SystemAir Sense SNX, Installation,Operation And Maintenance Instruction, Page: 18 / 28

18
Code Alarm
class Name/Description Source Plant lock BACnet object /
Comment
Influence of alarm Solution
1001 A Supply air temperature,
sensor fault
System Stop TSu Shutdown AHU Check connection of sensor and
replace if needed
1002 A/B Exhaust air
temperature, sensor
fault
System Run TEh, active only if sen-
sor available
Shutdown AHU / No heat
exchanger supervision
possible
Check connection of sensor and
replace if needed
1003 B Extract air temperature,
sensor fault
System Run TEx, active only if
sensor available
Fallback to room temper-
ature control or supply air
control
Check connection of sensor and
replace if needed
1004 A/B Outside air
temperature, sensor
fault
System Conf. TOa Shutdown AHU / fallback
to default
Check connection of sensor and
replace if needed
1005 A Frost protection
temperature for
heating coil, sensor
fault
System Stop TFrPrtHcl, active only if
HclHw selected
Shutdown AHU, Frost
protection mode
Check connection of sensor and
replace if needed. Check if there
is hot water in pipe system.
1006 B Relative humidity for
extract air, sensor fault
System Run HuRelEx, active only if
sensor available
Stop Humidity control if
all sensors fail
Check connection of sensor and
replace if needed
1009 A Fire damper, position
feedback fault
Process Stop FdpFb, active only
if Fdp selected.
Plausibility check of
fire damper position
feedback
Shutdown AHU Check if fire alarm signal is
connected. Check polarity of
that signal.
1012 B Room temperature,
sensor fault
System Run TR with POS8/QMX3 Fallback to extract
temperature control or
supply air control
Check connection of sensor and
replace if needed
1013 B Room air quality,
sensor fault
System Run AQualR with QMX3 or
PmR
Stop air quality control if
all sensors fail
Check connection of sensor and
replace if needed
1014 B Extract air quality,
sensor fault
System Run PmR or AQualR,
Particulate matters, Air
quality
Stop control if all sensors
fail
Check connection of sensor and
replace if needed
1015 B Cooling coil DX
evaporator fault
Process Run CclDxFlt (BI, active only
if CclDx selected
Switch off cooling device Check if there is alarm on DX
unit. Check polarity of that
signal.
1017 B Room air humidity,
sensor fault
System Run HuRelR, if configured
on QMX
Stop Humidity control if
all sensors fail
Check connection of sensor and
replace if needed
1018 A/B Supply air temp. after
preheating coil, sensor
fault
System Run TSuAfPreHcl, active
only if sensor available
Shutdown AHU /
Shutdown electric
preheating coil, fallback
value for heat exchanger
efficiency
Check connection of sensor and
replace if needed
1019 B Flow temperature
preheating coil, sensor
fault
System Run TFlPreHcl, active only if
sensor available
Fallback to default value Check connection of sensor and
replace if needed
1020 B Air filter, dirty Process Run Operating hours of air
filter exceeds limit or
delta P, active only if
FilA selected
No reaction Check if filters are clean, if not
replace filters with new ones.
1021 B Supply air temperature
after heat exchanger,
sensor fault
System Run TsuAfHExg, active only
if sensor available
Fallback value for Hexg
efficiency calculation
Check connection of sensor and
replace if needed
1031 A/B/n Heat Exchanger fault Process Run RotHExgFlt or
HExgCdnMon (BI)
Shutdown AHU / Bypass
or shutdown HExg / no
reaction
Check if bypass damper of Heat
Exchanger is opening. Replace
acuator if needed.
1032 B Supply air pressure,
sensor fault
System Run PSu, active only if
VntCtl12 selected
Fallback to extract air
control, linear fan speed if
all sensors fail
Check connection of sensor and
replace if needed.Check if tubes
are mounted correctly.
8. Troubleshooting