Discharge-Air Temperature Alarm (Heat/Cool Mode Error); Fan Status Alarm - Carrier 33CS Installation, Service, And Troubleshooting Instructions

The system is operating normally without alarm during
the cooling mode. The trend of the space temperature indi-
cates that the system is unable to keep the space within set
points, and space temperature rises to 76.5 degrees F. The
trend of the space temperature is not improving, and tem-
perature conditions are getting worse for at least seven min-
utes. At that time, a space temperature (Comfort Trend) alarm
(SE01) is initiated. The alarm will automatically clear when
the system can properly maintain space temperature condi-
tions within the space.
The alarm is removed using the manual reset. The system
will not return to normal without being reset.
CLEARING THE ALARM FROM THE THERMO-
STAT — Space temperature alarms can be cleared or ''erased''
from the system in 3 ways:
• Cycle power to the thermostat OFF, then ON.
• Reset the Unit Thermostat. Initiate a reset by switching
the Unit Reset option to the ON configuration (category 7,
option 11).
• Switch the configuration value for Comfort Trend De-
mand or the Comfort Trend Time Limit to zero, then back
to an acceptable range (category 7, options 4 or 5).
Discharge-Air Temperature Alarm (Heat/Cool
Mode Error) —
See Table 7 for Discharge-Air Tempera-
ture alarm specifications.
Table 7 — Discharge Air Temperature Alarm
FUNCTION
Controllers TEMP system Thermostat
Sensor Required Duct Temperature Sensor
Sensor Wiring Wires to Terminal 13 and 15
Input Unit Discharge Air Temperature
SE07 Heat Mode Alarm, SE08 Cool
Output
Mode Alarm
7.9 (Heat Mode Error Alarm Set Point)
Category/Option
7.10 (Cool Mode Error Alarm Set Point)
Configuration Heating: Min 0, Max 140
Values Cooling: Min 0, Max 140
Configuration
1° F
Increments
Associated
None
Functions
OPERATION
Heating Mode– Alarm is issued when unit discharge tem-
perature is not above the heating mode error set point.
Cooling Mode– Alarm is issued when unit discharge tem-
perature is not below the cooling mode error set point.
CONFIGURATION TO ACTIVATE ALARM — To acti-
vate alarm, configure error set points for Heat/Cool mode (0
to 140 F). An automatic 10-minute warm-up/cool-down pe-
riod is initiated before any temperature checking begins.
CONFIGURATION TO NORMALIZE ALARM — When
unit discharge temperature rises above the heat mode error
set point, the heat mode alarm is normalized. When unit dis-
charge temperature drops below the cool mode error set point,
the cool mode alarm is normalized.
For example, the Heating/Cooling Mode Error set points
are 90 and 55 F. During a heat mode, after 10-minute heat-
ing period, if discharge temperature does not increase above
90 F, a heat mode error is generated. After discharge tem-
perature increases to above 90 F, the alarm is normalized.
During cooling mode, after a 10-minute cooling period, if
discharge temperature does not drop to below 55 F, a cool
mode error is generated. After the discharge temperature de-
creases to below 55 F, the alarm is normalized.
DESCRIPTION
CLEARING THE ALARM FROM THE THERMOSTAT —
Heat/Cool Mode Alarms are cleared or ''erased'' from the
system in 2 ways:
• Cycle power to the thermostat OFF, then ON.
• Reset the unit thermostat. Initiate a reset by switching the
Unit Reset to the ON configuration (category 7, option 11).
Fan Status Alarm —
Alarm specifications.
Table 8 — Fan Status Alarm
FUNCTION
Controllers
Sensor Required
Sensor Wiring
Input
Output
Category/Option
Configuration
Values
Configuration
Increments
Associated
Functions
OPERATION
The detecting or verifying fan is running. The fan relay is on
or Heat 1 relay is on.
When the TEMP system thermostat indicates commanded
state of FAN (relay) is on, but flow switch indicates no air-
flow after 30-second time delay (sensor contacts still open),
an alarm condition is initiated (heat or cool or ventilation
mode).
When the TEMP system thermostat indicates commanded
state of HEAT 1 (relay) is on, but flow switch indicates no
airflow after 120-second delay time (sensor contacts still open),
an alarm condition is initiated. This delay time allows for
units having internal control of heat, versus thermostat con-
trol of heat.
When an alarm condition is initiated:
• system mode (either heat or cool) is dropped
• alarm SE06, Cannot Detect Fan ON, is issued
• A manual reset is required to reset the alarm
Detecting or verifying fan is OFF. Fan Relay is OFF and
Heat 1 Relay OFF.
When the TEMP system thermostat indicates commanded
state of FAN (relay) is OFF, but flow switch indicates that
airflow still exists after 240-second delay time from fan off
command (sensor contacts still closed), an alarm condition
is initiated.
When alarm condition is initiated:
• the TEMP system thermostat will continue to operate the
system. This allows future calls for heat or cool to be ini-
tiated.
• alarm SE12, Cannot Detect Fan OFF, is issued
• a manual reset is required to reset the alarm
CONFIGURATION TO ACTIVATE ALARM — To acti-
vate the alarm, configure the Fan Status Switch option (cat-
egory 5, option 10) to ON. Leave the Fan Operation For Heat
option (category 4, option 1) ON.
27
Refer to Table 8 for Fan Status
DESCRIPTION
TEMP system Thermostat
Airflow, Digital Input
Terminals 8 and 9 of 33CSUCE-06 Re-
lay Pack
Open contacts at sensor from lack of
airflow
Alarm SE06, Cannot Detect Fan On
Alarm SE12, Cannot Detect Fan Off
5.10 (Fan Status)
Default OFF, Min OFF, Max ON
None
Fan Operation for Heat (Category 4,
Option 1)