C7355A ROOM IAQ MONITOR
11
31-00434—01
MAINTENANCE & FAULT CHECK
Maintenance
To ensure accurate C7355A data, regular maintenance is
required in normal use environments. Depending on the
environment in which it is used, maintenance is usually
required once every 3 to 6 months. Public places with high
concentration of dust, dry seasons, pollen seasons, and
poor environmental cleanliness can shorten the
maintenance period.
General maintenance includes: cleaning the filter using a
vacuum cleaner to remove dust inside the filter.
Fault Check
If a fault occurs in a normal use environment, see Table 5
to troubleshoot. If the fault cannot be eliminated, contact
the dealer or the manufacturer.
Waste Electrical and Electronic
Equipment (WEEE)
FCC Part 15 compliant
This device complies with part 1 5 of the F C C Rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2)This device must accept any interference received,
including interference that may cause undesired
operation.
Table 5. Fault Check-out.
Fault condition
Troubleshooting
PM2.5 data abnormal, deviation is too
large, the value is too high or too low
Check whether there is debris or a lot of dust in the C7355A housing or on the
air inlet and air outlet.
The CO
2
data is abnormal, the value is
too high or too low
The CO
2
sensor has a self-calibration function inside. Usually the self-
calibration will return CO
2
values to normal. Self-calibration conditions: The
CO
2
concentration is around 400 ppm for at least 4 hours in every 24 periods.
The self-calibration environment should last for one week.
TVOC's deviation is too large (high or
low)
TVOC in the environment needs to be stabilized for at least 48 hours after the
sensor is powered on.TVOC data deviation may be a little large within a short
time after power is on. TVOC base line deviation may result in large data
deviation.The equipment can be placed outside the window or outdoors for at
least 24 hours when the outdoor air is good and clear, allowing TVOC to retrace
its baseline.
Temperature and humidity deviation is
too large, the value is too high or low
Check whether the environmental factors surrounding the C7355A have any
influence, such as direct sunlight, close to the heating or air conditioning air
outlets, etc.
Temperature and humidity deviation is
too large; value does not change for a
long time
Sensor can be powered off and back on to see if the reading returns to normal. If
value cannot be recovered, contact the dealer or manufacturer.
Communication interruption RS-485
(Modbus RTU)
Check if the power supply is normal and if the RS-485 terminal is loose. Check
whether the RS-485 communication line is accidentally cut. Check for an
inductive load with electromagnetic interference near the equipment or RS-485
communication line, such as a water pump.
•
At the end of the product life, dispose
of the packaging and product in an
appropriate recycling center.
•
Do not dispose of the device with the
usual domestic refuse.
•
Do not burn the device.