Connecting Electrical Wires; Selecting The External Static Pressure; Setting Addresses; Sensing Room Temperature With The Built-In Sensor In A Remote Controller - Mitsubishi Electric PFFY-P-VLRMM-E Installation Manual

7.3. Connecting electrical wires

(Ensure that there is no slack on terminal screws.)
Make sure that the model name in the operation manual attached to the control
box cover is the same as that on the rating plate.
1. Remove the screw (2pcs) holding the cover to dismount the cover.
2. Open knockout holes.
(Recommend to use a screwdriver or the like for this work.)
[Fig. 7.3.1] (P.4)
A Control box
C Screw
E Remove
3. Fix power source wiring to control box by using buffer bushing for tensile force.
(PG connection or the like.) Connect transmission wiring to transmission ter-
minal block through the knockout hole of control box using ordinary bushing.
[Fig. 7.3.2] (P.4)
A Use PG bushing to keep the weight of the cable and external force from being
applied to the power supply terminal connector. Use a cable tie to secure the
cable.
B Power source wiring
D Use ordinary bushing
4. Connect the power source, Earth, transmission and remote controller wiring.
[Fig. 7.3.3] (P.4)
A Power source terminal block
C Terminal block for remote controller D To 1-phase power source
E Transmission line DC 30 V
F Terminal block for outdoor transmission line (TB3)
G Transmission line to the remote controller, terminal block for indoor unit and BC
controller
[Shield wire connection]
[Fig. 7.3.4] (P.4)
A Terminal block
C Shield wire
D The earth wire from two cables are connected together to the S terminal. (Dead-
end connection)
E Insulation tape (To keep the earth wire of the shielded cable from coming in con-
tact with the transmission terminal)
5. After wiring is complete, make sure again that there is no slack on the connec-
tions, and attach the cover onto the terminal block box in the reverse order of
removal.
Notes:
• Do not pinch the cables or wires when attaching the terminal block box
cover. Doing so may cause a risk of disconnection.
• When accommodating the terminal block box, make sure that the con-
nectors on the box side are not removed. If removed, it cannot operate
normally.
Caution:
Fix the electrical wires at site using clamps.
Caution:
Wire the power supply so that no tension is imparted. Otherwise disconnec-
tion, heating or fire may result.

7.4. Selecting the external static pressure

As the factory setting is for use under an external static pressure of 20 Pa, no
switch operation is needed when using under the standard condition.
External static pressure
20 Pa
40 Pa
60 Pa
[Fig. 7.4.1] (P.4)
<Address board>
10
B Cover
D Knockout hole
C Tensile force
E Transmission wiring
B Terminal block for indoor transmission
B Round terminal
Switch operation
3
2
2
1
1
SWA SWC
3
2
2
1
1
SWA SWC
3
2
2
1
1
SWA SWC

7.5. Setting addresses

(Be sure to operate with the main power turned OFF.)
[Fig. 7.4.1] (P.4)
<Address board>
• There are two types of rotary switch setting available: setting addresses 1 to 9
and over 10, and setting branch numbers.
1 How to set addresses
Example: If Address is "3", remain SW12 (for over 10) at "0", and match
SW11(for 1 to 9) with "3".
2 How to set branch numbers SW14 (Series R2 only)
The branch number assigned to each indoor unit is the port number of the
BC controller to which the indoor unit is connected.
Leave it to "0" on the non-R2 series of units.
• The rotary switches are all set to "0" when shipped from the factory. These
switches can be used to set unit addresses and branch numbers at will.
• The determination of indoor unit addresses varies with the system at site. Set
them referring to the Data Book.
7.6. Sensing room temperature with the
built-in sensor in a remote controller
If you want to sense room temperature with the built-in sensor in a remote control-
ler, set SW1-1 on the control board to "ON". The setting of SW1-7 and SW1-8 as
necessary also makes it possible to adjust the air flow at a time when the heating
thermometer is OFF.