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List of Failures (HMI-SG controller) (continuation)
Failure
Description
Electric heating
A
Electric reheating
A
Water heater
A
pump
Water heater
A
(auxiliary antifreeze
protection)
Inlet fan
A
Inlet fan (air-
A
flow failure)
Outlet fan
A
Outlet fan (air-
A
flow failure)
Flow (pressure)
A
sensor - supply fan
Flow (pressure)
A
sensor - ex-
haust fan
Fan (inlet, outlet)
A
Fan (inlet, outlet)
A
– air-flow failure
Water pre-heating
A
Outlet tempera-
A
ture-dependent fire
alarm activation
Inlet temperature-
A
dependent fire
alarm activation
Fire alarm (ex-
A
ternal fault)
Water heater
A
return water
62
Fault in the electric heating - thermostat
63
Fault in the electric reheating - thermostat
65
Fault in the water heating pump - contact issue
65
Additional frost protection for the water heating - thermostat
66
Fault in the supply auxiliary fan - thermal contact
66
1) Fault in the supply auxiliary fan - flow sensor
2) Fault in the single-speed fan - flow sensor
67
Fault in the exhaust auxiliary fan - thermal contact
67
1) Fault in the exhaust auxiliary fan - flow sensor
2) Fault in the single-speed fan - flow sensor
69
Unconnected or damaged flow (pressure) sensor - supply fan
70
Unconnected or damaged flow (pressure) sensor - exhaust fan
71
1) Communication error between the control unit and the frequency inverter
of the supply and exhaust fan (Modbus data bus) - internal error of the in-
verter; incorrectly set data points of the frequency inverter (communication
protocol, communication speed, parity, number of stop bits, communication
delay); improperly connected data bus cable to the terminals of the frequency
inverter; missing termination resistor on the last frequency inverter
2) Fault in the supply and exhaust fan - thermal contact
72
1) The control unit and fan frequency inverter are not communicating - internal
fault in the inverter, incorrect settings of the inverter's data points (communica-
tion protocol, communication speed, parity, number of stop bits, communica-
tion delay), improperly connected communication cable to the terminals of the
frequency inverter, missing termination resistor on the last frequency inverter
2) Fault in the supply, exhaust fan - flow sensor
74
1) Disconnected or damaged temperature sensor
2) The temperature of the water at the return of the water heat exchanger is > 140°C
or the temperature of the water at the return of the water heat exchanger is < 5°C.
81
Fire alarm triggered due to exceeding the set tempera-
ture (data point 820) of the exhaust air
81
Fire alarm triggered due to exceeding the set tempera-
ture (data point 821) of the supply air
81
Fire alarm triggered by fire dampers (external fault) - contact
82
1) Disconnected or damaged temperature sensor
2) Water temperature at the return of the water heat exchanger is >140°C
or water temperature at the return of the water heat exchanger is <8°C
Control units VCS
Failure Causes
47
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