17
Opening the Electrical Control Box Cover —
Follow the steps below when removing the top cover.
1. Remove the screws as shown in Fig. 16.
2. Lift up the top cover about 1-1/2 inches and then push it
towards the indoor unit port side as shown in Fig. 17.
Follow the steps below when removing the cover of electric
control box:
3. Remove the screws as shown in Fig. 18.
4. Push the cover about 1/2 inches and then lift up the cover
as shown in Fig. 19.
Completing Electrical Connections —
After the
pipe work is complete, the electrical supply can be connected
by routing the cable through the appropriate casing holes or
knockouts and connecting the supply and ground cables to the
unit’s power terminals.
Be sure the power wiring and control wiring do not cross, as
this might cause disturbance on the controls side.
Use 2-core stranded shielded twisted pair communication
wire. Make sure the control wire does not form a closed loop.
The control wire is polarity sensitive. Figures 20 and 21 show
how to connect the control wiring between the MDC and the
indoor unit. Wiring length limitations must be followed to
avoid any communication interference.
For typical communication wiring diagrams and MDC
wiring see, Figs. 22-24.
Fig. 16 — Removing the Top Cover Screws
Fig. 17 — Removing the Top Cover
Fig. 18 — Removing the Electronic Control Box
Cover Screws
Fig. 19 — Removing the Electronic Control Box
Cover
Fig. 20 — 2-Core Stranded Shielded Twisted Pair
Communication Wire
(Available from Factory as an Accessory)
P Q
P Q
MDC
IDU
Fig. 21 — 2-Core Stranded Shielded Twisted Pair
Communication Wire (Field-Supplied)
P Q
P Q
MDC
IDU
