Carrier 50ZH Series Product Data
Also see for 50ZH030: Installation, Start-Up and Service InstructionsProduct dataInstallation instructionsInstallation, Start-Up and Service Instructions
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2150ZHTypical InstallationC00008TOP COVERINDOORTHERMOSTATDISCONNECTPER NEC*(UNIT ANDELECTRICHEATER)FROMPOWERSOURCERETURNAIRPOWER ANDLOW-VOLTAGEENTRYCOMPOSITERUST-PROOFBASEPANCONDENSATEDRAINCONNECTION*Separate disconnect per NEC(National Electrical Code) requiredfor electric heater when single-point conection is not used.Power WiringControl WiringCondenser AirflowEvaporator AirflowSequence of operationWhen power is supplied to unit, the transformer (TRAN) isenergized.Cooling — With the thermostat subbase in the coolingposition, and when the space temperature comes within 2°Fof the cooling set point, the thermostat makes circuit R-O.This energizes the reversing valve solenoid (RVS) and placesthe unit in standby condition for cooling.As the space temperature continues to rise, the second stageof the thermostat makes, closoing circuit R-Y. Whencompressor time delay (5 ± 2 minutes) is completed, a circuitis made to contactor (C), starting the compressor (COMP)and outdoor-fan motor (OFM). Circuit R-G is made at thesame time, energizing the indoor-fan relay (IFR) and startingthe indoor-fan motor (IFM) after a 1-second delay.When the thermostat is satisfied, contacts open, deenergizingC. The COMP and OFM stop, and the IFM stops after a 30second time delay.Heating — On a call for heat, thermostat makes circuitsR-Y and R-G.When compressor time delay (5 ± 2 minutes) is completed,a circuit is made to C, starting COMP and OFM. Circuit R-G also is completed, energizing IFR and starting IFM after a1-second delay.Should room temperature continue to fall, circuit R-W ismade through second-stage thermostat bulb. If optionalelectric heat package is used, a relay is energized, bringingon first bank of supplemental electric heat. When thermostatis satisfied, contacts open, deenergizing contactor and relay;motors and heaters deenergize. The IFM may be controlledby a time-delay relay that keeps the fan on for 30 seconds.Defrost — Defrost board (DB) is a time and temperaturecontrol, which includes a field-selectable time periodbetween checks for defrost (30, 50, and 90 minutes).Electronic timer and defrost cycle start only when contactoris energized and defrost thermostat (DFT) is closed.Defrost mode is identical to cooling mode, except outdoor-fan motor stops and a bank of optional electric heat turns onto warm air supplying the conditioned space.ControlsCondensate trap — A 2-in. condensate trap must be fieldsupplied.Maximum cooling airflow — To minimize the possibilityof condensate blow-off from the evaporator, airflow throughthe units should not exceed 450 cfm/ton.Minimum cooling airflow — The minimum cooling airflowis 350 cfm/ton.Minimum cooling operating outdoor air temperature —All standard units have a minimum ambient operatingtemperature of 40°F. With accessory low ambient temperaturekit, units can operate at temperatures down to 0°F.Maximum operating outdoor air temperature — Maximumoutdoor operating air temperature for cooling is 125°F.Application data1” MIN.2” MIN.TRAPOUTLET |
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