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List of Failures (HMI-SG controller) (continuation)
Failure
Description
Electric reheating
Water heater
pump
Water heating ad-
ditional antifreeze
protection (PMO)
Inlet fan
Inlet fan (air-
flow failure)
Outlet fan
Outlet fan (air-
flow failure)
Air flow sen-
sor (pressure)
- inlet fan
Air flow sen-
sor (pressure)
- outlet fan
Fan (inlet, outlet)
Fan (inlet, outlet)
– flow failure
Water pre-heating
Outlet tempera-
ture-dependent fire
alarm activation
Inlet temperature-
d e p e n d e n t f i r e
alarm activation
Fire alarm (external
failure)
Water heater re-
turn water
46
A
63
Electric after-heater failure - thermostat
A
65
Water heater pump failure - contact
A
65
Electric heating additional PMO - thermostat
A
66
Backup inlet fan error - thermo-contact
1.) Backup inlet fan error - flow sensor
A
66
2.) Single-speed fan error - flow sensor
A
67
Backup outlet fan error - thermo-contact
A
67
Backup outlet fan error - flow sensor
A
69
Unconnected or damaged air flow sensor (pressure) - inlet fan
A
70
Unconnected or damaged air flow sensor (pressure) - outlet fan
1.) Communication error between control unit and the inlet/outlet fan frequency inverter
(Modbus data bus) - inverter internal error; wrong settings of the frequency inverter data
points – bus communication protocol, data transfer rate, parity, number of stop-bits, com-
A
71
munication timeout; poor connection of the bus cable to the frequency inverter terminals;
bus terminal resistance settings on the last frequency inverter has not been performed.
2.) Inlet/outlet fan error - thermo-contact
1.) Lost communication between control unit and fan frequency inverter - inverter internal
error; wrong settings of the frequency inverter data points - bus communication protocol,
data transfer rate, parity, number of stop-bits, communication timeout; poor connection
A
72
of the bus cable to the frequency inverter terminals; bus resistance terminal settings on
the last frequency inverter has not been performed.
2.) Inlet/outlet fan error - flow sensor
1.) Temperature sensor disconnected or damaged
A
74
2.) Water temperature in the water heat exchanger return pipe > 140 °C, or water tem-
perature in the water heat exchanger return pipe < 5 °C
A
81
Fire alarm triggered due to exceeded pre-set outlet air temperature (data point 820)
A
81
Fire alarm triggered due to exceeded pre-set inlet air temperature is (data point 821)
1.) Fire alarm triggered by the fire dampers - contact
A
81
2.) External failure - contact
1.) Temperature sensor disconnected or damaged
A
82
2.) Water temperature in the water heat exchanger return pipe > 140 °C, or water tem-
perature in the water heat exchanger return pipe < 8 °C
Failure Causes
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