Rinnai RH180 Specifications download pdf (Page 7)

Sequence of operation:

1. When the water temperature at the bottom of the tank (at the tank

thermistor) drops to a pre-determined temperature, the startup

sequence will begin.

2. The tankless engine’s combustion fan will begin turning, drawing

fresh air from the space. This will allow the flammable vapor sensor

to ensure the intake air is free of combustible vapors.

3. The pump will begin circulating water through the tank-tankless

loop.

4. The engine will fire when it detects the water flow from the pump.

5. The heated water from the engine will be deposited back into the

tank. The water will be directed toward the top of the tank close to

where hot water is being drawn into the plumbing system.

6. Initially as water is drawn from the tank into the engine, the Delta T

will be fairly large and the engine will operate in a high fire mode.

7. As the water at the bottom of the tank begins to heat, warmer

water will then begin to enter the engine — this will reduce the

Delta T allowing a higher flow rate through the engine.

8. As the water in the tank continues to warm and gets closer to the

set temperature, the tankless engine will automatically reduce its

gas input.

9. When the temperature at the bottom of the tank reaches the set

point, the pump turns off — the tankless engine will go into a

standby mode until the next start sequence.

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Rinnai RH180 Specifications Page 7