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Page 5

Field Control Wiring

Figure 4. CBA38MV, CBX32 and CBX40 Air Handler Unit Typical Wiring Diagram

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Summary of Contents for 16B27

Page 1: ...ischarge can affect electronic components Take care during unit installation and service to protect the unit s electronic controls Precautions will help to avoid control exposure to electrostatic discharge by putting the unit the control and the technician at the same electrostatic potential Touch hand and all tools on an unpainted unit surface before performing any service procedure to neutralize...

Page 2: ...nly 1 Note position of all jumpers on the existing air handler control and relocate same jumpers to those positions on the new air handler control Also see Air Handler Control Button and Display on page 8 2 Configure new Control for non communicating systems using the procedures outline in Configuring Unit on page 19 For communicating systems refer to the iComfort thermostat installation instructi...

Page 3: ...ng Detecting Electric Heat Section System Operation Configuration Confirm or configure system operation using iComfort Thermostat Installer System Setup Guide Configure Electric Heat Indoor Unit NEW MAIN CONTROL Catalog Number Verify OLD CONTROL jumper settings links and wiring connections Use the same settings and wiring connections for the NEW CONTROL See Figure 10 for location of jumpers and lo...

Page 4: ...COOLING HP MODE STANDARD HEAT MODE STAGED BY TSTAT STANDARD HEAT MODE DEFAULT 85 110 115 130 HEATING MODE BLOWER SPEED ELECTRIC HT MODE 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 LOW SPEED MEDIUM LOW SPEED MEDIUM HIGH SPEED HIGH SPEED NORM NORM NORM BLOWER ADJUST SELECTION NORMAL 10 SETTING 10 SETTING EVENHEATER MODE 85 DEGREE TARGET DISCHARGE TEMPERATURE 100 DEGREE TARGET 115 DEGREE TARGET 130 DEGREE TARGET...

Page 5: ...Page 5 Field Control Wiring Figure 4 CBA38MV CBX32 and CBX40 Air Handler Unit Typical Wiring Diagram ...

Page 6: ...SISTANCE ºF OHMS 30 34 566 40 26 106 50 19 904 60 15 313 70 11 884 80 9 298 90 7 332 100 5 826 DETAIL A NOTE EVENHEAT MODE CANNOT BE ENABLED WITH HARMONY III DUE TO EACH CONTROL REQUIRING ITS OWN DISCHARGE AIR SENSOR THE AIR HANDLER CONTROL AHC HAS TWO SCREW TERMINALS MARKED DISCHARGE AIR SENSOR THE SENSOR IS REQUIRED FOR EVENHEAT OPERATION IS FIELD MOUNTED AND MUST BE ORDERED SEPARATELY CATALOG 8...

Page 7: ...from heater kit 8 L2 230VAC supply from heater kit 9 Not used This section provides information on communicating and non communicating control connections and wire run lengths Table 3 Air Handler Control Connections Communicating Item Label Function Thermostat R 24VAC i RSbus data high connection i RSbus data low connection C 24VAC command ground Outdoor Unit R 24VAC i RSbus data high connection i...

Page 8: ... Lockout Function NOTE AHC MUST BE IN IDLE MODE Single Character LED Display Action Solid Push and hold button until solid appears release button Display will blink Blinking Push and hold button until required symbol displays H A or P CONFIGURING ELECTRIC HEAT SECTIONS Solid H Release push button control will cycle the indoor blower motor on to the selected heat speed and stage the electric heat r...

Page 9: ...g string is repeated if dehumidification is active with 685 CFM d pause A 6 8 5 pause Indoor Blower only G demand Shows the current CFM delivery of the main blower in actual CFM If indoor blower is providing 1600 CFM following string is repeated A 1 6 0 0 pause Diagnostic recall Shows the last 10 stored diagnostic error codes Ini tiated by a 2 second button press Button press inter rupts the curre...

Page 10: ...rmostat indoor and outdoor units Normally indicates a malfunc tioning device E 12Y Active Subnet Controller Missing for 180 seconds This indicates a data connection has been lost between a communicating device and the communicating thermostat Device indoor or outdoor unit sends the alarm if no communication is established be tween device and thermostat within three minutes E 130 Configuration jump...

Page 11: ... limiters to protect the motor from damage caused by operating out of its designed parameters 0 through 0 80 in w g total external static pressure Air Handler Jumpers Jumpers are used for non communicating mode only Use figure 2 as reference for jumper settings If any of the ref erence jumpers are missing the air handler control will display Error code 130 and the air handler control will au tomat...

Page 12: ... and runs at 100 until demand is satisfied B Once demand is met motor runs at 100 for 45 seconds C C Motor ramps down to stop Heating Heat Pump only OFF OFF 100 CFM 100 CFM HEATING DEMAND 45 SEC 30 sec delay A B C D A When heat demand is initiated 30 seconds motor on delay starts B After the motor on delay expires motor ramps up to 100 and runs at 100 until demand is satisfied C Once demand is met...

Page 13: ...ed minimum 250 cfm Lennox iHarmony Zoning System applications minimum blower speed is 250 cfm CBX32MV 036 BLOWER PERFORMANCE 0 through 0 80 in w g External Static Pressure Range ADJUST Jumper Setting Jumper Speed Positions HEAT Speed COOL Speed 1 2 3 4 1 2 3 4 cfm cfm cfm cfm cfm cfm cfm cfm 1230 1335 1445 1545 900 1225 1380 1545 NORM 1120 1215 1315 1400 810 1125 1275 1400 1010 1185 1200 1265 730 ...

Page 14: ...1050 NORM 670 770 900 1035 425 620 825 950 580 700 800 930 385 560 735 850 NOTES The effect of static pressure filter and electric heater resistance is included in the air volumes listed First stage cooling air volume is 70 of COOL speed setting Continuous fan speed is approximately 28 38 70 and 100 Jumper selectable of the same second stage COOL speed selected minimum 250 cfm Lennox iHarmony Zoni...

Page 15: ...eed selected minimum 450 cfm Lennox iHarmony Zoning System applications minimum blower speed is 450 cfm CBX40UHV 048 AND CBX40UHV 060 BLOWER PERFORMANCE 0 through 0 80 in w g External Static Pressure Range ADJUST Jumper Setting Jumper Speed Positions HEAT Speed COOL Speed 1 2 3 4 1 2 3 4 cfm cfm cfm cfm cfm cfm cfm cfm 1850 1960 2090 2150 1625 1820 2055 2145 NORM 1705 1800 1900 2005 1425 1625 1805...

Page 16: ...cted minimum 250 cfm Lennox iHarmony Zoning System applications minimum blower speed is 250 cfm CBA38MV 042 BLOWER PERFORMANCE 0 through 0 80 in w g External Static Pressure Range ADJUST Jumper Setting Jumper Speed Positions HEAT Speed COOL Speed 1 2 3 4 1 2 3 4 cfm cfm cfm cfm cfm cfm cfm cfm 1100 1320 1540 1760 1100 1320 1540 1760 NORM 1000 1200 1400 1600 1000 1200 1400 1600 900 1080 1260 1440 9...

Page 17: ...hermostat and Single Stage Outdoor Unit Operating Sequence Operating Sequence System Demand System Response System Condition Step Thermostat Demand Relative Humidity Comp Air Han dler CFM COOL Comments Y1 Y2 O G W1 W2 Status D NO CALL FOR DEHUMIDIFICATION Normal Operation 1 On On On Acceptable 24 VAC High 100 Compressor and indoor air handler follow ther mostat demand BASIC MODE Only active on a Y...

Page 18: ...point Dehumidification call 2 On On On On Demand 0 VAC High 70 Dehumidification call ONLY 1 On On On On Demand 0 VAC High 70 ComfortSense 7500 thermostat will keep outdoor unit energized after cooling temperature setpoint has been reached in order to maintain room humidity setpoint NOTE Allow to over cool 20F from cooling set point Room Thermostat Calls for First and Second Stage Cooling BASIC MOD...

Page 19: ...ely de energize the corresponding pilot relay s At the completion of all heating demands the indoor blower will run for an additional 10 seconds before de energizing No Yes NOTE If the call for lower heat section is removed AHC will automatically de energize higher heat sections Indoor blower will immediately start to delivery CFM as set by heating mode jumper on board with activation of first ele...

Page 20: ...seconds Yes No IMPORTANT Field replacement controls may need to be manually configured to validate air handler unit size code AIR HANDLER MODEL CBX32MV 018 024 CBX32MV 024 030 CBX32MV 036 CBX32MV 048 CBX32MV 060 CBX32MV 068 CBX40UHV 024 CBX40UHV 030 CBX40UHV 036 CBX40UHV 042 CBX40UHV 048 CBX40UHV 060 UNIT SIZE CODE 0 1 2 3 4 5 6 7 8 9 L U 1 When the correct Unit Size Code is displayed RELEASE push...

Page 21: ... detect number of electric heat sections Electric heat section may be wired to energize more than one element 2 AHC waits for maximum of ten seconds to detect electric heat 22 volt DC relay coils are energizing A If relay coil current is detected within ten seconds AHC will show a1on the single character LED display indicating that the first stage has been detected As each additional heat section ...

Page 22: ... Stage First Electric Heat Section H1 Heat Pump First and Second Stage ond Electric Heat Section H2 if number of electric heater sections detected is more than two Heat Pump First and Second Stage First Electric Heat Section H1 Second Electric Heat Section H2 if number of electric heater sections detected is more than two W1 and or W2 First Electric Heat Section H1 First Electric Heat Section H1 S...

Page 23: ... Delay Timer Finished or last change was up stage Delay Timer Finished or last change was down stage Above Turn OFF Electric Heat Section Adjust Target Discharge Air Temperature Turn ON one Electric Heat section Adjust Target Discharge Air Temperature NOTE Optional Outdoor Thermostat Wired between R and W3 will lockout electric elements 3 4 and 5 Y1 ON and Y2 OFF Activate Y2 Below No Yes Note 1 Ac...

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