Maintenance 3 - Mira Advance ATL Installation & User Manual

The Mira Advance ATL then calculates the flow rate and power level, to keep
the outgoing temperature constant. This mode of operation requires the staged
power up and power down of individual heating elements. During this sequence
the user may hear a number of audible 'clicks' and the flow rate may change.
1.7. Low Pressure Thermostatic Performance (below 1 bar maintained)
If the supply pressure falls below 1 bar maintained the unit may switch off
elements to maintain the temperature. A reduced flow will be observed even
though the user selected flow indication remains unchanged.
Restoration of the original pressure condition will not automatically restore the
flow setting. This can be achieved (subject to restoration of adequate supply
pressure) by manually reselecting the desired flow condition (even though it is
still indicated).
1.8. Low Pressure Failure
The Mira Advance ATL contains a 'LOW PRESSURE' indicator which will
operate for three seconds, if the following conditions occur:
1.8.1. Low water pressure (below 0.5 bar maintained).
1.8.2. Blocked or partially blocked spray plate.
1.8.3. Blocked inlet filter.
If any of the above conditions occur, the unit will return to STOP.
1.9. The Mira Advance ATL contains a 'SERVICE' indicator which will operate if the
following conditions occur:
1.9.1. Abnormal operating conditions (refer to Maintenance)
1.9.2. Faulty element or element assembly.
1.9.3. Overheating
Depending on the fault condition the Advance ATL may continue to operate.
1.10. Check the shower temperature before entering the shower. The previous user
may have selected a different temperature or flow condition.
Temperature Rise Versus Flow for the Mira Advance ATL 8.7 & 9.8kW
60
50
40
30
20
10
9.8 kW
8.7 kW
0
2 3 4 5
Flow rate (litres per minute)
6 7 8 9
26
10