Carrier 33CS Installation, Service, And Troubleshooting Instructions

Also see for 33CS: Owner's manual Owner's manual Operating guide Installation, start-up, and operating instructions Installation, start-up, and operating instructions

Carrier 33CS Installation, Service, And Troubleshooting Instructions Manual pdf 27 page image

The system is operating normally without alarm duringthe cooling mode. The trend of the space temperature indi-cates that the system is unable to keep the space within setpoints, and space temperature rises to 76.5 degrees F. Thetrend 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 whenthe system can properly maintain space temperature condi-tions within the space.The alarm is removed using the manual reset. The systemwill 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 switchingthe 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 backto an acceptable range (category 7, options 4 or 5).Discharge-Air Temperature Alarm (Heat/CoolMode Error) — See Table 7 for Discharge-Air Tempera-ture alarm specifications.Table 7 — Discharge Air Temperature AlarmFUNCTION DESCRIPTIONControllers TEMP system ThermostatSensor Required Duct Temperature SensorSensor Wiring Wires to Terminal 13 and 15Input Unit Discharge Air TemperatureOutput SE07 Heat Mode Alarm, SE08 CoolMode AlarmCategory/Option 7.9 (Heat Mode Error Alarm Set Point)7.10 (Cool Mode Error Alarm Set Point)ConfigurationValuesHeating: Min 0, Max 140Cooling: Min 0, Max 140ConfigurationIncrements 1° FAssociatedFunctions NoneOPERATIONHeating 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 (0to 140 F). An automatic 10-minute warm-up/cool-down pe-riod is initiated before any temperature checking begins.CONFIGURATION TO NORMALIZE ALARM — Whenunit discharge temperature rises above the heat mode errorset 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 pointsare 90 and 55 F. During a heat mode, after 10-minute heat-ing period, if discharge temperature does not increase above90 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, ifdischarge temperature does not drop to below 55 F, a coolmode error is generated. After the discharge temperature de-creases to below 55 F, the alarm is normalized.CLEARING THE ALARM FROM THE THERMOSTAT —Heat/Cool Mode Alarms are cleared or ‘‘erased’’ from thesystem in 2 ways:• Cycle power to the thermostat OFF, then ON.• Reset the unit thermostat. Initiate a reset by switching theUnit Reset to the ON configuration (category 7, option 11).Fan Status Alarm — Refer to Table 8 for Fan StatusAlarm specifications.Table 8 — Fan Status AlarmFUNCTION DESCRIPTIONControllers TEMP system ThermostatSensor Required Airflow, Digital InputSensor Wiring Terminals 8 and 9 of 33CSUCE-06 Re-lay PackInput Open contacts at sensor from lack ofairflowOutput Alarm SE06, Cannot Detect Fan OnAlarm SE12, Cannot Detect Fan OffCategory/Option 5.10 (Fan Status)ConfigurationValues Default OFF, Min OFF, Max ONConfigurationIncrements NoneAssociatedFunctionsFan Operation for Heat (Category 4,Option 1)OPERATIONThe detecting or verifying fan is running. The fan relay is onor Heat 1 relay is on.When the TEMP system thermostat indicates commandedstate 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 ventilationmode).When the TEMP system thermostat indicates commandedstate of HEAT 1 (relay) is on, but flow switch indicates noairflow after 120-second delay time (sensor contacts still open),an alarm condition is initiated. This delay time allows forunits 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 alarmDetecting or verifying fan is OFF. Fan Relay is OFF andHeat 1 Relay OFF.When the TEMP system thermostat indicates commandedstate of FAN (relay) is OFF, but flow switch indicates thatairflow still exists after 240-second delay time from fan offcommand (sensor contacts still closed), an alarm conditionis initiated.When alarm condition is initiated:• the TEMP system thermostat will continue to operate thesystem. 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 alarmCONFIGURATION 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 Heatoption (category 4, option 1) ON.27