Reznor RCB User Manual

Form CP-MAPSIII-D21, Doc No 303070, Page 14
4.1 Alarms (cont’d)
4.0 Safeties
and Alarms
(cont’d)
If the outdoor air humidity sensor reading (U1) is “invalid”, the unit will turn off the
OAdewpointenableddehumidicationmode.Theunitalarmdisplayshallshow
“Outdoor Air Humidity Sensor Failure”. The unit will automatically return to
normal operation when the humidity sensor value returns.
Alarm ID: 11 Outside Air Temperature Sensor Failure
If the outdoor air temperature sensor reading (U2) is “invalid”, the unit will turn off
heating and cooling functions. The unit alarm display shall show “Outside Air
Temperature Sensor Failure Blower Only”. The unit will automatically return to
normal operation when the temperature sensor value returns.
Alarm ID: 12 Discharge Air Temperature Sensor Failure (Critical Shutdown Alarm)
If the discharge air temperature sensor reading (U4) is “invalid”, the unit will
shut down. All equipment will be turned OFF. The unit alarm display shall show
“Discharge Air Temperature Sensor Failure Unit OFF”. The unit will not
restart until the condition has cleared and the alarm is acknowledged via the unit
controller or remote display.
Alarm ID: 13 Cooling Coil Temp Sensor Failure
If the cooling coil temperature sensor reading (U5) is “invalid”, the unit will turn off
alldehumidicationfunctions.Theunitalarmdisplayshallshow“Cooling Coil
Temp Sensor Failure”. The unit will automatically return to normal operation
when the temperature sensor value returns.
Alarm ID: 14 Mixed Air Temp Sensor Failure
If the mixed air temperature sensor reading (U6) is “invalid”, the unit alarm display
shall show “Mixed Air Temp Sensor Failure”.
Alarm ID: 15 Building Pressure Sensor Failure
If the pressure sensor reading (U7) is “invalid”, the unit alarm display shall show
“Building Pressure Sensor Failure”.
Alarm ID: 16 Duct Pressure Sensor Failure
If the pressure sensor reading (U7) is “invalid”, the unit alarm display shall show
“Duct Pressure Sensor Failure”.
Alarm ID: 17 CO2 Sensor Failure
If the CO2 sensor reading (U9) is “invalid”, the unit alarm display shall show
“CO2 Sensor Failure”.
Alarm ID: 19 Gas Heater 1 Status Alarm
 WhentherststageofheatingassociatedwithGasHeater1isenabledandproof
ofameisnotprovenviatheheaterignitioncontrolboardwithinveminutes,the
unit alarm display shall show “Possible Failure Gas Heater 1 Check Ignition
Control Board”.
Alarm ID: 20 Gas Heater 2 Status Alarm
WhentherststageofheatingassociatedwithGasHeater2isenabledandproof
ofameisnotprovenviatheheaterignitioncontrolboardwithinveminutes,the
unit alarm display shall show “Possible Failure Gas Heater 2 Check Ignition
Control Board”.
Alarm ID: 23 Return Air Probe Ofine
When an optional return air probe is enabled and the serial communication fails,
the unit alarm display shall show “Serial Sensor Add 128 Return Air Probe
Ofine”.
Alarm ID: 24 Return Air Temperature Probe Broken
When an optional return air probe is enabled and the temperature sensor fails, the
unit alarm display shall show “Serial Sensor Add 128 Return Air Temperature
Probe Broken”.
Alarm ID: 25 Return Air Humidity Probe Broken
When an optional return air probe is enabled and the humidity sensor fails, the unit
alarm display shall show “Serial Sensor Add 128 Return Air Humidity Probe
Broken”.
Alarm ID: 26 Exhaust Air Probe Ofine

Reznor RCB Specifications

General

Brand	Reznor
Model	RCB
Category	Air Handlers
Language	English