York DF078 Series User Manual

USER’S, MAINTENANCE
and
SERVICE INFORMATION
MANUAL
SINGLE PACKAGE
AIR CONDITIONER
GAS/ELECTRIC
035-19047-002-A-1103
CONTENTS
SAFETY INFORMATION . . . . . . . . . . . . . . . . 2
FOR YOUR SAFETY . . . . . . . . . . . . . . . . . . . . . 2
SYSTEM OPERATION. . . . . . . . . . . . . . . . . . 2
THERMOSTATS . . . . . . . . . . . . . . . . . . . . . . . . . 2
INTERMITTENT IGNITION DEVICE . . . . . . . . . . 2
INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
OPERATING INSTRUCTIONS. . . . . . . . . . . . . . . 3
TO SHUT DOWN THE FURNACE: . . . . . . . . . . . 3
TO LIGHT THE FURNACE: . . . . . . . . . . . . . . . . 3
VENT SAFETY SYSTEM: . . . . . . . . . . . . . . . . . . 3
100% SHUT OFF: . . . . . . . . . . . . . . . . . . . . . . . . 3
EXPLAIN UNIT FUNCTION . . . . . . . . . . . . . 4
GENERAL MAINTENANCE . . . . . . . . . . . . . 4
HEATING SYSTEM INSPECTION . . . . . . . . . . . 4
BURNER CHECK . . . . . . . . . . . . . . . . . . . . . . . 4
CLEANING BURNERS . . . . . . . . . . . . . . . . . . . . 4
CLEANING FLUE PASSAGES AND
HEATING ELEMENTS . . . . . . . . . . . . . . . . . . . . . 4
AIR FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
BLOWER ASSEMBLY . . . . . . . . . . . . . . . . . . . . 5
MOTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CONDENSER COIL . . . . . . . . . . . . . . . . . . . . . . 6
REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
TROUBLESHOOTING . . . . . . . . . . . . . . . . . 6
BEFORE CALLING A SERVICE
TECHNICIAN: . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
REPLACEMENT PARTS . . . . . . . . . . . . . . . 7
The manufacturer recommends that the “User” read all sections of this
manual and keep the manual for future reference.
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly
could result in serious injury, death, or
property damage.
- Do not store or use gasoline or other
flammable vapors and liquids in the vicin-
ity of this or any other appliance.
- WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas sup-
plier’s instructions.
• If you cannot reach your gas supplier, call
the fire department.
- Installation and service must be per
formed by a qualified installer, service
agency or the gas supplier.
®

York DF078 Series Specifications

General

Brand	York
Model	DF078 Series
Category	Air Conditioner
Language	English

Summary

Safety Information

For Your Safety

Essential safety precautions and guidelines for operating the furnace safely, including fire and explosion hazards.

System Operation

Thermostats

Instructions for setting and adjusting the thermostat for optimal heating or cooling, and avoiding rapid changes.

Intermittent Ignition Device

Explanation of the automatic ignition system and safety warnings regarding manual relighting of burners.

Input

Details on heat capacity regulation via burner orifices and gas pressure adjustment by qualified personnel.

Operating Instructions

Procedures for safely shutting down and lighting the furnace, including manual lockout and system reset.

Vent Safety System

Information on the manual reset high temperature sensor and its function during flame rollout events.

100% Shut Off

How the ignition module handles ignition failures and methods to reset the system after a lockout.

Explain Unit Function

General Maintenance

Heating System Inspection

Annual inspection recommendations for burners, heating elements, and flue for proper operation and safety.

Burner Check

Procedure for visually checking the main burner flame to determine if the burners require cleaning.

Cleaning Burners

Instructions for removing and cleaning furnace burners using a wire brush and vacuum.

Cleaning Flue Passages & Heating Elements

Steps for cleaning heat exchanger tubes and flue passages when sooting occurs.

Air Filters

Guidance on inspecting, cleaning, or replacing air filters to maintain proper airflow and unit efficiency.

Blower Assembly

Annual inspection and cleaning of the blower assembly, including motor and wheel dust accumulation.

Motors

Details on outdoor and indoor fan motor lubrication requirements and maintenance intervals.

Condenser Coil

Annual check and cleaning procedures for the outdoor condenser coil to ensure optimal performance.

Registers

Ensuring supply and return air registers remain open and unobstructed during operation.

Troubleshooting

Before Calling a Service Technician

Pre-service checks for thermostat settings, fuses, breakers, and filter condition to resolve common issues.

Replacement Parts