DOMETIC HTS-VG Series HTS Basic Holding Tanks Instruction Manual
- June 17, 2024
- Dometic
Table of Contents
DOMETIC HTS-VG Series HTS Basic Holding Tanks
HTS Benefits
Superior Durability: Dometic® holding tank systems (HTS) are molded from
linear low-density polyethylene (LLDP) resin. Polyethylene is best suited for
holding tank construction because of its resistance to corrosion and odor
permeation, and it will last longer than the life of a typical fiberglass
hull.
Leak-Proof Design : All hose connections in Dometic holding tanks are on
the top of the tank, eliminating the possibility of leakage due to a faulty
connection below the liquid level of the tank contents. Our unique dip tube
design reduces the risk of plugging while keeping the residual contents in the
tank to a minimum.
ISO/USCG Compliant : Dometic HTS models are fully compliant with the ISO
8099:2000(E) standard and applicable requirements of the United States Coast
Guard for pleasure craft installation.
Odor-Free Design : Dometic tanks have extra-heavy wall thickness to
prevent odor permeation. Holding tank systems can be fitted with a SaniGard™
in-line vent filter that stops unpleasant odors from escaping through the
holding tank vent.
Implosion Protection : Dometic holding tanks are equipped with a
TankSaver vacuum relief valve which prevents damage from dockside pumps that
operate at very high levels of vacuum. The TankSaver valve opens automatically
under vacuum conditions, but remains sealed regardless of shock-loading or
vibration.
Multiple Tank Outlets : Most HTS models are equipped with two discharge
outlets. One is for connection to a deck-mounted discharge fitting and one is
for connection to an overboard discharge pump.
HTS Components: Every HTS is built with high-quality Dometic sanitation
system components.
Installation
CHOOSING A LOCATION FOR THE 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.
Preparing a Mounting Surface
- Mount the tank to the surface that supports the entire area of the tank.
- If required, fabricate mounting surface and toe blocks from 13 mm or 19 mm (1/2-inch or 3/4-inch) plywood.
- Do not mount the tank on projections such as screws or bolt heads, which could puncture the tank.
- Do not allow the holding tank to block the 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.
- Simplify the 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.]
PLUMBING CONNECTIONS AND HOSE LAYOUTS
Avoid binding corners and sharp bends.
Do not use wire ties to secure the hose or pipe.
Support flexible hose every 12 inches (.3 m), and support rigid pipe every 5
feet (1.5 m).
When connecting flexible hose to plastic fittings, use Dometic Hose Lubricant
or silicone grease on end of the fitting and inside the hose end to make
connection easier.
Do not use any other lubricants, sealants, or adhesives when connecting
sanitation hoses and plastic fittings.
Do not restrict the ability to pull the hose or pipe.
IF HTS-BASIC TANK FITTINGS ARE NOT ASSEMBLED IN THE TANK, FOLLOW THESE STEPS.
3-inch cap – inspection port
- Place the cap into a 3-inch (76 mm) threaded hole (fig. 1 ) and tighten until hand-tight.
- Using a spanner wrench or large channel locks, tighten the cap until very little or no black seal is visible above the inlet port (fig. 2 ).
- To remove the cap for tank inspection, use a spanner wrench or large channel locks.
Inlet and discharge elbow fittings
- Apply threaded plastic pipe sealant around the threads of the elbow (fig. 3 ).
- Tighten the elbow into the desired fitting on the tank (fig. 4 ).
- To properly position the elbow to receive the sanitation hose, turn the elbow only in the clockwise direction (fig. 4 ). (Turning the elbow in the opposite direction may loosen the connection and cause leakage.)
- Make sure to connect waste discharge hose(s) to fitting(s) marked as “Waste Only.”
- When connecting the sanitation hose to plastic elbows, use silicone grease on end of the fitting and inside the hose end to help make the connection easier and leakproof. Be sure to use two hose clamps to secure each connection.
CLAMP CONNECTIONS FOR FLEXIBLE HOSE AND FITTINGS
Dometic recommends that each hose connection be secured with two hose clamps
to prevent any leaks.
SOLVENT BONDING FOR RIGID PIPE AND FITTINGS
- Use PVC cleaner on both bonding surfaces.
- Use PVC cement (must contain tetrahydrofuran) on both bonding surfaces.
- Connect parts using a twist and hold motion until the cement is set.
- Let the joint cure for at least four hours or according to instructions on PVC cement container. (Cold temperatures require longer cure times.)
Vent Line and 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. Over time, it will tend to kink and effectively block the vent.
- A holding tank vent filter will absorb heavier-than-air gases associated with sewage and eliminate a source of malodor from the exterior of the boat. See vent filter details in this manual (page 6).
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 the 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 Dometic 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 that 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 (237 ml) of
Dometic® Holding Tank Deodorant 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 VacuFlush® components, refer to the VacuFlush toilet
owner’s manual for winterization instructions.
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.
- Pump out the holding tank.
- Thoroughly flush the system with fresh water before adding propylene glycol freshwater antifreeze to the HTS.
HTS Components
**DTM04 Level Monitor and Micro-Float Switches***
I n c l u d e s f o u r t a n k levels – Empty, Low, Mid and Full. Micro-float
switches are installed in holding tank. No electri-cal components contact
waste or water. Operates on 12 or 24-volt DC. Uses only .008 amps at 12 V DC.
Micro-float switches are installed either as a unit (with a 3-inch cap) or as
separate indicators.
**VacuFlush Shutdown Relay***
To prevent overfilling a holding tank, a shutdown relay is supplied with HTS-
VG models. When the tank reaches “Full”, the relay shuts off the vacu-um
generator, preventing further flushing of the toilet.
TankSaver™ Vacuum Relief Valve
Prevents damage due to tank implosion from dockside pumps that generate very high vacuum. TankSaver valve opens automatically under vacuum but remains sealed regardless of shock-loading or vibrations.
**Holding Tank Vent Filter***
With odor-removing filter media, the vent filter stops odors from escaping the holding tank vent. Keeps boats smelling clean and pleasant. Each cartridge is good for an entire season and is easily replaced.
TW Discharge Pump
Runs dry without harm. Draws 6 amps at 12 VDC. Delivers flow rate of 3.9 gallons per minute (14.7 liters per minute). Connects to through-hull fitting. Check Marine Sanitation Regulations for information on areas where discharge is allowed.
- Not available on all HTS models.
VacuFlush® Vacuum Generators
On HTS-VG models, VacuFlush vacuum generators combine the vacuum tank and vacuum pump in one unit. All models eliminate hose runs between the vacuum tank and pump of previous VacuFlush systems. HTS vacuum generators feature high-performance vacuum pumps, offering quieter operation and faster vacuum generation than previous models.
Other HTS Features
- OdorSafe® Plus Sanitation Hose
OdorSafe Plus hose provides the best odor barrier of any marine hose available. It delivers up to 19 times greater resistance to sulfurous malodors than other “no-odor” marine hoses. On HTS models, it’s used for all 1.5-inch (38mm) hose connections. It’s also best for connecting the discharge pump to the through-hull and deck waste fittings.
Diptube Discharge
Our dip tube discharge design allows for the removal of waste from the top of the holding tank rather than near the bottom of the tank. This feature greatly reduces the opportunities for stagnant sewage to sit in tank discharge lines – a main cause of odor permeation and hose failure.
Plumbing, Electrical Specifications
Plumbing Connection Dimensions
- Inlet Fitting Size : 1-1/2 inch 38.1 mm
- Outlet Fitting Size : 1-1/2 inch 38.1 mm
- Vent Inlet/Outlet Size : 5/8 inch 15.9 mm
Electrical Requirements 12 VDC 24 VDC
- Vacuum Generator : 10 amp 5 amp
- Level Indicator : 3 amp 3 amp
- Discharge Pump : 10 amp 5 amp
- Requires separate circuit breaker.
Plumbing Fittings, Hose and Pipe
Dometic® valves and fittings are designed for use with 1-1/2-inch (38 mm)
ID OdorSafe® Plus sanitation hose and 1.5-inch (38 mm) ID PVC pipe.
Hose Ball Valve
Hose Fittings
Pipe Fittings
Plumbing Pipe and Hose
Customer Service
There is a strong, worldwide network to assist in servicing and maintaining
your toilet system. For the Authorized Service Center near you, please call
from 8:00 a.m. to 5:00 p.m. (ET) Monday through Friday.
You may also contact or have your local dealer contact the Parts Distributor
nearest you for quick response to your replacement parts needs. They carry a
complete inventory for the Dometic product line.
- Telephone: 1 800-321-9886
- U.S.A. and Canada 330-439-5550 International
- Fax : 330-496-3097 U.S.A. and Canada
- 330-439-5567 International
- Web site: Dometic.com
Warranty and Product Liability
North America and Rest of the World: Manufacturer’s One-Year Limited Warranty
- Dometic Corporation, Sanitation Division 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 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 INCIDENTAL OR CONSEQUENTIAL
DAMAGES, FOR DAMAGES RESULTING FROM IMPROPER INSTALLATION, OR FOR DAMAGES
CAUSED BY NEGLECT, ABUSE, ALTERATION OR USE OF UNAUTHORIZED COMPONENTS. ALL
IMPLIED WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR
FITNESS FOR ANY PARTICULAR PURPOSE, ARE LIMITED TO A PERIOD OF ONE YEAR FROM
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 or go to http://www.dometic.com/enus/Americas/USA
/Customer-Support/ for a dealer near you.
Europe: Warranty and Customer Service
Warranty arrangements are in accordance with EC Directive 44/1999/CE and the
normal conditions applicable for the country concerned. For warranty or other
service, please contact our Dometic Customer Service department. Any damage
due to improper use is not covered by the warranty.
The warranty does not cover any modifications to the product or the use of
non-original Dometic parts; the warranty does not apply if the installation
and operating instructions are not adhered to and no liability shall be
entertained.
Product Liability
Product liability of Dometic Group and its subsidiary companies does not
include damages that may arise from faulty operation; improper alterations or
intervention in the equipment; adverse effects from the environment which may
impact the equipment itself or the direct vicinity of the equipment or persons
in the area.
To obtain warranty service, first contact your local dealer from whom you
purchased this product or go to www.dometic.com to locate a dealer near you.
Dometic Corporation, Sanitation Division
- 13128 State Rt. 226, P.O. Box 38 Big Prairie, OH 44611 USA
- 1-800-321-9886
- Fax : 330-496-3097
- www.Dometic.com
REVISION A
Form No. 600343562 7/17
©2017 Dometic Corporation