Bit0: On/Off - Flame Signal
Bit1: Ok/Nok - Water level
Bit2: Ok/Nok - Low gas pressure
Bit3: Ok/Nok - High gas
pressure
Bit4: On/Off - Air pressure
Bit5: Ok/Nok - Blocked flue
Bit6: On/Off - Air damper Bit7:
NOTES:
1. Writing to a “write-able” point of an AM Series boiler or heater is a two-step process. First the
“Control Register” must be written with a 1 (bit 0 = 1), and then the desired register can be
written.
2. A controller may also be reset after a lock out error by setting bit 14 of the Control Register.
3. When no Modbus communication (reading or writing) is sensed for more than 4.0 seconds,
the Control Register bits will be reset. The bits will also be reset when undefined bits (i.e. other
than bits 0 and 14) are set.
CAUTION!
Writing of parameters (registers) with a different value is limited to 10,000 times. All
(CH, DHW) setpoints and parameters are for preset only. They can be changed with
an average of two changes per day, but are NOT to be used for dynamic
temperature control.
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General