5
Dometic Vacuum Holding Tank
Intended use
Vacuum relief valve (not available on all VHT models).
Provides additional protection against
potential tank collapse if subjected to excessive vacuum pressure during pump-out .
Long-lasting reliability.
Tank is constructed of high-strength polyethylene . Pump motor can operate
dry without burning up .
Energy efficient.
Draws only 3 amps in 12 V DC system .
4 Components
4.1
Vacuum holding tank
(fig .
2
, page 2)
Ref
Description
A
Vacuum pump
B
Vent fitting
C
Vacuum switch
D
Vacuum relief valve
(not available on on all models)
Ref
Description
E
Shutdown relay
F
Inlet fitting (from toilet)
G
Discharge fitting
4.2
VacuFlush toilet system
(fig .
9
, page 3)
Ref
Description
A
VacuFlush toilet
B
Vacuum holding tank
C
Status panel
D
Vent filter
Ref
Description
E
Discharge pump
F
Dockside discharge fitting
G
Thru-hull vent fitting
H
Overboard discharge fitting
5 Specifications
5.1 Materials
Holding tank:
polyethylene; 0 .25 in ./6 .3 mm nominal wall thickness
Plumbing fittings:
polyvinyl chloride
Pump body:
Glass-filled polypropylene
5.2 Electrical
Model
Voltage (DC)
Power Draw
(amp average)
Fuse/
breaker
VHT12
12
3
5
* 14-gauge or larger diameter wire is recommended .
Specifications subject to change without notice .
