Carrier Performance 50VR-A Installation Instructions Manual

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13ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury or death.Disconnect electrical power to the unit and install lockouttag before changing blower speed.! WARNINGThe standard evaporator fan motor is factory set to provide 5different fan speeds to choose from for the various operationmodes (see Table 4). All models are factory--shipped for nominalhigh stage and low stage cooling airflow operation at minimumexternal static pressure. See Table 2.Table 4 – Color Coding for Indoor Fan Motor LeadsBlack = High SpeedOrange = Med--High SpeedRed = Med SpeedPink = Med--Low SpeedBlue = Low SpeedSelection of Proper Fan Speeds for Operation Modes:Low Stage Cooling/Heat Pump (All Models without AdvancedDehumidification): Using Tables 8 , 9, and 10, find the externalstatic pressure drops for wet coil, economizer, and filter, and addthem to dry coil measured on the system. Using this total staticpressure, look up Table 5 to find the airflows available at the totalstatic pressure. For 208/230 VAC models, connect the chosen fanspeed wire to “LO COOL” connection on the IFB Board (see Fig.11). For 460 VAC models, connect the chosen fan speed wire to“LOW” connection on the IFB (see Fig. 11).High Stage Cooling/Heat Pump (All Models without AdvancedDehumidification):Using Table 8 , 9, and 10, find the externalstatic pressure drops for wet coil, economizer, and filter, and addthem to dry coil measured on the system. Using this total staticpressure, look up Table 5 to find the airflows available at the totalstatic pressure. The speed chosen must provide airflow of between350 to 450 CFM per ton of cooling. For 208/230 VAC models,connect the chosen fan speed wire to “HI COOL” connection onthe IFB Board (See Fig. 11). For 460 VAC models, connect thechosen fan speed wire to “HIGH” connection on the IFB (see Fig.11).High Stage Enhanced Dehumidification Cooling (208/230 VACModels without Advanced Dehumidification): Using the totalstatic pressure for selecting the high stage cooling speed, look upTable 5 to find lower speed/airflows available at that total staticpressure. All airflows highlighted in Table 5 are acceptable for theDehum speed. The speed chosen must provide airflow of between320 to 400 CFM per ton of cooling. To activate the high stageenhanced dehumidification cooling mode, the shunt jumper mustbe moved from the “No DH” to the “DH” selection. (See Fig. 11,close up.) For 208/230 VAC models, connect the chosen fan speedwire to “DHUM” connection on the IFB Board (see Fig. 11).Continuous Fan (All Models without AdvancedDehumidification): Continuous fan speed is the same speed asLow Stage Cooling.To activate the high stage enhanced dehumidification coolingmode, the shunt jumper in Fig. 11 must be moved from the No DHto DH selection (See Fig. 11, close up).Using the Same Fan Speed for More than One Mode: Some fanspeeds are ideal for more than one mode of operation. It ispermissible to use a field--supplied jumper wire to connect onespeed tap wire to two or more speed connections on the InterfaceFan Board (IFB). Jumper wires must use 18 AWG wire with atleast 2/64” insulation.Cooling/Heat Pump/Continuous Fan with AdvancedDehumidification: For Advanced Dehumidification models, touse the dehumidification feature, cut the J1 jumper found on theInterface Fan Board (IFB). (See Fig. 11 and 16.) For properoperation, the dehumidistat must open on humidity rise above thehumidity set point. The unit will naturally adapt airflow to theexternal static pressure drop measured on the system. There is noneed to adjust the factory installed taps.SEQUENCE OF OPERATIONa. Continuous Fan(1.) Thermostat closes circuit R to G energizing theblower motor for continuous fan. The indoor fan isenergized on low speed.b. Cooling Mode(1.) Low Stage: Thermostat closes R to G, R to Y1,and R to O. The compressor and indoor fan areenergized on low speed. The outdoor fan is alsoenergized(2.) High Stage: Thermostat closes R to G, R to Y1, Rto Y2, and R to O. The compressor and indoor fanare energized on high speed. The outdoor fan isalso energized.c. Electric Heating Mode(1.) Thermostat closes circuit R to W2 or W3, and R toG. There are no on or off delays.d. Heat Pump Heating(1.) Low Stage: Thermostat closes R to G, R to Y1.The compressor and indoor fan are energized onlow speed. The outdoor fan is also energized(2.) High Stage: Thermostat closes R to G, R to Y1, Rto Y2. The compressor and indoor fan are ener-gized on high speed. The outdoor fan is also ener-gized.e. Heat Pump Heating with Auxiliary Heat(1.) Thermostat closes circuits R to G, R to Y and R toW/W1 or W2. The compressor, indoor and outdoorfans are energized, as well as the electric heatrelays.f. Defrost ModeThe defrost mode is automatically energized by thedefrost board during heating mode. The defrost boardenergizes “O” (reversing valve) and “W2” (electricheat). It also de--energizes the outdoor fan. When defrostis complete, unit will return to heating mode. If roomthermostat is satisfied during defrost, unit will shutdown and restart in defrost on next call for heat.Step 4 — Defrost ControlQuiet ShiftQuiet Shift is a field--selectable defrost mode, which will eliminateoccasional noise that could be heard at the start of defrost cycle andrestarting of heating cycle. It is selected by placing DIP switch 3(on defrost board) in ON position.When Quiet Shift switch is placed in ON position, and a defrost isinitiated, the following sequence of operation will occur. Reversingvalve will energize, outdoor fan will turn off, compressor will turnoff for 30 sec and then turn back on to complete defrost. At thestart of heating after conclusion of defrost reversing valve willde--energize, compressor will turn off for another 30 sec, and theoutdoor fan will stay off for 40 sec, before starting in the Heatingmode.DefrostThe defrost control is a time/temperature control which includes afield--selectable time period (DIP switch 1 and 2 on the board)between defrost cycles of 30, 60, 90, or 120 minutes (factory set at60 minutes). To initiate a forced defrost, two options are availabledepending on the status of the defrost thermostat.50VR