Daikin DM80TN User Manual



RSD6621009
May 2021

 2
 5
 6
 26
 29
 
 41
 43
Pride and workmanship go into every product to provide
our customers with quality products. It is possible, however,
that during its lifetime a product may require service.
Products should be serviced only by a qualied service
technician who is familiar with the safety procedures
required in the repair and who is equipped with the proper
tools, parts, testing instruments and the appropriate service
manual. 







-
-










Copyright © 2021

Daikin DM80TN Specifications

General

Brand	Daikin
Model	DM80TN
Category	Furnace
Language	English

Summary

Important Information

Safety Warnings and Precautions

General safety warnings and precautions for operation and servicing.

Operating Instructions

Step-by-step guide for operating the furnace.

Turning Off Gas Supply

Procedure for safely shutting off the gas supply to the furnace.

Product Identification

Model Nomenclature

Details of the 14-digit model and manufacturing number breakdown.

System Operation

Electrical Connections and Wiring

Wiring, grounding, and connecting accessories like humidifiers.

Heating Thermostat Control

How thermostats control heating modes and staging.

Furnace Twinning and Accessories

Procedures for twinning furnaces and connecting accessories.

Gas Heat Operation Modes

Gas heat sequence, blower speed selection.

Cooling Operation Modes

Sequence of operation for low and high stage cooling modes.

Airflow and Ductwork

Guidelines for ductwork design and airflow for optimal performance.

System Status Codes

Understanding 2-stage status codes and menu options.

Scheduled Maintenance

Heating Performance and Burner Checks

Testing heating system performance and burner visual checks.

Gas Meter Clocking Procedure

Steps to measure gas input by timing the meter's dial rotation.

Servicing

Electrical System Checks

Verifying voltage, transformer phasing, and wiring integrity.

Control System Checks

Servicing thermostats, limit controls, and safety switches.

Airflow and Blower System

Checking blower motors, duct static, and temperature rise.

Gas and Combustion System

Inspecting gas valves, burners, orifices, pressure, and ignition.

Ignition and Safety Device Checks

Checking pressure switches, rollout controls, ignitors, and flame sensors.

Troubleshooting

Troubleshooting Chart and Fault Codes

Identifying symptoms, LED status, faults, and corrective actions.

Wiring Diagrams

Control Board Wiring Diagram

Detailed wiring diagram for the integrated control module.