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8. If the ON/OFF SWITCH or On Demand CONTROL CENTER are left in the ON
position, no further action is required by the user.
9. If the water heater fails to light for any reason, a second Trial For Ignition(TFI)
will automatically begin. If the second Trial For Ignition(TFI) fails, the water
heater will automatically begin a third Trial For Ignition(TFI). If the third Trial For
Ignition(TFI) fails, the water heater will go into a lock out mode and will not try to
light the burner again. To reset:
a. Using ON/OFF SWITCH: Turn Switch OFF then back ON.
b. Using the On Demand CONTROL CENTER: Turn faucet OFF, then back on.
NOTE: The NAUTILUS (IW60) On Demand WATER HEATER has an energy mode
circuit that will shut down operation if operating continuously for three (3) hours. To
reset, follow the instruction in STEP 9 A or B above.
NOTE: Air in the gas line after changing propane tanks is the main reason for not
lighting the burner. A simple method to remove air from the gas line is to ignite a
burner on the installed cooking appliance inside your RV.
OPERATING FAUCETS AND SHOWER WITH THE
NAUTILUS (IW60) ON DEMAND WATER HEATER
A. All faucets must be operated the same as you would in your home.
B. Unit thermostat is set at 120°F at the factory. Cold water must be added to
achieve the desired hot water temperature.
1. If this is the first use of the unit for the season, turn water supply on and open
each faucet and allow all air to be purged from the water lines.
2. Turn ON power supply.
3. Turn ON propane supply. Hot water faucet may have to be cycled several
times to purge gas supply.
C. The water heater only heats when there is a call for water (open hot water faucet).
D. A minimum of 0.5 gallons per minute is required for water heater to operate.
E. Faucet should be turned on and adjusted to desired temperature and flow before
entering shower.
F. Showerhead button should NOT be used. Using the showerhead button will
create a drop in temperature by reducing or stopping the flow of water through
the water heater causing the water heater to shut down.
G. Flow restrictors in faucets and shower heads should be removed for best
performance.
TO TURN OFF THE ON DEMAND WATER HEATER
1. Turn switch to "OFF" position for units using the Switch and Light Assembly.
2. For units using the optional On Demand CONTROL CENTER, press the power
button once.
3. Turn off electrical power to the appliance.
4. Turn off gas supply.
5. If vehicle is to be stored or heater is going to be turned off while subject to freezing
temperature, drain water heater. (See "Draining and Storage Instructions.")
OPERATIONAL TROUBLESHOOTING
CAUTION
For your safety, ALL repairs and/or maintenance of unit
should be performed by your dealer or a qualified service
technician.
NOTE: There must be a demand of at least 0.5 GPM for the burner to operate and
allow water flow. This will continue until the water flow is turned OFF and the system
goes dormant.
NO WATER FLOWS FROM FAUCET WHEN TURNED ON:
1. Be sure water supply is turned ON and there are no water restrictions.
BURNER TURNS ON, TEMPERATURE FLUCTUATES ERRATICALLY:
1. This issue can be caused by restriction in the shower heads, faucet aerators or
water strainers.
2. Clean as required and remove any flow restrictions.
ON DEMAND HEATER COMES ON AND RAPIDLY CYCLES ON AND OFF:
1. Water flow is too low. Increase flow at faucet.
2. Clean all shower heads, faucet aerators or water strainers as required and
remove any flow restrictions to assure the minimum 0.5 GPM of water flow.
3. Verify the water pump is functioning properly.
4. Bleed air out of plumbing lines by opening all water faucets.
5. If the On Demand water heater cycles as the pump cycles, an accumulator tank
is needed in the water system. If accumulator tank is already installed, check for
water inside the tank and drain tank until only air is present.
6. Water source pressure fluctuates too low causing loss of flow. Check the
incoming water source for a minimum of 30 psi.
WATER TEMPERATURE IS TOO LOW WITH LOWER WATER FLOW:
1. Water flow is too low. Increase flow at faucet to assure the minimum 0.5 GPM
of water flow.
WATER TEMPERATURE IS TOO HIGH OR NO TEMPERATURE CONTROL:
1. For units with the Standard Switch and Light assembly, adjust the dip switches
to the desired temperature.
Refer to OPERATING INSTRUCTIONS WITH
SWITCH AND LIGHT ASSEMBLY and see Figure 12 for information on setting
dip switches to desired temperature setting.
2. For units using the optional On Demand CONTROL CENTER, press the UP or
DOWN arrows on the On Demand CONTROL CENTER to increase the SET
water temperature in single increments. Refer to OPERATING INSTRUCTIONS
WITH OPTIONAL ON DEMAND CONTROL CENTER and see Figure 13.
LOW TEMPERATURE RISE AND EXCESSIVE WATER FLOW REQUIRED TO
TRIGGER THE ON DEMAND WATER HEATER:
NOTE: If you find that your water heater requires excessive flow to activate it (over
0.5 GPM), it is possible that you have COLD water bleeding into the HOT water side
of your water system.
1. Verify that valves and faucets are closed when not in use. Check the shower
head for an ON/OFF button/lever and ensure it is in the OFF position to prevent
cold water from bleeding into the hot water system. This can keep the On
Demand water heater from functioning correctly.
2. If your RV is equipped with a bypass valve at the water plumbing connection,
make sure it is in the OFF position. An open valve can allow water to bypass
water heater causing a failure to ignite.
NO IGNITION:
If the burner will not come on, the following items should also be checked before
calling a service technician:
A. Switch turned off.
B. 12 VDC power is ON
C. Gas supply to heater is empty or turned off.
D. Water turned on and faucet open.
E. Check manual reset on ECO switch. Refer to DETAIL "A" in Figure 9.
If burner fails to light, call a Suburban service center or a local RV service agency.
MAINTENANCE
WARNING
If the user of this appliance fails to maintain it in the
condition in which it was shipped from the factory or if
the appliance is not used solely for its intended purpose
or if appliance is not maintained in accordance with the
instructions in this manual, then the risk of a fire and/
or the production of carbon monoxide exists which can
cause personal injury, property damage or loss of life.
For your safety, all repairs should be performed by your
dealer or a qualified service person.
A. Periodically inspect unit for soot. If soot is present anywhere on water heater,
immediately shut unit down and contact your dealer or a qualified service person.
Soot is a sign of incomplete combustion and must be corrected before operating
water heater. Areas to check would include:
1. Check for an obstruction in vent cap.
2. Check vent to see that no foreign material has accumulated to prevent flow of
combustion and ventilating air.
3. Check to be sure there is no flame present at burner orifice or burner
whenever main gas valve is closed. This can be checked by turning the ON/
OFF switch to the "OFF" position.
B. Periodically check wiring and wire connections to be sure wiring is not damaged/
frayed and that all terminals and connections are tight and in compliance with
codes (See "Making Electrical Connections").
DRAINING AND STORAGE INSTRUCTIONS
If RV is to be stored during winter months, the water heater system must be drained
to prevent damage from freezing.
1. Turn off electrical power to water heater either using the switch, the On Demand
control center or by removing the fuse.
2. Shut off gas supply to water heater.
3. Turn off pressure pump on water system.
4. Open both hot and cold water faucets.
5. Remove Service Panel to access system drain valve.
6. Turn drain valve knob clockwise to drain.
7. Follow RV manufacturer's instructions for draining entire water system.
NOTE: System will have to be refilled with water and all air removed from lines before
unit will re-light.
NOTE: All water must be drained to the outside of the RV - Drain lines must be
connected to the system and condensation drains on the water heater and ran to the
outside of the RV. Drain Lines should be as short as possible and must maintain a
drop of ¼" per foot from unit. See Figure 10.
WINTERIZING
1. Follow RV manufacturer's instructions for draining entire water system.
2. Once drained, RV NON-TOXIC antifreeze can be added if recommended by
your coach manufacturer.
FREEZE PROTECTION
The NAUTILUS (IW60) On Demand water heater has built-in FREEZE PROTECTION
and will intermittently cycle the burner when the water temperature has fallen below
40°F(4.4°C). This intermittent cycling will continue until the water temperature has
risen above 50°F(10.0°C). To provide this freeze protection, the gas supply must be
on, gas must be available and electrical power must be on.
If the On Demand Water Heater is dripping water into the drain line, in cold weather,
when the water supply temperature is below 38°F and does not stop when the water
temperature rises above 38°F, call your local service center. The valve may be
disabled by turning the needle valve located on the front of the On Demand Water
Heater 5 and 1/2 turns clockwise. Closing the valve will disable the mechanical
freeze protection feature. The water system must be drained when not in use to
avoid damage caused by ice expanding in water lines if valve is closed.
5
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