Honeywell IAQPoint2 User Manual page 42

IAQPoint2™
Gas Sensor Value
Screen Configure / Configure
Setpoints / Set Gas Setpoint
Screen Configure / Configure
Setpoints / Set Gas Hyst
Home Screen
'Occ' softkey
Figure 27. IAQPoint2 relay flow
Configure\Configure Outputs\ Set Relay Source
The functions of the relay are adjusted at this screen� The monitor normally
responds to gas concentrations (i�e�, the air quality level)� The Set Relay Source
feature allows a relay to respond to the occupied timer or, for digital versions, to
the network (fieldbus, for example, in BACnet systems)� The default selection is air
quality level�
By default, the relay energizes when the gas concentration is lower than the
setpoint� However, this screen also facilitates configuring the relay to respond
to fieldbus inputs (and thus become a general purpose output)� This screen can
configure the relay to energize whenever the occupied timer is running as well� In
this mode the button plus relay function as a classic "override" input –the relay can
be hardwired to a universal input on a building automation controller� Figure 27
illustrates the operation of the relay�
Configure\Outputs submenu\Automatic Baseline
The internal CO sensor can apply continuous, slow fine-tuning so that the
2
minimum observed concentration is reported as 400 ppm, which is the approximate
atmospheric concentration of carbon dioxide� This automatic baseline feature
is enabled by default and, in most situations, eliminates the need for periodic
calibration� However, it requires that the environment be unoccupied regularly so
that the internal CO concentration falls to atmospheric levels� (This would make
2
the automatic baseline feature inappropriate for buildings such as hospitals or
greenhouses which have CO
After the automatic baseline setting is changed, power to the monitor must be
removed briefly for correct operation (a soft reboot is insufficient)� This can be
accomplished by loosening the screws and briefly disconnecting the monitor from
the backplate�
The Automatic Baseline screen is not accessible if the monitor has a VOC sensor�
36
-
+
not
Gas Sensor Fault
Screen Configure / Configure
Output / Set Occupied Timeout
Countdown
reset
Timer
generation around the clock�)
2
Screen Configure / Configure Outputs
/ Set Relay
and
Gas Conc.
Fieldbus
Occ Tmr
Q
"Occupied"
icon
Relay
Coil