Bard W24G2DA Installation Instructions Manual

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Bard W24G2DA Installation Instructions Manual Manual pdf 41 page image

Manual 2100-592CPage 41 of 6933. INDOOR BLOWER OPERATIONAll models have multiple speed direct drive blowermotors. If supply and return ducts are connected tothe unit, the ducts must be of adequate size. Referto the appropriate blower tables. See Tables 10, 11,12, 13, 14 and 15 for maximum static pressuresacceptable. Note the minimum CFM for coolingoperation.If voltage and duct design permit (see blower tables),single speed operation can be achieved as follows:Blower Speed Motor Change1. Disconnect power supply to unit.2. Place desired blower motor speed lead wire to“COOL” terminal of integrated furnace controlboard.3. Place desired blower motor speed lead wire to“HEAT” terminal of integrated furnace controlboard.4. Place unused blower motor speed lead wire to“UNUSED” terminal of integrated furnace controlboard.5. Energize the system in cooling and heating modesto check for proper blower operation.If it is desirable to have both HEAT/COOL blower motorspeed at the same speed, install a jumper wire between“HEAT” and “COOL” terminals of the integratedfurnace control board, and place both unused motorspeed lead wires on the two “UNUSED” terminals onthe integrated furnace control board (see Figure 18).Speeds 3-Speed Blower MotorLow RedMedium BlueHigh BlackSpeeds 3-Speed Blower MotorLow RedMedium BlueHigh BlackIsolation * OrangeIsolation * PurpleTABLE 9230 Volt Motor Speed Taps460 Volt Motor Speed Taps* On 460 volt motors, there are two motor isolation leads. The orange must connect with the black high speedblower motor lead wire for medium and low speed blower operation. The purple wire must connect withthe blue medium speed blower motor lead wire for low speed blower operation. This is all automaticallyaccomplished with blower relays HSBR, MSBR and LSBR, and speed changes are all made by changes at theintegrated furnace control board.FIGURE 18Furnace Control Board and Blower Control