Specifications

2.1.3 Tests to be done after Electric Heater Mounting

 Procedures of Confirmation Test and Test Run

1. Check the entire electric wiring again to see that all wires have been connected correctly.

2. Thoroughly check the wire clamps and set screws to see whether or not they are loosened.

3. Make sure that the electric heater is mounted at the correct position in the air conditioner, and also check

to see whether or not there is found any wire coming in contact with electric heater element.

4. Check the capacity of the power fuse.

5. Conduct the insulation resistance test in the following manner before energizing the electric heater:

Using a DC500V megger, measure the voltage between the earth and the point where the terminal at

loading side of the electric contactor for electric heater is connected to the terminal for operation circuit,

and make sure that the measured value is over 1 MΩ.

6. Check the fan rotating direction.

To operate the fan,

(1) Set the cooling / heating selector switch in the control panel to HEAT.

(2) Press the run operation button FAN.

Then, the green indication lamp lights up and the fan starts rotating. At this time check to see that the

fan rotates in the direction of the arrow which is stamped on the fan motor.

7. After verifying that the fan is rotating (properly and in the correct direction), press COOL / HEAT button.

Verify that hot air blows and heating operation proceeds. (At this time, turn the temperature controller

knob to an appropriate position.)

8. Disconnect the wires from the fan motor or remove the fan belt to stop the fan rotation, and repeat the

above steps 6 and 7 to energize the heater alone. In this state, verify that the overheat protection

thermostat is actuated when temperature rises and the electricity running to the heater is stopped. In this

case, be sure to remove the thermal fuse and shortcircuit the line before starting operation. (Make this

confirmation without fail because this is a very important check to prevent fire accident due to the electric

heater.)

9. When the actuation of the overheat protection thermostat has been duly confirmed, immediately turn off

the power switches of the air conditioner and the electric heater, and conduct the insulation resistance

test and make sure that the measured value is over 0.4MΩ.

10.When the actuation of the overheat protection thermostat has been duly confirmed, reconnect the wires

to the fan motor or place the fan belt back in position, re-fit the thermal fuse and remove the shortcircuit

wire and then, follow the above step 6 once again to make sure the heating operation is performed

properly.