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• Register 18: Operating hours fi lter/s for dirty fi lter/s indication (timer) [read/write].
− The value that is sent is the value of the hours (function disabled: 0001h to 9000h) in 16-bit binary.
Default value: 3000 [function enabled, and dirty fi lter / s indication with 3000 hours of operation].
Note: The indication of dirty fi lter/s per timer (operating hours) is disabled if this register has a value of 0, and
otherwise enabled.
• Register 19: Lock/unlock keyboard functions [read/write].
− 0: Keyboard unlocked.
1: Operation mode lock (MODE push button lock).
2: Total keypad lock.
Default value: 0 [Keyboard unlocked].
• Register 20: Time programming [read/write].
− 0: Time programming disabled.
1: Time programming activated.
Default value: 0 [Time programming disabled].
• Register 21: Fan speed display on display [read/write].
− 0: Display of fan speed on display is not allowed.
1: Yes, the display of fan speed on display is allowed.
Default value: 1 [Yes, fan speed display is allowed on display].
• Register 22: Cold/heat mode of operation and relay function [read/write].
Bit 15
Bit 14
− High byte: Cold/heat operation mode.
0: Cold (Bypass)
1: Not used
2: Not used.
Default value: 0 [Cold (Bypass)].
Bit 7
Bit 6
− Low byte: Relay function.
Bits 1 and 0: Relay 1 (no function, fans on/off, on/off bypass, alarm).
00: No function.
01: Start/stop fans.
10: Bypass.
11: Alarm.
Default value: 10 [Bypass].
Bits 3 and 2: Relay 2 (no function, fans on/off, on/off after heating, alarm).
00: No function.
01: Start/stop fans.
10: Postheating.
11: Alarm.
Default value: 01 [Start/stop fans].
Note [EEPROM]: The values of the read/write registers are saved in EEPROM each time they change value.
Registers of only read
• Register 23: Indoor temperature [read only].
− The value that is sent is the temperature value (0.0ºC to 50.0ºC) multiplied by 10 in 16-bit binary.
Ambient temperature sensor integrated in the regulator.
0,0°C: 0x0000.
50,0°C: 0x01F4.
In case of sensor failure (opening or short circuit), the data 0x7FF is sent.
Bit 13
Bit 12
Bit 5
Bit 4
Bit 11
Bit 10
Bit 3
Bit 2
Bit 9
Bit 8
Bit 1
Bit 0
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