Rinnai Advance Specifications download pdf (Page 8)

When the need for hot water arises by turning on a shower,

washing machine, dishwasher or faucet, cold water enters the

Rinnai Tankless Water Heater from the inlet pipe at the bottom of

the unit. The PC board is then signaled to activate the ame igniter

or ignition.

A combustion fan turns on to allow oxygen into the burner to

ignite the ame as the gas control valve opens at a low frequency.

Once an adequate ame is present the igniter stops sparking —

beginning the next sequence of operation in a matter of seconds.

Water is heated as it passes through the coils of the copper

heat exchanger, and exits from the hot water outlet pipe to travel

through the pipes of the home or business to the water xture

where hot water is needed. For Condensing models, the water is

preheated as it passes through a secondary stainless steel (latent)

heat exchanger, capturing any extra heat (or latent heat) before it

escapes into the vent system.

The gas valve and blower automatically adjust the incoming gas

and oxygen to meet the water heating demands. If the demand is

small, the Rinnai Tankless Water Heater can use a smaller ame

and less gas. If the demand is greater, the ame can expand across

the width of the entire burner to heat more water. The tankless

water heater adjusts as needed to ensure the temperature set

point is maintained. A digital controller allows the user to choose

his desired temperature.

As the hot water xture shuts off, cold water stops entering the

tankless water heater and the ame diminishes. The combustion

fan continues to operate at a low speed for a short period of time.

This allows the exhaust of any leftover combustion gases.

How a Rinnai Tankless Water Heater Works

RINNAI TANKLESS WATER HEATER OPERATION

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Rinnai Advance Specifications Page 8