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8. Electrical work
8.1. Power supply
Electrical specification
Power supply
SEZ-M25 SEZ-M35 SEZ-M50 SEZ-M60 SEZ-M71
(1 phase ~/N, 230V, 50Hz)
10
Warning:
• The compressor will not operate unless the power supply phase
connection is correct.
• Grounding protection with a no-fuse breaker (earth leakage breaker [ELB])
is usually installed for Ⓓ.
• The connection wiring between the outdoor and indoor units can be
extended up to a maximum of 50 meters, and the total extension including
the crossover wiring between rooms is a maximum of 80 m.
A switch with at least 3 mm contact separation in each pole shall be provided
by the air conditioner installation.
* Label each breaker according to purpose (heater, unit etc.).
[Fig. 8-1] (P.5)
Ⓐ Indoor unit
Ⓑ Outdoor unit
Ⓒ Signal receiving unit
Ⓓ Wireless remote controller
Ⓔ Main switch/fuse
Ⓕ Grounding
8.2. Indoor wire connection
Work procedure
1. Remove 2 screws to detach the electric component cover.
2. Route each cable through the wiring intake into the electric component box.
(Procure power cable and in-out connecting cable locally and use remote control
cable supplied with the unit.)
3. Securely connect the power cable and the in-out connecting cable and the
remote control cable to the terminal blocks.
4. Secure the cables with clamps inside the electric component box.
5. Attach the electric component cover as it was.
• Fix power supply cable and indoor/outdoor cable to control box by using buffer
bushing for tensile force. (PG connection or the like.)
Warning:
• Attach the electrical part cover securely. If it is attached incorrectly, it could
result in a fire, electric shock due to dust, water, etc.
• Use the specified indoor/outdoor unit connecting wire to connect the
indoor and outdoor units and fix the wire to the terminal bed securely so
that no stress is applied to the connecting section of the terminal bed.
Incomplete connection or fixing of the wire could result in a fire.
[Fig. 8-2-1] (P.5)
Ⓐ Screw holding cover (2 pcs)
Ⓑ Cover
[Fig. 8-2-2] (P.5)
Ⓐ Terminal bed box
Ⓑ Knockout hole
Ⓒ Remove
[Fig. 8-2-3] (P.5)
Ⓔ 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.
Ⓕ Indoor/outdoor unit connecting wire
Ⓖ Tensile force
Ⓗ Use ordinary bushing
Ⓘ Signal receiving unit wiring
[Fig. 8-2-4] (P.5)
Ⓙ Terminal bed for power source and indoor transmission
Ⓚ Indoor/outdoor unit connecting wire
Ⓛ Connecting the signal receiving unit
Connect the signal receiving unit to the CN90 (Connect to the wireless remote controller
board) on the indoor unit using the supplied remote controller wire. Connect the signal
receiving units to all the indoor units.
[Fig. 8-3] (P.6)
Ⓐ Indoor terminal block
Ⓑ Earth wire (green/yellow)
Ⓒ Indoor/outdoor unit connecting wire 3-core 1.5 mm
Ⓓ Outdoor terminal block
Ⓔ Power supply cord
Ⓕ Indoor controller board
① Connecting cable
Cable 3-core 1.5 mm
, in conformity with Design 245 IEC 57.
2
② Indoor terminal block
③ Outdoor terminal block
④ Always install an earth wire (1-core 1.5 mm
⑤ Signal receiving unit cable (accessory) (wire length : 5 m)
⑥ Signal receiving unit
⑦ Power supply cord
16
Input capacity Main Switch/Fuse (A)
10
20
20
2
or more
) longer than other cables
2
• Perform wiring as shown in [Fig. 8-3] (P.6). (Procure the cable locally.)
Make sure to use cables of the correct polarity only.
• Connect the terminal blocks as shown in [Fig. 8-3] (P.6).
20
Caution:
• Use care not to make mis-wiring.
• Firmly tighten the terminal screws to prevent them from loosening.
• After tightening, pull the wires lightly to confirm that they do not move.
8.3. Remote controller
8.3.1. For wireless remote controller
1) Installation area
• Area in which the remote controller is not exposed to direct sunshine.
• Area in which there is no nearby heating source.
• Area in which the remote controller is not exposed to cold (or hot) winds.
• Area in which the remote controller can be operated easily.
• Area in which the remote controller is beyond the reach of children.
2) Installation method [Fig. 8-4] (P.6)
① Attach the remote controller holder to the desired location using two tapping
screws.
② Place the lower end of the controller into the holder.
Ⓐ Remote controller
Ⓑ Wall
Ⓒ Display panel
Ⓓ Receiver
• The signal can travel up to approximately 7 meters (in a straight line) within 45
degrees to both right and left of the center line of the receiver.
3) Setting the Model No.
① Insert batteries.
② Press the SET button with something sharp at the end.
blinks and Model No. is lighted.
MODEL SELECT
③ Press the temp
④ Press the SET button with something sharp at the end.
and Model No. are lighted for three seconds, then turned off.
MODEL SELECT
Indoor
SEZ
8.3.2. Signal Receiving Unit
1) Sample system connection
[Fig. 8-5] (P.6)
Only the wiring from the signal receiving unit and between the remote controllers is
shown in Fig. 8-5. The wiring differs depending on the unit to be connected or the
system to be used.
For details on restrictions, refer to the installation manual or the service handbook
that came with the unit.
1. Connecting to Mr. SLIM air conditioner
(1) Standard 1:1
① Connecting the signal receiving unit
Connect the signal receiving unit to the CN90 (Connect to the wireless remote
controller board) on the indoor unit using the supplied remote controller wire.
Connect the signal receiving units to all the indoor units.
2) Setting the pair number switch
[Fig. 8-6] (P.6)
1. Setting method
Assign the same pair number to the wireless remote controller as that of the
indoor unit. If not doing so, the remote controller cannot be operated. Refer to
the installation manual that came with the wireless remote controller for how to
set pair numbers of wireless remote controllers.
Position of daisy wire on the controller circuit board on the indoor unit.
button to set the Model No.
Outdoor
heat pump models
cooling only models
Model No.
026
058
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