Winterization and storage
When a Dometic toilet is stored for long periods of time or may be exposed to temperatures below
freezing, the toilet must be winterized or stored according to one of the following procedures.
Caution
This toilet is not intended for use when exposed to temperatures below freezing.
Caution
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.)
Storage options
Non-toxic Antifreeze Winterization
(recommended method)
1. Pour antifreeze in potable water tank according to instructions from antifreeze manufacturer.
2. Flush toilet several times until antifreeze has flowed completely through toilet. For toilets with
hand sprayer, the hand sprayer must be turned on to assure antifreeze is cycled through the
sprayer.
Drain Water from Toilet
1. Turn off water supply to toilet.
2. Remove water supply line from water valve.
3. Place a small container under water valve inlet to catch draining water.
4. Press flush pedal and allow water to completely drain from water valve and vacuum breaker.
5. Leave water line disconnected until threat of freezing temperature is past.
Note
Never leave vehicle or premises unoccupied for extended periods of time with municipal
water supply or onboard water pump turned on when there is a possibility of freezing
temperature.
IMPORTANT:
Toilet warranty does not cover freeze-damaged water valve
The Dometic 300, 310 and 320 series toilet warranty expressly excludes coverage for any damages
to the toilet or vehicle that may occur as a result of improper winterization of the toilet.
An indicator
of improper winterization is freeze damage to the water valve which results in leaks.
Dometic toilet water valves exceed maximum water
pressure as defined by North American plumbing
code agencies. However, if trapped water freezes in
piping that supplies water to the toilet, it expands
and creates extremely high pressure that can
damage the valve (see photo). To avoid this,
winterize the toilet as described in this manual.
If freeze-damage occurs as a result of improper
winterization, replace the water valve with a
300/310/320 series toilet water valve kit, part
number 385311641.
IF WATER VALVE IS
RETURNED FOR WARRANTY CLAIM, DOMETIC
RESERVES THE RIGHT TO DENY CLAIM IF
PROBLEM IS CAUSED BY FREEZE DAMAGE.
Fig.
6
A – Freeze Damage Indicator Window: white stress marks indicate freeze damage
B – Water valve damage due to severe exposure to below-freezing temperature
A
B
6
1
3
4
5
2
A
A
A
B
C
D
E
G
H
I
J
F
A
B
C
B
C
E
G
F
D
B
C
D
E
F
Specifications
Materials
Toilet bowl:
vitreous ceramic (models 310, 311,
Foot pedal:
polypropylene
Water valve:
polypropylene
Vacuum breaker:
ABS/polypropylene
Floor seal:
nitrile rubber, foam
320, 321); polypropylene (models 300, 301)
Toilet seat:
polypropylene (models 300, 301, 310,
311); enameled wood (models 320, 321)
Flush ball seal:
nitrile butyl rubber
Toilet base:
polypropylene
Minimum installation requirements
Water
Supply
Fitting
0.5 in. NPT
Flow rate
3.0-5.0* gpm / 11.4-18.9 lpm recommended
2.0 gpm / 9.5 lpm minimum
Static pressure
30-100 PSI / 206.8-689.5 kPa
Discharge
Floor flange
3 in./76 mm ID, 1/4 - 7/16 in. thick
* Water supply that exceeds 5.0 gpm/18.9 lpm may require a flow restrictor at toilet inlet.
Specifications subject to change without notice.
Toilet Dimensions
(fig.
2
)
All dimensions may vary ±3/8 inch (10 mm)
Ref.
Dimensions – Standard-height toilets
Model 300
Model 310
Model 320
A
19.75 in. / 502 mm
20 in. / 508 mm
19.75 in. / 502 mm
B
16 in. / 406 mm
15 in. / 381 mm
14.75 in. / 375 mm
C
19.75 in. / 502 mm
19 in. / 483 mm
22 in. / 559 mm
D
18.25 in. / 464 mm - seat height
18 in. / 457 mm - seat height
18.25 in. / 467 mm - seat height
E
13.25 in. / 337 mm
14.75 in. / 375 mm
16 in. / 406 mm
F
33.5 in. / 851 mm - seat lid up
33 in. / 838 mm - seat lid up
35 in. / 889 mm - seat lid up
Ref.
Dimensions – Low-profile toilets
Model 301
Model 311
Model 321
A
15.5 in. / 394 mm
15.25 in. / 387 mm
15 in. / 381 mm
B
16 in. / 406 mm
15 in. / 381 mm
14.75 in. / 375 mm
C
19.75 in. / 502 mm
19 in. / 483 mm
22 in. / 559 mm
D
14 in. / 356 mm - seat height
13.75 in. / 349 mm - seat height
13.5 in. / 343 mm - seat height
E
13 in. / 330 mm
14.75 in. / 375 mm
15.75 in. / 400 mm
F
30 in. / 762 mm - seat lid up
29.5 in. / 749 mm - seat lid up
31 in. / 787 mm - seat lid up
Rough-in dimensions
(fig.
3
)
Ref.
Dimensions/Description
Model 300
Model 301
Models 310, 311
Models 320, 321
A
8.5 in. / 216 mm
8.75 in. / 222 mm
10 in. / 254 mm
11 in. / 279 mm
B
11 in. / 279 mm
C
11 in. / 279 mm
D
Floor flange
E
Left wall
F
Back wall
G
Right wall
Components
(fig.
1
)
Ref.
Description
A
Toilet seat
B
Flush ball seal
C
Toilet bowl
D
Toilet base
E
Flush pedal
F
Floor flange seal
Ref.
Description
G
Vacuum breaker cover (310 only)
H
Vacuum breaker
I
Water valve
J
Floor mounting hardware kit
Refer to complete parts list (available online at
www.dometic.com) for additional information.
Installation
Note
Be sure foot pedal, when pressed, touches same flat surface on which toilet is installed.
Note
Be sure to follow recommended installation requirements in this manual.
Tools required
• pliers or adjustable wrench
• 7/16-in. / 11 mm wrench
Toilet installation
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.
3
A) for your toilet model (see
Rough-in dimensions
chart). 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 located at the correct
angle (fig.
3
D). Floor flange must be secured to floor with a minimum of four screws
(8 is preferred). Insert two supplied T-bolts into slots in floor flange (fig.
4
).
3. Verify that floor flange seal is installed on base of toilet (fig.
5
A). Carefully set toilet over floor
flange. 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.
Note
Entire toilet base does not rest completely on floor yet. Floor seal must be compressed in
following steps.
4. Install floor mounting nuts and washers onto T-bolts. Carefully torque nuts to 30-40 inch-pounds.
DO NOT OVERTIGHTEN. Alternate 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.
5
B)
5. If toilet is being installed in a shower stall, apply a bead of caulk around base of toilet to prevent
water seepage under base.
6. Connect water supply line and torque connection to 30-40 inch-pounds (fig.
5
C).
DO NOT OVERTIGHTEN.
NOTE: Model 301 toilet may require 1/2-in. elbow fitting or adapter.
7. Turn on water supply line. Flush toilet several times and check for leaks.
Troubleshooting
Problem
Possible Cause
Service Instruction
1. Water will not stay in bowl.
a. Ball seal is not properly
positioned.
b. Flush ball or seal is dirty.
c. Worn or damaged flush ball seal.
a. Press pedal to hold flush ball
open, then lightly press down
around edge of ball seal with
finger to conform to flush ball.
b. Clean flush ball and seal.
c. Replace seal.
2. Odor emits from toilet when
flush ball is open.
a. Plugged holding tank vent.
b. Odor from holding tank contents.
a. Clear obstruction from vent.
b. Add deodorant to holding tank.
3. Odor emits from toilet when
flush ball is closed.
a. No water in bowl.
b. Damaged flush ball seal.
c. Damaged floor flange seal.
a. Add water to bowl.
b. Replace seal.
c. Replace floor seal.
4. Flush ball will not close
completely.
a. Too much friction between flush
ball and seal.
a. Clean and lubricate flush ball
and seal with silicone spray or
furniture polish.
5. Water flow into toilet will not
stop.
a. Worn or defective water valve.
a. Replace water valve.
6. Water does not enter toilet bowl
properly.
a. Insufficient water flow rate at
toilet inlet.
b. Screen at water valve inlet is
clogged.
c. Water valve is worn or damaged.
d. Plugged rim wash holes or rim
jet (300 series only) in toilet.
a. Make sure flow rate at toilet inlet
is 3.0-5.0 gpm / 11.4-18.9 lpm
(recommended rate).
b. Clean screen.
c. Replace water valve.
d. Clean rim wash holes.
7. Hand sprayer leaks (hand
sprayer is not provided with
all models).
a. Hand sprayer is defective.
a. Replace hand sprayer.
8. Water is leaking from water
valve.
a. Water line connection is loose or
not seated properly.
b. Water valve is damaged or
defective.
a. Insure that threads are not
cross-threaded and tighten
connection.
b. Replace water valve.
9. Water is leaking from toilet base.
a. Toilet is not secure to floor.
b. Worn or defective floor flange
seal.
a. Tighten toilet mounting bolts.
b. Replace floor flange seal.
10. Water is leaking from rear of
toilet.
a. Loose vacuum breaker.
b. Damaged or defective vacuum
breaker.
c. Cracked or defective toilet bowl.
a. Make sure vacuum breaker stem
is pushed fully into sealing
grommet in back of bowl (310
and 320 series), or securely
connected to rim jet (300 series).
b. Replace vacuum breaker.
c. Replace toilet.
Dometic is a customer-driven, world-leading provider of leisure
products for the RV, automotive, truck and marine markets. We supply
the industry and aftermarket with a complete range of air conditioners,
refrigerators, awnings, cookers, sanitation systems, lighting, mobile
power equipment, comfort and safety solutions, windows, doors and
other equipment that make life more comfortable away from home.
Dometic supplies a wide range of workshop equipment for service
and maintenance of built-in air conditioners. Dometic also provides
specially designed refrigerators for hotel rooms, offices, wine storage
and transport and storage of medical products.
Our products are sold in almost 100 countries and are produced mainly
in wholly-owned production facilities around the world.
REVISION A
Form No. 600346504 6/17
©2017 Dometic Corporation
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
