Daikin Packaged Gas / Electric Unit DFG0723DH

CAUTION! Prior to servicing MCHE, be sure to disconnect the power supply and use lock-out methods to prevent the power from accidentally being turned on

During periods when the MCHE is not operated for longer than a week, the MCHE must be completely cleaned following the cleaning procedure. This practice must also be performed during short shut-down periods where corrosive deposits accumulate on the MCHE

Relative to tube & fin heat exchangers, MicroChannel heat exchanger coils tend to accumulate more dirt on the surface of the coil and less dirt inside the coil, making them easier to clean

Remove surface dirt, leaves, fibers, etc. with a vacuum cleaner (preferably with a brush or other soft attachment rather than a metal tube), compressed air blown from the inside out, and/or a soft bristle (not wire!) brush. Do not impact or scrape the coil with the vacuum tube, air nozzle, etc

STEP 2: Rinse the coil by following procedure

1. Rinse the coil by approved MCHE cleaner first, or rinsing by water directly

WARNING! ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD

Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage

Improper servicing could result in dangerous operation, serious injury, death or property damage

Before servicing, disconnect all electrical power to furnace

When servicing controls, label all wires prior to disconnecting. Reconnect wires correctly

Verify proper operation after servicing

WARNING! HIGH VOLTAGE! DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH

WARNING! TO PREVENT PERSONAL INJURY OR DEATH DUE TO IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE OR MAINTENANCE, REFER TO THIS MANUAL. FOR ADDITIONAL ASSISTANCE OR INFORMATION, CONSULT A QUALIFIED INSTALLER, SERVICE AGENCY OR THE GAS SUPPLIER

CAUTION! SHEET METAL PARTS, SCREWS, CLIPS AND SIMILAR ITEMS INHERENTLY HAVE SHARP EDGES, AND IT IS NECESSARY THAT THE INSTALLER AND SERVICE PERSONNEL EXERCISE CAUTION

Warning: This procedure should be performed by trained personnel only!

Is the flame sensor visibly dirty?

If the flame sensor is dirty, proceed with the cleaning. If not, report the condition to the maintenance team.

Upload a photo of the flame sensor before cleaning

Enter the microamp signal after cleaning

Sign off on the flame sensor cleaning

At least once a year, prior to or during the heating season, make a visual check of the burner flames.

NOTE! This will involve removing and reinstalling the heat exchanger door on the unit, which is held by two screws. If you are uncertain about your ability to do this, contact a qualified servicer.

If a strong wind is blowing, it may alter the airflow pattern within the unit enough that an inspection of the burner flames is not possible.

Visual check of the burner flames

Upload a photo of the burner flames

Sign off on the burner flame check

CAUTION! TO PREVENT PROPERTY DAMAGE DUE TO FIRE AND LOSS OF EQUIPMENT EFFICIENCY OR EQUIPMENT DAMAGE DUE TO DUST AND LINT BUILD UP ON INTERNAL PARTS, NEVER OPERATE UNIT WITHOUT AN AIR FILTER INSTALLED IN THE RETURN AIR SYSTEM

Dirty filters are the most common cause of inadequate heating or cooling performance

Is the air filter installed in the return air system?

Filter inspection should be made at least every two months; more often if necessary because of local conditions and usage

Sign off on the filter inspection