Carrier CRECOMZR077A00 Installation Instructions Manual

Also see for CRECOMZR077A00: Installation instructions

Contents

20STATUS(cont)ERV 3 OFF ON/OFFENERGY RECOVERY UNIT RELAY OUTPUTOutput of AUX terminal; displays only if AUX = ERVON = relay closedOFF = relay openMECH COOL ON 0 0,1, or 2 Displays stage of mechanical cooling that is active.FAN SPEED n/a LOW or HIGH SUPPLY FAN SPEEDDisplays speed setting of fan on a 2‒speed fan unit.W (HEAT ON) n/a ON/OFF HEAT DEMAND STATUSDisplays status of heat demand on a 2‒speed fan unit.SETPOINTSMAT SET 53°F (12°C)38°F to 65°F(3°C to 18°C);increment by 1°MIXED AIR SET POINTSet point determines where the economizer will modulate the OA damper tomaintain the mixed air temperature.LOW T LOCK 32°F (0°C)–45°F to 80°F(–43°C to 27°C);increment by 1°COMPRESSOR LOW TEMPERATURE LOCKOUTSet point determines outdoor temperature when the mechanical coolingcannot be turned on. Commonly referred to as the compressor lockout.DRYBLB SET 63°F (17°C)48°F to 80°F(9°C to 27°C);increment by 1°OA DRY BULB TEMPERATURE CHANGEOVER SETPOINTSetpoint determines where the economizer will assume outdoor airtemperature is good for free cooling; e.g.: at 63°F (17°C), unit will economizeat 62°F (16.7°C) and below and not economize at 64°F (17.8°C) and above.There is a 2°F (1.1°C) deadband.DRYBULB SET is only displayed if the economizer has a single dry bulbsensorDRYBLB DIFF 0°F 0°F to 6°F;increment by 2°FDry bulb Differential will only show if using dual dry bulb - i.e. when anoutdoor air temperature sensor C7250 is attached to OAT terminals andC7400S sensor is wired to S-Bus and configured for RAT (return air).Free cooling will be assumed whenever OA temp is at or below RAT minusthis dry bulb setting.ENTH CURVE ES3 ES1,ES2,ES3,ES4, or ES5ENTHALPY CHANGEOVER CURVE(Requires enthalpy sensor option)Enthalpy boundary “curves” for economizing using single enthalpyDCV SET 1100ppm 500 to 2000ppm;increment by 100DEMAND CONTROLLED VENTILATION SET POINTDisplays only if CO 2 sensor is connected. Set point for Demand ControlVentilation of space. Above the set point, the OA dampers will modulateopen to bring in additional OA to maintain a space ppm level below the setpoint.MIN POS 4.4 V 2 to 10 vdcVENTILATION MINIMUM POSITION.Only displayed if controller is set for single speed unit under FAN TYPE, andif DCV is NOT used.MIN POS L 6.0V 2 to 10 vdcVENTILATION MINIMUM POSITION AT LOW SPEED.Only displays if unit is set for 2 or 3 speed and CO 2 is not used. IF using 2speed with 1 heat and 1 cool then set for HEATING ventilation. If using 3speed with 1 heat and 2 cool then set for LOW SPEED COOLINGventilation.MIN POS M 5.4V 2 to 10 vdcVENTILATION MINIMUM POSITION AT MEDIUM SPEED.Only displays if unit is set for 3 speed with 1 heat and 2 cool, and CO 2 is notused. Set for HEATING ventilation.MIN POS M 4.4V 2 to 10 vdcVENTILATION MINIMUM POSITION AT HIGH SPEED.Only displays if unit is set for 2 or 3 speed and CO 2 is not used. IF using 2speed with 1 heat and 1 cool then set for COOLING ventilation. If using 3speed with 1 heat and 2 cool then set for HIGH SPEED COOLING ventilationVENTMAX L 6.0 V 2 to 10 vdcDCV MAXIMUM DAMPER POSITION AT LOW SPEEDDisplays only if a CO 2 sensor is connected. Used for Vbz (ventilation maxcfm) set point. Displays 2 to 10 V if <3 sensors (RA,OA, and MA). In AUTOmode dampers controlled by CFMVENTMAX M 5.4 V 2 to 10 vdc DCV MAXIMUM DAMPER POSITION AT MEDIUM SPEED.Only displays if unit is set for 3 speed with 1 heat and 2 cool. Set forHEATING ventilation.VENTMAX H 4.4 V 2 to 10 vdcDCV MAXIMUM DAMPER POSITION AT HIGH SPEED.Only displays if unit is set for 2 speed or 3 speed with 1 heat and 2 cool. IFusing 2 speed with 1 heat and 1 cool then set for COOLING ventilation. Ifusing 3 speed with 1 heat and 2 cool then set for HIGH SPEED COOLINGventilationVENTMIN L 3.7 V 2 to 10 vdcDCV MINIMUM DAMPER POSITION AT LOW SPEED.Only displays if unit is set for 2 speed or 3 speed with 1 heat and 2 cool. IFusing 2 speed with 1 heat and 1 cool then set for HEATING ventilation. Ifusing 3 speed with 1 heat and 2 cool then set for LOW SPEED COOLINGVENTMIN M 3.4 V 2 to 10 vdcDCV MINIMUM DAMPER POSITION AT MEDIUM SPEED.Only displays if unit is set for 3 speed with 1 heat and 2 cool. Set forHEATING ventilation.VENTMIN H 2.8 V 2 to 10 vdcDCV MINIMUM DAMPER POSITION AT HIGH SPEED.Only displays if unit is set for 2 speed or 3 speed with 1 heat and 2 cool. IFusing 2 speed with 1 heat and 1 cool then set for COOLING ventilation. Ifusing 3 speed with 1 heat and 2 cool then set for HIGH SPEED COOLINGventilationTable 11 — Menu Structure1 (cont)MENU PARAMETERPARAMETERDEFAULTVALUEPARAMETERRANGE ANDINCREMENT 2NOTES