DAIKIN KEH041A46 (01) PDF Document

Read these safety considerations carefully before installing the drain pan heater. After completing the installation, check if the unit operates properly during the start-up operation.

DANGER: Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

• Do not touch the heater unit without wearing gloves. The temperature of the heater unit will become high when the heater is turned on. Touching the heater unit with bare hands will result in burns or injury.

WARNING: Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

• Request the dealer or an authorized technician to install the product. Improper installation could result in water leakage, an electrical shock, or fire.

• The product must be installed according to the instructions given in this manual. Incomplete installation could result in water leakage, an electrical shock, or fire.

• Use the supplied or specified installation parts. Use of other parts could result in the unit becoming loose and falling, water leakage, electrical shocks, or fire.

• Turn OFF the power supply at the time of installation. Touching any electrical parts with the power supply turned on could result in electrical shocks.

• Use specified wires. Connect and fix the wires so that the wires will not put improper force on the terminal junctions. Wires connected or fixed improperly could result in terminal overheating, an electrical shock, or fire.

• When wiring and connecting the indoor and outdoor units, carefully arrange the wiring so that they will not put improper force on the structures. Install covers over the wires. Incomplete cover installation could result in terminal overheating, an electrical shock, or fire.

CAUTION: Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It may also be used to alert against unsafe practices.

• Wear protective gloves at the time of installation. Touching the suction mouth or aluminum fin of the outdoor unit may result in injury.

• Do not install the product in places where there is danger of exposure to inflammable gas leakage. If the gas leaks and builds up around the unit, it may catch fire.

• Do not grab the top plate of the outdoor unit carelessly when removing the top plate. The sharp edge of the top plate may cause injury.

• Do not install the outdoor unit in places where small animals may nest in the outdoor unit. If small animals intrude and touch the internal parts of the outdoor unit, it may malfunction, generate smoke, or ignite. Advise the user to keep the place clean.

• Do not touch the heater unit with bare hands. The temperature of the heater unit will become high when the heater is turned on. Touching the heater unit with bare hands may result in burns or injury.

The DAIKIN KEH041A46 is a heater designed to melt snow that is blown into the product from the outside to prevent the drain pan of the outdoor unit from freezing. If this product is used in heavy snow areas, it should be installed with a snow-break hood on a high stand.

Note: Appearance of the drain pan heater and fixing plate may differ from some models.

The following tools are required for installation:

• Electric drill

• ø1/8” (ø3.2mm) drill

• ø5/32″ (ø4mm) drill

• Phillips screwdriver

• Nippers

Before you begin, be sure to check that the power supply of the product is turned off.

1. Remove the stop valve cover.

• Affix the Information label near the manufacturer’s label.

2. Remove the service lid.

3. Remove the top plate.

4. Remove the anti-drip cover, if included.

5. Remove the front plate.

• Affix the electric wiring diagram label where there is enough space available on the back of the front plate.

The number and type of screws to be removed for the DAIKIN KEH041A46 are as follows:

Note: The appearance of the outdoor unit and the number of screws may differ from some models.

1. Remove the fixing screw (Hexagon tapping screw) at the lower section of the fan motor base, and remove the fan motor base together with the propeller fan.

• Do not remove the fan motor harness.

• Be careful so that the fan motor harness does not come into contact with the edges of the heat exchanger or other components.

• Place the removed fan motor base so that stress is not applied on the propeller fan.

CAUTION:

• When drilling a hole, be careful not to damage the soundproofing material and other components on the back side.

• Make the ground plate closely adhere to the partition.

• Install the drain pan heater in a position where it does not come into contact with the fan motor base.

Installation Steps:

1. To fix the drain pan heater, drill ø1/8” (ø3.2mm) holes in the bottom frame and the partition plate. For the DAIKIN KEH041A46, you need to drill 4 holes in the bottom frame and 2 holes in the partition plate, for a total of 6 holes.

• Place the actual components to ensure positioning is correct before drilling holes.

• The hole can be made with the included piercing-screw as well.

2. Install the drain pan heater.

• Insert the plate under the heat exchanger.

• For the DAIKIN KEH041A46, place the fixing plate (K).

3. Fix the drain pan heater with the piercing screw (B).

Follow these steps to route the harnesses for the DAIKIN KEH041A46:

1. Drill ø5/32″ (ø4mm) holes in the partition plate for installing the snap band. (1 location)

2. Insert the snap band into the drilled hole.

3. Install the fan motor base.

• Hook the harness of the fan motor base on the hook of the electrical parts box.

4. Hook the harness of the drain pan heater on the hook of the electrical parts box to fix it.

5. Bind the harnesses and the thermostat with the binding band (D). (3 locations)

• Cut the tip of the binding band.

When drilling, drill a hole in alignment with the actual component and at a position where the harness will not become loose or too tense.

Connect the FastOn terminals of the drain pan heater to the terminal block of the outdoor unit.

1. Connect the thermostat-side terminal (black harness) to the leftmost terminal.

2. Connect the heater-side terminal (white harness) to the second leftmost terminal.

Install each component to its original position. Be careful not to confuse screw types.

1. Install the terminal block.

• Secure the terminal block so that it does not lift up.

2. Install the fan motor base.

3. Install the front plate.

4. Install the anti-drip cover, if provided.

5. Install the top plate.

Before powering on the unit, perform the following checks:

1. Check that the drain pan heater has been properly installed, wiring has been properly performed, and the removed components have been returned to their original positions.

2. Check the insulation resistance of the drain pan heater.

• Use a tester (500 VDC) to check that the insulation resistance between terminal ① and the ground terminal, and between terminal ② and the ground terminal is equal to or higher than 1MΩ.

3. Check the continuity of the outdoor unit.

• Use the tester to check that the continuity between the screw on the front grille and the ground terminal reads 0Ω.

• If there is no continuity, retighten the screws securing the front plate and the bottom frame to increase the area of contact with the screw. Then, carry out the continuity test again.

CAUTION: The drain pan heater is hot; do not touch it with bare hands.

After powering on the unit, check the following:

• Turn on the power supply and check that the temperature of the drain pan heater will rise.

• Touch the bottom of the outdoor unit by hand and check the temperature rise.

• If the outdoor temperature is high, the heater will not be energized, which is not a failure. The thermo sensor operates as follows:

• Turned on at 23°F (-5°C)

• Turned off at 34°F (1°C)

Install the remaining components to their original positions. Be careful not to confuse screw types.

1. Install the service lid.

2. Install the stop valve cover.