Sequence of operation:
7
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.
9.
6.
3.
5.
2.
8.
4.
7.
1.
Summary of Contents for RH180
Page 1: ...Rinnai RH180 Hybrid Tank Tankless Water Heater Installation Fundamentals Level II 1...
Page 3: ...3 RH180 Hybrid Tank Tankless Water Heater Level II Training Program Installation Fundamentals...
Page 6: ...RH180 Sequence of Operation 6...
Page 8: ...RH180 Water Heater Sizing 8...
Page 10: ...RH180 Product Features Safety devices 10...
Page 18: ...Dimensions 18...
Page 38: ...RH180 Temperature Controller 38...
Page 39: ...Temperature Controller 39...
Page 41: ...RH180 Maintenance and Warranty 41...
Page 49: ...Component Description 49...
Page 50: ...Component Description 50...
Page 61: ...RH180 FAQ 61...