Heating Mode Error Set Point (F); Cooling Mode Error Set Point (F) - Carrier 33CS Installation, Service, And Troubleshooting Instructions

To troubleshoot a Comfort Trend Error:
1. Check the quantity of airflow into the TEMP system ther-
mostat zone.
a. Check the ductwork running to the TEMP system
thermostat zone. Loose connections or poorly
insulated duct can result in reduced air volume or
temperatures causing the TEMP system thermo-
stat zone not to satisfy within the Comfort Trend
Time Limit.
b. After the previous steps have been completed, the
performance of the supply air fan should be
checked. During full load situations, the fan must
produce an adequate quantity of supply air at the
necessary static pressure to meet the zone design
requirements. Reset the TEMP system thermostat
transparent error register.
2. Check the temperature of airflow into the zone. If the
temperature is above the zone design conditions during
system cooling mode, or below design conditions during
system heating mode, the operation of the equipment
should be checked. Reset the TEMP system thermostat
transparent error register.
Comfort Trend Demand Set Point — The Comfort 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 cate-
gory 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
ments. The default is 0° F.
Comfort Trend Time Limit — The Comfort Trend Time Lim-
it establishes the continuous amount of time that must elapse
before the TEMP system thermostat can declare a Comfort
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, reset the full meter
through communications and 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
TEMP system thermostat will reset all errors.
CANNOT DETECT INDOOR FAN ON (SE06) — The
TEMP system thermostat will declare an SE06 if the FAN
relay is energized, 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
TEMP system 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, SE08) — A Supply-Air Temperature error is a
system error that indicates inadequate supply-air temperature
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 TEMP
system 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 tempera-
ture 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
TEMP system thermostat will reset all errors.
To disable the error, set the Cooling Mode Error Set Point to
0 F and the Heating Mode Error Set Point to 140 F.
To clear the error, check the operation of the system heating
and cooling equipment.
1. Check the economizer operation. The economizer could
be allowing more outside air into the system than the
equipment was designed to use.
2. The HVAC equipment has internal controls that can auto-
matically shutdown the heating or cooling capacity based
on operating limits. When this occurs, the TEMP system
thermostat relay pack remains energized, but the equip-
ment cannot provide conditioned air to the zones.
3. Check the capacity of the HVAC equipment to handle the
building load. If the equipment is undersized, it may not
be able to provide supply air that is either warm enough
or cold enough to meet the system need during design
conditions.
4. Reset the TEMP system thermostat error register.
Heating Mode Error Set Point — The Heating Mode Error
1
/ ° F incre-
10
Set Point establishes the supply-air temperature during a sys-
tem heating mode. To configure the option, set category 7, op-
tion 9. Use the left set point button to raise or lower the temper-
ature until the desired set point value is shown. The range of
acceptable values is 0 to 140 F in 1° F increments. The default
is 0° F.
Cooling Mode Error Set Point — The Cooling Mode Error
Set Point establishes the supply-air temperature during a sys-
tem cooling mode. To configure the option, set category 7, op-
tion 10. Use the left set point button to raise or lower the tem-
perature until the desired set point value is shown. The range of
acceptable values is 0 to 140 F in 1° F increments. The default
is 140 F.
DIRTY FILTER ERROR (SE09) — The Dirty Filter Error will
occur when the filter status switch sends an ON (dirty) signal
to the TEMP system thermostat. The filter status switch com-
pares the pressure on both sides of the filter. If the pressure dif-
ference rises above the factory-defined set point, an SE09 error
will occur.
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
TEMP system thermostat will reset all errors.
To troubleshoot the error, clean the filter and check the oper-
ation of the system fan. Check the positioning of the filter sen-
sor tubes. They should be unobstructed and in the correct loca-
tion. Refer to the fan/filter status installation instructions for
more information.
INDOOR-AIR QUALITY ERROR (SE10) — When the CO
level exceeds the preset level, the sensor signals the TEMP
system thermostat. The TEMP system thermostat will wait
until the IAQ Alarm Delay option (category 14, option 7) has
expired, then it will issue an SE10. The system (if configured)
will bring in fresh outdoor air to meet IAQ requirements. If the
IAQ Alarm Delay, is not set to give the system enough time to
correct IAQ problems, the SE10 will be issued every time the
IAQ mode is entered.
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