Dometic MasterFlush 7640 User manual

Macerator toilet
Installation and
Operating Manual . . . . . . . . . . . 6
Toilette à broyeur
Instructions de montage
et de service . . . . . . . . . . . . . . 23
Inodoro triturador
Instrucciones de montaje
y de uso . . . . . . . . . . . . . . . . . . 42
Sanita de trituração
Instruções de montagem e
manual de instruções. . . . . . . . 61
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PT
MasterFlush7640

MasterFlush7640
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Explanation of symbols MasterFlush7640
6
Please read this instruction manual carefully before installation and
first use, and store it in a safe place. If you pass on the product to
another person, hand over this instruction manual along with it.
Contents
1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Safety instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Technical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7 Maintenance and winterizing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
9 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
10 Limited warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
11 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1 Explanation of symbols
!
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CAUTION!
Safety instruction: Failure to observe this instruction can lead to
injury.
NOTE
Supplementary information for operating the product.

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MasterFlush7640 Safety instructions
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2 Safety instructions
The manufacturer accepts no liability for damage in the following cases:
Faulty assembly or connection
Damage to the product resulting from mechanical influences
Alterations to the product without express permission from the manu-
facturer
Use for purposes other than those described in the operating manual
2.1 Warnings
The following statement must be read and understood before installing,
servicing and/or operating this product. Modification of this product may
result in property damage.
The manufacturer recommends that a qualified RV technician or electrician
install or service this product with regard to all applicable codes and regula-
tions. Equipment damage, personal injury or death could result from
improper installation.
!CAUTION!
Overfilling the holding tank can create serious damage to the
sanitation system, such as rupturing the holding tank and releas-
ing tank contents into the motorhome. To prevent this possibility,
the manufacturer recommends using the “full tank” shut-down
circuitry in the toilet’s electronic control module. The “full” signal
from the holding tank can be generated by an optional Dometic
DTM01C tank monitor or DTM04 four-level tank monitor system.

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Intended use MasterFlush7640
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3 Intended use
The Dometic MasterFlush7640 toilet provides an electric-flush toilet that
macerates waste and pumps it to a holding tank or other effluent storage or
disposal system. Operated by a flush pedal, the toilet allows the user to add
water to the bowl (before using or flushing) and to flush the toilet.
4 Technical description
4.1 Benefits
Convenient electronic flush. Add water or flush by pressing on the flush
pedal.
Choice of two water consumption settings. “Normal” flush uses 0.83 gal.
(3.1 l) per flush and adds water to bowl after flush; “Dry Bowl” setting uses
only 0.21 gal. (0.79 l) per flush and does not add water to the bowl.
Versatile installation. Powerful macerator pump allows toilet to be located
up to 40 ft. (12.2 m) away from holding tank or other discharge line destina-
tion.
Automatic “full tank” shut-down. When connected to a holding tank level
indication system (such as Dometic DTM01 system), the MasterFlush7640
toilet will not flush when the holding tank is full. This safety features prevents
overfilling the holding tank, which may cause damage to the motorhome.

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MasterFlush7640 Installation
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4.2 Components
Please refer to complete parts list (printed separately) for more details.
5 Installation
I
No. in
fig. 1, page 3 Description
1 Vacuum breaker cover
2 Vacuum breaker
3 Macerator pump
4 Pump/base cover
5 Floor flange mounting hardware kit
6 Electrical wires
7 Floor flange seal
8 Water valve
9 Flush pedal
10 Toilet base
11 Toilet bowl
12 Toilet seat
– Remote mounting hardware kit
NOTE
Be sure foot pedal, when pressed, touches same flat surface
on which toilet is installed.
Be sure to follow recommended installation requirements
(chapter “Minimum installation requirements” on page 21).
The toilet is not intended for installation in a shower.

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Installation MasterFlush7640
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5.1 Tools required
pliers or adjustable wrench
7/16 in./11 mm wrench
electrical connection tools
5.2 Installation on floor flange
1. To replace an older toilet:
– Turn off water supply to toilet
– Remove and drain water supply line.
– Remove toilet hold-down bolts/screws.
– Remove toilet from floor.
– Remove and discard old floor flange seal and hold-down bolts.
– Verify center of floor flange is at least the recommended rough-in
distance from back wall (fig. 3A, page 3 and chapter “Rough-in
dimensions” on page 22).
– Make sure top surface of floor flange is clean and free of any debris
or sealant.
2. If installing a new floor flange:
– Make certain that toilet mounting holes are at the correct location
(fig. 3D, page 3).
– Floor flange must be secured to floor with a minimum of four screws
(eight are preferred).
– Insert two supplied T-bolts into slots in floor flange (fig. 4, page 4).
3. Verify that floor flange seal is installed on base of toilet (fig. 51,
page 4).
4. Carefully set toilet over floor flange.
5. Align holes in toilet base with T-bolts as toilet is lowered onto floor
flange. Toilet must be aligned so that outlet of base fits inside of floor
flange outlet hole.
INOTE
Entire toilet base does not rest completely on floor yet. Floor seal
must be compressed in following steps.

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MasterFlush7640 Installation
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6. Install floor mounting nuts and washers onto T-bolts. Carefully torque
nuts to 30 – 40 inch-pounds (3.4 – 4.5 Nm). Do not overtighten. Alter-
nate between sides when tightening to prevent distortion of base. When
tight, base should be securely attached and flat against floor. Attach bolt
covers onto nuts (fig. 52, page 4).
7. Connect water supply line and torque connection to 30 – 40 inch-
pounds (3.4 – 4.5 Nm). Do not overtighten (fig. 53, page 4).
8. Connect electrical power to toilet according to wiring diagram on toilet’s
parts list (printed separately).
9. Turn on electrical power to toilet.
10. Turn on water supply to toilet.
11. Flush toilet several times and check for leaks.
12. Attach pump/base cover (fig. 55, page 4) to base with screws on sides
of toilet base (fig. 6, page 4) and with locking tabs on sides and back.
5.3 Remote installation
1. To install toilet separate from holding tank (not on typical floor flange),
position toilet in location with same clearances as flange mounted toilet
(fig. 3, page 3 and chapter “Rough-in dimensions” on page 22).
2. Mark fastener hole locations through two holes in base.
3. Drill pilot holes for hex screws in Remote Mounting Hardware Kit.
4. Remove black rubber elbow from check valve (fig. 54, page 4) in back
of toilet (fig. 7, page 5).
5. Route either 1.5 in. (38 mm) ID flexible sanitation hose or 1.5 in.
(38 mm) ID PVC or ABS pipe from waste tank to check valve. Plumbing
can be routed either above- or below-floor as required. Access holes
may need to be drilled through floor or wall depending on installation
layout (fig. 8, page 5). Flexible sanitation hose can be connected
directly to check valve with two hose clamps.
6. Route and connect appropriate wiring and water line according to
chapter “Installation on floor flange” on page 10.
7. Fasten toilet to floor with hex-head screws on each side of base.
8. Cover fasteners with plastic caps.
9. Turn on water supply to toilet.

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Operation MasterFlush7640
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10. Flush toilet several times and check for leaks.
11. Attach pump/base cover (fig. 55, page 4) to base with screws on sides
of toilet base (fig. 6, page 4) and with locking tabs on sides and back.
6 Operation
6.1 Add water to bowl
1. To add water to the toilet, press the flush pedal part way down (fig. 9,
page 5).
2. To avoid possible overflow, water flow will stop automatically if pedal is
pressed too long. More water is usually added only when flushing solids.
6.2 Flush toilet
1. To flush, press pedal down completely, then release it (fig. 9, page 5).
2. This activates a powerful macerator pump that siphons water and waste
from the toilet bowl, macerates and propels the effluent to the holding
tank.
!
I
CAUTION!
Flush only water, bodily wastes and rapid-dissolving toilet tissue.
Do not flush wet wipes, sanitary napkins, diapers, paper cups,
cotton swabs, food, hair or liquids such as oils or solvents as
clogging or damage to the toilet or toilet system may occur.
NOTE
Residual water trickle in ceramic bowls: Due to integrated rim
of this toilet bowl, water may continue to slowly trickle into toilet
bowl for up to 20 minutes after flushing. If water trickle
continues after 30 minutes, replace water valve.
Make sure all guests understand toilet operation before use.

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MasterFlush7640 Maintenance and winterizing
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6.3 Changing “Flush” modes
MasterFlush7640 toilets offer two flush settings to help manage water
consumption:
Normal flush – Uses 0.83 gal. (3.1 l) per flush. Adds water to bowl after
every flush.
Dry Bowl flush – Uses 0.21 gal. (0.79 l) per flush. Does not add water to
bowl after flush.
1. To change from Normal to Dry Bowl flush setting, press flush pedal for
about 10 seconds.
✓Flush mode has been changed to Dry Bowl setting.
2. Change mode to Normal flush by following the same procedure.
7 Maintenance and winterizing
7.1 Routine toilet cleaning
For routine cleaning, use Dometic Toilet Bowl Cleaner. If this cleaner cannot
be found in your area, contact the manufacturer for your nearest dealer (see
the back of the manual for the addresses). If the cleaner is not available, use
most any nonabrasive bathroom and toilet bowl cleaner. Please follow label
instructions.
!CAUTION!
To avoid damaging internal seals, do not clean toilet with abrasive
cleaners, caustic chemicals, or lubricants and cleaners that
contain alcohols or petroleum distillates.

EN
Maintenance and winterizing MasterFlush7640
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7.2 Routine maintenance
Monthly
1. Inspect toilet, plumbing, and plumbing connections, wires, and wire
connections.
2. Open and close all plumbing valves.
3. Check in-line water filters, if any, for blockage.
Yearly
1. Check water valve filter. Also check water valve filter if water flow into
toilet becomes insufficient.
7.3 During extended periods of non-use
The macerator toilet and sanitation system should be protected if toilet will
not be needed for an extended period of time (more than two weeks,
especially in hot weather).
1. Flush toilet in “Normal” mode and add 4 oz. (120 ml) of liquid bio-
degradable laundry detergent (should NOT contain bleach or environ-
mentally harmful substances).
2. Flush toilet at least five times.
3. Turn off water supply to toilet.
4. Flush the toilet without water. Repeat three times. (This procedure will
minimize any remaining water in the macerator pump.)
5. Turn off power to the toilet.
If system will be subjected to freezing temperatures, please follow above
procedure, and then winterize system as described below.

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MasterFlush7640 Maintenance and winterizing
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7.4 Winterizing
At the end of each camping season, or when the vehicle is stored for long
periods of time during which the toilet may be exposed to freezing tempera-
tures, the toilet system should be winterized for storage by using potable
water-safe antifreeze.
!
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Non-toxic Antifreeze Winterization
1. Drain potable water tank and empty waste holding tank.
2. Add freshwater antifreeze to potable water tank according to mixture
instructions from antifreeze manufacturer.
3. Flush toilet several times until antifreeze mixture has flowed completely
through toilet, macerator pump and holding tank.
4. Turn off power to toilet.
Each installation is different, so antifreeze mixture amounts may vary. User
discretion is required to assure adequate protection.
I
CAUTION!
This toilet is not intended for use when exposed to tempera-
tures below freezing.
Never use automotive-type antifreeze (ethylene glycol) in
freshwater systems.
NOTE
Use nontoxic antifreeze (propylene glycol) designated for potable
water systems. See vehicle owner’s manual.
NOTE
Never leave vehicle unoccupied for extended periods of time with
municipal water supply or onboard water pump turned on when
there is a possibility of freezing temperature.

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Troubleshooting MasterFlush7640
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8 Troubleshooting
9 Disposal
1. Place the packaging material in the appropriate recycling waste bins
wherever possible.
MIf you wish to finally dispose of the product, ask your local recycling
centre or specialist dealer for details about how to do this in
accordance with the applicable disposal regulations.
Problem Possible cause Suggested remedy
Flush cycle operates
correctly but water in the
bowl empties slowly or not
at all.
Discharge piping is
pinched or kinked.
Check discharge piping.
The macerator pump or
discharge piping is
blocked.
Clear blockage.
Macerator pump makes
unusually loud noise or
continually trips breaker.
Foreign material in pump
chamber.
Clear foreign material
from pump chamber.
Flush cycle is not
activated after pressing
flush pedal.
Electrical power to toilet is
shut off or disrupted.
Check wiring and circuit
breakers (or fuses).
Flush pedal is malfunc-
tioning.
Replace switch in flush
pedal.
Circuit board is malfunc-
tioning.
Replace circuit board.
Holding tank is full and
signal from tank has shut
down electrical power to
toilet (if tank level monitor
system is installed).
Empty holding tank.
Insufficient or no water
enters the toilet bowl.
Water supply line is
pinched or kinked.
Check water supply line.
Screen in water valve is
blocked.
Clear blockage at water
valve.
Water valve is malfunc-
tioning.
Replace water valve.

EN
MasterFlush7640 Limited warranty
17
10 Limited warranty
The seller named below makes the following warranty with respect to
Dometic MasterFlush Model 7640 only.
1. One year limited warranty
1A. This Limited Warranty will be in effect for one year from the date of
purchase.
1B. This Limited Warranty is made only to the First Purchaser (herein-
after called the “Original Purchaser”) who acquired the product for
Original Purchaser’s personal, family, or household-type use. The
Original Purchaser should retain a copy of the sales receipt or
invoice as evidence of the date of purchase because proof of
purchase is required to obtain warranty service.
1C. If this 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 90 days from the date of
purchase.
1D. This warranty covers all parts of the Dometic toilet which is
warranted to be free of defects in material and workmanship under
normal use. This warranty does not cover conditions unrelated to
the material and workmanship of the product. Such unrelated
conditions include, but are not limited to, (a) faulty installation and
any damage resulting from such; (b) the need for normal mainte-
nance and any damage resulting from failure to provide such
maintenance; (c) failure to follow Seller’s instructions for use of
this product, including failure which may result from not following
winterization procedures; (d) any accident that results in damage
to this product; (e) scratching or staining of any ceramic or plastic
component; (f) acts of God, or misuse of any part of this product
and any alteration by anyone other than the Seller.
1E. For Original Purchaser (ONLY) to obtain the benefits of this
Warranty during the 1-year period (for personal use) or 90-day
period (for commercial use), the following shall apply:

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Limited warranty MasterFlush7640
18
(a) Original Purchaser shall contact the local dealer from whom the
product was purchased; or contact the Seller Customer Service
Department at 1-800-321-9886 (8 a.m.-5 p.m. ET, USA) and
provide the local dealer or Seller Customer Service Department
with sales receipt or invoice, product model and serial number
from product. The product model identification label is located on
the back of the toilet bowl under the pump/base cover (see illu-
stration).
(b) If product, while still under warranty, is returned to local dealer
where purchased, the local dealer will repair, replace or refund the
product per this Warranty and as authorized by the Seller. Seller
will provide necessary replacement parts or product free of charge
to Original Purchaser, including freight on such replacement parts
or product, and Seller will pay direct labor charges for such repair
or replacement.
(c) Under no circumstances will Seller pay or be liable for any of
Original Purchaser’s or dealer’s travel charges or other expenses
associated with bringing the product or recreation vehicle to the
dealer for repair, for providing dealer with access to the product or
vehicle, or for downtime of the product or vehicle.

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MasterFlush7640 Limited warranty
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(d) Original Purchaser may be required to return defective product or
parts when requested by Seller; in such event, Seller will pay
related freight costs.
2. THE SELLER DOES NOT AUTHORIZE ANY PERSON OR COMPANY
TO CREATE OR EXTEND ANY WARRANTY OBLIGATIONS OR
LIABILITY ON ITS BEHALF.
3. REPAIR OR REPLACEMENT OF, OR REFUND FOR, DEFECTIVE
PRODUCT, AT SELLER’S OPTION, SHALL BE THE ORIGINAL
PURCHASER’S SOLE REMEDY UNDER THIS LIMITED WARRANTY.
IN NO EVENT SHALL SELLER BE LIABLE FOR PURCHASER’S
INCIDENTAL OR CONSEQUENTIAL DAMAGES. SOME STATES DO
NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR
CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR
EXCLUSION MAY NOT APPLY TO YOU.
4. SELLER DISCLAIMS ALL OTHER WARRANTIES WITH RESPECT TO
THE PRODUCT, WHETHER EXPRESS OR IMPLIED, AND SPECIFI-
CALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTA-
BILITY AND FITNESS FOR A PARTICULAR PURPOSE. SOME
STATES DO NOT ALLOW LIMITATIONS ON IMPLIED WARRANTIES
OR HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE
LIMITATION MAY NOT APPLY TO YOU.
5. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU
MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO
STATE.
Seller:
Dometic Corporation - Sanitation Div.
13128 SR 226
Big Prairie, Ohio 44611 USA
330-439-5550

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Technical data MasterFlush7640
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11 Technical data
11.1 Certificates
11.2 Materials
Toilet bowl: vitreous ceramic
Toilet seat: enameled wood
Toilet base: polypropylene
Macerator pump body: glass-filled polypropylene
Water valve: polypropylene
Foot pedal: polypropylene
Vacuum breaker: ABS/polypropylene
Floor flange seal: nitrile rubber, foam