Lennox CBX25UHV 10 Series Installation And Service Procedure Download Page 28 | Manualshive

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Page 28

VI-WIRING DIAGRAM

Figure 37. Low Voltage Connections (Variable-Speed Motor) - Field Wiring

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Summary of Contents for CBX25UHV 10 Series

Page 1: ...ations 29 The CBX25UHV series units are high efficiency blower coils Several models are available in sizes ranging from 1 1 2 through 5 tons The CBX25UHV is designed for HFC 410A refrigerant only CBX2...

Page 2: ...7 3 4 451 17 432 16 1 2 419 20 3 4 527 16 406 5 1 2 140 40 1 2 1029 18 1 2 470 22 559 6 152 14 357 5 1 2 140 13 1 2 343 17 3 4 451 17 432 16 1 2 419 20 3 4 527 16 406 3 5 8 92 inches mm inches mm inch...

Page 3: ...7 8 505 20 3 4 527 19 3 8 492 43 1092 18 1 2 470 22 559 6 152 16 406 5 1 2 140 17 432 16 1 2 419 20 3 4 527 16 406 40 1 2 1029 18 1 2 470 22 559 6 152 14 357 5 1 2 140 17 432 16 1 2 419 20 3 4 527 16...

Page 4: ...4 9 Blower Motor Full Load Amps 3 9 3 9 3 9 3 9 SPECIFICATIONS General Data Model Number CBX25UHV 042 CBX25UHV 048 CBX25UHV 060 Nominal tonnage 3 5 4 5 Connections Suction Vapor line o d in sweat 7 8...

Page 5: ...e external static range A particular CFM can be obtained by positioning jumpers COOL HEAT and ADJUST on the BDC3 control The jumpers are labeled 1 2 3 and 4 This indicates the selected air volume CFM...

Page 6: ...RMAL and with their respective CFM volumes Notice that the normal adjustment setting for heat speed position 3 is 1000 CFM The adjustment setting for that position is 1100 CFM and for the adjustment s...

Page 7: ...1100 1330 NORM 590 795 1000 1200 390 550 680 830 580 800 1000 1200 520 730 895 1075 340 475 620 750 500 700 900 1090 NOTES The effect of static pressure filter and electric heater resistance is includ...

Page 8: ...he second stage COOL speed setting Continuous fan speed is approximately 50 of second stage COOL speed setting Lennox Harmony III Zone Control Applications Minimum air handler speed is approximately 4...

Page 9: ...gh 60 65 70 Thermostat will try to maintain room humidity setpoint by allowing the room space to maintain a cooler room thermostat setpoint Room Thermostat Calls for First and Second Stage Cooling BAS...

Page 10: ...50 motor ramps down to stop A B OFF OFF C D E I APPLICATION Match all major blower coil components according to Lennox recommendations failure to comply voids warranty Refer to the Product Specificat...

Page 11: ...bank of capacitors inside the controller Wait give minutes minimum after turning off power to allow capacitors to discharge It is normal for a variable speed motor to gently rock back and forth at th...

Page 12: ...ates the risk of applying power to the wrong pins Since there is very little blower compartment space removing the plug from the motor and the service tool plug is easier than trying to use jumpers to...

Page 13: ...discharge applications NOTE When the unit is installed in horizontal applications a secondary drain pan is recommended Refer to local codes Units installed in a horizontal position must be sloped sli...

Page 14: ...rom resting properly in the compartment 4 Remove the no heat seal plate in the air handler frame 5 Slide the electric heat section into the air handler Be careful that the heating elements do not rub...

Page 15: ...ange the applicable circuit breakers orientation for right hand discharge proceed to step 2 2 Locate the one clip which is located on the right side of each breaker see figure 15 The clip secures the...

Page 16: ...g unit and heat pump applications Figure 18 is a diagram of the air handler connections and the heater elements high voltage wiring 1 Make wiring connections as follows Heaters equipped with circuit b...

Page 17: ...cy and air flow 3 Place the unit in the desired location and slope unit as previously mentioned Connect return and supply air plenums using sheet metal screws 4 Install units that have no return air p...

Page 18: ...ing field modifications are required 1 Remove and set aside blower and coil access covers 2 Remove bracket s securing pan s to unit as illustrated in figures 25 and 26 REMOVE BRACKET SECURING MAIN DRA...

Page 19: ...installed in the condensate drain lines primary and auxiliary if used Traps prevent the blower from drawing air through the drain lines into the air supply IMPORTANT A field fabricated secondary drain...

Page 20: ...the outlet will be easily noticed by the homeowner Refer to local codes for drain trap requirements on the secondary drain line 5 Check again to ensure drain ports and drain pan are free of all debri...

Page 21: ...ER DRAIN PAN TRAPS MUST BE DEEP ENOUGH TO OFFSET MAXIMUM STATIC DIFFERENCES GENERALLY TWO INCHES 51MM DRAIN LINE SHOULD SLOPE A MINIMUM OF ONE INCH PER 10 FEET 25MM PER 3 METERS NOTE WHEN A AIR HANDLE...

Page 22: ...8 3 4 19 1 2 13 3 4 19 DUCT FLANGE CABINET DOOR FLANGE UNIT SIZE Figure 33 Cabinet and Duct Flange E Connecting Refrigerant Lines Refrigerant lines must be connected by a qualified technician in accor...

Page 23: ...coil Take care to protect the cabinet and internal components as detailed in figure 34 4 To avoid damaging the rubber grommets in the cabinet while brazing slide the rubber grommets over the refriger...

Page 24: ...INE SETS SHOULD BE ROUTED TO ALLOW FILTER ACCESSIBILITY NOTE CBX25MV SERIES UNITS USE NITROGEN OR DRY AIR AS A HOLDING CHARGE IF THERE IS NO PRESSURE WHEN THE RUBBER PLUGS ARE REMOVED CHECK THE COIL F...

Page 25: ...B BETWEEN THE 9 O CLOCK AND 3 O CLOCK POSITIONS ON LINES AND LARGER IN DIA METER INSTALL THE SENSING BULB IN EITHER THE 4 O CLOCK OR 8 O CLOCK POSITION NEVER INSTALL THE SENSING BULB ON THE BOTTOM OF...

Page 26: ...WARNING Electric shock hazard Can cause injury or death Unit must be grounded in accordance with national and local codes Connect ground wire to ground terminal marked GND Line voltage is present at...

Page 27: ...rom the 240 volt terminal on the transformer to the 208 volt terminal on the transformer See figure 36 208 240 VOLT TRANSFORMER PRIMARY SECONDARY 240 Volts 208 Volts Figure 36 Converting Unit from 240...

Page 28: ...Page 28 VI WIRING DIAGRAM Figure 37 Low Voltage Connections Variable Speed Motor Field Wiring...

Page 29: ...ng Mode Return Duct Temperature ___________ THERMOSTAT Adjusted and Programmed Return External Static ______ ______ Total External Static ______ ______ 6 Supply Duct Temperature ___________ Temperatur...

Page 30: ...ternal Static ______ ______ 6 6 Supply Duct Temperature ___________ Temperature Drop ___________ TEMPERATURE RISE Heating Mode Return Duct Temperature __________ Supply Duct Temperature __________ Tem...

Page 31: ...e outdoor unit The air handler C Common terminal is connected to terminal C in the outdoor unit The contactor in the outdoor closes to bring on the compressor and outdoor fan motor Heating First Stage...

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