Specifications

COMFORT TREND (SPACE TEMPERATURE) ERROR
(SE01) — A Comfort Trend error is a system error that pro-
vides information on the ability of the system to maintain
temperature conditions in its reference zone.
When the reference zone demand exceeds the Comfort Trend
Demand Set Point, the monitor thermostat begins tracking
the Temperature Trend of the zone.
The monitor thermostat declares a Comfort Trend Error
for the zone when the Temperature Trend is continuously
zero (zone temperature conditions are not improving) or posi-
tive (zone temperature conditions are becoming worse) for
the entire Comfort Trend Time Limit.
To clear a Comfort Trend Error, use the Unit Reset func-
tion. 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 thermostat will reset all errors. When
the monitor thermostat issues an SE01, it will not issue a
return to normal if conditions improve.
By indicating when zone heating or cooling set points can-
not be satisfied, a Comfort Trend Error helps identify zone
problems.
When the system is commissioned, this information can
be used by the installing contractor to recognize zone air-
flow or supply-air temperature problems in the system.
During system operation, Comfort Trend Errors can be con-
tinuously monitored for the servicing contractor to deter-
mine when system or equipment problems are affecting zone
comfort.
To troubleshoot a Comfort Trend Error:
1. Check the quantity of airflow into the monitor thermostat
zone.
a. Check the configuration of the monitor thermostat
Damper Maximum Open Position setting (category 3,
option 1) and the position of any balancing dampers
used by the zone. Dampers may need to be adjusted
further open to allow additional airflow into the zone.
The allowable range for the Damper Maximum Open
Position setting is 15 to 8, with 15 being full open and
8 being approximately 50% open.
b. Check the ductwork running to the monitor thermo-
stat zone. Loose connections or poorly insulated duct
can result in reduced air volume or temperatures caus-
ing the monitor thermostat zone not to satisfy within
the Comfort Trend Time Limit.
c. Check the bypass controller configuration. If the by-
pass controller is not configured correctly, it can keep
the system static pressure too low to meet the design
load airflow requirements.
d. After the previous steps have been completed, the per-
formance of the supply air fan should be checked. Dur-
ing full load situations, the fan must produce an ad-
equate quantity of supply air at the necessary static
pressure to meet the zone design requirements.
2. Check the temperature of airflow into the zone. If the tem-
perature is above the zone design conditions during sys-
tem cooling mode, or below design conditions during system
heating mode, the operation of the equipment should be
checked. Reset the monitor thermostat.
COMFORT TREND DEMAND SET POINT — The Com-
fort Trend Demand Set point establishes the minimum zone
demand level that must exist in the reference zone before it
can declare a Comfort Trend Error.
The Comfort Trend Demand set point is configured in
category 7, option 4. Use the left set point buttons to raise
or lower the set point. The range of values is 0 to 25.5° F in
1/10° F increments. The default is 0° F.
COMFORT TREND TIME LIMIT — The Comfort Trend
Time Limit establishes the continuous amount of time that
must elapse before the monitor thermostat can declare a Com-
fort Trend Error.
The Comfort Trend Time Limit set point is configured from
category 7, option 5. The range of values is 0 to 255 minutes
in 1-minute increments. The default is 0 minutes.
METER FULL ERROR (SE02,03,04) — System Errors SE02,
SE03, and SE04 indicate when a zone meter is full.
NOTE: During a meter full error, the full usage meter stops
recording and retains its maximum value until cleared.
To clear an SE02, SE03, or SE04 error, the values for the
meters must be forced to zero through communications.
COMMUNICATION ERROR (SE05) — The monitor ther-
mostat will declare a communication error if it is unable to
access the bus or complete a scan for a period of 2 minutes.
A communication error may be caused by:
1. A bad communication driver in the monitor thermostat.
2. A shorted bus.
3. Duplicate addressing within the scanning range of the
monitor.
4. Abusy bus which is inhibiting the monitor thermostat from
getting onto the bus and scanning its devices.
CANNOT DETECT INDOOR FAN ON (SE06) — The moni-
tor thermostat will declare an SE06 if the FAN relay is en-
ergized, but the fan status switch is sending an OFF status.
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 thermostat will reset all errors.
To troubleshoot the error, check the operation and wiring
of the system fan.
SUPPLY-AIR TEMPERATURE (HEAT OR COOL MODE)
ERROR (SE07,08) — A Supply-Air Temperature error is a
system error that indicates inadequate supply-air tempera-
ture during a system heating or cooling mode. An SE07 (Heat
Mode Error) will occur when the supply-air temperature is
not adequate for heating. An SE08 (Cool Mode Error) will
occur when the supply-air temperature is not adequate for
cooling.
A heat or cool mode error occurs when the temperature at
every supply-air temperature sensor associated with the moni-
tor thermostat system exceeds an operating mode set point
continuously for 10 minutes. During a system cooling mode,
an SE08 error occurs when the supply-air temperature is higher
than the Cooling Mode Error Set Point. During a system heat-
ing mode, an SE07 error occurs when the supply air tem-
perature is lower than the Heating Mode Error Set Point.
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 thermostat will reset all errors.
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