Daikin Maverick I MPS 7-12T: Unit Maintenance

If during inspection the flue passageways and exhaust system are determined to require cleaning, the following procedures should be followed (by a qualified installer, service agency, or gas supplier):

• Turn OFF the electrical power to the unit and set the thermostat to the lowest temperature.

• Shut OFF the gas supply to the unit either at the meter or at manual valve in the supply piping.

• Remove the furnace controls access panel and the control box cover. Disconnect the gas supply piping from the gas valve.

• Disconnect the gas supply piping from the gas valve.

• Disconnect the wiring to the induced draft blower motor, gas valve, flame sensor, and flame roll-out control, and ignitor cable. Mark all wires disconnected for proper reconnection.

• Remove the screws (4) connecting the burner tray to the heat exchanger mounting panel.

• Remove the burner tray and the manifold assembly from the unit.

• Remove the screws (5) connecting the induced draft blower to the collector box and screws (18) connecting the collector box to the heat exchanger center panel. Remove the induced draft blower and the collector box from the unit.

• Remove the screws (3) connecting the divider plate to the heat exchanger center panel.

• Remove the turbulators from inside the heat exchangers by inserting the blade of a screwdriver under the locking tabs. Pop the tabs out of the expanded grooves of the heat exchanger. Slide the turbulators out of the heat exchangers.

• Direct a water hose into the outlet of the heat exchanger top. Flush the inside of each heat exchanger tube with water. Blow out each tube with air to remove excessive moisture.

• Reassemble (steps 1 through 10 in reverse order). Be careful not to strip out the screw holes used to mount the collector box and inducer blower. Replace inducer blower gasket and collector box gasket with factory replacements if damaged.

To Inspect the Evaporator Coil

• Remove the filter access panel and the blower/ evaporator coil access panel. Remove the filters.

• Shine a flashlight on the evaporator coil (both sides) and inspect for accumulation of lint, insulation, etc.

• If coil requires cleaning, follow the steps shown below.

Cleaning Evaporator Coil

• The coil should be cleaned when it is dry. If the coil is coated with dirt or lint, vacuum it with a soft brush attachment. Be careful not to bend the coil fins.

• If the coil is coated with oil or grease, clean it with a mild detergent-and-water solution. Rinse the coil thoroughly with water. Important: Do not use excessive water pressure. Excessive water pressure can bend the fins and tubing of the coil and lead to inadequate unit performance. Be careful not to splash water excessively into unit.

• Inspect the drain pan and condensate drain at the same time the evaporator coil is checked. Clean the drain pan by flushing with water and removing any matters of obstructions which may be present.

• Go to next section for cleaning the condenser coil.

Cleaning Condenser Coil, Condenser Fan, Circulation Air Blower and Venturi

• Remove the compressor access panel. Disconnect the wires to the condenser fan motor in the control box (see wiring diagram). Remove the wires from the opening in the bottom of the control box.

• Remove the screws securing the condenser top panel and remove the panel with condenser fan motor and grille attached.

• The coil should be cleaned when it is dry. If the coil is coated with dirt or lint, vacuum it with a soft brush attachment. Be careful not to bend the coil fins.

• If the coil is coated with oil or grease, clean it with a mild detergent-and-water solution. Rinse the coil thoroughly with water. Important: Do not use excessive water pressure. Excessive water pressure can bend the fins and tubing of the coil and lead to inadequate unit performance. Be careful not to splash water excessively into unit.

• The venturi should also be inspected for items of obstruction such as collections of grass, dirt or spider webs. Remove any that are present.

• Inspect the circulating air blower wheel and motor for accumulation of lint, dirt or other obstruction and clean it as necessary. Inspect the blower motor mounts and the blower housing for loose mounts or other damage. Repair or replace if necessary.

Re-Assembly

• Place the condenser top panel back on the unit and replace all screws.

• Run the fan motor wires through the hole in the bottom of the control box. Reconnect fan motor wires per the wiring diagram attached to the back of the cover.

• Replace the filter and blower/evaporator coil access panels.

• Replace the control box cover and controls access panel.

• Restore electrical power to the unit and check for proper operation, especially the condenser fan motor.