Lennox Harmony III User Manual

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1.10.9.1. Gas Furnace and Air Conditioning ...................................................... 13
1.10.9.2. Heat Pump with Electric Backup Heat ................................................ 13
1.10.9.3. Heat Pump - Dual Fuel heating, 1-stage or 2 Stage Heat Pump and
Gas Furnace ....................................................................................... 13
1.11. Common System Component Wiring ...............................................................13
1.11.1. Dampers and Damper Transformer .................................................................... 13
1.11.2. Discharge Air Sensor (DAS) Probe ..................................................................... 14
1.12.ComponentSpecicWiring ..............................................................................14
1.12.1. Zone Control Transformer Phasing ..................................................................... 14
1.12.2. Thermostat .......................................................................................................... 15
1.12.3. Gas Furnace ....................................................................................................... 15
1.12.4. Air Conditioner Unit ............................................................................................. 15
1.13. Minimum CFM in Variable Speed Furnace and Air Handlers ...........................16
1.14. System Flow Diagrams ....................................................................................17
2. Heat Pump ............................................................................. 18
2.1. Installing Heat Pump and Accessories ............................................................... 18
2.1.1. Equipment Installation ......................................................................................... 18
2.1.2. Pressure Switch .................................................................................................. 18
2.1.3. Pressure Switch Wiring ...................................................................................... 18
2.1.4. Tee (High Pressure Switch; Heat Pumps only) ................................................... 18
2.1.5. Balance Point Sensor (Outdoor Thermostat) ...................................................... 18
2.1.6. Defrost Tempering Kit .......................................................................................... 19
2.2. Variable Speed Motor (VSM) Air Handler and Heat Pump - Option 2
(Zoning System) ................................................................................................. 20
2.3. Heat Pump System Start-Up and Checkout.......................................................21
2.3.1. Powering the System (All Systems) .................................................................... 21
2.3.2. Checkouts ........................................................................................................... 21
2.3.2.1. Typical Heat Pump Heating Checkout (Single Zone) .......................... 21
2.3.2.2. Typical Heat Pump Heating Checkout (Multiple Zone) ....................... 22
2.3.2.3. Typical Heat Pump Heating Checkout (Central Mode) ....................... 23
2.4. Heat Pump System Start-Up and Checkout.......................................................24
2.4.1. Troubleshooting Diagram .................................................................................... 24
2.4.2. Heat Pump Heating Operation ............................................................................ 25
2.4.3. Defrost Operations .............................................................................................. 25
3. Gas Furnace .......................................................................... 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 Operations ........................................... 27
Table of Contents
1. General ..................................................................................... 4
1.1. Shipping and Packing List .................................................................................... 4
1.2. Acronyms Used .................................................................................................... 4
1.3. Additional Parts Required ....................................................................................4
1.4. Introduction ..........................................................................................................4
1.5. Residential Zone Control System - Overview of Field Wiring ..............................5
1.6. System Components ............................................................................................ 5
1.6.1. Zone Control System ............................................................................................ 5
1.6.2. Discharge Air Sensor (DAS) .................................................................................. 6
1.6.3. Thermostats .......................................................................................................... 6
1.6.4. Transformers ......................................................................................................... 6
1.6.5. Dampers ................................................................................................................ 6
1.6.6. Remote Vacation Switch ....................................................................................... 6
1.7. Installation Planning and Selecting Heating and Cooling Equipment ..................7
1.7.1. Installation Considerations ................................................................................... 7
1.7.2. Variable Speed Blower Motor (VSM) .................................................................... 7
1.7.3. Selecting/Installing Indoor and Outdoor Units ...................................................... 7
1.8.OptionalDehumidicationAccessories ................................................................7
1.9. Installing Zone Control Components .................................................................... 7
1.9.1. Discharge Air Sensor (DAS) .................................................................................. 7
1.9.2. Zone Control Panel ............................................................................................... 8
1.9.3. Thermostats .......................................................................................................... 8
1.9.4. Transformer ........................................................................................................... 8
1.9.5. Dampers ................................................................................................................ 8
1.9.6. Zone Linking .......................................................................................................... 8
1.10. Zone Control Panel Jumpers..............................................................................9
1.10.1. Setup for Controlling Equipment Staging and Volume of Air to Zones ................. 9
1.10.2. PIAB Jumpers Affect Blower Operation ................................................................ 9
1.10.3. Upgrading from Harmony II zoning system? ....................................................... 10
1.10.4. Zone 1 PIAB Jumpers – 140ºF DAS ................................................................... 10
1.10.5. Determining PIAB Jumper Settings ..................................................................... 10
1.10.6. Continuous Air Reduction Jumpers ...................................................................... 11
1.10.7. Heating Air Reduction Jumpers ............................................................................11
1.10.8. Heat/Cool Staging ................................................................................................11
1.10.8.1. Heating Staging Temperature Jumper .................................................11
1.10.8.2. Cooling Staging Temperature Jumper ................................................ 12
1.10.9.SystemConguration/E-HeatStages) ................................................................ 13

Lennox Harmony III Specifications

General

Brand	Lennox
Model	Harmony III
Category	Control Systems
Language	English