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CBX32MV

SENSOR CONNECTIONS AND WIRING
REQUIREMENTS

The following are sensor connections and wiring
requirements for the discharge air and outdoor air sensors.

Discharge Sensor (DAT)

The Air Handler Control has two screw terminals marked

Discharge Air Sensor

. The sensor is REQUIRED for

EVENHEAT operation and is field installed and ordered
separately using Lennox Catalog # 88K38.

In the EVENHEAT mode, the discharge air sensor cycles
the electric heating elements as needed to maintain the Air
Handler control EVENHEAT jumper selected discharge
setpoint.

The discharge air sensor should be mounted downstream
of the electric heat elements as illustrated in Figure 26,
Detail A. It must be placed in a location with unobstructed
airflow, where other accessories (such as humidifiers, UV
lights, etc.) will not interfere with its accuracy.

Wiring distance between the Control and the discharge air
sensor should not exceed 10 feet (3 meters) when wired
with 18-gauge thermostat wire.

Outdoor Air Sensor

This is a two screw terminal for connection to a Lennox
X2658 outdoor temperature sensor. The Control takes no
action on the sensor status other than to communicate the
temperature to the RSBus network. Wiring distance
between the Control and outdoor temperature sensor
should not exceed 200 feet when wired with 18-gauge
thermostat wire.

Minimum temperature: -40ºF (-40ºC)

Maximum temperature: 70ºF (158ºC)

AIR HANDLER CONTROL 9-PIN CONNECTOR (P8)

1.

Air Handler (no electric heat) — Two wire factory
harness (wired to pins 7 and 8) which provides 230
VAC power to Air Handler Control.

2.

Air Handler (with electric heat) — Eight wire factory
harness (all pin positions are wired as noted in Table 5).

NOTE -

See Figure 26, Detail B for wire colors.

Table 5. Electric Heat Connection (P8)

Position

Function / Description

1

Heat stage 1 relay coil

2

Heat stage 2 relay coil

3

Relay coil return

4

Heat stage 3 relay coil

5

Heat stage 4 relay coil

6

Heat stage 5 relay coil

7

L1 230VAC supply from heater kit

8

L2 230 VAC supply from heater kit

9

Not Used

CONTROL CONNECTIONS AND WIRING
REQUIREMENTS

This sections provides information on communicating and
non-communicating control connections and wire run
lengths.

Table 6. Air Handler Control Connections —

Communicating

Label

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-

RSbus data low connection

C

24VAC command (ground)

Link

i+

Not used.

i-

Table 7. Run Length — Communicating

Wire Run Length

AWG #

Insulation/Core Types

Maximum length of wiring
for all connections on the
RSbus is limited to 1500
feet (457 meters).

18

Color-coded, temperature
rating 95

º

F (35

º

C) minimum,

solid core. (Class II Rated
Wiring)

«
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26
27
28
29
30
...
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Summary of Contents for CBX32MV-018/024

Page 1: ...Connections 19 Condensate Drain Requirements 22 Inspecting and Replacing Filters 23 Sealing the Unit 23 Field Control Wiring 24 Air Handler Control Button Display and Jumpers 31 Configuring Unit 36 Error Code Recall Mode 43 Indoor Blower Test 44 Checkout Procedures 44 Operation 45 Maintenance 45 Cabinet Insulation 45 Sequence of Operations 47 Unit Components 60 Electric Heat ECB40 66 This indoor u...

Page 2: ...h 208 230V 1ph 208 230V 1ph Maximum overcurrent protection unit only 2 15 15 15 Minimum circuit ampacity unit only 5 5 5 General Data Model Number CBX32MV 048 CBX32MV 060 CBX32MV 068 Nominal cooling capacity tons kW 4 14 1 5 17 6 5 17 6 Refrigerant HFC 410A HFC 410A HFC 410A Connections in mm Suction vapor line sweat 7 8 22 2 1 1 8 28 1 1 8 28 Liquid line sweat 3 8 9 5 3 8 9 5 3 8 9 5 Condensate d...

Page 3: ... 1 cfm 2 cfm 3 cfm 4 cfm 1 cfm 2 cfm 3 cfm 4 cfm 715 855 1000 1130 465 690 900 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 settings Continuous fan speed is approximately 28 38 70 and 100 Jumper selectable o...

Page 4: ... Tap 4 148 170 195 207 230 248 272 282 306 CBX32MV 024 030 BLOWER PERFORMANCE 0 through 0 80 in w g External Static Pressure Range AJUST Jumper Setting Jumper Speed Positions HEAT Speed COOL Speed 1 cfm 2 cfm 3 cfm 4 cfm 1 cfm 2 cfm 3 cfm 4 cfm 800 935 1070 1210 660 880 1100 1320 NORM 725 850 975 1100 600 800 1000 1200 655 765 880 990 540 720 900 1080 NOTES The effect of static pressure filter and...

Page 5: ...p 4 145 175 215 245 280 325 355 410 450 CBX32MV 036 BLOWER PERFORMANCE 0 through 0 80 in w g External Static Pressure Range AJUST Jumper Setting Jumper Speed Positions HEAT Speed COOL Speed 1 cfm 2 cfm 3 cfm 4 cfm 1 cfm 2 cfm 3 cfm 4 cfm 1230 1335 1445 1545 900 1225 1380 1545 NORM 1120 1215 1315 1400 810 1125 1275 1400 1010 1185 1200 1265 730 1000 1135 1265 NOTES The effect of static pressure filt...

Page 6: ...0 310 335 355 380 405 430 CBX32MV 048 and CBX32MV 060 BLOWER PERFORMANCE 0 through 0 80 in w g External Static Pressure Range AJUST 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 NORM 1850 1960 2090 2150 1625 1820 2055 2145 1705 1800 1900 2005 1425 1625 1805 2005 1560 1625 1720 1770 1205 1375 1555 1725 NOTES The effect of static pressure...

Page 7: ...415 445 465 505 540 Tap 4 375 420 440 475 515 550 575 610 645 CBX32MV 068 BLOWER PERFORMANCE 0 through 0 80 in w g External Static Pressure Range AJUST Jumper Setting Jumper Speed Positions HEAT Speed COOL Speed 1 cfm 2 cfm 3 cfm 4 cfm 1 cfm 2 cfm 3 cfm 4 cfm 1875 1975 2090 2150 1640 1840 2075 2150 NORM 1760 1825 1920 2030 1465 1625 1800 2000 1550 1650 1725 1800 1250 1390 1560 1720 NOTES The effec...

Page 8: ...20 355 410 455 505 535 585 Tap 3 345 375 415 460 505 560 610 670 735 Tap 4 445 510 560 595 665 725 790 845 865 CBX32MV 068 BLOWER MOTOR WATTS AT Minus SETTING Adjust Jumper at Setting Jumper Speed Positions Motor Watts Various External Static Pressures in wg Pa 0 0 0 1 25 0 2 50 0 3 75 0 4 100 0 5 125 0 6 150 0 7 175 0 8 200 HEAT Speed Tap 1 215 245 285 325 375 415 460 495 540 Tap 2 255 295 325 37...

Page 9: ... 35 35 35 240 6 0 20 500 4 0 36 40 36 40 8 kW 5 lbs ECB40 8 34W89 Terminal Block ECB40 8CB 34W92 50A Circuit breaker 1 208 6 0 20 500 4 0 41 45 41 45 220 6 7 22 900 4 0 43 45 43 45 230 7 3 25 100 4 0 45 45 45 45 240 8 0 27 300 4 0 47 50 47 50 9 kW 5 lbs ECB40 9CB 34W93 60A Circuit breaker 2 208 6 8 23 100 4 0 46 50 220 7 6 25 800 4 0 48 50 230 8 3 28 200 4 0 50 50 240 9 0 30 700 4 0 52 60 12 5 kW ...

Page 10: ... kW 5 lbs ECB40 9CB 34W93 60A Circuit breaker 2 208 6 8 23 100 4 0 46 50 220 7 6 25 800 4 0 48 50 230 8 3 28 200 4 0 50 50 240 9 0 30 700 4 0 52 60 12 5 kW 10 lbs ECB40 12 5CB 34W94 1 30A 1 45A Circuit breaker 2 208 9 4 32 000 4 0 24 38 25 40 220 10 5 35 800 4 0 25 40 25 40 230 11 5 39 200 4 0 26 42 30 45 240 12 5 42 600 4 0 27 44 30 45 15 kW 12 lbs ECB40 15CB 34W95 1 35A 1 60A Circuit breaker 2 2...

Page 11: ...r Full Load Amps 3 Minimum Circuit Ampacity 5 Maximum Overcurrent Protection Circuit 1 Circuit 2 Circuit 3 Circuit 1 Circuit 2 Circuit 3 4 kW 4 lbs ECB40 4 55W89 Terminal Block ECB40 4CB 55W90 35A Circuit breaker 1 208 3 0 10 250 7 4 27 30 220 3 4 11 450 7 4 28 30 230 3 7 12 550 7 4 29 30 240 4 0 13 650 7 4 30 30 5 kW 4 lbs ECB40 5 34W87 Terminal Block ECB40 5CB 34W90 35A Circuit breaker 1 208 3 8...

Page 12: ...38 400 7 4 48 50 220 12 6 43 000 7 4 51 60 230 13 5 47 000 7 4 52 60 240 15 0 51 200 7 4 54 60 20 kW 19 lbs ECB40 20CB 35W01 2 35A Circuit breaker 2 208 15 0 51 200 7 4 35 26 40 30 220 16 8 57 300 7 4 37 28 40 30 230 18 4 62 700 7 4 38 29 40 30 240 20 0 68 200 7 4 39 30 40 35 25 kW 19 lbs ECB40 25CB 35W02 1 50A 1 40A Circuit breaker 2 208 18 8 64 100 7 4 42 33 45 35 220 21 0 71 700 7 4 44 34 45 35...

Page 13: ... 8 16 5 8 16 5 8 16 LOW VOLTAGE RIGHT SIDE LINE VOLTAGE LEFT SIDE DOWNFLOW POSITION 1 25 UPFLOW POSITION CONDENSATE DRAINS 2 UPFLOW AND DOWNFLOW FILTER ACCESS FILTER ACCESS H G H G LINE VOLTAGE INLETS TOP AND LEFT SIDE 5 8 16 5 8 16 KNOCKOUT FOR OPTIONAL HEALTHY CLIMATE GERMICIDAL UVC LIGHT KNOCKOUT FOR OPTIONAL HEALTHY CLIMATE GERMICIDAL UVC LIGHT CBX32MV Model Dimensions Upflow Downflow Left and...

Page 14: ...HT SIDE 5 3 8 137 4 3 8 111 LIQUID LINE SUCTION LINE SUPPLY AIR OPENING FILTER LOW VOLTAGE INLETS TOP AND LEFT SIDE END VIEW BLOWER B C D COIL 3 4 19 3 4 19 3 4 19 RETURN AIR OPENING F E 5 8 16 5 8 16 5 8 16 END VIEW AIR FLOW OPTIONAL ELECTRIC HEAT FIELD INSTALLED LINE VOLTAGE INLETS BOTTOM AND LEFT SIDE Horizontal Position Right Hand Air Discharge FILTER ACCESS FILTER ACCESS 5 3 4 146 1 1 2 38 1 ...

Page 15: ...r contaminants to enter the return air system or to be mixed with air that will be supplied to the living space Use sheet metal screws and joint tape or duct mastic to seal return air system to air handler In platform installations the air handler should be sealed airtight to the return air plenum A door must never be used as a portion of the return air duct system The base must provide a stable s...

Page 16: ...r Connected to the overflow drain outlet of the air handler drain pan Use the following procedures to configure the unit for horizontal right hand discharge operations NOTE For horizontal applications a secondary drain pan is recommended Refer to local codes NOTE 068 Model Only Before operating the unit remove access panels and the horizontal drip shield and the corrugated padding between the blow...

Page 17: ...GE APPLICATION Use the following procedures to configure the unit for horizontal left hand discharge operations NOTE For horizontal applications a secondary drain pan is recommended Refer to local codes NOTE 068 Model Only Remove access panels and horizontal drip shield from the corrugated padding between the blower and coil assembly Discard the corrugated padding and the downflow drip shields fro...

Page 18: ...d Use securing screws no longer than 1 2 inch 12 7mm to avoid damage to coil or filter as illustrated in Figure 4 on page 17 Connect return and supply air plenums as required using sheet metal screws DOWNFLOW APPLICATION Use the following procedures to configure the unit for downflow operations CAUTION If electric heat section with circuit breakers ECB29 ECB31 is applied to downflow CBX32MV unit t...

Page 19: ... on page 19 9 Cut an opening appropriately sized for combustible base Base dimensions are illustrated in figure 10 After opening has been cut set the additive base into opening Connect outlet air plenum to the additive base Set the unit on the additive base so flanges of the unit drop into the base opening and seal against the insulation strips The unit is now locked in place Install return air pl...

Page 20: ...essurized may result in ignition of the refrigerant and oil mixture check the high and low pressures before unbrazing IMPORTANT To prevent the build up of high levels of nitrogen when purging be sure it is done in a well ventilated area Purge low pressure nitrogen 1 to 2 psig through the refrigerant piping during brazing This will help to prevent oxidation and the introduction of moisture into a s...

Page 21: ...ENTS NOTE REFRIGERANT LINE SETS SHOULD BE ROUTED TO ALLOW FILTER ACCESSIBILITY NOTE CBX32MV 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 FOR LEAKS BEFORE INSTALLING REFER TO INSTRUCTIONS PROVIDED WITH OUTDOOR UNIT FOR LEAK TESTING EVACUATING AND CHARGING PROCEDURES FLOW REGULATED NITROGEN AT 1 TO 2 PSIG THROUGH TH...

Page 22: ...oduct Applications for assistance Condensate Drain Requirements IMPORTANT After removal of drain pan plug s check drain hole s to verify that drain opening is fully open and free of any debris Also check to make sure that no debris has fallen into the drain pan during installation that may plug up the drain opening MAIN DRAIN Connect the main drain and route downward to drain line or sump Do not c...

Page 23: ...PPLE 2 CUT TO REQUIRED LENGTH SIDE VIEW Figure 13 Typical Main and Overflow Drain Installations Inspecting and Replacing Filters IMPORTANT Filter access door must be in place during unit operation Excessive warm air entering the unit from unconditioned space may result in water blow off problems Filters may be duct mounted or installed in the cabinet A filter is installed at the factory Note that ...

Page 24: ...Standard C22 1 and local building codes Refer to following wiring diagrams See unit nameplate for minimum circuit ampacity and maximum over current protection size WARNING Run 24V Class II wiring only through specified low voltage opening Run line voltage wiring only through specified high voltage opening Do not combine voltage in one opening Select the proper supply circuit conductors in accordan...

Page 25: ... ÉÉÉÉÉÉ ÉÉÉÉÉÉ ÉÉÉÉÉÉ ÉÉÉÉÉÉ ÉÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ ÉÉÉÉÉ iComfortt THERMOSTAT Air Handler or Furnace Control W3 H O C L Y2 DS DH G R Y1 W2 W1 R Y1 L C Heat Pump or Air Conditioner Control Y2 i W O i DS R C i i R C i i R C i i Outdoor sensor for outdoor temperature display Optional OUTDOOR AIR SENSOR ...

Page 26: ...WHEN USING COMFORTSENSE 7000 CATALOG Y2081 Figure 15 Control Field Wiring Cooling Application Non Communicating HEAT PUMP UNIT TWO STAGE X2658 OUTDOOR SENSOR IS REQUIRED FOR OUTDOOR TEMPERATURE DISPLAY DEW POINT CONTROL HEAT PUMP AND DUAL FUEL BALANCE POINTS COMFORTSENSE 7000 R R R W3 H W2 W2 W1 W1 W1 O O O L L Y1 Y1 Y1 Y2 Y2 G G C C C T T D B Y2 DS O D SENSOR X2658 Y2 OUT BL 1 1 CUT ON BOARD LINK...

Page 27: ...IT CAT 47W97 IS REQUIRED WHEN CONNECTING THE COMFORTSENSE 7000 CATALOG Y0349 WITH THE LSOM 2 RESISTOR KIT NOT REQUIRED WHEN USING COMFORTSENSE 7000 CATALOG Y2081 Figure 17 Control Field Wiring Cooling Application Humiditrol and Second Stage Outdoor Fan Relay Wiring Non Communicating YELLOW BLUE NOT REQUIRED FOR SINGLE STAGE RED BLACK PURPLE PURPLE BLACK BLUE RED FAN RELAY NOT REQUIRED WITH SINGLE ...

Page 28: ...or should not exceed 200 feet when wired with 18 gauge thermostat wire Minimum temperature 40ºF 40ºC Maximum temperature 70ºF 158ºC AIR HANDLER CONTROL 9 PIN CONNECTOR P8 1 Air Handler no electric heat Two wire factory harness wired to pins 7 and 8 which provides 230 VAC power to Air Handler Control 2 Air Handler with electric heat Eight wire factory harness all pin positions are wired as noted in...

Page 29: ...al shall be capable of providing the power to the thermostat and all the associated loads O Input Output Room thermostat inputs 24 volts to the O terminal on the indoor control The O terminal is connected to R by link Solid jumper on control that would be cut if unit was a heat pump The room thermostat communicated with the indoor control The indoor con trol outputs 24 volts on its O terminals whi...

Page 30: ...STAT 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 85 110 115 130 ENABLED WITH OPTIONAL DISCHARG...

Page 31: ...position Default H terminal is active if heat demand is present and indoor blower is running If jumper is installed in AUTO Humidification position H terminal is energized whenever indoor blower is running 2 EvenHeat Target Discharge Air Temperature selection is used to set discharge air temperatures for EvenHeat operation NOTE Optional Discharge Air Temperature Sensor Lennox Catalog 88K38 is REQU...

Page 32: ... until demand is satisfied D Once demand is met motor runs at 50 for 30 seconds E Motor ramps down to stop DISPLAY An on board single character LED display see Figure 19 for LED display location indicates general system status information such as mode of operation indoor blower CFM and error codes Multi character strings are displayed with character ON for one second OFF for 0 5 seconds and one se...

Page 33: ...capacity Blinking p 10 When the correct Unit Sized Code is displayed RELEASE push button Selected code will flash for 10 second period 10 During ten second period HOLD push button until code stops blinking three seconds minimum 10 Air Handler Control will store code in memory and exit current active mode LED display will go blank and then the Unit Size Code will display for 2 to 5 seconds NOTE If ...

Page 34: ...ng is lost Compare outdoor sensor resistance to tempera ture resistance charts in unit installation instructions Replace sensor pack if neces sary At the beginning of any configuration the air handler control will detect the presence of the sensor s If detected reading in range appropriate feature will be set as installed and shown in the About screen The alarm fault will clear upon con figuration...

Page 35: ...l in the electric heat section did not energize The air handler will operate on first stage electric heat until the issue is resolved Heat section stage 2 failed same as code 351 Pilot relay contacts did not close or the relay coil in the electric heat section did not energize The air handler will oper ate on stage 1 heat only The alarm clears after stage 2 relay is detected E353 Critical There is...

Page 36: ...ll 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 Control will automatically de energize higher heat sections Indoor blower will immediately start to delivery CFM as set by heating mode jumper on AHC with activation of first electric heat pilot relay Pilot relays on AHC are energized one at a ti...

Page 37: ...for each different air handler model for three seconds Yes No IMPORTANT Field replacement controls may need to be manually configured to validate air handler unit size code _ _ P P 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 Wh...

Page 38: ...tically 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 a 1 on the single character LED display indicating that the first stage has been detected As each additional heat...

Page 39: ... two Y1 and Y2 W1 and or W2 Heat Pump First and Second Stage First Electric Heat Sec tion H1 Heat Pump First and Second Stage First Electric Heat Section Second 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...

Page 40: ...30ºF 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 ...

Page 41: ...and heat pump 2 Set Blower Adjust Selection jumper pin 3 Set Cooling Mode Blower Ramping jumper pin Cooling calls All ramping profiles are active Heating calls Only ramping profiles 1 and 2 are active If profiles 3 or 4 are selected Control will default to profile 1 A Profile 1 does not provide any ramping profiles B Profile 2 provides a 30 second indoor blower ON delay at the start of a heat pump...

Page 42: ...nergize indoor blower per ramping profile No Yes Control on board link must be cut between Y1 and Y2 to allow 2 stage cooling operation Air Handler Control Indoor Blower Mode Speed and Profiles settings 1 Set Cooling Mode Blower Speed jumper pin 2 Set Cooling Mode Blower Ramping jumper pin 3 Set Blower Adjust Selection jumper pin Single or Two Stage Unit NOTE The outdoor unit control directly cont...

Page 43: ... release button To clear error codes stored in memory continue to hold push button while the solid three horizontal bars are displayed Release button when solid is displayed Solid c starts blinking on single character LED display The display will blink for up to ten seconds During this time press the button and release to confirm deletion of the error code history As confirmation Control will disp...

Page 44: ...it with separate drain for units installed above a finished ceiling or in any installation where condensate overflow could cause damage Have ALL unused drain pan ports been properly plugged Has the condensate line been properly sized run trapped pitched and tested Is the duct system correctly sized run sealed and insulated Have all cabinet openings and wiring been sealed Is the indoor coil factory...

Page 45: ...g stage W2 on the thermostat subbase EMERGENCY HEAT HEATING HEAT PUMP If the selector switch on the thermostat is set to the emergency heat position the heat pump will be locked out of the heating circuit and all heating will be electric heat if applicable A jumper should be placed between W2 and E on the thermostat subbase so that the electric heat control will transfer to the first stage heat on...

Page 46: ...pped torn or separated from the cabinet walls the surrounding ambient air will affect the inside surface temperature of the cabinet The temperature humidity difference between the inside and outside of the cabinet can cause condensation on the inside or outside of the cabinet which leads to sheet metal corrosion and subsequently component failure REPAIRING DAMAGED INSULATION Areas of condensation ...

Page 47: ...which supplies 24VAC to the indoor thermostat and electric heat if used HEATING 1 W1 of the thermostat provides a W1 demand to the Control The Control outputs a 22VDC signal to the K32 relay contained in the ECB40 heat section See electric heat diagrams for operation 2 Control energizes blower motor B3 on heating speed COOLING 1 See Table 13 for cooling sequence of operation ...

Page 48: ...T JUMPERS THERMOSTAT DEMAND and BLOWER SPEED Single Speed Condensing Unit Y1 to Y2 O to R See table 14 Two Speed Condensing Unit O to R See table 15 Single Speed Heat Pump Y1 to Y2 See table 14 Two Speed Heat Pump NONE See table 15 CBX32MV COOLING OPERATION AND JUMPER SUMMARY OPTIONAL ACCESSORIES WITHOUT ComfortSense 7000 WITH HARMONY III UNIT JUMPERS SEQUENCE OF OPERATION Single or Two Speed Cond...

Page 49: ...ure setpoint has been reach in order to maintain room humidity setpoint NOTE Allow to over cool 20F from cooling set point Table 15 CBX32MV with ComfortSenset 7000 Thermostat and Two Stage Outdoor Unit Operating Sequence Operating Sequence System Demand System Response System Condition Step Thermostat Demand Relative Humidity Compre ssor Air Handler CFM COOL Comments Y1 Y2 O G W1 W2 Status D No Ca...

Page 50: ... 7000 ther mostat energizes Y2 and de energizes D on a call for dehumidification NOTE No over cooling Dehumidification Call 2 On On On On Demand 0 VAC High 70 PRECISION MODE Operates independent of a Y1 thermostat demand Normal Operation 1 On On On On Acceptable 24 VAC High 100 Dehumidification mode be gins when humidity is greater than set point Dehumidification call 2 On On On On Demand 0 VAC Hi...

Page 51: ...0V Single Phase 1 W1 of the thermostat provides a W1 demand to the Control The Control outputs a 22VDC signal to the K32 relay K32 1 closes 2 Assuming the N C primary S15 and secondary S20 limit switches are closed electric heat element HE1 is energized 1 2 ...

Page 52: ...gle Phase 1 W1 of the thermostat provides a W1 demand to the Control The Control outputs a 22VDC signal to the K32 relay K32 1 closes 2 Assuming the N C primary S15 and secondary S20 limit switches are closed electric heat element HE1 is energized 1 2 1 ...

Page 53: ...dary S20 limit switches are closed electric heat element HE1 is energized SECOND STAGE HEAT remove jumper between W2 and R 1 When K32 1 closes the unit is ready for a second stage heat demand W2 of the thermostat provides a W2 demand to the Control The Control outputs a 22VDC signal to the K33 relay 2 When K33 1 closes assuming the N C primary S15 and secondary S20 limit switches are closed electr...

Page 54: ...20 limit switches are closed electric heat element HE1 is energized SECOND STAGE HEAT remove jumper between W2 and R 1 When K32 1 closes the unit is ready for a second stage heat demand W2 of the thermostat provides a W2 demand to the Control The Control outputs a 22VDC signal to the K33 relay 2 When K33 1 closes assuming the N C primary S15 and secondary S20 limit switches are closed electric hea...

Page 55: ...itches are closed electric heat element HE1 is energized SECOND STAGE HEAT remove jumper between W2 and R 1 When K32 1 closes the unit is ready for a second stage heat demand W2 of the thermostat provides a W2 demand to the Control The Control outputs a 22VDC signal to the K33 and K34 relays 2 When K33 1 and K34 1 close assuming the N C primary S15 and secondary S20 limit switches are closed elect...

Page 56: ...are closed electric heat elements HE1 and HE3 are energized SECOND STAGE HEAT remove jumper between W2 and R 1 When K32 1 and K33 1 closes the unit is ready for a second stage heat demand W2 of the thermostat provides a W2 demand to the Control The Control outputs a 22VDC signal to the K34 and K35 relays 2 When K34 1 and K35 1 closes assuming the N C primary S15 and secondary S20 limit switches ar...

Page 57: ...des a W2 demand to the Control The Control outputs a 22VDC signal to the K33 and K35 relays When K33 1 and K35 1 closes and assuming the N C primary S15 and secondary S20 limit switches are closed electric heat elements HE3 and HE4 are energized THIRD STAGE HEAT remove jumper between W3 and R if using third stage 1 When K35 closes the unit is ready for a third stage heat demand W3 of the thermosta...

Page 58: ...t switches are closed electric heat element HE1 is energized SECOND STAGE HEAT remove jumper between W2 and R 1 When K32 1 closes the unit is ready for a second stage heat demand W2 of the thermostat provides a W2 demand to the Control The Control outputs a 22VDC signal to the K33 and K34 relays 2 When K33 1 and K34 1 close assuming the N C primary S15 and secondary S20 limit switches are closed e...

Page 59: ...es are closed electric heat elements HE1 and HE2 are energized SECOND STAGE HEAT remove jumper between W2 and R 1 When K34 closes the unit is ready for a second stage heat demand W2 of the thermostat provides a W2 demand to the Control The Control outputs a 22VDC signal to the K33 and K35 relays When K33 1 and K35 1 closes and assuming the N C primary S15 and secondary S20 limit switches are close...

Page 60: ...IR SENSOR TERMINAL ON AIR HANDLER CONTROL PLENUM CBX32MV AIR HANDLER CONTROL PART NO 50W28 DISCHARGE SENSOR DAT TEMP RESISTANCE 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 HAS TWO SCREW TERMINALS MARKED DISCHARGE...

Page 61: ...h the coils The coil is designed to easily slide out of the unit cabinet D AIR HANDLER CONTROL AHC The Air Handler Control manages electric heat indoor blower and accessory controls The Air Handler Control also provides system configuration and air flow adjustments plus diagnostic capabilities F DISCHARGE SENSOR DAT The Air Handler Control has two screw terminals marked Discharge Air Sensor The se...

Page 62: ...connect contacts may become welded Try not to bounce the disconnect switch when applying power to the unit Motor Start Up When B3 begins start up the motor gently vibrates back and forth for a moment This is normal During this time the electronic controller is determining the exact position of the rotor Once the motor begins turning the controller slowly eases the motor up to speed this is called ...

Page 63: ...Connector J48 5 Pin J49 4 Pin P49 4 PIN P48 5 PIN Figure 30 Regal Beloit Blower B3 Harness Connectors P48 5 Pin P49 4 Pin J48 Connector installed on motor P49 4 Pin 120v 0 230v 5 4 3 2 1 J48 Connector 24v Transformer J49 Connector P49 4 PIN P48 5 PIN Figure 31 Regal Beloit Gemtech 3 0 Troubleshooting ...

Page 64: ...ot an auto ranging type please set it to the highest ohm scale 100 K ohms or greater Scale Measurement range in words ohms 2 M two megohm two million ohms 0 2 000 000 200 K two hundred kilo ohm two hundred thousand ohms 0 200 000 20 K twenty kilo ohm twenty thousand ohms 0 20 000 2 K two kilo ohm two thousand ohms 0 2 000 200 two hundred ohms 0 200 Figure 32 Typical Digital Multimeter CONTROL MODU...

Page 65: ...ctor P48 5 Pin P49 4 Pin P48 5 PIN P49 4 PIN CONTROL MODULE MOTOR Figure 35 Indoor Blower Motor B3 Control Connections Emerson P49 4 Pin P48 5 PIN HARNESS P49 4 PIN HARNESS CONTROL MODULE MOTOR 120v 0 230v 5 4 3 2 1 J48 Connector P48 5 PIN HARNESS Figure 36 J48 Test Emerson ...

Page 66: ...r coil control circuit The relays energize different stages of heat as well as the blower The blower is always first on and last off 3 Terminal Strip TB2 For the electric heat sections without circuit breakers or fuses line voltage connections are made to terminal strip TB2 The terminal strip is located in the lower left corner of the electric heat vestibule panel Single phase electric heat uses t...

Page 67: ...Page 67 CBX32MV ECB40 9CB P VOLTAGE SHOWN Primary Limit S15 and Secondary Limit S20 Relay K32 Relay K33 Elements HE1 and HE2 Location of CB1 Figure 38 Electric Heat ...

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