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Air to Air Heat Exchanger with DX Coil Unit
Installation Manual
Air to Air Heat Exchanger with DX Coil Unit
Installation Manual
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 ground wires to gas pipes, water pipes, lightning rods or ground 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 220–240V 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 control 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
VNK502HEXE
VN502HEXE
VNK802HEXE
VN802HEXE
I-phase 50Hz 220-240V
I-phase 60Hz 220V
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
VNK1002HEXE
VN1002HEXE
I-phase 50Hz 220-240V
VNK1002HEXE2
VN1002HEXE2
I-phase 60Hz 220V
(*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
On the outside of the unit, do not allow the wire for the remote controller (communication wire) and the wire for
AC220-240V to come into contact or put them together in one electrical conduit; otherwise, the control system may
have trouble due to noise.
Item
Model name
MMD-
Communication line
Indoor/Outdoor inter-unit wiring (*2) (2
cables)
Central control line wiring (*3) (2 cables)
Remote controller wiring (*4)
Air to Air Heat
Exchanger with
DX Coil Unit
VNK502HEXE
VN502HEXE
VNK802HEXE
VN802HEXE
(Up to 1000m)
2-core, non-polarity shield wire: 1.25 mm
2
(Up to 2000m)
2-core, non-polarity shield wire: 2.00 mm
2
2-core, non-polarity: 0.5 to 2.0 mm
2
VNK1002HEXE
VN1002HEXE
VNK1002HEXE2
VN1002HEXE2
(*2) (*3)
• 2-core with non-polarity wires are used for the Indoor/ Outdoor inter-unit wiring and Central controller wiring.
• To prevent noise trouble, use 2-core shield wire.
• The length of the communication line means the total length of the inter-unit wire length between indoor and outdoor units added with the
central control system wire length.
(*4)
• 2-core with non-polarity wire is used for wiring of the remote controller wiring and group remote controllers wiring.
Remote controller wiring, remote controller inter-unit wiring
2-core, non-polarity: 0.5mm
2
to 2.0mm
2
Total wire length of remote controller wiring and remote
controller inter-unit wiring = L + L1 + L2 + ··· Ln
For wired type only
Up to 500mm
When wireless type is included
Up to 400mm
Total wire length of remote controller inter-unit wiring = L1 + L2 + ··· Ln
Up to 200mm
L
L1
L2
Ln
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Remote
controller
Remote controller
wiring
Remote controller inter-unit wiring
(Up to 8 units)
21-EN
22-EN
