Fuel Tank Installation - Toyotomi Oil Miser OM-180 Installation Manual

The fuel tank must be purchased separately and installed by a qualified fuel supply technician.
NOTE: Fuel tank installation must comply with National Fire Protection Association Code NFPA 31 or local-
ly applicable codes. Check with local building officials.
The following instructions should be followed for installation of a large capacity, gravity-fed fuel tank.
¡ Installation height of tank's fuel outlet should be at least 16 in. above floor surface upon which the water
heater rests.
¡ To avoid excess fuel pressure to water heater, the top of fuel tank should be no more than 8-1/2 ft. above
the bottom of the unit.
¡ The inlet fuel pressure must not exceed 2.5 PSI. If the inlet pressure exceeds 2.5 PSI, a pressure reducer
(Part #10005099) must be used.
¡ Fuel tank should be located at least 6 ft. away from all heat sources.
¡ 3/8" OD copper tubing should be used for the fuel line.
¡ To prevent air locks in the fuel line, the fuel line should be smooth with no inverted U-shaped line or
sharp bends.
¡ Install a UL listed fuel filter at the fuel tank outlet. Shut-off valves should also be installed on the fuel line
and connected to the tank as shown below. Unit should have a separate fuel line from fuel tank.
NOTE: An additional shut-off valve installed next to the exterior wall will minimize the amount of fuel to be
drained should the water heater need to be disconnected. If the valve is inside the building, a
fusible link type (Part #10005597) is recommended.
1. All external tank must be vented.
2. Install a UL listed fuel filter at the fuel tank outlet.
Specifications required of this fuel filter are as follows:
Type of Fuel: ASTM D3699 1-K kerosene, ASTM D396 Low Sulfre No. 1 or No. 2 Fuel Oil, or ASTM D975
Ultra Low Sulfur Diesel (ULSD)
Rated Filtering Capacity: 2 GPH (Minimum)
3. The fuel supply tank must be positioned as to allow gravity feed to the unit and high enough to reduce
trapped air in the fuel line. Please refer to Section "D", page 8 in the Operation and Maintenance
Instructions for the procedure to remove trapped air. (✽)
NOTE: If the maximum height is exceeded, a fuel pressure limiting valve is required. Part No.
10005099 has 3/8 in. (N.P.T.) inlet and outlet female openings to accept the fuel line fittings.
NOTE: Fusible Link Valve (#10005597)
¡It is most important that the valve, depending on its use, be fully opened or fully closed.
¡The top nut on the valve (below the turn handle) is sealed and should never be tightened or
¡When installing fuel lines to the valve, be sure to check for fuel leakage.
¡A LEAKING VALVE SHOULD ALWAYS BE REPLACED.
5

FUEL TANK INSTALLATION

removed.
Fusible link valve
Shut-off valve
Fuel filter
8-1/2 ft. maximum
( ✽ )
Loop
3/8in. OD copper tubing
Outdoor fuel tank
Tank vent
Shut-off valve