Daikin Air Handler DAT1204

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.

Routine maintenance is essential for trouble free operation of this Airhandler. A few preseason checks can eliminate costly repairs and down time.

A certified service technician must perform all services mentioned below.

Check and change air filters as needed

Check, adjust or replace belts and check sheaves for proper operation.

Clean the evaporator coil and check for duct leaks.

Check for proper charge and (or) for refrigerant leaks.

If these few precautions are observed and maintained, this Airhandler can provide years of trouble free service.

Sign off on the air handler maintenance

FIRE HAZARD!: To avoid the risk of property damage, personal injury or fire, use only copper conductors.

HIGH VOLTAGE!: Disconnect ALL power before servicing. Multiple power sources may be present. Failure to do so may cause property damage, personal injury or death.

HIGH VOLTAGE!: To avoid property damage, personal injury or death due to electrical shock, this unit MUST have an electrical ground. The electrical ground circuit may consist of an appropriately sized electrical wire connecting the ground lug in the unit control box to the building electrical service panel.

Other methods of grounding are permitted if performed in accordance with the National Electric Code (NEC)/American National Standards Institute (ANSI)/National Fire Protection Association (NFPA) 70 and local/state codes. In Canada, electrical grounding is to be in accordance with the Canadian Electric Code (CSA) C22.1.

This unit is designed for 3-phase operation. DO NOT OPERATE ON A SINGLE PHASE POWER SUPPLY. SEE THE PRECEDING WARNING.

Measure the power supply to the unit.

The supply voltage must be in agreement with the unit nameplate power requirements and within the range shown in the table.

Sign off on the electrical service inspection

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.

The only item to be maintained on a regular basis by the user is the circulating air filter(s).

Circulating air filter(s) cleaned or replaced?

Sign off on the air filter maintenance

The blower uses a belt drive motor that has an adjustable sheave. The factory setting for the DAT0904 is 4 turns open and the DAT1204 is 3 turns open.

- Loosen the set screw as shown below.

- With the sheave stationary - rotate the other half clock-wise (screw in).

To decrease the airflow perform the same as above but rotate the sheave counterclockwise (screw out).

The following table can be used as guide for system airflow:;

Check for any damage on the unit

Check the equipment model number

If an incorrect unit is supplied, do not install and return to the supplier

Check the evaporator coil for high-pressure inert gas holding charge

Sign off on the delivery inspection