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IMPORTANT: Use a pipe thread compound suitable for potable water or pipe thread
tape on all connections to assure they will not leak.
B. For ease of removal, it is suggested that a pipe union be installed in each water line.
C. Fill system with water. Open both hot and cold water faucets to expel air from
system. When system is filled and water flows from faucets, close both faucets
and check all connections for leaks.
CAUTION
If you use air pressure to check for leaks, the
pressure must not exceed 30 PSI in accordance with
NFPA 1192.
NOTE: After leak testing, drain water from system. See Figure 10. Please refer to
the DRAINING AND STORAGE INSTRUCTIONS in this manual for draining water
from the system.
MAKING GAS CONNECTIONS
A. Connect a 3/8" gas supply line to the 3/8" flare fitting at gas valve. When
making the gas connection, hold the gas fitting on the valve with a wrench when
tightening the flare nut. Failure to hold fitting securely could result in a gas leak
due to fitting being damaged.
B. Turn on gas and check all fittings and connections for leaks using a soap and
water solution. Correct even the slightest leak immediately.
NOTE: When replacing your water heater with an NAUTILUS (IW60) On Demand
water heater, review your gas regulator to ensure it can maintain a proper gas
flow during the operation of the On Demand water heater and other gas burning
appliances.
NOTE: Regulator switch over pressure may be lower than main operating pressure.
Maximum Capacity of Pipe in Cubic Feet of Gas per Hour for Gas Pressures of
0.5 PSIG or Less and a Pressure Drop of 0.3 Inch Water Column
INTENDED USE:
Tubing sizing between single or second-stage (low pressure) regulator and appliance.
Nominal:
K & L:
1/4
Nominal:
ACR:
3/8
Outside Diameter:
0.375
Inside Diameter:*
0.305
Length (feet)
Capacity in Thousands of BTU per Hour
10
45
20
31
30
25
40
21
50
19
*Table capacities are based on TYPE K copper tubing I.D.
WARNING
Do not use an open flame to check for leaks!
OPERATING SAFETY INFORMATION
FOR YOUR SAFETY READ BEFORE LIGHTING
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.
If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal
injury or loss of life.
A. This appliance does not have a pilot. It is equipped with an ignition device which
automatically lights the burner. Do not try to light the burner by hand.
B. BEFORE OPERATING, smell all around the appliance area for gas. Be sure to
smell next to the floor because some gas is heavier than air and will settle on the
floor.
•
Evacuate all persons from the vehicle.
•
Shut off the gas supply at the gas container or source.
•
Do not touch any electrical switch, or use any phone or radio in the vehicle.
•
Do not start the vehicle's engine or electric generator.
•
Contact the nearest gas supplier or qualified service technician for repairs.
3/8
1/2
5/8
1/2
5/8
3/4
0.500
0.625
0.750
0.402
0.527
0.652
93
188
329
64
129
226
51
104
182
44
89
155
39
79
138
•
If you cannot reach a gas supplier or qualified service technician, contact the
nearest fire department.
•
Do not turn on the gas supply until the gas leak(s) has been repaired.
C. This unit has an automatic gas valve, no adjustments are necessary. Do not
attempt to repair the gas valve. This may result in a fire or explosion.
D. Do not use this appliance if any part has been under water. Immediately call a
qualified service technician to inspect the appliance and to replace any part of
the control system and any gas control which has been under water.
E. Before operating water heater, check the location of the vent to make sure it will
not be blocked by the opening of any door on the trailer. If it can be blocked, do
not operate the water heater with the door open.
OPERATING INSTRUCTIONS
WITH SWITCH AND LIGHT ASSEMBLY
1. STOP! Read the safety information above.
2. Turn off all electric power to the appliance.
3. Turn "OFF" gas supply.
4. Wait five minutes for gas to clear the area. If you smell gas then STOP! Follow
instructions in item B of the OPERATING SAFETY INFORMATION. If you do
not smell gas, go to next step.
5. Turn "ON" gas supply.
6. Turn on electrical power to the appliance.
7. Turn switch that operates the water heater to "ON" position. The switch is
illustrated in Figure 12. Your Switch may be different in appearance and is
located somewhere inside the RV. The water heater operates based off of
"flow." There must be a hot water faucet OPEN to a minimum of 0.5 GPM for the
unit to operate. If the burner does not light, the system will automatically attempt
two more tries for ignition before lock-out. When light remains illuminated, the
system is in lockout.
8. If lockout occurs, unit must be re-cycled by turning the faucet OFF or turning
the switch OFF and then back ON. The first start-up of the heater may require
several ignition cycles before all air is purged from the gas lines.
This On Demand Water Heater is factory set at 49°C/120°F. To change the water
temperature settings, you will need to access the front of the water heater.
1. Remove the SERVICE PANEL as shown in Figure 9.
2. Locate the set of four (4) dip switches located on the module board and refer to
Figure 12 for information on setting dip switches to desired temperature setting.
WARNING
Dip switches numbered 1 and 2 are not to be moved from
factory setting.
OPERATING INSTRUCTIONS WITH OPTIONAL
ON DEMAND CONTROL CENTER
1. STOP! Read the safety information above.
2. Turn off all electric power to the appliance.
3. Turn "OFF" gas supply.
4. Wait five minutes for gas to clear the area. If you smell gas then STOP! Follow
instructions in item B of the SAFETY INFORMATION. If you do not smell gas,
go to next step.
5. Turn "ON" gas supply.
6. Turn on electrical power to the appliance.
7. PRESS THE "ON" button. The On Demand CONTROL CENTER is illustrated in
Figure 13. Your On Demand CONTROL CENTER is located somewhere inside
the RV. The water heater operates based off of "flow." There must be a hot water
faucet OPEN to a minimum of 0.5 GPM for the unit to operate. If the burner does not
light, the system will automatically attempt two more tries for ignition before lock-out.
8. If lockout occurs, and ERROR CODE will be displayed on the On Demand
CONTROL CENTER and the unit must be re-cycled by turning the faucet OFF
or by pressing the OFF button on the On Demand Control Center and then back
ON. The first start-up of the heater may require several ignition cycles before all
air is purged from the gas lines.
This On Demand Water Heater is factory set at 49°C/120°F. To change the water
temperature settings:
1. Press the UP or DOWN arrows on the On Demand CONTROL CENTER to
increase or decrease the SET water temperature in single degree increments.
The water temperature set range is 35°C/95°F to 54°C/130°F. See Figure 13.
SEQUENCE OF OPERATION
The following Sequence of Operation will be the same when using either the
ON/OFF SWITCH or the optional On Demand CONTROL CENTER.
1. Turning on a hot water faucet activates the On Demand Water Heater.
2. The water heater senses the flow of water.
3. The water heater proves that the combustion air fan is working.
4. The combustion chamber is then purged of any remaining raw gas.
5. The burner will ignite and prove the flame.
a. The approximate time from turning on the faucet to ignition is 7 seconds. After
the initial lighting sequence and the water heater is maintaining temperature,
the ignition cycle is reduced to approximately 5 seconds.
b. Burners will stay ON until the water flow is shut off.
6. The flow of hot water at the SET point begins approximately 3 seconds after
ignition but will not reach the faucet until the hot water lines leading to the faucet
are cleared of any remaining water. This time is determined by the length of the
hot water line.
7. When the hot water faucet is turned OFF, the water heater shuts down and will
remain in a ready state until hot water is called for again.
NOTE: Blower motor will operate for approximately 20 seconds after the hot water
faucet is turned OFF.
4
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