Lennox Harmony III Installation, Setup And User Manual Download Page 8

8

1. 

When possible, position the sensor some distance away from the coil rather 

than in the immediate coil area. The discharge air sensor should be located at 

least 10 inches above the coil if possible.

2. 

Fasten the sensor bracket to the plenum with two self-tapping sheet metal 

screws.

3. 

Connect wires to DAS on zone control panel. Not on the air handler control 

or IFC (see “Figure 20. Option 2 - Typical Lennox Heat Pump and Lennox 

Variable-Speed Air Handler (Troubleshooting)” on page 20 ).

4. 

Be sure that the tip of the sensor is located approximately 10 inches from the 

indoor coil in the discharge plenum, and half the depth of the plenum, and 

center over the discharge airflow, side-to-side.

IMPORTANT

For the DAS, transversing the supply duct for the best location is recommended.
Optimal location is critical to the proper operation of the zoning system

plenum

coil

INDOOR 

UNIT FRONT 

VIEW

sensor centered in

discharge airflow

(see note 1)

Temperature

19

(254)

INDOOR UNIT

SIDE VIEW

ECB

Electric

Heat

Strips

NOTE - FOR UNITS WITH HUMIDITROL— Discharge air sensor

(DAS) MUST be located on the output side of the EDA (if used; see

Humiditrol Zoning Accessory Installation 506064-02)

SENSOR PROBE

see PROBE

MOUNTING

note below

PLENUM

SENSOR 

MOUNTING 

DETAIL

Fully insert into plenum

Figure 4.  Discharge Air Sensor Installation

1.9.2.  Zone Control Panel

IMPORTANT

The electrical power source for the zone control system, i.e. the transformer 

primary, and furnace or air handler unit must be the same source. In addition, the 

zone control system power-up must occur at the same time or before the furnace 

or air handler unit is powered up.

Select an installation site for the Harmony III zoning system control considering the 

following location parameters:
•  Is conveniently accessible and centrally located to facilitate wiring from 

thermostats, dampers, pressure switch (if used), and HVAC equipment. 

•  Is in a non-condensing area (such as a closet).
•  Is NOT in a laundry room (nor other room in the house where the humidity would 

typically be much higher than the rest of the house).

• 

Is NOT in any part of the building where the temperature may exceed 150°F.

1.9.3.  Thermostats

Identify the best location for a thermostat in each zone. If two or more rooms are 

within a single zone, place the thermostat in a location that is central to all rooms. 

For example, if a zone contains two bedrooms, try to place the thermostat in a 

hallway near both bedrooms.
Do not install thermostats in drafty areas, behind doors, in corners, near radiant heat 

sources (appliances), near sunny windows, near concealed pipes and chimneys, 

nor in unconditioned spaces such as closets or exterior walls.

1.9.4.  Transformer

Obtain an appropriately-rated transformer (see “Table 5. 24VAC Transformer 

Selection Chart” on page 6). Install the transformer in either the indoor unit or 

in an electrical junction box near the zone control panel. 

NOTE: 

Two transformer systems need to be in phase with each other.

1.9.5.  Dampers

NOTE: 

The power source for the transformer must be the same power source as 

the indoor unit’s transformer.

Motorized dampers in the supply duct system regulate air to the zones. Some 

applications will be unique and require more than one damper per zone. If 

additional dampers are required, refer to the wiring diagram in “1.12. Component 

Specific  Wiring”  on  page  14. Also,  if  more  than  six  dampers  are  used,  another 

transformer and isolation relay will be necessary.
For more effective zone isolation, the return duct system may also be dampered 

by zone. Dampers for each zone must be wired in parallel. Install dampers in the 

desired locations; then run thermostat wire from the damper to the zone control 

panel and damper relays as needed.

1.9.6.  Zone Linking

Zone link a small zone to a large zone by wiring dampers in a manner similar to 

figure 4. Effectively, this distributes some of the small zone’s air to another zone to 

reduce the chance of overheating or overcooling the smaller zone. Refer to “Table 

8. Lennox AC or Heat Pump Units” on page 7 which shows an example of an 

unequal zone and how to adjust to bring it within 25% of the average CFM. Figure 

Summary of Contents for Harmony III

Page 1: ...HARMONY III zoning system X9953 Installation Setup and User Guide 507936 01 6 2021 Supersedes 7 2019 2021 Lennox Industries Inc Dallas Texas USA...

Page 2: ...urnace 26 3 1 Typical Wiring for Variable Speed Gas Furnace and Outdoor AC Unit Option 1 26 3 2 Furnace Variable Speed Motor Electrical Adjustments 27 3 3 Variable Speed Motor Furnace System Operation...

Page 3: ...3 3 Cooling Only or Cooling with Hot Water Coil Non Heat Pump 46 5 Dual Fuel Option 3 48 5 1 Zone Control System Wiring Option 3 48 5 2 Dual Fuel System Start Up Defrost Temperating Sensor Placement a...

Page 4: ...E Due to Lennox ongoing commitment to quality features and options are subject to change without notice and without incurring liability Improper installation adjustment alteration service or maintenan...

Page 5: ...4 if LSOM equipped unit wire low voltage two stage condensing unit 18 ga minimum Up to seven wire low voltage single stage heat pump outdoor unit 18 ga minimum Up to eight wire low voltage two stage h...

Page 6: ...anel zone thermostats and Humiditrol Zoning Accessory if EDA is used are powered by a single field provided 24VAC transformer Together the zone control panel and thermostats require 10VA dampers requi...

Page 7: ...r unequal size Table 7 Indoor Outdoor Options Options Indoor Unit Outdoor Unit 1 Any Lennox Gas Furnace with VSM only Lennox Air Conditioner unit as described in Table 8 Lennox AC or Heat Pump Units 2...

Page 8: ...other room in the house where the humidity would typically be much higher than the rest of the house Is NOT in any part of the building where the temperature may exceed 150 F 1 9 3 Thermostats Identif...

Page 9: ...STAGING JUMPERS CONTINUOUS AIR REDUCTION JUMPERS HEATING AIR REDUCTION JUMPERS PIAB JUMPERS SYS CONFIG AND E HEAT JUMPERS Figure 6 Zone Control Panel Jumper Banks CAUTION Static electrical discharge...

Page 10: ...place across both pins the discharge air sensor DAS upper limit will be 140 F instead of 160 F default to provide added operational flexibility HEATING STAGING JUMPERS COOLING STAGING JUMPERS CONTINUO...

Page 11: ...areas where units have high cooling capacity with low heat capacity ALWAYS set the jumper on 0 The heating air reduction jumper enables the blower speed during heating only to run at a reduced rate co...

Page 12: ...40 F NOTE Note the 140F DAS jumper s impact on the differential at 120 and 130 settings 1ST STAGE 2ND STAGE 2ND STAGE Discharge Air Temperature F 1 10 8 2 Cooling Staging Temperature Jumper Cooling St...

Page 13: ...ol unit signals for continuous blower operation to those zones from which a thermostat heat demand is received Select the number of equipment cooling stages by placing the COOL stages jumper to the ap...

Page 14: ...temperature probe is not polarity sensitive 1 12 Component Specific Wiring CHECK VOLTAGE BEFORE CONNECTING ZONE CONTROL TRANSFORMER ZONE CTRL XFMR LEADS TO THE ZONE CONTROL PANEL CONNECTIONS VERSED SW...

Page 15: ...l 24VAC C terminal and R wire to R terminal 1 12 2 Thermostat Using standard electronic 1 heat 1 cool non heat pump non power robbing thermostats and five wire thermostat cable wire units as follows 1...

Page 16: ...V60C 450 SL280UH080NV60C SL280UH100NV60C 450 SL280UH070V36A SL280UH090V36B 250 SL280UH090V48B 380 SL280UH090V60C SL280UH110V60C 450 Table 12 Minimum indoor variable speed blower CFM per model number A...

Page 17: ...Operations AC HP Shutdown all pressor electric heat Continuous air delivered to calling zones Discharge air below heating staging jumper setting 4 minute minimum stage runtime completed 5 minutes sinc...

Page 18: ...stage down and turn off if the switch does not close within 90 seconds Afterwards backup heat will be used to satisfy the demand 5 Remove the restriction When hot gas pressure drops below the close o...

Page 19: ...at 90 F during a defrost cycle This tempers the discharge air and protects the compressor from high refrigeration pressures during defrost The following figure show the defrost temperating kit compon...

Page 20: ...HFC 410A W C Y G R W C Y G R IMPORTANT VARIABLE SPEED AIR HANDLER HEAT PUMP System Configuration E Heat jumper settings CONNECT TO THE SAME POWER SUPPLY AS THE AIR HANDLER ZONE CONTROL TRANSFORMER Con...

Page 21: ...t zone 1 thermostat for a heat demand check Zone 1 thermostat W LED on heating demand Damper LED 1 off damper open Damper LEDs 2 3 and 4 on dampers closed Output Heat Y1 LED on compressor on Heating L...

Page 22: ...r settings for all zones It may take the blower 60 to 90 seconds to reach this speed 2 If Single Stage Heat Pump skip to step 3 The discharge air sensor continually samples air temperature If after fo...

Page 23: ...ompressor At approximately the same time the indoor blower starts operating at a speed according to the PIAB jumper settings for all zones It may take the blower 60 to 90 seconds to reach this speed 2...

Page 24: ...g Heating Defrost Emer Heating mand changes If no does DS output vary from 0 to 25VDC Line Voltage to transformer 24VAC from transformer to zone control panel Are all wire connections good Are all wir...

Page 25: ...in delay complete No Continuous air delivered to calling zones ORDER OF STAGING HP stg 1 Y1 HP stg 2 Y2 Elec strip stg 1 W1 Elec strip stg 2 W2 ture at which the heat pump electric heat is allowed to...

Page 26: ...o integrated control C terminal Thermostat 2 Thermostat 1 W C Y G R W C Y G R Variable Speed Furnace 2 Stage Condensing Unit shown No Y2 wire on 1 Stage Unit NOTE Do not wire Y wire s from the furnace...

Page 27: ...ny III zoning system with Variable Speed Blower Motors Gas Furnaces on page 16 A 3 duty cycle corresponds to the minimum CFM and a 97 duty cycle corresponds to the maximum CFM NOTE Any on off delays p...

Page 28: ...zoning system control board W2 connection from Harmony III zoning system to SLP98 is optional see Harmony III zoning system furnace installation instructions for details DIP switch settings ON or OFF...

Page 29: ...er C No connection to Y1 or Y2 on indoor unit Outdoor Unit Wiring Completed Thermostat and damper wiring completed Discharge Sensor wired to Harmony III zoning system 3 3 3 2 SL280V SL280NV EL296V and...

Page 30: ...3 and 4 each have their own thermostat Thermostats may be standard or auto changeover type Heat and cool demands present at the same time from different zones opposing demands are satisfied on a firs...

Page 31: ...ntrol checks the discharge air sensor for proper temperature If measured temperature is 7 F or more above the cooling staging jumper setting then Y2 energizes if available If both stages of cooling ar...

Page 32: ...to match condenser 1 or 2 stage 9 Stages Circle one 2HP 1HP Ignored for gas heat non heat pump application 9 E HEAT Stages Circle one DF 1 2 3 Ignored for gas heat non heat pump application 9 Desired...

Page 33: ...t demand check Zone 1 thermostat W LED on heating demand Damper LED 1 off damper open Damper LEDs 2 3 and 4 on dampers closed Output Heat W1 LED on furnace on Heating LED on The furnace begins ignitio...

Page 34: ...ed by the discharge air sensor the fan LED comes on and the blower will slowly increase to speed required by the zones calling The blower operates at a speed equivalent to the sum of all zone PIAB jum...

Page 35: ...control system will start the furnace blower on low speed 0 PIAB air 45 seconds after the combustion cycle has begun 3 When 100 F warm air is sensed by the discharge air sensor the fan LED will light...

Page 36: ...in response to demand ergize appropriate outputs ing er to R puts Does blower speed change as zone demand changes If no does DS output vary from 0 to 25VDC Line Voltage to transformer 24VAC from trans...

Page 37: ...all wire connections good Are all wire connections correct No pressure Switch should be installed DAMPERS 120 VAC 24 VAC Thermostat 2 Thermostat 1 W C Y G R DISCHARGE AIR SENSOR THERMOSTATS Y1 Y2 C R...

Page 38: ...l heat stages Is discharge air at upper limit Does discharge air temp meet heating staging differential Is discharge air at upper limit Heating demand satisfied Heating demand satisfied Heating demand...

Page 39: ...rs GAS 1COOL or 2COOL Others do not matter As applicable cut jumpers and harness wires HEATING ONLY NOTE JUMPER between RC and RH must be in place on the control Y1 Y2 C R R G W1 W2 C DS Y1 Y2 Y1 Y2 O...

Page 40: ...Air Handler Control CBX32MV revision 06 and CBX40UHV 4 2 2 Non Communicating Indoor Control These air handler blower motors are controlled by the BDC3 drive control CFM adjustment Is by jumper setting...

Page 41: ...oved and connected to the G pigtail Tape off end of wiring going to the circuit board jack plug If this wire is not removed the DS signal from the Harmony III zoning system control will not be able to...

Page 42: ...AB Jumpers 140 F DAS on page 10 9 Cooling staging jumper Circle one 50 55 60 Select desired discharge air temp during cooling 9 Cont Air Reduction jumper Circle one 0 25 50 75 Percentage airflow reduc...

Page 43: ...blower ramping Ignored by Harmony III zoning system Panel Setup 9 Heating staging jumper Circle one 85 90 100 110 120 130 Recommended 120 deg F 9 Zone 1 PIAB 140F DAS jumper in place Circle one Yes No...

Page 44: ...e 10 9 Cooling staging jumper Circle one 50 55 60 Select desired discharge air temp during cooling 9 Cont Air Reduction jumper Circle one 0 25 50 75 Percentage airflow reduction for continuous fan ope...

Page 45: ...g blower ramping Ignored by Harmony III zoning system Panel Setup 9 Heating staging jumper Circle one 85 90 100 110 120 130 Recommended 120 deg F 9 Zone 1 PIAB 140F DAS jumper in place Circle one Yes...

Page 46: ...jumper Circle one 0 25 50 75 Percentage airflow reduction for continuous fan operation 9 Heating Air Reduction jumper Circle one 0 20 40 Percentage air flow reduction for heating mode 9 System Configu...

Page 47: ...Circle one Yes No See 1 10 4 Zone 1 PIAB Jumpers 140 F DAS on page 10 9 Cooling staging jumper Circle one 50 55 60 Select desired discharge air temp during cooling 9 Cont Air Reduction jumper Circle...

Page 48: ...be conditioned at the same time Emergency Heat OFF to allow Heat Pump to provide heat Emergency Heat ON to force vide all heating disallows heat pump from providing any heat R C Y1 Y2 O W1 R G W1 W2 C...

Page 49: ...c LEDs will light and extinguish 3 Finally the status light will begin to flash indicating proper operation Perform the gas heating checks using the information in the following sections 5 2 2 Defrost...

Page 50: ...ace begins ignition sequence after zone 1 has demanded heat The zone control system will start the furnace blower on low speed 0 PIAB 45 seconds after the combustion cycle has begun 2 When 100 F warm...

Page 51: ...a heat demand is detected The zone control system will start the furnace blower on low speed 0 PIAB 45 seconds after the combustion cycle has begun 2 When 100 F warm air is sensed by the discharge air...

Page 52: ...ff damper open 2 The furnace will begin its ignition sequence after Zone 1 has demanded heat The zone control system will start the furnace blower on low speed 0 PIAB air 45 seconds after the combusti...

Page 53: ...VDC Line Voltage to transformer 24VAC from transformer to zone control panel Are all wire connections good Are all wire connections correct Pressure Switch installed in correct position Does switch op...

Page 54: ...ce Hold dampers open for 3 minutes Discharge air DAS above 100 F No Yes Yes No Is discharge air at upper limit De energize W1 W2 furnace Is discharge air at upper limit Does discharge air temp meet he...

Page 55: ...ing zones Yes No No Heat pump locked out see NOTE Yes No Monitor discharge air temperature 5 min delay complete Yes No System in 3 hr backup heat mode Yes No Discharge air DAS above 135 F 3 minute min...

Page 56: ...ignored by Harmony III zoning system 10 OFF 11 OFF DIP switches 11 and 12 determines heating blower speed and is ignored by Harmony III zoning system 12 ON Panel Setup Heating staging jumper Circle o...

Page 57: ...s low fire minimum capacity firing rate default setting shown and is recommended starting point 15 OFF 16 OFF 17 OFF DIP switches 17 18 and 19 sets high fire 100 capacity firing rate default setting s...

Page 58: ...ed set DIP switches 11 12 and 13 to OFF Factory Default 12 OFF 13 OFF 14 OFF DIP Switches 14 and 15 Continuous blower speed set DIP switches 14 and 15 to OFF 38 of High Cool Speed Factory Default 15 O...

Page 59: ...trol panel and near connection terminals These red LEDs indicate the output status of dampers furnace outdoor unit etc When an output is powered or active the corresponding LED is illuminated 4 Pressu...

Page 60: ...e sure steady state is reached before staging Compressor Off Time 5 min At end of demand Equalizes pressure in refrigerant system and prevents short cycling Heat Staging electric 2 min Between staging...

Page 61: ...nal on the zone control panel While not a precise measurement the voltmeter fluctuation indicates that the blower speed is changing 1 Connect electronic voltmeter between DS and any C terminal on the...

Page 62: ...hermostat is making intermittent contact and needs attention The offending thermostat will be ignored for four minutes after the zone control system detects the problem After four minutes if the signa...

Page 63: ...actual CFM delivered to each zone will be determined by the zone control system settings blower motor control board settings zone thermostat demand status calling for heating cooling continuous fan or...

Page 64: ...ses 100 Heating PIAB Formula Total PIAB x 1 Heating air reduction setting 2 Then find Heating PIAB Total PIAB from step 1 1 00 1 Heating air reduction setting 1 00 20 x 80Total Heating PIAB 80 Total H...

Page 65: ...Zone 1 CFM Required Minimum Maximum Minimum ZONE 1 PIAB x 100 0 0 1 x B A I P 1 E N O Z 0 0 1 x B A I P 1 E N O Z Zone 2 CFM Required Minimum Maximum Minimum ZONE 2 PIAB x 100 0 0 1 x B A I P 2 E N O...

Page 66: ...9 CFM 55 F TR Output BTU 35 000 589 CFM 55 F TR Output BTU 35 000 Example CFM For Harmony III 565 CFM 40 F TR Output BTU 24 430 559 CFM 40 F TR Output BTU 24 000 810 CFM 40 F TR Output BTU 35 000 810...

Page 67: ...Output BTU 41 000 848 CFM 60 F TR Output BTU 55 000 848 CFM 60 F TR Output BTU 55 000 Factory CFM 740 CFM 35 F TR Output BTU 28 000 850 CFM 45 F TR Output BTU 41 000 965 CFM 53 F TR Output BTU 55 000...

Page 68: ...del Low Nox SL280UH070XV36A SL280UH090XV48B SL280UH090XV60C Minimum CFM 589 CFM 55 F TR Output BTU 35 000 791 CFM 55 F TR Output BTU 47 000 791 CFM 55 F TR Output BTU 47 000 791 CFM 55 F TR Output BTU...

Page 69: ...55 F TR Output BTU 46 000 993 CFM 55 F TR Output BTU 59 000 Factory CFM 860 CFM 38 F TR Output BTU 35 000 1 075 CFM 40 F TR Output BTU 46 000 1 245 CFM 34 F TR Output BTU 46 000 1 325 CFM 41 F TR Out...

Page 70: ...ut BTU 44 800 688 80 F TR Output BTU 59 500 787 CFM 70 F TR Output BTU 59 500 805 CFM 70 F TR Output BTU 60 900 Maximum CFM 1 185 CFM 50 F TR Output BTU 64 000 1 312 CFM 60 F TR Output BTU 85 000 1 57...

Page 71: ...ail at CFM Zoning 553 CFM 75 F TR Output BTU 44 800 726 CFM 75 F TR Output BTU 58 800 787 CFM 70 F TR Output BTU 59 500 787 CFM 70 F TR Output BTU 59 500 Maximum CFM 1 185 CFM 50 F TR Output BTU 64 00...

Page 72: ...mum CFM 180 CFM Per Ton 270 CFM 360 CFM 450 CFM 540 CFM Recommend CFM 300 CFM Per Ton For Zoning 450 CFM 600 CFM 750 CFM 900 CFM CFM 400CFM Per Ton 600 CFM 800 CFM 1 000 CFM 1200 CFM Size 3 5 Tons 4To...

Page 73: ...n 1 330 CFM 1 520 CFM 1 900 CFM Recommend CFM 450 CFM Per Ton 1 575 CFM 1 800 CFM 2 250 CFM Two Stage Condensing Unit In First Stage Cooling Table 31 Two Stage Condensing Unit In First Stage Cooling A...

Page 74: ...206 CFM 1 508 CFM Variable Condensing Unit Minimum Cooling CFM Table 33 Variable Condensing Unit Minimum Cooling CFM At minimum blower CFM superheat must be at or above 5 SH Model EL18XCV 024 EL18XCV...

Page 75: ...Per Ton For Zoning 333 CFM 327 CFM 608 CFM 677 CFM Recommend CFM 450 CFM Per Ton 394 CFM 387 CFM 720 CFM 801 CFM Electric Heating ECBA25 P CBA25UHV Table 35 Electric Heating ECBA25 P CBA25UHV 240VAC 3...

Page 76: ...att Size by kW No Of Stages Low Heating BTU Air ow to 30 Tr Max Heating BTU 4kW 1 13 652 421 CFM 13 652 5kW 1 17 065 527 CFM 17 065 6kW 1 20 478 632 CFM 20 478 8kW 2 13 652 421 CFM 27 304 9kW 2 15 358...

Page 77: ...ON all zones receive conditioned air at the same time like traditional non zoned HVAC systems The master thermostat located in Zone 1 controls any heating or cooling need for all zones in the buildin...

Page 78: ...used at night should not zoned with a living room that is used only during the day or evening 8 8 How do I use the Optional Humiditrol Dehumidification Accessory If your zoned system is equipped with...

Page 79: ...Zone Information Record Table 37 Homeowners Zone Information Record Zone Number Record which rooms are zoned together and controlled by thermostat number 1 2 3 4 Lennox Dealer Contact Telephone Number...

Page 80: ...80...

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