Lennox International Inc LZP-2 Detecting Damper Problems, Checking Thermostat Voltages

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Troubleshooting (continued)

DETECTING DAMPER PROBLEMS

Symptom

Possible Solution

 

 

 

DAS shorted or open causing the panel to only respond

 

to zone 1 inputs while not closing any dampers.

Damper opens when it should be closed.

 

Damper wired incorrectly. Spring open power close

 

 

dampers should be connected between NO and

 

C terminals.

 

 

 

DAS shorted or open causing the panel to only respond

Damper will not close.

to zone 1 inputs while not closing any dampers.

 

 

Damper motor faulty.

 

 

CHECKING THERMOSTAT VOLTAGES

Using a digital voltmeter (DVM) measure the AC voltage supplied at the R and C terminals of the Thermostat inputs on the control panel for the zone in question. This voltage should be same as the voltage supplied to the control panel 24VAC terminals. Make a call for heat, cooling or fan. Measure the voltage across the terminal that should be energized (i.e. W for heat, Y for cooling, etc.) and the C terminal. This should be the same voltage as there is between the R and C terminals. Measure the voltage across a terminal that should NOT be energized and the C terminal; this voltage should be zero.

DISCHARGE AIR SENSOR CHECKOUT

The discharge air sensor is a temperature dependent resistor; the higher the temperature, the lower the resistance. In order to confirm the sensor is working, both sensor leads must be disconnected from the zone panel board. Using a digital voltmeter (DVM) set to read resistance, touch the leads from the sensor to the probes of the DVM. Take care not to create a parallel resistance path through your body by touching both probes with your fingers or a faulty reading will be obtained. At 77F, the resistance of the sensor will be 10K ohm. If the sensor is cooler than 77F, the resistance will be higher, if it is warmer, the resistance will be lower. After reading the resistance at room temperature, warm the tip of the sensor by holding it in the palm of your hand, and take another resistance reading. This reading should be noticeable lower than the room temperature reading.

Temperature (°F)

Resistance (ohms)

65

13476

70

11884

75

10501

80

9298

85

8249

90

7333

The zone panel is well equipped to monitor the operation of the probe and determine if a failure has occurred.

The probe should be considered an integral (but replaceable) part of the zone panel. The zone panel will indicate if the probe is operating improperly and needs to be replaced.

B2203458

10006259

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Contents Shipping & Packing List Package 1 of 1 contains the followingRequired Components ordered separately TransformersFeatures InstallationApplication Discharge AIR Sensor Location Thermostat Requirements HEAT/COOLBypass Damper Sizing ExampleRound Rectangular Field Wiring Pin Jumper Settings see Figure LEDsSequence of Operation Heating and Cooling Equipment OperationHeating Operation Cooling OperationContinuous FAN Operation Damper OperationTroubleshooting Detecting Hvac System ProblemsSymptom Possible Solution Detecting HEATING, Cooling and FAN Problems Detecting Damper Problems Checking Thermostat VoltagesDischarge AIR Sensor Checkout Resistance ohms
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Zone Control Panel, LZP-2 specifications

Lennox International Inc, a leader in the HVAC industry, has made significant strides in advancing climate control technologies, particularly with their innovative HVAC Zone Control System, designated LZP-2. This system is designed to provide enhanced comfort and energy efficiency in residential and commercial settings by allowing for precise temperature control across different zones within a building.

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In summary, the Lennox LZP-2 HVAC Zone Control System represents a significant leap forward in home and commercial climate management, combining advanced zoning capabilities, smart technology, and user-friendly design to create a superior indoor environment with enhanced energy efficiency.
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