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Pipework - selection of correct method
YOU MUST select the correct method for the inlet pipework from 2 options and for
the outlet pipework from 4 options, according to whether the toilet is above or below
the waterline, and to whether it discharges the waste overboard or into an on-board
holding tank.
WARNING. HAZARD RISK: Bowl Rim Below Waterline.
USE VENTED LOOPS!
If the toilet is connected to ANY through-hull fittings, and if the rim of the bowl
falls below the waterline, water may flood in causing the craft to sink, which may result in
loss of life.
Therefore, if the rim of the toilet is less than 8" (20cm) above the waterline when the craft is at
rest, or if there is ANY possibility that the rim of the bowl may be below the waterline at ANY
time, a ventilated anti-syphon loop MUST be fitted in any pipework connected to a through-
hull fitting, irrespective of whether inlet or outlet.
SPECIAL NOTE 1: The smaller bore inlet pipework is more hazardous than the larger outlet
pipework. Unless there is a ventilated anti-syphon loop in the inlet pipework, water will flow
into the bowl whenever both the inlet seacock is open and the rim of the bowl is below the
actual waterline.
SPECIAL NOTE 2: Making a loop in the hose without fitting a vent may be just as hazardous
as no loop at all, because water may syphon over a loop. It is the vent that actually prevents
the syphon.
WARNING. HAZARD RISK: Pipework Becomes Loose.
USE HOSE CLAMPS!
If the toilet is connected to ANY through-hull fittings and if the pipework be-
comes disconnected, either from a through-hull fitting or seacock, or from the toilet or any
secondary valve, water may flood in and cause the craft to sink, which may result in loss of life.
Therefore the ends of ALL flexible hoses fitted directly or indirectly between the toilet and ANY
through-hull fitting that may possibly be below the waterline at ANY time, MUST be secured to
the hose tails to which they are connected, using two stainless steel worm-drive hose clamps.
Pipework - General instructions for all options
YOU WILL need:
•
Spiral reinforced smooth bore flexible hoses for both the 3/4" (19mm) inlet and the
1-1/2" (38mm) outlet pipework.
•
Two stainless steel worm-drive hose clamps for every hose tail connection.
•
Secure the hose runs so that the hoses cannot move and chafe, and so that they do not
exert any leverage on the hose tail fittings to which they are connected, as this may
cause adjacent joints to leak.
•
Avoid sharp bends in the hoses as this may cause them to become kinked.
•
Keep all pipework runs as straight and as short as possible, avoiding rising and falling
over obstructions which creates airlocks.
•
If it is difficult to fit the hose onto the hose tails of the toilet or seacocks, lubricate it with
water, or soften the hose by dipping the end in hot water.
Caution! Do not apply flame to the hose. Do not apply flame or heat to
the plastic hose tails on the toilet, rinse pump or solenoid valve. Do not
use oils, greases or synthetic lubricants. Do not apply sealing compounds
to any hose connections. Do not over tighten hose clamps. Any of these
actions may result in cracking or breakage of the plastic parts.
•
Secure the ends of all hoses to the hose tails with two stainless steel worm-drive
hose clamps, ensuring that all inlet connections are airtight and that all the outlet
connections are water tight.
Fresh Water Rinse Pipework
YOU WILL need:
•
A 'T' piece that fits your boat's pressurized water system pipework.
Caution! Turn off power to the water pressure system pump, and open
cold water taps to de-pressurize the system.
•
Install a 'T' fitting in the pressurized cold water pipework near to the toilet to provide a
½" (13mm) feed to the Solenoid Valve.
Caution! If you ever connect your water system to unregulated City
Water supply, you MUST fit or use a Pressure Regulator to prevent risk of
flooding.
•
Mount the Solenoid Valve assembly (key 31) in a dry location.
•
Install suitable pipework between the 'T' fitting and the 1/2" (13mm) inlet port on the
Solenoid Valve.
•
Run ¾" (19mm) hose by the most direct route from the 3/4" (19mm) outlet port on the
Solenoid Valve to the Rinse Intake Elbow.
Raw Water Rinse Pipework - 2 options
•
Install the Raw Water Rinse pump (key 32) in a dry position close to the toilet where it
will not be more than 6ft (2m) above the heeled waterline at any time.
•
Fit the Pumpguard ™ (key 33) supplied to the inlet of the Rinse pump.
•
For more detail refer to the separate Data Sheet supplied with the Rinse pump.
Option 1:
Toilet below the heeled waterline
YOU MUST fit a 3/4" (19mm) Vented Loop fitting, Jabsco part number 29015-0000.
•
Run 3/4" (19mm) hose by the most direct route from the inlet seacock to the inlet of
the Pumpguard™ fitted to the Rinse pump.
Caution! Do not position the ventilated anti-syphon loop between the
inlet seacock and the rinse pump , because it may prevent the rinse
pump from priming.
•
Arrange a length of 3/4" (19mm) hose between the Rinse pump outlet and the Rinse
Intake Elbow (key 3), to form an anti-syphon loop whose highest point is at least 8"
(20cm) above the highest possible waterline, and fit the ¾" (19mm) Vented Loop at the
highest point.
Option 2:
Toilet always above the heeled waterline
•
Run 3/4" (19mm) hose by the most direct route from the inlet seacock to the inlet of
the Pumpguard™ fitted to the Rinse pump.
•
Run 3/4" (19mm) hose by the most direct route from the outlet of the Rinse pump to
the Rinse Intake Elbow.
Discharge Pipework - 4 options
Option 1:
Toilet below the waterline and discharging overboard.
YOU MUST fit a 1½" (38mm) Vented Loop fitting, Jabsco part number 29015-0010.
•
Run 1-1/2" (38mm) outlet hose from the non-return valve assembly (key 24) to form a
loop which is at least 8" (20cm) above the highest possible waterline, and fit the 1-1/2"
(38mm) Vented Loop at the highest point.
Option 2:
Toilet always above the heeled waterline and discharging overboard.
•
Run 1½" (38mm) outlet hose from the non-return valve assembly (key 24) down to the
outlet seacock by the most direct route.
Option 3:
Toilet discharging into holding tank AND top of holding tank above
non-return valve at any time.
YOU MUST FIT a 1-1/2" (38mm) Vented Loop fitting, Jabsco part number 29015-0010.
If there is ANY possibility that the discharge non-return valve assembly (key 24) may be
•
below the top of the tank at ANY time, a ventilated anti-syphon loop must be fitted in
the outlet pipework to ensure that the contents of the tank do not syphon out through
the bowl.
•
Arrange the outlet hose to form a loop which is at least 8" (20cm) above the highest
possible level that the top of the tank may reach, and fit the Vented Loop at that highest
point.
Option 4:
Toilet discharging into holding tank, AND non-return valve always
above the top of holding tank.
Run the outlet hose by the most direct route from the non-return valve assembly (key 24)
down to the holding tank inlet.
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