Carrier 50VL-A Performance Installation Instructions Manual

Also see for Performance 50VL-A: Owner's information manual Installation instructions Installation instructions Installation instructions

Contents

14HIGH LOW COMQC5 QC4 QC3KZ KL07 09 080L0 ALO R13 C8 R11 Q1Q3D2AL2DCR QCRQC1CRL 01G1G2Z1A7 R9 AB A15C4C9C0QIL Z2 06 04U1C3 R4 RL4JWZC7D5 D3R3 R5 R6R2 JW5QCBY R W2 Y C W3 W3 W2 W2 CJW4P2 JW3P4P1 W2W3 Y2 Y1YDH G C RSSTZ-8P3 SDL24VAC/R3AMP CDM/CF1STDDEHUMA09059Fig. 11 -- Interface Fan Board (IFB)SINGLE SPEED COOLING WITH HIGHERELECTRIC HEAT SPEEDThis unit can also be configured to operate with single speedcooling and a higher speed for an accessory electric heater.1. Using Fig. 11, move the two pin DEHUM jumper from the“STD” position to the “DEHUM” position.2. See Table 2 for minimum airflow for electric heat operation.Add electric heater and filter pressure drop to duct systemstatic pressure to determine total external static pressure.3. Select speed tap from Table 4 that will achieve requiredairflow from Table 2.4. Remove the vinyl cap off of the desired speed tap wire(Refer to Table 3 for color coding).5. Connect the desired speed tap wire to the “HIGH” terminalon the interface fan board (IFB).UNIT OPERATION HAZARDFailure to follow this caution may result in unit componentdamage or improper operation.To use this mode, a speed connection must be made on the“HIGH” terminal that meets or exceeds the minimumairflow found in Table 2.! CAUTIONTable 3 – Color Coding for Indoor Fan Motor LeadsBlack = High SpeedOrange = Med--High SpeedRed = Med SpeedPink = Med--Low SpeedBlue = Low SpeedELECTRICAL 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.! WARNINGCONTINUOUS FAN OPERATIONWhen the DEHUM feature is not used, the continuous fan speedwill be the same as cooling fan speed. When the DEHUM featureis used, the continuous fan will operate on IFB “LOW” speedwhen the DH control lead is not energized, or IFB “HIGH” speedwhen the DH lead is energized (see Fig. 11).COOLING SEQUENCE OF OPERATIONWith the room thermostat SYSTEM switch in the COOL positionand the FAN switch in the AUTO position, the cooling sequence ofoperation is as follows:When the room temperature rises to a point that is slightly abovethe cooling control setting of the thermostat, the thermostatcompletes the circuit between thermostat terminal R to terminals Yand G. These completed circuits through the thermostat connectcontactor coil (C) (through unit wire Y) and time delay relay(TDR) (through unit wire G) across the 24--V secondary oftransformer (TRAN).The normally open contacts of energized contactor (C) close andcomplete the circuit through compressor motor (COMP) tocondenser (outdoor) fan motor (OFM). Both motors start instantly.A set of normally open contacts on the interface fan board (IFB)are closed which energizes a circuit to the indoor fan motor (IFB).NOTE: Once the compressor has started and then has stopped, itshould not be started again until 5 minutes have elapsed.The cooling cycle remains on until the room temperature drops to apoint that is slightly below the cooling control setting of the roomthermostat. At this point, the thermostat breaks the circuit betweenthermostat terminal R to terminals Y and G. These open circuitsdeenergize contactor coil C and IFB. The condenser andcompressor motors stop. After a 90--second delay, the blowermotor stops. The unit is in a standby condition, waiting for the nextcall for cooling from the room thermostat.50VL-- A