Dometic SeaLand VHT12 User Manual

Dometic SeaLand VHT12

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1

This manual must be read and under-

stood before installation, adjustment,

service, or maintenance is performed.

Modication of this product can

result in property damage.

WARNING

!

Dometic Sanitation Corporation

13128 State Rt 226, PO Box 38

Big Prairie, OH 44611

SeaLand Product Customer Service: 1-800-321-9886

www.DometicUSA.com

SeaLand

®

VACUUM HOLDING TOILET

OWNER’S MANUAL

VHT12

Table of Contents

Questions and Answers:

A
Austin GallegosJul 31, 2025
What to do if my Dometic SeaLand VHT12 Plumbing Product toilet will not flush and there is no vacuum?
- E
  estradaamandaJul 31, 2025
  If your Dometic Plumbing Product toilet isn't flushing due to a lack of vacuum, here are a few things to check: * The pump might not be running. See problem 3 for troubleshooting steps. * A plugged vacuum line. Blockages are usually at the base of the toilet below the flush valve; you may need to disconnect the line and clear it. * A plugged pump valve. Inspect and clean the pump valves, replacing them if needed. * Vacuum pump discharge or intake lines plugged. Disassemble the lines and clean them.
J
Jessica SmithAug 8, 2025
Why does my Dometic SeaLand VHT12 Plumbing Product pump run too much between flushes?
- G
  Glenn DoyleAug 8, 2025
  Your Dometic Plumbing Product pump might be running too much between flushes due to several reasons: * A leaking flush ball in the toilet. To check, leave a small amount of water in the toilet bowl. If the water is sucked from the bowl, consult the VacuFlush Owner’s Manual. * A vacuum line leak. Try tightening all hose connections at the pump, vacuum tank, holding tank, and toilet. * Foreign material fouling the air pump valves. Disassemble the air pump and inspect under the two flat disk valves, removing any debris found. * A worn or damaged pump diaphragm. Inspect the diaphragm for holes or rips and replace if needed. * A duckbill valve in the discharge fitting stuck open. Disassemble the discharge outlet and inspect the duckbill valve, cleaning or repairing it as necessary.
M
Matthew ValenzuelaAug 15, 2025
What to do if my Dometic SeaLand VHT12 Plumbing Product pump will not run?
- M
  Mitchell HarrisonAug 15, 2025
  If your Dometic Plumbing Product pump isn't running, consider these potential causes: * **No power:** Check the input power, circuit breaker, and fuse. * **Loose or broken wiring:** Tighten or reconnect wires at the pump and vacuum tank. * **Improper electrical connections:** Ensure wires at the vacuum switch are connected to the “B” terminals. * **Faulty vacuum switch:** Short across the “B” terminals with a jumper wire to check the vacuum switch. * **Faulty motor:** Replace the motor.
J
Jamie SummersAug 23, 2025
How to fix a Dometic SeaLand VHT12 Plumbing Product pump that will not shut off?
- Y
  Yvette DunnAug 23, 2025
  If your Dometic Plumbing Product pump won't shut off, here's what you can investigate: * **Insufficient vacuum:** Verify the pump pulls a minimum of 10 inches Hg of vacuum. * **Excessive vacuum leak:** Refer to problem 1 for troubleshooting vacuum leaks. * **Faulty vacuum switch:** Remove one “B” terminal wire to check the switch. * **Improper wiring:** Check the wiring, referring to the wiring diagram.

Dometic SeaLand VHT12 Specifications

General

Brand	Dometic
Model	SeaLand VHT12
Category	Plumbing Product
Language	English

Summary

Product Features

Major Components

Vacuum Toilets

Describes different series of VacuFlush and EcoVac toilets, including bowl sizes and seat options.

Vacuum Holding Tank (VHT)

Explains the VHT's function, materials, integrated pump, pressure switch, and VRV safety feature.

Vacuum Hose

Details the required OdorSafe Plus hose or rigid PVC pipe for connecting the system.

Principles of Operation

System Layout

Component Locating Procedure

Vacuum Toilet

Guidelines for determining the best location and mounting space for the vacuum toilet.

Vacuum Holding Tank (VHT)

Placement criteria, mounting instructions, and environmental considerations for the VHT.

Vacuum Hose and Fittings

Requirements for using OdorSafe Plus hose, SeaLand fittings, and bend radius.

Key Installation Points

Installation of Components

Winterizing

Troubleshooting Guide

Dimensional Specifications

Manufacturer's One-Year Limited Warranty

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