Drain Piping Work; Electrical Wiring; Power Supply Wiring - Mitsubishi Electric CITY MULTI PFFY-P25VLEM-A Manuel D'installation

Cautions on refrigerant piping
s s s s s Be sure to use non-oxidative brazing for brazing to ensure that no for-
eign matter or moisture enter into the pipe.
s s s s s Be sure to apply refrigerating machine oil over the flare connection seat-
ing surface and tighten the connection using a double spanner.
Warning:
When installing and moving the unit, do not charge it with refrigerant other
than the refrigerant (R407C) specified on the unit.
- Mixing of a different refrigerant, air, etc. may cause the refrigerant cycle to mal-
function and result in severe damage.
Caution:
• Low residual oil piping must be used.
Residual oil in piping = 30 mg/10 m or less
Residual oil in joints = 5 mg/joint or less
- If there is a large amount of residual oil (hydraulic oil, etc.) inside the piping
and joints, deterioration of the refrigerator oil will result.
• Never use existing refrigerant piping.
- The large amount of chlorine in conventional refrigerant and refrigerator oil
in the existing piping will cause the new refrigerant to deteriorate.
• Store the piping to be used during installation indoors and keep both
ends of the piping sealed until just before brazing.
- If dust, dirt, or water gets into the refrigerant cycle, the oil will deteriorate and
the compressor may fail.
• Use Suniso 4GS or 3GS (small amount) refrigerator oil to coat the flare
and flange connection part.

7. Electrical wiring

Precautions on electrical wiring
Warning:
Electrical work should be done by qualified electrical engineers in accord-
ance with "Engineering Standards For Electrical Installation" and supplied
installation manuals. Special circuits should also be used. If the power cir-
cuit lacks capacity or has an installation failure, it may cause a risk of elec-
tric shock or fire.
1. Be sure to take power from the special branch circuit.
2. Be sure to install an earth leakage breaker to the power.
3. Install the unit to prevent that any of the control circuit cables (remote control-
ler, transmission cables) is brought in direct contact with the power cable out-
side the unit.
4. Ensure that there is no slack on all wire connections.
5. Some cables (power, remote controller, transmission cables) above the ceiling
may be bitten by mouses. Use as many metal pipes as possible to insert the
cables into them for protection.
<Table 1>
System configuration
Transmission cable length
Facility example Residence or independent store
(for noise judgment) without noise
VCTF, VCTFK, CVV, CVS, VVR,
Types of transmission
VVF, VCT or shielding wire
cables
CVVS or CPEVS
2. Remote controller cables
Non-shielding wire for up to 10 m; the same specifica-
Types of cables tions as "1." Wiring transmission cables for more than
10 m
Cable diameter More than 0.5 to 0.75 mm
Add any portion in excess of 10 m to within the longest
Length allowable transmission cable length 200 m (Shielding
portion is more than 1.25 mm
For a single-refrigerant system
Less than 120 m
Building, clinic, hospital or communications
station without noise supposedly generated
from inverter equipment, private power gen-
erator, high-frequency medical equipment,
radio-used communications equipment and
so on.
Network remote controller
2
2
)
- The refrigerant used in the unit is highly hygroscopic and mixes with water
and will degrade the refrigerator oil.
- If a large amount of Suniso 4GS or 3GS is mixed in the refrigerator oil, com-
pressor trouble may result.

6.2. Drain piping work

1. Ensure that the drain piping is downward (pitch of more than 1/100) to the
outdoor (discharge) side. Do not provide any trap or irregularity on the way.
2. Ensure that any cross-wise drain piping is less than 20 m (excluding the differ-
ence of elevation). If the drain piping is long, provide metal braces to prevent it
from waving. Never provide any air vent pipe. Otherwise drain may be ejected.
3. Put the supplied strainer at the bottom of the drain pan on the side of the body
frame, and connect the supplied drain hose to the end connection. Tighten this
end connection using the supplied hose hand.
4. Use a VP30 pipe or equivalent for collecting pipe if it is needed, and pipe it
giving a downward pitch of more than 1/100.
5. Provide sufficient insulation just as for refrigerant piping.
[Fig. 6.2.1] (P.3)
A Indoor unit
C Drain pan
E Drain hose (accessory)
Caution:
Pipe the drain piping to ensure that it discharges drain, and insulate it to
prevent dew condensation. A failure to the piping work may cause water
leakage and so wet your property.
6. Never connect the power cable to leads for the transmission cables. Otherwise
the cables would be broken.
7. Be sure to connect control cables to the indoor unit, remote controller, and the
outdoor unit.
8. Put the unit to the ground on the outdoor unit side.
9. Select control cables from the conditions given in page 7 .
Caution:
Be sure to put the unit to the ground on the outdoor unit side. Do not con-
nect the earth cable to any gas pipe, water pipe, lightening rod, or telephone
earth cable. Incomplete grounding may cause a risk of electric shock.
Types of control cables
1. Wiring transmission cables
• Types of transmission cables
Design wiring in accordance with the following table <Table 1>.
• Cable diameter
More than 1.25 mm 2
More than 120 m
Shielding wire CVVS or CPEVS

7.1. Power supply wiring

• Power supply cords of appliances shall not be lighter than design 245 IEC or
227 IEC.
• A switch with at least 3 mm contact separation in each pole shall be provided
by the Air conditioner installation.
Power cable size: more than 1.5 mm
[Fig. 7.1.1] (P.3)
A Switch 16 A
C Indoor unit
D Total operating current be less than 16 A
E Pull box
B Strainer (accessory)
D Hose band (accessory)
For a multi-refrigerant system
Regardless of length
All facilities
2
B Overcurrent protection 16 A
7