Product data

Application data (cont)
Indoor-air quality status alarm — Refer to the IAQ
(indoor-air quality) Status Alarm table for specifications.
IAQ STATUS ALARM
FUNCTION DESCRIPTION
Controllers
Monitor Thermostat, Zone Controller,
Bypass Controller
Sensor Required IAQ (CO
2
) Sensor
Sensor Wiring
Pins 6 and 7 of Relay Board or
Wire to Damper Board
Input
Closed Contact when Level
Exceeded.
Output SE-10
Configuration Option
System IAQ
Local IAQ Sensor
Configuration Values
ON
ON
Configuration Increments Not Applicable
Associated Functions None
Operation
When the CO
2
level exceeds the preset level, the sensor
signals the monitor thermostat. The monitorthermostat will
wait until the IAQ Alarm Delay option has expired, then it
will issue an SE-10. The system (if configured) will bring in
fresh outdoor air to meet IAQ requirements.
When the CO
2
level exceeds the preset level (factory
configuration is 1000 ppm and cannot be changed without
optional software), the sensor signals the monitor thermo-
stat. The monitor thermostat energizes the indoor-fan
motor (if not already running) for 5 to 30 minutes (field-
configured). If the Auxiliary Relay has been configured for
IAQ operation, the monitor thermostat energizes the relay.
This is intended for use with an economizer, but can be
wired toan exhaust fan or HRV. If used with an economizer,
the economizer moves to the minimum position and the in-
door fan circulates the air throughout the occupied space.
The monitor thermostat has 3 lockout features which will
prevent IAQ mode if the outdoor humidity is too high or
the outdoor temperature is too high or too low. When the
monitor thermostat energizes the auxiliary relay, it tells the
zone controllers and bypass controller.
Whenthe monitorthermostat receivesan IAQalarmfrom
a bypass controller (or itself in monitor-only mode), it sends
all the zone controllers the system IAQ alarm.
At the end of the 5 to 30 minutes, if the CO
2
level still
exceeds the set point, the indoor fan will stay energized.
The economizer damperopens andthe zonedamper moves
to the full open position. This forces fresh outside air to en-
ter the zone with deficient IAQ. When the IAQ level drops
below the IAQ set point, the economizer and zone damp-
ers return to their standard operating mode.
When the system is bringing in additional outside air, the
thermostat is reset 0° to 10° F (field-configured) above the
heating set point and below the cooling set point to allow
the outside air to circulate before the heating or cooling
mode is initiated. The monitor thermostat will display sta-
tus when the system is in this mode.
Communication failure alarm — Refer to the Commu-
nication Failure Alarm table for specifications.
COMMUNICATION FAILURE ALARM
FUNCTION DESCRIPTION
Controllers
Monitor Thermostat,
Zone Controller,
Bypass Controller
Sensor Required None
Sensor Wiring None
Input Network Devices
Output
SE-05 Communication
Failure
Configuration Option None
Configuration Values None
Configuration Increments None
Associated Functions None
Operation
The devices in the system communicate and share infor-
mation. The monitor thermostat has the role of verifying
that it can communicate with each device associated with
its system. During a scan, the monitor thermostat starts at
the address below its own address and proceeds to scan in
descendingorder, checkingaddresses. It stopsthe scanwhen
it reaches address 1. If it does not detect any devices or is
unable to scan the network, then the monitor thermostat
will issue an SE-05 error.
When the monitor thermostat cannot communicate with
all associated zone controllers or system devices, a System
Error SE-05 will be initiated. The error indicates that the
monitor thermostat is unable to establish communication
contact with the device in question.
The communication error will automatically clear when
the monitor thermostat establishes communication with the
associated zone controller or system device.
Stuck gas valve alarm — Refer to the Stuck Gas Valve
Alarm table for specifications.
STUCK GAS VALVE ALARM
FUNCTION DESCRIPTION
Controllers Monitor Thermostat
Sensor Required N/A
Sensor Wiring N/A
Input
Duct Temperature Sensor
(Damper)
Output
SE-13, Stuck Gas Valve
Alarm
Configuration Option None
Configuration Values None
Configuration Increments None
Associated Functions None
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