Mitsubishi Electric CITY MULTI CMB-P-NU-J2 Manuel D'installation page 15

3. Perform insulation work on the drain pipe (PVC TUBE) and on the socket
(including elbow).
4. Check the drainage.
5. Attach the insulating material, and fix it with the band (not supplied) to
insulate the drain port.
Ⓕ
Ⓔ
Ⓐ
Ⓑ Ⓒ Ⓓ
6. Electrical work
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Consult all related regulations and power companies beforehand.
Warning:
Electrical work should be handled by qualified electrical engineers in
accordance with all related regulations and attached instruction manuals.
Special circuits should also be used. If there is a lack of power capacity or
a deficiency in electrical work, it may cause a risk of electric shock or fire.
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Connect all wires securely.
Fix power source wiring to control box by using buffer bushing for tensile
•
force (PG connection or the like).
[Fig. 6.0.1]
B
A Control box
C ø21 mm [7/8 in] hole (closed rubber bushing)
D Transmission wiring
7. Setting addresses and operating units
The address switch of each BC controller is set to "000" when shipped from the factory.
• Set the address switch to 1 + the address of the outdoor unit.
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The BC controller address should generally be set to 1 + the address of the outdoor unit. However, if this would result in it having the same address as
another outdoor unit, set the address between 51 and 100, making sure that it is different from the address of other controllers.
• Please refer to the outdoor unit installation manual.
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When connecting multiple indoor units to one branch port
• Indoor units connected to one branch port can only be operated in the same mode.
• When connecting multiple remote controllers, group setting is required.
8. Checklist after installation
Warning:
After the installation has been completed, check for refrigerant leaks.
- If the refrigerant leaks, oxygen starvation may result. If the leaked refrigerant comes in contact with a heat source, toxic gas will be generated.
After completion of installation work, check the item shown in the table below. If any abnormality is noticed, identify the problem and correct it. Leaving the problem unat-
tended may cause mechanical failure or malfunctions and raise safety risks.
No. Item to be checked
1 Check for refrigerant gas leakage.
9. Test run
Before commencing a test run please check the following:
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After installing, piping and wiring the indoor units and BC controllers, check to see again that there is no refrigerant leakage and no slack on power and
control cables.
Use a 500 V megger to check that there is an insulation resistance of more than 1.0 MΩ between the power terminal block and the ground. If it is less than
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1.0 MΩ, do not operate the unit.
Caution:
Never measure the insulation resistance of the terminal block for any control cables.
A BC controller
B Tie band (not supplied)
C Drain socket NPT 3/4 in
D Adapter (not supplied)
E Drain pipe (not supplied)
F Insulating material (not supplied)
A
C
D
B Power source wiring
2. Discharge test
After completing drain piping work, open the BC controller panel, and test drain
discharge using a small amount of water. Also, check to see that there is no wa-
ter leakage from the connections.
3. Insulating drain pipes
Provide sufficient insulation to the drain pipes just as for refrigerant pipes.
Caution:
Be sure to provide drain piping with heat insulation in order to prevent
excess condensation. Without drain piping, water may leak from the unit
causing damage to your property.
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Never connect the power cable to the terminal board for control cables.
(Otherwise it may be broken.)
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Be sure to wire between the control wire terminal boards for indoor
unit, outdoor unit and BC controller.
Use non-polarized 2-wire as transmission cables.
Use 2-core shielding cables (CVVS, CPEVS, MVVS) of more than 1.25 mm
[AWG16] in diameter as transmission cables.
The switch capacity of the main power to BC controllers and the wire size are as
follows:
Switch (A) Molded case
Capacity Fuse circuit breaker
15 15 20 A
• For other detailed information, refer to the outdoor unit installation manual.
• Power supply cords of appliances shall not be lighter than design 245 IEC 53
or 227 IEC 53.
• A switch with at least 3 mm [1/8 in] contact separation in each pole shall be
provided by the Air conditioner installation.
Caution:
Do not use anything other than the correct capacity fuse and breaker.
Using fuse, conductor or copper wire with too large capacity may cause a
risk of malfunction or fire.
Ensure that the outdoor units are put to the ground. Do not connect the
earth cable to any gas pipe, water pipe, lightening rod or telephone earth
cable. Incomplete grounding may cause a risk of electric shock.
2
Earth leakage
Wire size
breaker
20 A 30 mA
2
1.5 mm [AWG15]
0.1 s or less
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