CHUNDE TECHNOLOGY CH-CO Manuel d'installation - Page 2

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To open the wall mounted housing
Figure 1. . Closed housing seen from above.
The housing is opened by pressing a screw
driver into the lock opening slot. .
Figure 2. .By pressing a flat screw-driver
into the opening slot, the two locking hook
would be released.
Figure 2. .Hold the top cover and slowly
separate the top and base housing.
Page 1/4
Sensor Connections
The sensor connecting terminal is shown in
the figure on the right. Please refer to Table 1
for terminal definition.
Electrical connections
The power supply has to be connected to G+
and G0. G0 is considered as system ground.
The same ground reference has to be used for
CH-CO2
the
receiver.
Output Configurations
The sensors/controllers are supplied from the factory with 0...10VDC and 4...20mA linear outputs
for Vo and Io (see Table I).
Fresh-Air Calibration (Cal)
The CH-CO2 has built-in fresh-air calibration (Cal) features. To initiate a Cal function, simply
place the powered-up sensor in the room near an opened window, wait for the sensor to stabilize,
and then short the Cal to M for approximately 5 seconds. The sensor reading is then re-calibrated to
0.04 vol.% CO2; a reading closed to the fresh-air concentration.
PLEASE NOTE!
Avoid doing Fresh-air calibration when;
1.
2.
3.
4.
unit and for the DDC/signal
PLEASE NOTE!
The same ground reference
has to be used for the
CH-
CO2
unit and for the control
system!
Unit is just powered up (sensor should be powered for at least several minutes)
In place where the room is crowded with people
Where there is source of CO2 generation, such as gas-burner,
When the sensor reading is unstable