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Heat insulation
Apply heat insulation for the pipes separately at liquid side and gas side.
• For the heat insulation to the pipes at gas side, be sure to use the material with heat-resisting temperature
248 °F (120 °C) or higher.
• Using the attached heat insulation material, apply the thermal insulation to the pipe connecting section of the
indoor unit securely without gap.
REQUIREMENT
• Apply the heat insulation to the pipe connecting section of the indoor unit securely up to the root without exposure of
the pipe. (The pipe exposed to the outside causes water leak.)
• Wrap heat insulator with its slits facing up (ceiling side).
Indoor unit
Union
Heat insulation
pipe
(Accessory)
Flare nut
Heat insulator
of the pipe
Wrap the pipe with the attached heat insulator
without any gap between the indoor unit.
The seam must be faced upward
(ceiling side).
Banding band
(Accessory)
10
Electric wiring
WARNING
•
Use predefined wires and connect them certainly.
Keep the connecting terminals free from external force.
Improper wire connection or clamping may result in exotherm, fire or malfunction.
•
Connect earth wire. (grounding work)
Incomplete grounding cause an electric shock.
Do not connect earth wires to gas pipes, water pipes, lightning rods or earth wires for telephone wires.
•
The electric work must satisfy all local, national and international regulations.
Use an exclusive power supply circuit for the unit at the rated voltage.
Capacity shortage of power circuit or incomplete installation may cause an electric shock or a fire.
CAUTION
Be sure to install an earth leakage breaker.
If an earth leakage breaker is not installed, an electric shock may be caused.
REQUIREMENT
• Perform electrical wiring according to local regulations of each region.
• Perform electrical wiring of the outdoor unit according to the Installation Manual of the outdoor unit.
• Do not connect 220–240 V power to the communication terminal blocks (
,
,
,
) for control wiring.
(Otherwise, the system will fail.)
• Perform electrical wiring so that wires do not come in contact with hot parts of the pipes; otherwise, heat from the
pipes melts the covering of wires and an accident may result.
• After connecting wires to the terminal blocks, provide a trap and fix wires with the cord clamp.
• Arrange the transition wiring and the refrigerant piping so that they are in the same group.
• Do not turn on the indoor unit before vacuuming of refrigerant piping is finished.
Power specifications
Wiring and remote controller wire should be locally procured.
See the table below for the power specifications. If the capacity is too small, the unit will suffer from overheating or
burnout.
Refer to the Installation Manual of the outdoor unit for the power capacity or electric wire specifications of the
outdoor unit.
Item
Model name
MMD-
Power supply for Air to Air Heat Exchanger with DX Coil Unit (*1)
Power supply
Wiring for the power
supply
Air to Air Heat
Exchanger with
DX Coil Unit
VNK502HEX1E
VN502HEX1E
VNK802HEX1E
VN802HEX1E
I-phase 50 Hz 220-240 V
I-phase 60 Hz 220 V
Current rating (Fuse rating)
of circuit breaker (switch)
for indoor units should be
selected by the
accumulated total current
values of the indoor units.
cable 3-core 2.5 mm
2
, in
conformity with Design
60245 IEC66
VNK1002HEX1E
VN1002HEX1E
I-phase 50 Hz 220-240 V
VNK1002HEX1E2
VN1002HEX1E2
I-phase 60 Hz 220 V
(*1)
• For the power supply of the indoor unit, prepare the exclusive power supply separated from that of the outdoor unit.
U
1
U
2
A
B
123-EN
124-EN
+00EH99887601-2_01EN.book Page 62 Thursday, September 15, 2016 5:23 PM
