Wiring Of Main Power Supply And Equipment Capacity; Test Run; The Following Phenomena Do Not Represent Trouble (Emergency) - Mitsubishi Electric CITY MULTI PUHY-TMU-A Installation Manual

h. The group setting operations among the multiple indoor units is done by the remote controller (RC) after the electrical power has been turned on.
<Permissible Lengths>
1 M-NET Remote controller
• Max length via outdoor units: L +L
1
• Max transmission cable length: L
• Remote controller cable length: r
If the length exceeds 10 m [32 ft], use a 1.25 mm
calculation of the maximum length and overall length.
2 MA Remote controller
• Max length via outdoor unit (M-NET cable): L
• Max transmission cable length (M-NET cable): L
Remote controller cable length: c
•

9.4. Wiring of main power supply and equipment capacity

Schematic Drawing of Wiring (Example)
[Fig. 9.4.1] (P.4)
A Switch (Breakers for Wiring and Current Leakage)
C Pull Box
Wire size for Main Power Supply and On/Off Capacities
Minimum Wire Size (mm
Main Cable
Model
Outdoor 80 8.4/8
Unit 100 13.3/6
Indoor Unit
0.41/22
1. Use a separate power supply for the outdoor unit and indoor unit.
2. Bear in mind ambient conditions(ambient temperature,direct sunlight, rain water,etc.) when proceeding with the wiring and connections.
3. The wire size is the minimum value for metal conduit wiring. The power cord size should be 1 rank thicker consideration of voltage drops.
Make sure the power-supply voltage does not drop more than 10 %.
4. Specific wiring requirements should adhere to the wiring regulations of the reglon.
Warning:
• Be sure to use specified wires to connect so that no external force is imparted to terminal connections. If connections are not fixed firmly, it may cause
heating or fire.
• Be sure to use the appropriate type of overcurrent protection switch. Note that generated overcurrent may include some amount of direct current.
Caution:
• Some installation site may require attachment of an earth leakage breaker. If no earth leakage breaker is installed, it may cause an electric shock.
• Do not use anything other than breaker and fuse with correct capacity. Using fuse and wire or copper wire with too large capacity may cause a malfunction
of unit or fire.

10. Test run

10.1. The following phenomena do not represent trouble (emergency)

Phenomenon
Indoor unit and BC controller generate sound
at the cooling/heating change over sometime.
The auto vane runs freely.
Fan setting changes during heating.
Fan stops during heating operation.
Fan does not stop while operation has been
stopped.
No setting of fan while start SW has been
turned on.
Outdoor unit does not operate by turning
switch on.
Indoor unit remote controller shows "HO" in-
dicator for about two minutes when turning
ON universal power supply.
Drain pump does not stop while unit has been
stopped.
Drain pump continues to operate while unit
has been stopped.
+L +L and L +L +L +L and L +L
2 3 4 1 2 3 5 1
and L +L and L +L and L and L
1 3 4 3 5 6 2
, r , r , r 10 m [32 ft] (0.3 to 1.25 mm
=
1 2 3 4
+L +L +L and L +L +L
1 2 3 4 1 2
and L +L and L and L
1 3 4 6
and c and c
+c +c +c +c +c
1 1 2 3 1 2 3
B Outdoor Unit
D Indoor Unit
2
/AWG)
Branch Ground
– 8.4/8
– 13.3/6
0.41/22 0.41/22
Display of remote controller
Normal display
Normal display
Normal display
Defrost display
No lighting
Heat ready
Normal display
"HO" flashes
Light out
2
+L 500 m [1640 ft] (1.25 mm [AWG 16] or more)
=
2 6
+L 200 m [656 ft] (1.25 mm 2 [AWG 16] or more)
=
6
2 [AWG 22 to 16] )
2
[AWG 16] shielded wire. The length of this section (L
2
500 m [1640 ft] (1.25 mm [AWG 16] or more)
=
6
2
+L 200 m [656 ft] (1.25 mm [AWG 16] or more)
=
2 6
200 m [656 ft] (0.3 to 1.25 mm
=
4
Switch (A) Breaker for
Capacity Fuse
Wiring (NFB)
60 60
75 75
15 15
This is not a trouble as it is just a selecting sound.
Because of the control operation of auto vane, it may change over to horizontal
blow automatically from the downward blow in cooling in case the downward
blow operation has been continued for 1 hour. At defrosting in heating, hot adjust-
ing and thermostat OFF, it automatically changes over to horizontal blow.
Ultra-low speed operation is commenced at thermostat OFF.
Light air automatically changes over to set value by time or piping temperature at
thermostat ON.
The fan is to stop during defrosting.
Fan is to run for 1 minute after stopping to exhaust residual heat (only in heating).
Ultra low-speed operation for 5 minutes after SW ON or until piping temperature
becomes 35°C, low speed operation for 2 minutes thereafter, and then set notch
is commenced. (Hot adjust control)
When the outdoor unit is being cooled and the refrigerant is resting, warming up
operation is performed for at least 35 minutes to warm the compressor.
During this time, only the fan operates.
System is being driven.
Operate remote controller again after "HO" disappear.
After a stop of cooling operation, unit continues to operate drain pump for three
minutes and then stops it.
Unit continues to operate drain pump if drainage is generated, even during a
stop.
) should be included in the
8
2 [AWG 22 to 16] )
Breaker for Current Leakage
75A 50A 100mA 0.1sec. or less
75A 60A 100mA 0.1sec. or less
15A 20A 30mA 0.1sec. or less
Cause
11