Mitsubishi Electric PAC-IF051B-E Installation Manual page 13

4. Electrical work
4.2 Connecting the main controller
4.2.1 Connect the main controller cable to FTC4 (Master)
Connect the main controller cable to 11 and 12 on the terminal block (TBI. 2) on the
FTC4 (Master) controller. <Fig. 4.2.1>
Wiring wire No. × size (mm²): 2 × 0.3 (non polar)
The 10 m wire is attached as an accessory. Max. 500 m
Wiring size must comply with the applicable local and national codes.
Circuit rating: 12V DC
Circuit rating is NOT always against the ground.
Location to place the main controller
When using the Remote controller options (refer to section 4.3), place the main
controller on appropriate location that meets the following points to detect room
temperature.
• Do not place the main controller in the periphery of a door or a window.
• Do not place the main controller near heat or cold sources, such as a radiator or the like.
Notes:
Wiring for main controller cable shall be (5 cm or more) apart from power
source wiring so that it is not influenced by electric noise from power source
wiring. (Do not insert main controller cable and power source wiring in the
same conduit.) (Refer to Fig. 4.1.1)
When wiring to TBI.2, use the ring type terminals and insulate them from the
cables of adjoining terminals.
4.2.2 Installing the main controller
1. The main controller can be installed either in the switch box or directly on the
wall. Perform the installation properly according to the method.
(1) Secure clearances shown in <Fig. 4.2.2> regardless of whether installing the
main controller either directly on the wall or in the switch box.
(2) Prepare the following items in the field.
Double switch box
Thin metal conduit
Locknut and bushing
Cable cover
Wall plug
2. Drill an installation hole in the wall.
■ Installation using a switch box
• Drill a hole in the wall for the switch box, and install the switch box in the hole.
• Fit the conduit tube into the switch box.
■ Direct wall installation
• Drill a cable access hole and thread the main controller cable through it.
Caution:
To prevent entry of dew, water, and insects, seal the gap between the cable
and the hole through which the cable is threaded with putty. Otherwise, elec-
tric shock, fire, or failure may result.
3. Have the main controller ready.
Remove the back cover from the main controller.
4. Connect the main controller cable to the terminal block on the back cover.
Modify the main controller cable as shown in <Fig. 4.2.5>, and thread the cable
from behind the back cover.
Completely thread the cable to the front so that the unsheathed part of the cable
cannot be seen behind the back cover.
Connect the main controller cable to the terminal block on the back cover.
■ Direct wall installation
• Seal the gap between the cable and the hole through which the cable is
threaded.
Caution
To prevent electric shock or failure, keep the sheath ends or any other
foreign objects out of the terminal block.
Do not use ring terminals to connect the wires to the terminal block on the
back cover. The terminals will come in contact with the control board and the
cosmetic cover, which will result in failure.
Completely thread the
unsheathed portion to the front.
Sheath
Front
Back
10mm
6mm
Thread the cable.
Main controller profile
Installation pitch
Cosmetic cover and front cover
The 2 inner wires must not be
seen on the back.
Connect the 2 inner wires to the
terminal block (non polarized).
<Fig. 4.2.5>
<Fig. 4.2.1>
30 30
46
<Fig. 4.2.2>
Wall
Conduit tube
Locknut
Switch box
Bushing
Seal the gap with putty.
Main controller cable
<Fig. 4.2.3>
<Fig. 4.2.4>
Thread the cable from behind
the main controller.
TBI.2 RC
Required clearances
surrounding the main
controller
Back cover
Main controller cable
Seal the gap with putty.
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