Specifications . . . . . . . . . . . . . . . . . . . . 7
Manufacturer’s One-Year Limited Warranty . . . . . . . 8
PRODUCT FEATURES
The Vacuum Holding Tank (VHT) brings the
technology, comfort and efficiency of Dometic’s
renowned VacuFlush® vacuum sanitation systems to
smaller boats in an easy-to-use, and easy-to-maintain
package.
Simple Installation
• All system components are “installation ready.”
• No solvent bonding is required.
• Removable hose insert fittings make hose installation
simple.
• Vacuum pump and switch are pre-wired at factory.
• Easy to mount.
Reliability is Built-In
• No impellers or macerators. Motor can run without
burning up.
MAJOR COMPONENTS
The Vacuum Holding Tank (VHT) system consists of a
VacuFlush toilet or EcoVac™ toilet and the Model VHT
Vacuum Holding Tank. The VHT is a unique combination of the vacuum tank, vacuum pump and holding tank
components used in a standard VacuFlush toilet
system.
Each toilet series consists of several models, allowing
for a multitude of installation variations: a rear discharge
standard height unit, a bottom discharge standard height
unit, and a bottom discharge low-profile unit designed to
fit on a platform.
The vacuum toilet must be purchased separately;
it is not included with the VHT.
VACUUM HOLDING TANK (VHT)
The VHT produces and stores vacuum between flushes.
The vacuum holding tank is made of highly durable polyethylene. The pump is integrally connected with
the vacuum tank. The vacuum pump is electric and draws
only 2 to 4 amps of current at 12 VDC.
One vacuum holding tank is required for each toilet.
Two or more toilets cannot be connected to one VHT.
The VHT contains the pre-set pressure differential switch
control that turns the pump on and off when the proper
level of vacuum is created.
A unique component on the VHT is the Vacuum Relief
Valve (VRV). The VRV prevents excessive vacuum from
accumulating in the tank. The VRV is calibrated to open
at 13" of vacuum and close at 11" of vacuum. This feature is beneficial during pump-outs.
The VHT system comes equipped with a full level float
switch. This float switch is wired directly to an automatic
shutdown relay. The relay prohibits the vacuum pump
from generating vacuum once the tank is full. A full level
indicator light should be wired to the full float, by the
installer. If a full level indicator light was not installed,
order part number 318714 from Dometic. The indicator
light is not part of the basic system.
VACUUM HOSE
To complete a VacuFlush installation, OdorSafe® Sanitation Hose or rigid PVC pipe (Schedule 40 or heavier)
must be used. OdorSafe hose is specially formulated to
provide up to 16 times greater resistance to malodors
than other “no-odor” marine hoses.
VACUUM TOILETS
The VacuFlush 500 series features a large householdsize bowl and seat. The VacuFlush 1000 series also
features a deep bowl with an adult-sized seat. The
EcoVac series offers space-saving models with adultsized seats. All come with an attractive, easy-to-use flush
pedal.
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PRINCIPLES OF OPERATION
VacuFlush systems use a small amount of water (one
pint to one quart) and the vacuum that is generated by
the vacuum pump to flush. Each toilet must be connected to a pressurized water system. Fresh water is
recommended and will result in an odor-free bathroom.
If seawater is used, the water should be filtered.
No complicated user instructions are required. Lifting the
flush lever adds water to the bowl. Pressing the flush
lever (or pulling the flush lever on a 106 toilet) opens a
mechanical seal that allows the vacuum force to pull the
waste from the bowl as clean water rinses the bowl. The
vacuum moves the waste (at approximately 7 feet [2.1
m] per second) through a one-inch opening in the toilet
base. Incoming air fragments the waste as it passes
through the base opening. This process eliminates the
need for macerators or mechanical motors in the toilet
base.
Next, the waste is transferred into the Vacuum Holding
Tank (VHT). System vacuum is monitored by a vacuum
switch that is located on the outside of the VHT. When
the switch senses a drop in vacuum in the system, it
automatically signals the pump to energize and bring
the vacuum back to operating level. This process is normally completed in about one minute.
In a properly operating system, the stored vacuum will
“leak” down between flushes, causing the vacuum pump
to run for a short period. The pump should not run more
than once every three (3) hours after the last flush.
An “On-Off” night switch can be installed to silence the
vacuum pump during sleeping hours. The VacuFlush
Status Panel, an optional accessory, features an integral circuit breaker that provides a convenient night
switch.
IMPORTANT: Before pumping out the VHT, it
is recommended that the power to the system be
turned off. Then, flush the toilet. This releases the
stored vacuum in the tank, thus, allowing the
dockside pump to empty the waste out more easily.
If the dockside pump has low suction capability,
you may need to flush the toilet a second time
during the pump out.
The Vacuum Relief Valve (VRV) will automatically open
at 13" of vacuum and is spring loaded to close at 11" of
vacuum to prevent leaking during normal operation.
SYSTEM LAYOUT
The Vacuum Holding Tank (VHT) system can be installed
on most boats that presently use a portable, manual or
electric toilet. The following procedure will be helpful:
1. Review the typical system layout to get a general
idea of how the system will operate and what discharge
options will be considered (see Figure 1).
2. Draw or obtain a layout of the boat which allows the
location of head compartments, bulkheads, engine space,
tanks, through-hull fittings, etc. This layout should include
top views and side views and show relative distances
and heights with reasonable accuracy.
3. Use the information in the Component Locating
Procedure section to help select the best locations for
your boat layout.
4. Routing of vacuum hose should be considered when
selecting a location for the toilet and the (VHT). A
maximum of 20 feet (6.1 m) of hose can be used between the toilet and the VHT.
5. Before starting the actual installation, carefully review the Key Installation Points.
Figure 1
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