Specifications

CONFIGURATION EXAMPLE — The Filter Status sensor
will close contacts (alert) when differential pressure in-
creases from zero (clean filter, no restriction, or pressure drop
across filter) to the sensor set point (dirty filter with restric-
tion across filter). The Humidity Sensor/Fan Filter Switch
option (category 5, option 11) is set to the value of 2 to specify
the filter status switch.
During operation of the unit over a period of time, an SE09
error is declared. This indicates that the differential pressure
across the filters has increased beyond the set point value of
the sensor. The Alternate Information "Dirty Filter Status"
(category 7, option 3, information item 10) will read ON,
also indicating a dirty filter.
After the dirty filters are changed, the Dirty Filter Status
must be manually reset. The system then returns to normal
operation and will not alert until the differential pressure set
point of the Filter Status sensor is again reached.
CLEARING THE ALERT FROM THE THERMOSTAT —
Dirty Filter Alerts are cleared or erased from the system in
three ways using a manual reset:
1. Cycle power to the thermostat off, then on.
2. Initiate a reset by switching the Unit Reset option to the
ON configuration (category 7, option 11).
3. Switch the configuration value for Fan Status Switch op-
tion to OFF then ON (category 5, option 10).
Indoor-Air Quality Status Alarm — Refer to
Table 10 for IAQ (Indoor Air Quality) Alarm specifications.
Table 10 — IAQ (Indoor Air Quality) 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 SE10
Category/Option
14.1 (System IAQ)
14.2 (Local IAQ Sensor)
Configuration
Values
14.1 — ON
14.2 — 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 monitor
thermostat will wait until the IAQ Alarm Delay option
(category 14, option 8) has expired, then it will issue an SE10.
The system (if configured) will bring in fresh outdoor air to
meet IAQ requirements.
When the CO
2
level exceeds the preset level (factory con-
figuration is 1000 ppm and cannot be changed without op-
tional software), the sensor signals the monitor thermostat.
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 opera-
tion, the monitor thermostat energizes the relay. This is in-
tended for use with an economizer, but can be wired to an
exhaust fan or HRV. If used with an economizer, the econo-
mizer moves to the minimum position and the indoor fan
circulates the air throughout the occupied space.
The monitor has 3 lockout features which will prevent IAQ
mode if the outdoor humidity is too high or the outdoor tem-
perature is too high or too low. When the monitor thermostat
energizes the auxiliary relay, it tells the zone controllers and
bypass controller.
When the monitor thermostat receives an IAQ alarm from
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 damper opens and the zone damper moves to
the full or maximum open position. This forces fresh outside
air to enter 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 and
below the original set point to allow the outside air to cir-
culate before the heating or cooling mode is initiated. The
monitor thermostat will display status when the system is in
this mode.
CLEARING THE ALARM — To clear a system error, use
the Unit Reset function. The Unit Reset function is in
category 7, option 11. The default is OFF. Use the left set
point buttons to set the option to ON. The monitor thermo-
stat will reset all errors.
Communication Failure Alarm — Refer to Table 11
for Communication Failure Alarm specifications.
Table 11 — Communication Failure Alarm
FUNCTION DESCRIPTION
Controllers
Monitor Thermostat, Zone Controller,
Bypass Controller
Sensor Required None
Sensor Wiring None
Input Network Devices
Output SE05 Communication Failure
Category/Option None
Configuration
Values
None
Configuration
Increments
None
Associated
Functions
None
OPERATION — The devices in the system communicate
and share information. The monitor thermostat has the role
of verifying that it can communicate with each device as-
sociated with its system. During a scan, the monitor ther-
mostat starts at its own address and proceeds to scan in de-
scending order, checking addresses. It stops the scan when
the maximum number of devices in its system has been scanned,
or when a device other than a zone controller or a bypass
controller is detected. If it does not detect any devices or is
unable to scan the network, then the monitor thermostat will
issue an SE05 error.
CONFIGURATION TOACTIVATE THE ALARM — When
the monitor thermostat cannot communicate with all asso-
ciated zone controllers or system devices, a System Error
SE05 will be initiated. The error indicates that the monitor
thermostat is unable to establish communication contact with
the device in question.
No configuration is needed to activate the alarm. The alarm
will automatically be initiated when a communication fail-
ure occurs.
CLEARING THE ALARM — The communication error will
automatically clear when the monitor thermostat establishes
communication with the associated zone controller or sys-
tem device.
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