Remote Installation Of Main Controller - Mitsubishi Electric Ecodan EHST20 serie Para El Instalador

5
System Set Up

remote installation of Main Controller

The following instructions are related to a system controlled as in Control option C.
<Accessory>
Main controller cover
<removing the main controller from the cylinder unit>
1. Open front panel of cylinder unit. (See Section 4.2.)
2. Remove the four screws from the metal back plate of main controller using a
screwdriver. (Figure 5.4.1.)
3. Untwist wire clip and lift off the metal back plate.
4. Gently pull apart the clips holding the main controller in place. Be careful not
to use too much force as this may break the holding clips.
5. Lift out the main controller from the front panel of the cylinder unit.
6. Separate the back and front plates using a flat head screwdriver as shown in
Figure 5.4.2.
7. Fix the 2 core cable from the FTC4 into the terminal. Ensure the wires make
good contact and are securely screwed into the terminal block. (Figure 5.4.3)
8. The inner core wires should not be visible from the outside of the back plate.
(Figure 5.4.3)
9. The sheathed cable should be pressed into the sunken channel so it is flush
with the back plate.
10. Once the connection cable is in place screw the back plate to the wall using
screws (field supply) suitable for use on the chosen wall . (Figure 5.4.4)
11. Finally replace the front plate.
note: Wiring for main controller cable shall be (5 cm or more) apart from
power source wiring so that it is not influenced by electrical noise
from power source wiring. (do nOt insert main controller cable and
power source wiring in the same conduit.)
Metal back plate
Wire clip
Holding clips
<Figure 5.4.1>
Removing main controller
Terminal block for controller - FTC4
connection cable
Front plate
<Figure 5.4.2>
Opening the main controller
10 mm
6 mm
<Figure 5.4.3>
Securing the connection cable
<Figure 5.4.4>
Securing the back plate to the wall
Main controller
Back plate
32