Bard W42AC-A Installation Instructions Manual

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Bard W42AC-A Installation Instructions Manual Manual pdf 33 page image

Manual 2100-692Page 33 of 40TABLE 13Recommended AirflowFIGURE 26Speed TapsSpeed Tap 1: Vent SpeedSpeed Tap 2: Balanced Climate SpeedSpeed Tap 3: Default SpeedSpeed Tap 4: Medium SpeedSpeed Tap 5: High SpeedManual 2100-467HPage 23 of 23FIGURE 11TROUBLESHOOTING GE X13-SERIES ECM2.3™ MOTORS CONT’D.Model X13 Communication DiagnosticsThe X13 motor is communicated through 24 VAC low voltage(Thermostat Control Circuit Wiring).1. Start with unit wiring diagram to confirm properconnections and voltage (see Figure 11).2. Initiate a demand from the thermostat and check thevoltage between the common and the appropriate motorterminal (1-5). ("G" input is typically on terminal #1, butrefer to wiring diagram!)a. If the low voltage communication is not present, checkthe demand from the thermostat. Also check theoutput terminal and wire(s) from the terminal strip orcontrol relay(s) to the motor.b. If the motor has proper high voltage as identifiedabove (Motor not Running #1), and proper low voltageto a programmed terminal, and is not operating, themotor is failed, and will require replacement.24VAC "R" Signal throughthermostat output.24VAC Common24VAC Common24VAC "R" Signal throughthermostat output.24VAC Common24VAC "R"signal throughthermostat outputModelNominalRatedCFM*NominalRatedESP*RecommendedAirflow RangeFactorySpeedConnectionW42AC 1350 .15 1250 - 1600DefaultW48AC 1550 .20 1450 - 1750W60AC 1750 .20 1650 - 2000W72AC 1900 .25 1800 - 2100* Rated CFM and ESP on factory speed connection.Setting Unit AirflowThe unit is set from the factory at the default speed.Most units have three selectable cooling speed tapsthat can be utilized. The default speed is the lowestcooling speed. The two higher speed taps can be usedfor higher duct static applications so that the unit canmaintain the recommended airflow as shown in Table13. The higher speeds can also be used when highersensible cooling is desired. To change to the higherspeed taps, move the orange/black wire on the blowerspeed terminal block to either MED or HI. Refer toTable 15 on page 35 for the corresponding airflow ofeach tap. Set the unit duct static based on the highestairflow that the unit will run at.NOTE: Be sure to adjust the system static orblower speed to maintain airflows above theminimum recommendations to prevent freezeup conditions if Balanced Climate mode isactivated.Do not operate the unit in Balanced Climate modeif running high static applications as indicated inthe blower performance table. If Balanced Climatemode is activated as described on page 18, the unitwill run in this mode at all times unless there is acall for ventilation, electric heat or 2nd stage coolingfrom a 2-stage thermostat. At that time, the unit willautomatically activate a higher speed tap.Blower SpeedsThe ECM motor blower speeds are communicatedthrough 24VAC low voltage signals from the low voltageterminal block inside the control panel area to speedtaps. Each speed tap is programmed by Bard at thefactory to different motor torque settings (see Figure 26).UnitOperationThermostat Inputs – 24VAC Speed Taps Blower Speed CompressorOperationG Y1 Y2 W1 W2 A D 1 2 3-4-51Blower Only X X Vent/Blower Only OffBalanced Climate Cooling X X X X Balanced Climate OnFull Load Cool X X X X X X Lo/Med/Hi On1st Stage Heat X X Lo/Med/Hi Off2nd Stage Heat X X X Lo/Med/Hi OffDehumidify2 X X X Balanced Climate On¹ Fan speed is selectable through the blower speed control terminal block. LO (default), MED or HI speeds can be used.2 Dehumidification operation is disabled when a call for heating or cooling occurs. Unit runs at Balanced Climate speedduring dehumidification operation.TABLE 14Blower Speeds for Unit Operational ModesFive factory programmed speed taps (torque settings)are available for the motor, and are selected throughdifferent unit modes of operation. These modes areenergized by 24VAC signals from the low voltageterminal block located inside the control panel by athermostat or other controlling device.Multiple motor speed taps may be energizedsimultaneously by 24VAC power during different modesof operation. The highest number speed tap energizedtakes priority with 5 being the highest and 1 beingthe lowest. See Table 14 for the corresponding blowerspeeds with the different modes of operation.