A.O. Smith Innovo IR 12-160, Installation, User And Service Manual

Page: 62 / 96

10.4 Error history
The control unit automatically stores data of occurred errors and failed actions of the water
heater. The error history can be used to analyse the water heater and to find the causes of
the errors and failed actions.
Use parameters
270
till
273
to read the errors. Use parameters
274
till
277
to read the
appliance history, refer to Parameters (see 10.2).
10.5 Test cycle
The test cycle can be used to activate the test modes. These test modes can, for example,
be used to set the CO2 value at full and at partial load or to check the air pressure
differential.
Use parameter
201
to activate the test cycle.
The test cycle is shown on the display. Each test setting can be recognized by the first
letter on the display.
Fig. Example
Hi
-setting test cycle Fig. Example
Lo
-setting test cycle
10.6 Legionella prevention
Use parameter
210
to activate the legionella prevention. When the anti legionella program
is activated, the water heater heats the water to the anti legionella setpoint. When the anti
legionella setpoint is reached, the temperature may not decrease more than 3 °C below
the anti legionella setpoint for 60 minutes. The anti legionella setpoint can be set with
parameter
209
.
The anti legionella program has 2 functionalities:
• "start-up" functionality: The anti legionella program starts when the water
temperature did not exceed the anti legionella setpoint within 2 hours after the water
heater is turned on.
• "normal" functionality: The anti legionella program starts when the water
temperature did not exceed the anti legionella setpoint for 7 days (168 hours).
Note
When you activate the anti legionella program, parameter
002
(setpoint ON mode) will be
overruled. The display will show the text
LEG
when the anti legionella mode is activated.
Note
When the water heater is heating the water, the current water temperature and the anti
legionella setpoint is shown alternately on the display.
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62 Installation, Maintenance and Service part