BASIC HOLDING TANK SYSTEM
OWNER'S MANUAL
For VacuFlush® and other marine sanitation systems
WARNING
!
This manual must be read and under-
stood 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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INSTALLATION
CHOOSING ALOCATION FOR THE BASIC HTS
As a general rule, the HTS should be positioned as low in the hull as possible with all interconnecting hoses or pipes
sloped to permit gravity drainage and prevent potential hose odor permeation.
The holding tank must not be exposed to temperatures above 120°F (45°C). Do not place near heat sources such as
engine manifolds, water heaters, generators, etc.
Be certain to estimate holding tank weight when filled (typical effluent weighs about 9 lbs. per 1 gallon or 1.08 Kg per
liter). Make certain to allow for total filled weight when selecting materials for mounting the tank. Also consider impact
of full tank on vessel trim.
PREPARINGA MOUNTING SURFACE
1. Mount tank to surface that supports the entire area of
the tank.
Mounting surface
2. If required, fabricate mounting surface and toe blocks
made from plywood and
from 13 mm or 19 mm (1/2-inch or 3/4-inch) plywood.
securing straps
3. Do not mount tank on projections such as screw or
bolt heads, which could puncture the tank.
4. Do not allow holding tank to block free flow of bilge
water.
AVOIDING HOSE ODOR PERMEATION
•
Hose failure due to odor permeation almost
always occurs in hose runs which retain
sewage when the system is not in use.
•
•
•
Eliminate all unnecessary runs which retain
trapped liquids, if possible.
Where possible, use rigid PVC pipe in
sections that cannot be arranged to drain.
Complicated plumbing layout
Simplify hose layout by removing unnecessary
valves. [For specific installations, some
regulations and standards may require the
installation of a vented loop (anti-siphon
valve), one-way valve or seacock in sewage
discharge piping.]
Simplified plumbing layout
BASIC HTS CONNECTIONS
Outlet to deck discharge fitting
Inlet from toilet
Inspection port
Outlet to
through-hull
discharge fitting
Vent line/vent filter
TankSaver
vacuum relief valve
3
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INSTALLATION (cont’d)
PLUMBING CONNECTIONS AND HOSE LAYOUTS
When connecting flexible hose to plastic fittings, use liquid dish soap on end of
fitting and inside hose end to make connection easier.
Do not use any other lubricants, sealants or adhesives when connecting sanitation hoses and fittings.
Do not restrict the ability to pull the hose or pipe.
TABS
AVOID
AVOID
YES
Trough
support
STRINGER
reinforcement stringers and tabs.
EXCELLENT
CLAMP CONNECTIONS FOR FLEXIBLE HOSE AND
FITTINGS
SOLVENT BONDING FOR RIGID PIPEAND FITTINGS
1. Use PVC cleaner on both
bonding surfaces.
Dometic recommends that each hose connection be
secured with two hose clamps to prevent any leaks.
2. Use PVC cement (must
contain tetrahydrofuran) on
both bonding surfaces.
Position clamp screws 180° apart from
each other and tighten clamps.
1
3. Connect parts using a twist
and hold motion until the
cement is set.
4. Let the joint cure for at least
four hours or according to
instructions on PVC cement
container. (Cold tempera-
tures require longer cure
times.)
2
3
4
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INSTALLATION (cont’d)
VENT LINEAND FILTER INSTALLATION
•
Holding tank vent lines must be free of low points which can trap
liquid and prevent the free flow of gases from or air into the holding
tanks.
•
•
Do not use non-reinforced hose for vent lines. It will tend to kink over
time effectively block vent.
A holding tank vent filter will absorb heavier than air gases associ-
ated with sewage and eliminate a source of malodor from the exterior
of the boat. See vent filter details in this guide.
When installing vent filters that are not mounted directly on an HTS unit:
•
Avoid areas near excessive heat sources such as engine manifolds
or lights.
•
•
Do not install the filter below top of holding tank.
The filter can be mounted in any position. Installations near the
through-hull vent reduce the chance of filter damage from overfilling
of the holding tank.
SERVICE ACCESS
Because SeaLand holding tanks may require minimal service in normal operation, the tank must be installed so that there
is easy access to the tank inspection port, discharge pump and vent filter (if installed).
An in-line maintenance valve must be installed in any piping runs which retain liquid and are connected to components
that may require periodic servicing (such as discharge pumps).
CLEANING
A small amount of water remains in all marine holding tanks. It is good practice to rinse the tank after the contents
have been discharged. This can be accomplished by adding water to the toilet bowl. Add 8 ounces (237ml) of
SeaLand® Holding Tank Deodorant and Cleaner to the bowl. Flush the entire contents into the holding tank and
continue flushing until the discharge from the holding tank is clear.
Do not use chlorine-based cleaners, caustic cleaners or chemicals, such as drain-opening products, as they may
damage the system’s seals and hose.
WINTERIZING
If using the HTS with SeaLand’s VacuFlush components, refer to VacuFlush Owner’s Manual for winterization instruc-
tions. If using antifreeze to winterize the HTS, use only propylene glycol freshwater antifreeze that does not contain
alcohol. Antifreeze that contains alcohol will result in damage to your sanitation system.
1. Pump out holding tank.
2. Thoroughly flush the system with fresh water before adding propylene glycol freshwater antifreeze to the HTS.
5
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PLUMBING FITTINGS, HOSEAND PIPE
SeaLand® valves and fittings are designed for use with 1-1/2" (38mm) ID OdorSafe® Plus sanitation hose and 1-1/2"
(38mm) PVC pipe.
HOSE BALL VALVE
PART NO.
DESCRIPTION
307346087
307346087
Ball Valve Non-corrosive PVC with Teflon® seals.
HOSE FITTINGS
PART NO.
DESCRIPTION
307230310
307230311
307230310
Hose Mender Kit Connects 1½" (38mm) for maintenance purposes.
307230311
307230312
307230313
307238798
307238802
307341113
307341513
90º Bend Kit Provides smooth sweep bend. Eliminates hose kinking in sharp bends.
Hose Adapter Kit Connects 1½" (38mm) hose to 1½" (38mm) NPT thread.
Double Bend Kit Connects intersecting 1½” (38mm) hose segments per indicated flow.
Wye Kit Connects intersecting 1½" (38mm) hose segments per indicated flow.
Tee Kit Connects intersecting 1½" (38mm) hose segments per indicated flow.
Reducing Adapter Connects 1½” (38mm) hose to 1" (25mm) hose.
307230312
307230313
307238798
307341113
307238802
307341513
Custom Hose Adapter Can be used with all 1½" (38mm) PVC fittings with socket
connection. Lubricated hose or cuff slides on easily.
307348684
307238803
Flexible Vinyl Couplings 3" (76mm) length of soft vinyl to couple 1 ½" (38mm) hose
adapter fittings.
Hose Tail Piece Connects hose to 1½" (38mm) MPT with swivel nut and sealing ring
included.
307348684
307238803
307341143
PIPE FITTINGS
PART NO.
DESCRIPTION
307341085
307341425
307341085
Pipe Coupling Connects 1½" (38mm) PVC pipe sections.
307341143
307341425
307347286
307341812
307341158
307342971
90º Bend 90º Ell for connecting 1½" (38mm) PVC pipe sections.
Threaded Male Adapter Adapts 1½" (38mm) PVC pipe to 1½" (38mm) NPT thread.
45º Wye Makes three way connection to 1½" (38mm) PVC pipe.
Double Bend Makes three way connection of 1½" (38mm) PVC pipe.
Sanitary Tee Makes three way connection of 1½" (38mm) PVC pipe.
307347286
Special Adapter for Toilet Outlet Adapts VacuFlush toilet outlet to other PVC pipe
307341812
307342971
connections.
307341104
307341161
PVC 45° Street Ell For custom fitting design. Adapts to all 1½" (38mm) PVC fittings
shown here.
307341158
307341104
PVC 90° Street Ell For tight bends. Can be used with other PVC fittings shown. 1½"
(38mm) Hub.
PLUMBING PIPE AND HOSE
PART NO.
DESCRIPTION
307341161
307001540
PVC Rigid Pipe 1½" (38mm) ID x 5-ft. (1.5m) length.
307342871
307345650
OdorSafe® Plus Sanitation Hose 1½" (38mm) ID x 50-ft. (15.2m) roll.
Vent Hose 5/8" (16mm) ID x 50-ft. (15.2m) roll. Use for holding tank vent line.
Connects to SaniGard vent filter.
307342871
6
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OPTIONAL HTS COMPONENTS
TankWatch® 4 Level Monitor and Micro-Float
Switches
TankMaster™ 4 Automatic Discharge Pump
Control
Increases owner convenience
and simplifies plumbing
system layout. Diverts sewage
directly overboard in unre-
stricted waters with the simple
turn of optional keyed control
switch to “automatic” position.
Prevents accidental overboard
Includes four tank level indicator lights – Empty, Low,
Mid and Full, and international symbology of four tank
levels. One light is always on. Reliable micro-float
switches are installed in holding tank. No electrical
components come in contact with waste or water.
Operates on 12 or 24-volt DC. Uses only .017 amps at
13-volts.
discharge in restricted waters
when control switch is turned to “off” position. Simpli-
fies plumbing by eliminating wye valves, seacocks and
vented loops. Automatically maintains holding tank at
empty level and eliminates stagnating sewage stand-
ing in interconnecting hoses. Works in conjunction with
optional discharge pump, TankWatch level indicators
and seacock interlock system.
Lighted
Tank Level
Monitor
SaniGard™ Holding Tank Vent Filter
The vent filter stops odors that escape from the holding
tank vent. It contains odor-removing filter media to keep
your boat smelling clean and pleasant. Each cartridge
is good for an entire season and is easily replaced for a
fresh start. The vent filter includes mounting brackets
and hose adapters, and is available with either 5/8"
(16mm) (p/n 309310002), 1" (25mm) (p/n 309310005)
or 1½" (38mm) (p/n 309310003) hose fittings.
Micro-Float
Switches and
Tank Cap
SaniPump™ Overboard Waste Discharge Pump
This T-series discharge pump can run dry without harm
and draws just 6 amps at 12 VDC. Delivers flow rate of
just over 3.9 gallons per minute (14.7 liters per minute).
Emptying the tank of a 10-gallon tank takes about three
minutes, and for a 42-gallon tank, about 11 minutes.
The discharge pump is connected to a through-hull
fitting. Check Marine Sanitation Regulations for informa-
tion on areas where discharge is allowed. 12 VDC
model – p/n 360301200. 24 VDC model – 360302400.
Toilet System Shut-Off Relay
Shuts down electrically operated toilet systems,
including VacuFlush, when holding tank is full.
Operates with TankWatch 4 level monitor.
Available in 12- or 24-volt DC. (Not shown.)
7
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ORDERING PARTS
Dometic is ready to assist you in the event service is required. Before calling, please have the following information available.
Your cooperation in having this information ready is appreciated and allows us to better meet your needs.
1. Basic HTS Model Number (see Parts List on separate sheet)
2. Serial Number
3. Part Number, Description and Quantity (see Parts List)
CUSTOMER SERVICE
There is a strong, worldwide network to assist in servicing and maintaining your sanitation system. For the
Authorized Service Center near you, please call from 8:00 a.m. to 5:00 p.m. (ET) Monday through Friday.
Telephone: 1 800-321-9886 U.S.A. and Canada
330-496-3211 International
Email:
MANUFACTURER'S ONE-YEAR WARRANTY
Dometic warrants, to the original purchaser only, that this product, if used for personal, family or household purposes, is free
from defects in material and workmanship for a period of one (1) year from the date of purchase.
If this Dometic product is placed in commercial or business use, it will be warranted, to the original purchaser only, to be free
of defects in material and workmanship for a period of ninety (90) days from the date of purchase.
Dometic reserves the right to replace or repair any part of this product that proves, upon inspection by Dometic, to be defective
in material or workmanship. All labor and transportation costs or charges incidental to warranty service are to be borne by the
purchaser-user.
EXCLUSIONS
IN NO EVENT SHALL DOMETIC BE LIABLE FOR INCIDENTALOR CONSEQUENTIAL DAMAGES, FOR DAMAGES RESULTING
FROM IMPROPER INSTALLATION, OR FOR DAMAGES CAUSED BY NEGLECT, ABUSE, ALTERATION OR USE OF UNAU-
THORIZED COMPONENTS. ALLIMPLIED WARRANTIES, INCLUDINGANY IMPLIED WARRANTY OF MERCHANTABILITY OR
FITNESS FORANY PARTICULAR PURPOSE, ARE LIMITED TOAPERIOD OF ONE YEAR FROM THE DATE OF PURCHASE.
IMPLIED WARRANTIES
No person is authorized to change, add to, or create any warranty or obligation other than that set forth herein.
Implied warranties, including those of merchantability and fitness for a particular purpose, are limited to one (1) year from the
date of purchase for products used for personal, family or household purposes, and ninety (90) days from the date of purchase
for products placed in commercial or business use.
OTHER RIGHTS
Some states do not allow limitations on the duration of an implied warranty and some states do not allow exclusions or
limitations regarding incidental or consequential damages; so, the above limitations may not apply to you. This warranty gives
you specific legal rights, and you may have other rights which vary from state to state.
To obtain warranty service, first contact your local dealer from whom you purchased this product.
Dometic is the leading worldwide provider of product systems for
increased convenience away from home. Dometic provides RV and
Pleasure Boat Systems, Silent Refrigeration Systems and Medical
Dometic Corporation • Sanitation Systems
13128 State Rt 226, PO Box 38
Systems. Dometic continuously applies the group’s industrial and tech-
nological expertise to new, related fields of business.
Big Prairie, OH 44611
SeaLand Product Customer Service: 1-800-321-9886
(8:00 a.m. - 5:00 p.m. ET)
Dometic has production facilities in 10 countries, its own sales and
marketing operations in 35 countries plus approximately 65 distributors
globally.
Registered; ™ Trademark of Dometic Corporation
2004 Dometic Corporation
600344867 1/04
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